Equalization domain selection at wireless device

Abstract

This disclosure provides systems, methods, and apparatus, including computer programs encoded on a computer storage medium, for equalization domain selection at a wireless device. A wireless device may be configured to support a selection between time domain equalization and frequency domain equalization to receive an RF signal, which may be performed in accordance with a detected channel condition. For example, if a wireless device detects a condition associated with a relatively dispersed channel, the wireless device may select a frequency domain equalization, and if the wireless device detects a condition associated with a relatively flat channel, the wireless device may select a time domain equalization. In some implementations, performing time domain equalization may include changing a sampling rate to a symbol rate, such as performing resampling using a Farrow resampler. Such techniques may include a wireless device selecting an equalization scheme associated with a relatively minimum power consumption for a detected channel condition.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. patent application No. 17 / 894,025, entitled “EQUALIZATION DOMAIN SELECTION AT A WIRELESS DEVICE,” filed by Horn et al. on August 23, 2022, which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The present disclosure relates to wireless communications, including equalization domain selection at a wireless device. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (such as time, frequency and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may use techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA) or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM). A wireless multiple access communication system may include one or more base stations (BS) or one or more network access nodes, each base station or network access node simultaneously supporting communication for multiple communication devices, which may be further referred to as user equipment (UE). Summary of the invention

[0005] The systems, methods and devices of the present disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.

[0006] One innovative aspect of the subject matter described in the present disclosure may be implemented in a method for wireless communication. The method may include: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; using the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; obtaining a set of time domain data samples according to the channel of the radio frequency spectrum band; and outputting a set of modulation symbols according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0007] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus may include: one or more interfaces; and a processing system. The one or more interfaces may be configured to obtain an indication of a channel condition of a channel of a radio frequency spectrum band. The processing system may be configured to use the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme. The one or more interfaces may be configured to: obtain a set of time domain data samples based on the channel of the radio frequency spectrum band; and output a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0008] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus may include: a processor; a memory coupled to the processor; and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: obtain an indication of a channel condition of a channel of a radio frequency spectrum band; use the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; obtain a set of time domain data samples according to the channel of the radio frequency spectrum band; and output a set of modulation symbols according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0009] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus may include: a component for obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; a component for selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band; a component for obtaining a set of time domain data samples according to the channel of the radio frequency spectrum band; and a component for outputting a set of modulation symbols according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0010] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions that can be executed by a processor to: obtain an indication of a channel condition of a channel of a radio frequency spectrum band; use the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; obtain a set of time domain data samples based on the channel of the radio frequency spectrum band; and output a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0011] Some specific implementations of the methods, devices, and non-transitory computer-readable media described herein may include operations, features, components, or instructions for: in response to selecting the time domain equalization scheme, resampling the set of time domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled set of time domain data samples; and executing the time domain equalization scheme using the resampled set of time domain data samples to obtain an equalized set of time domain data samples.

[0012] Some specific implementations of the methods, apparatus, and non-transitory computer-readable media described herein may include operations, features, components, or instructions for: in response to selecting the time-domain equalization scheme, performing the time-domain equalization scheme using the set of time-domain data samples to obtain an equalized set of time-domain data samples.

[0013] Some specific implementations of the methods, apparatus, and non-transitory computer-readable media described herein may include operations, features, components, or instructions for: in response to selecting the frequency domain equalization scheme, performing a Fourier transform on the time domain data sample set to obtain a frequency domain data sample set; and performing the frequency domain equalization scheme using the frequency domain data sample set to obtain an equalized frequency domain data sample set.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may include operations, features, components, or instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme based on power associated with the time domain equalization scheme corresponding to the channel condition and power associated with the frequency domain equalization scheme corresponding to the channel condition.

[0015] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may include operations, features, components, or instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme based on a delay spread associated with the channel condition.

[0016] The details of one or more specific implementations of the subject matter described in the present disclosure are set forth in the accompanying drawings and the following description. Other features, aspects, and advantages will become apparent from the description, drawings, and claims. It should be noted that the relative dimensions in the drawings may not be drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An example of a wireless communication system that supports equalization domain selection at a wireless device is shown.

[0018] Figure 2 An example of a signaling diagram supporting equalization domain selection at a wireless device is shown.

[0019] Figure 3An example of a process flow to support equalization domain selection at a wireless device is shown.

[0020] Figure 4 A diagram of a system including a UE supporting equalization domain selection at a wireless device is shown.

[0021] Figure 5 A diagram of a system including a network entity that supports equalization domain selection at a wireless device is shown.

[0022] Figure 6 A flow chart illustrating a method of supporting equalization domain selection at a wireless device is shown.

[0023] Like reference numbers and designations in the various drawings indicate like elements. DETAILED DESCRIPTION

[0024] For the purpose of describing the innovative aspects of the present disclosure, the following description refers to some specific implementations. However, one of ordinary skill in the art will readily recognize that the teachings herein can be applied in a variety of different ways. The described specific implementations can be implemented in any device, system, or network capable of sending and receiving radio frequency (RF) signals in accordance with any one of the Institute of Electrical and Electronics Engineers (IEEE) 16.11 standards or any one of the following: IEEE 802.11 standards, Standard, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Global System for Mobile Communications (GSM), GSM or General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband-CDMA (W-CDMA), Evolution-Data Optimized (EV-DO), 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed ​​Packet Access (HSPA), High Speed ​​Downlink Packet Access (HSDPA), High Speed ​​Uplink Packet Access (HSUPA), Evolved High Speed ​​Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or other known signals for communicating within a wireless, cellular or Internet of Things (IOT) network, such as a system utilizing third generation (3G) technology, fourth generation (4G) technology, fifth generation (5G) or sixth generation (6G) technology, or another specific implementation thereof.

[0025] Wireless communications between wireless devices may involve various sources of power consumption, including signal processing at a transmitting device, RF signal transmission at a transmitting device, RF signal reception at a receiving device, and signal processing at a receiving device. In some implementations, power consumption at a mobile wireless device, such as a user equipment (UE), may be associated with tradeoffs involving limited power supplies, such as power supplied from a battery of the mobile wireless device. As bandwidth increases, including frequency ranges such as FR4 or FR5, or frequency ranges associated with 6G, challenges associated with power consumption at wireless devices may be relatively prominent, as supporting higher bandwidth signals and higher data rates may be associated with increased power consumption.

[0026] In relatively high frequency ranges, such as those associated with the sub-terahertz (THz) band, antenna size may be relatively small, which may support implementing a greater number of antenna elements in an antenna array, such as for a given array size. In some implementations, increasing the number of antenna elements may support relatively higher antenna gain or narrower beams and other signaling characteristics. The combination of a relatively small beamwidth and a relatively high path loss, such as a path loss according to Friis's formula, may reduce the degree of beam scattering, such as dispersion, which may support an RF channel with a nearly flat frequency domain response. Such characteristics may support the use of relatively power efficient waveforms, such as single carrier (SC) waveforms, discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms, or CDMA waveforms, and other such waveforms, which may be more attractive than orthogonal frequency division multiplexing (OFDM) waveforms in some scenarios, such as scenarios where the channel has a relatively flat frequency response, for which some techniques for OFDM waveforms may be associated with relatively high complexity, relatively high processing load, relatively high power consumption, or both.

[0027] In order to take advantage of such signaling characteristics, SC waveforms and DFT-s-OFDM waveforms may be suitable for implementation in relatively high frequency bands (such as frequencies associated with FR2x bands and higher frequencies). In some specific implementations, processing of the DFT-s-OFDM waveform at the receiving device may involve equalization in the frequency domain, and processing of the SC waveform at the receiving device may involve equalization in the time domain. For relatively dispersed channel conditions (including channels associated with relatively high delay spread), frequency domain equalization of the DFT-s-OFDM waveform may support relatively higher performance and efficiency than time domain equalization of the SC waveform. However, for relatively flat channel conditions (including channels associated with relatively low delay spread), time domain equalization of the SC waveform may support performance similar to frequency domain equalization of the DFT-s-OFDM waveform, but with lower complexity and lower power consumption.

[0028] In some implementations, the wireless device may be configured to support a selection between time domain equalization and frequency domain equalization to receive RF signals, which may be performed based on detected channel conditions (such as channel conditions detected by the wireless device or otherwise indicated to the wireless device). For example, if the wireless device detects conditions associated with a relatively dispersed channel (such as for a channel associated with a relatively high delay spread), the wireless device may select frequency domain equalization to support relatively high signaling performance, which may involve performing Fourier transform operations, such as discrete Fourier transform (DFT) operations, fast Fourier transform (FFT) operations, inverse discrete Fourier transform (IDFT) operations, or inverse Fourier transform (IFFT) operations, or various combinations thereof. In some implementations, performing frequency domain equalization for a relatively dispersed channel may be associated with lower power consumption than performing time domain equalization for a relatively dispersed channel. If the wireless device detects conditions associated with a relatively flat channel (such as for a channel associated with a relatively high delay spread), the wireless device may select time domain equalization to support relatively low processing complexity, where the signaling performance may be the same or similar to frequency domain equalization. In some implementations, performing time domain equalization may include changing the sampling rate to a symbol rate (such as resampling using a Farrow resampler), which may be performed without involving one or more Fourier transform operations, each of which may be associated with a relatively high computational cost. Thus, in some cases, performing time domain equalization for a relatively flat channel may involve lower power consumption than performing frequency domain equalization for a relatively flat channel.

[0029] Specific implementations of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential advantages. For example, by supporting selection between equalization techniques based on detected channel conditions, a wireless device may be able to select an equalization technique associated with lower power consumption for channel conditions associated with the wireless device. In addition, by implementing such techniques, some waveforms (such as DFT-s-OFDM waveforms) may support signaling that is relatively power efficient (such as compared to OFDM and SC waveforms) for both dispersed channels and flat channels at a receiving device. Therefore, such techniques may address certain power consumption deficiencies associated with DFT-s-OFDM signaling while maintaining other advantageous characteristics of DFT-s-OFDM signaling. Such characteristics may be relevant to mobile wireless devices (such as UEs), including wireless devices that receive signaling (such as signaling from a network entity or another UE) on a downlink channel or a sidelink channel, for improving efficiency or extending operating duration while using a limited power supply (such as a battery).

[0030] Figure 1An example of a wireless communication system 100 that supports equalization domain selection at a wireless device is shown. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some implementations, the wireless communication system 100 may be an LTE network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating according to other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0031] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, wireless devices, or network equipment, among other nomenclature. In some implementations, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125, such as radio frequency (RF) access links. For example, the network entity 105 may support a coverage area 110, such as a geographic coverage area, over which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area in which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0032] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile or stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0033] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (such as any network entity described herein), a UE 115 (such as any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0034] In some implementations, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (such as according to S1, N2, N3, or other interface protocols). In some implementations, the network entities 105 may communicate with each other via the backhaul communication links 120 (such as according to X2, Xn, or another interface protocol) directly (such as directly between the network entities 105) or indirectly (such as via the core network 130). In some implementations, the network entities 105 may communicate with each other via the midhaul communication links 162 (such as according to the midhaul interface protocol) or the fronthaul communication links 168 (such as according to the fronthaul interface protocol), or any combination thereof. The backhaul communication links 120, the midhaul communication links 162, or the fronthaul communication links 168 may be or include one or more wired links (such as electrical links, optical fiber links), one or more wireless links (such as radio links, wireless optical links), etc., or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0035] One or more of the network entities 105 described herein may include or may be referred to as a base station (BS) 140 (such as a transceiver base station, a radio BS, an NR BS, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a giga Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a home Node B, a home evolved Node B, or other suitable terms). In some specific implementations, the network entity 105 (such as BS 140) may be implemented in an aggregated (such as a monolithic, standalone) BS architecture, which may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (such as a single RAN node, such as BS 140).

[0036] In some implementations, the network entity 105 may be implemented in a disaggregated architecture, such as a disaggregated BS architecture, a disaggregated RAN architecture, which may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) such as a network configuration sponsored by the O-RAN Alliance, or a virtualized RAN (vRAN) such as a cloud RAN (C-RAN). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 such as a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (such as separate physical locations). In some implementations, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (such as virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0037] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functionalities, depending on which functions (such as network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, and RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165, such that CU 160 may support one or more layers of a protocol stack, and DU 165 may support one or more different layers of a protocol stack. In some implementations, CU 160 may host higher protocol layer (such as layer 3 (L3), layer 2 (L2)) functionality and signaling (such as radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (such as a physical (PHY) layer) or L2 (such as a radio link control (RLC) layer, a medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (such as via one or more RUs 170). In some implementations, the functional split between the CU 160 and the DU 165 or between the DU 165 and the RU 170 may be within the protocol layer (such as some functions of the protocol layer may be performed by one of the CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, DU 165, or RU 170). The CU 160 may be further functionally split into CU control plane (CU-CP) and CU user plane (CU-UP) functions. The CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (such as F1, F1-c, F1-u), and the DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (such as an open fronthaul (FH) interface). In some implementations, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented based on an interface (such as a channel) between layers of a protocol stack supported by respective network entities 105 that communicate via such communication links.

[0038] In some wireless communication systems (such as wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (such as to core network 130). In some specific implementations, in an IAB network, one or more network entities 105 (such as IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a donor network entity 105 (such as donor BS 140). One or more donor network entities 105 (such as IAB donors) may communicate with one or more additional network entities 105 (such as IAB nodes 104) via supported access and backhaul links (such as backhaul communication links 120). IAB nodes 104 may include IAB mobile terminations (IAB-MTs) controlled (such as scheduling) by DUs 165 of coupled IAB donors. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (such as RU 170) for access via the DU 165 of the IAB node 104 (such as referred to as a virtual IAB-MT (vIAB-MT)). In some implementations, the IAB node 104 may include a DU 165 that supports communication links with additional entities (such as IAB nodes 104, UE 115) within a relay chain or configuration (such as downstream) of the access network. In such implementations, one or more components of the decomposed RAN architecture (such as one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0039] In a specific implementation in which the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support equalization domain selection at a wireless device as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (such as a BS 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (such as an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0040] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a user device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some specific implementations, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0041] like Figure 1 As shown, the UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as network entities 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay BSs, etc.

[0042] The UE 115 and the network entity 105 may use resources associated with one or more carriers to communicate wirelessly with each other via one or more communication links 125 (such as access links). The term "carrier" may refer to a collection of RF spectrum resources having a physical layer structure defined to support the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (such as a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (such as LTE, LTE-A, LTE-APro, NR). Each physical layer channel may carry acquisition signaling (such as synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any part (such as an entity, a sub-entity) of the network entity 105. For example, the terms "send", "receive" or "communicate" when referring to the network entity 105 may refer to any part of the network entity 105 (such as BS 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (such as directly or via one or more other network entities 105).

[0043] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (such as forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (such as return link transmissions) from the UE 115 to the network entity 105, or both, as well as other transmission configurations. A carrier may carry downlink or uplink communications (such as in an FDD mode) or may be configured to carry downlink and uplink communications (such as in a TDD mode).

[0044] The signal waveform transmitted via the carrier wave may be composed of multiple subcarriers (such as using multi-carrier modulation (MCM) techniques such as OFDM or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may refer to a symbol period (such as the duration of a modulation symbol) and a resource of a subcarrier, where the symbol period and the subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (such as the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that a relatively higher number of resource elements (such as in the transmission duration) and a relatively higher order modulation scheme may correspond to a relatively higher communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (such as spatial layers or beams), and the use of multiple spatial resources may improve the data rate or data integrity of communications with UE 115.

[0045] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit. In some implementations, the basic time unit may refer to a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the supported subcarrier spacing, and N f The supported DFT size may be indicated. The time intervals of the communication resources may be organized according to radio frames each having a specific duration, such as 10 milliseconds (ms). Each radio frame may be identified by a system frame number (SFN), such as ranging from 0 to 1023.

[0046] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some specific implementations, the frame may be divided into subframes (such as in the time domain), and each subframe may be further divided into a certain number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a certain number of symbol periods (for example, this depends on the length of the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, the time slot may be further divided into a plurality of mini-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (such as N) time slots. f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0047] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (such as in the time domain) of the wireless communication system 100, and may be referred to as a transmission time interval (TTI). In some implementations, the TTI duration (such as the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (such as in bursts of shortened TTIs (sTTIs)).

[0048] According to various techniques, physical channels may be multiplexed using carriers for communication. Physical control channels and physical data channels may be multiplexed for signaling via downlink carriers, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region for a physical control channel, such as a control resource set (CORESET), may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions, such as CORESETs, may be configured for a set of UEs 115. For example, one or more UEs in UE115 may monitor or search a control region to obtain control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the number of control channel resources, such as control channel elements (CCEs), associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0049] In some implementations, the network entities 105 (such as BS 140, RU 170) can be mobile and thus provide communication coverage for mobile coverage areas 110. In some implementations, different coverage areas 110 associated with different technologies can overlap, but different coverage areas 110 can be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies can be supported by different network entities 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of network entities 105 use the same or different radio access technologies to provide coverage for various coverage areas 110.

[0050] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms "ultra-reliable", "low latency", and "ultra-reliable low latency" are used interchangeably herein.

[0051] In some implementations, a UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (such as according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some implementations, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (such as a BS 140, RU 170), which may support aspects of such D2D communication configured (such as scheduling) by the network entity 105. In some implementations, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some implementations, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some implementations, the network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving the network entity 105.

[0052] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (such as a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (such as a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access layer (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a network entity 105 (such as BS 140) associated with the core network 130. User IP packets may be delivered through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0053] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength ranges from about one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (such as less than 100 kilometers) compared to communications using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0054] The wireless communication system 100 may utilize licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may use unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ License Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology. When operating using unlicensed RF spectrum bands, devices such as the network entity 105 and the UE 115 may employ carrier sensing for conflict detection and avoidance. In some specific implementations, operations using unlicensed bands may be based on a carrier aggregation configuration combined with component carriers operating using licensed bands (such as LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0055] The network entity 105 (such as BS140, RU 170) or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which can support MIMO operations or transmit or receive beamforming. For example, one or more BS antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some specific implementations, the antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a collection of antenna ports of multiple rows and columns that the network entity 105 can use to support beamforming for communication with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0056] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (such as a network entity 105, a UE 115) to shape or direct an antenna beam (such as a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals conveyed via antenna elements of an antenna array so that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals conveyed via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (such as relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0057] The wireless communication system 100 may be configured to utilize relatively power efficient waveforms, such as SC waveforms, DFT-s-OFDM waveforms, or CDMA waveforms, among others. In some implementations, processing of a DFT-s-OFDM waveform at a receiving device may involve equalization in the frequency domain, and processing of an SC waveform at a receiving device may involve equalization in the time domain. For relatively dispersed channel conditions (including channels associated with relatively high delay spread), frequency domain equalization of a DFT-s-OFDM waveform may support relatively higher performance and efficiency than time domain equalization of an SC waveform. However, for relatively flat channel conditions (including channels associated with relatively low delay spread), time domain equalization of an SC waveform may support similar performance to frequency domain equalization of a DFT-s-OFDM waveform, but with lower complexity and lower power consumption.

[0058] According to examples as disclosed herein, a wireless device (such as a UE 115 or a network entity 105) of a wireless communication system 100 may be configured to support a selection between time domain equalization and frequency domain equalization to receive an RF signal, which may support a selection of an equalization technique associated with relatively low processing complexity or relatively low power consumption for a given channel condition. For example, if the wireless device detects a condition associated with a relatively dispersed channel (such as for a channel associated with a relatively high delay spread), the wireless device may select frequency domain equalization to support relatively high signaling performance, which may involve performing a Fourier transform operation, such as a DFT operation, an FFT operation, an IDFT operation, or an IFFT operation, or various combinations thereof. In some cases, performing frequency domain equalization for a relatively dispersed channel may be associated with lower power consumption than performing time domain equalization for a relatively dispersed channel. If the wireless device detects a condition associated with a relatively flat channel (such as for a channel associated with a relatively high delay spread), the wireless device may select time domain equalization to support relatively low processing complexity, where the signaling performance may be the same or similar to frequency domain equalization. In some implementations, performing time domain equalization may include changing the sampling rate to a symbol rate (such as resampling using a Farrow resampler), which may be performed without performing one or more Fourier transform operations, each of which may be associated with a relatively high computational cost. Thus, in some cases, performing time domain equalization for a relatively flat channel may involve lower power consumption than performing frequency domain equalization for a relatively flat channel.

[0059] Figure 2 An example of a signaling diagram 200 supporting equalization domain selection at a wireless device is shown. Signaling diagram 200 includes wireless device 205 (a device performing transmission) and wireless device 210 (a device performing reception). Aspects of signaling diagram 200 may be described with reference to transmission 215 sent by wireless device 205.

[0060] The signaling diagram 200 may be associated with various types of wireless devices and various types of signaling. For implementations where the wireless device 205 is the network entity 105 and the wireless device 210 is the UE 115, the transmission 215 may be performed according to a downlink channel. For implementations where the wireless device 205 is the UE 115 and the wireless device 210 is the UE 115, the transmission 215 may be performed according to a sidelink channel. For implementations where the wireless device 205 is the UE 115 and the wireless device 210 is the network entity 105, the transmission 215 may be performed according to an uplink channel. In various implementations, the transmission 215 may be a unicast transmission, a multicast transmission, or a broadcast transmission, among other types of transmissions. In some implementations, the transmission 215 may be transmitted according to a DFT-s-OFDM waveform, in which case the wireless device 205 may perform modulation according to a DFT-s-OFDM technique to support the generation of the transmission 215. However, other types of modulation schemes for the transmission 215 may be used to implement the described techniques.

[0061] The transmission 215 may be received by the wireless device 210 according to various channel conditions, wherein the channel between the wireless device 205 and the wireless device may be associated with signal propagation conditions between the wireless device 205 and the wireless device 210, such as the signal propagation conditions subject to the transmission 215. In some implementations, the received signal y(t) at the receiving device may be given by:

[0062] y(t)=h*s(t)+n (1)

[0063] Where h may represent a channel between a transmitting device and a receiving device, s(t) may represent a transmission by the transmitting device, and n may represent an addition of signal noise that may be superimposed on the transmitted signal as received at the receiving device. In some implementations, h may be a matrix or other transfer function that represents how a signal may be modified along a propagation path between the transmitting device and the receiving device.

[0064] In some implementations, channel conditions (such as h in Equation 1) can be estimated by the wireless device 205, the wireless device 210, or both, which can support various signaling techniques by the wireless device 205 or the wireless device 210. For example, the wireless device 205 can transmit one or more signals 220 (such as a pilot signal, a reference signal, a demodulation reference signal (DMRS), a synchronization signal block (SSB), a tracking reference signal (TRS), or a channel state estimation reference signal (CSI-RS)), and the wireless device 210 can measure the signals 220 to support the wireless device 210 in estimating the channel conditions between the wireless device 205 and the wireless device 210. Using the estimate of the channel conditions between the wireless device 205 and the wireless device 210, the wireless device 210 can perform equalization operations to remove the estimated channel conditions from the measurement of the transmission 215, which can improve the fidelity of receiving the transmission 215 relative to the transmission of the transmission 215 by the wireless device 205. Therefore, by implementing various techniques for channel estimation and equalization, the wireless device 210 can improve the likelihood of successfully receiving the transmission 215.

[0065] Signal propagation conditions between wireless device 205 and wireless device 210 can be associated with different degrees of dispersion, which can be associated with the energy and other characteristics of the transmitted signal arriving at the receiving device at different times (such as different arrival times) or over a time span. For example, the transmitted signal can arrive at the receiving device through different signal propagation paths or via different signal reflections, which can be associated with different path lengths. In some implementations, different degrees of dispersion can be compensated in the equalization operation, but depending on the degree of dispersion, relatively higher or lower complexity may be involved.

[0066] Signaling diagram 200 illustrates a time domain graph 240 and a frequency domain graph 250 showing aspects of a dispersive channel, such as a dispersive channel h, which may be imposed on a transmission 215 (such as according to the relationship of Equation 1) as observed at a wireless device 210 in some scenarios. For example, time domain graph 240 may illustrate channel h having time domain components h1(t)-hn(t) (such as n "clusters"), illustrating delay spread 245. Delay spread 245 illustrates how a transmission 215 is received at different received powers at different times after the transmission (which may be associated with inter-symbol interference of the transmission 215) and signaling degradation at the wireless device 210. The associated frequency domain graph 250 illustrates the effects of a dispersive channel as a graph of power versus frequency, which illustrates a non-flat frequency response associated with a dispersive channel.

[0067] To support time domain equalization in response to dispersive channels, the wireless device 210 may implement a relatively large number of filter points (such as filter taps), which may involve relatively high processing complexity and power consumption to support the channel cancellation involved. For frequency domain equalization that may be supported by DFT-s-OFDM waveforms and other signaling techniques involving signal 220 (such as DMRS), the wireless device 210 may have the same or similar processing complexity and power consumption regardless of delay spread, which may involve frequency domain filters, time domain interpolation, frequency domain interpolation, and mean square error estimation, such as linear minimum mean square error (LMMSE) equalization according to:

[0068]

[0069] in can be a set of equalized frequency domain data samples, H can be an estimated channel frequency response, R nn may be the estimated noise covariance matrix, and y may be the frequency domain input symbol.

[0070] The signaling diagram 200 also illustrates a time domain graph 260 and a frequency domain graph 270 showing aspects of a flat channel, such as a flat channel h, which may be imposed on the transmission 215 as observed at the wireless device 210 in some other scenarios. For example, the time domain graph 260 may illustrate the channel h having a single time domain component h1(t), illustrating the absence of delay spread. The associated frequency domain graph 270 illustrates the effect of a flat channel as a graph of power versus frequency, showing a flat frequency domain response associated with the channel. To support time domain equalization in response to a flat channel, the wireless device 210 may implement a relatively small number of filter points, which may involve relatively low processing complexity and relatively low power consumption. In some implementations, to support time domain equalization in response to a flat channel, the wireless device 210 may omit one or more aspects of frequency domain interpolation, such as one or more Fourier transform operations, which may be associated with lower processor complexity or lower power consumption. Furthermore, in some implementations, filtering for time domain equalization can be performed without using measurements of signal 220 .

[0071] According to examples as disclosed herein, the wireless device 210 may be configured to support a selection between time domain equalization and frequency domain equalization to receive a signal associated with the transmission 215, which may be performed based on detected channel conditions associated with a dispersed channel (such as the conditions shown in graphs 240 and 250) or a flat channel (such as the conditions shown in graphs 260 and 270) and other channel characteristics. For example, if a relatively dispersed channel is detected, the wireless device 210 may select frequency domain equalization to support relatively high signaling performance (such as increased fidelity for eliminating aspects of the dispersed channel (such as delay spread)), which is associated with lower power consumption than time domain equalization for a relatively dispersed channel. If a relatively flat channel is detected, the wireless device 210 may select time domain equalization to support relatively low processing complexity, which may include changing the sampling rate to the symbol rate (such as using a resampler (such as a Farrow resampler)) and omitting at least some operations associated with frequency domain equalization. Thus, in some cases, performing time domain equalization for a relatively flat channel may involve lower power consumption by the wireless device 210 receiving the transmission 215 compared to frequency domain equalization for a relatively flat channel. Thus, techniques according to examples as disclosed herein may enable the wireless device 210 to select an equalization scheme with relatively lower power consumption, which may improve the efficiency of the wireless device 210 and may extend the operation duration of the wireless device 210 for conditions where the wireless device 210 is operating with a limited power supply.

[0072] Figure 3 An example of a process flow 300 for supporting equalization domain selection at a wireless device is shown. In some implementations, the operations of the process flow 300 may be performed by reference to Figure 2 The wireless device 210 described above may be performed, such as a wireless device associated with receiving that performs the transmission 215.

[0073] At 310, the wireless device may perform one or more channel estimation operations. For example, the wireless device may obtain an indication of a channel condition (such as a channel response) of a channel of a radio frequency spectrum band. In some implementations, the wireless device may obtain samples 305 (such as a pilot signal measurement set, an input preamble, one or more samples of signal 220, a sample set {p1, p2, ..., p NDMRS}, where N DMRSThe sample 305 may be associated with the number of DMRS or other pilot transmissions in the sampling interval) and use the sample 305 to obtain an indication of the channel condition. In some implementations, the sample 305 may be a measurement sequence in the frequency domain (such as samples associated with one or more subcarriers), which may be sent in the same symbol duration. In some implementations, the sample 305 may be associated with the wireless device's measurement of a signal preamble, a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH) DMRS, SSB, TRS, CSI-RS, and other signals or combinations of signals.

[0074] In some implementations, the channel estimation operation at 310 may include determining a delay spread of the channel. For example, the delay spread may consider all clusters h (such as the clusters associated with each of h1(t), h2(t), etc.) to evaluate a “centroid” associated with the channel h(t). The delay spread σ is calculated τ An example is given below:

[0075]

[0076] where the value associated with τ is given by:

[0077]

[0078] And among them a i is the amplitude of each cluster and τ is the delay.

[0079] At 315, the wireless device may perform one or more equalization scheme selection operations. For example, the wireless device may use the indication of the channel condition determined at 310 to select between a time domain equalization scheme and a frequency domain equalization scheme, which may involve selecting the equalization scheme associated with the lowest power consumption.

[0080] In some specific implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme may be performed based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition. For example, the selection in 315 may include: if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, then the time domain equalization scheme is selected; or if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, then the frequency domain equalization scheme is selected.

[0081] In some implementations, the wireless device may determine power consumption of various parts of the candidate equalization schemes. For example, the selection at 315 may involve determining the power consumed by a resampling operation (such as for time domain equalization), such as the power consumption of a Farrow resampler or other resampler (such as a resampling filter), which may be available in the digital front end of the wireless device without additional power consumption. Additionally or alternatively, the selection at 315 may involve determining the power consumed by the time domain equalizer itself, such as a filter or decision feedback error. In some implementations, the number of samples to be equalized may depend on the size of the allocation rather than the size of the FFT, in which case smaller allocations may consume less power. In some implementations, the power consumption associated with the time domain equalization operation may be based on a measurement or on the number of filter taps involved in equalizing the channel, which number may be approximated based on the number of points in the FFT and the number of filter taps (such as with the power n FFT *N filterTaps Additionally or alternatively, the selection at 315 may involve determining the power consumed by the FFT operation, the DFT operation, and the frequency domain equalization itself. For example, the power consumption of the FFT operation and the DFT operation may be based on measurements (such as measurements of sample 305) or based on a complexity analysis, which may also be based on the number of points in the FFT and the number of filter taps (such as with n FFT *log(n FFT In some implementations, the power consumption associated with frequency domain equalization can be based on the number of points in the FFT (such as n FFT According to these and other examples, the wireless device can compare the power consumed by each method and select the balancing scheme associated with the lowest power consumption.

[0082] In some implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme can be based on the delay spread associated with the channel conditions (such as the delay spread σ τ ). For example, the wireless device may obtain an estimate of the delay spread, and the selection at 315 may include selecting a time domain equalization scheme if the delay spread is below a threshold delay spread, or selecting a frequency domain equalization scheme if the delay spread is above a threshold delay spread. In some implementations, the threshold delay spread may be obtained from a lookup table (such as a lookup table that takes into account detected Doppler spread, noise conditions, or movement of the wireless device, or any combination thereof) and other criteria, or may be obtained through machine learning and other techniques at the wireless device. In some implementations, obtaining the delay spread threshold (such as using a lookup table) may take into account the allocated peak-to-peak channel power as follows:

[0083]

[0084] in is the channel frequency response. Additionally or alternatively, in some implementations, obtaining the delay spread threshold (such as using a lookup table) may take into account the frequency variance of the channel as follows:

[0085]

[0086] The selection between the equalization schemes at 315 may be performed between one or more options of time domain equalization schemes and one or more options of frequency domain equalization schemes. For example, process flow 300 illustrates an example of two time domain equalization techniques (labeled as option “A” (first time domain equalization scheme) and option “B” (second time domain equalization scheme)) and one frequency equalization technique (labeled as option “C”), where option “A” and option “B” may differ based at least in part on whether resampling is performed before or after time domain equalization. In some implementations, if the channel is determined to be flat, the wireless device may select one of option A or B, and if the channel is determined to be non-flat, the wireless device may select option C. In some implementations, the wireless device may be configured to support both option A and option B, and the selection between option A and option B may be performed based on the channel conditions determined at 305 and other criteria. In some other implementations, the wireless device may be configured to support option A or option B, where the configured option is performed in response to the selection of the time domain equalization scheme. Thus, in the context of the example of process flow 300, the selection at 315 may be performed between options A, B, and C, or between options A and C, or between options B and C. However, other implementations may involve selecting between a different number of options for time domain equalization schemes and frequency domain equalization schemes.

[0087] To support demodulation of a signal received on a channel of a radio frequency band, the wireless device may obtain samples 320 (such as a set of time domain data samples, samples of transmission 215, a set of samples {x1, x2, ..., x NFFT}, where the NFFT may be associated with a number of samples in a sampling interval, which may be greater than the number of modulation symbols represented by the samples 320). In some implementations, the samples 320 may be associated with a DFT-s-OFDM modulation scheme (such as modulated according to or otherwise output according to a DFT-s-OFDM modulation scheme). In various implementations, the samples 320 may be obtained from a downlink channel, or a sidelink channel, or an uplink channel. The process flow 300 illustrates an example for outputting a set of modulation symbols based on the samples 320 using a time domain equalization scheme or a frequency domain equalization scheme selected at 315.

[0088] In some cases, at 325, the wireless device may perform one or more resampling operations. For example, in response to selecting a first time-domain equalization scheme (such as selecting option A), the wireless device may resample samples 320 at 325 to obtain samples 330 (such as a resampled set of time-domain data samples, a set of samples {x1, x2, ..., x N_DFT}, where N_DFT may be equal to the number of modulation symbols represented by sample 320). In some implementations, the resampling of 325 may be performed according to the OFDM symbol rate. In some implementations, to resample sample 320, the wireless device may input sample 320 into a resampler (such as a resampling filter) to obtain sample 330. In some implementations, to convert samples from one rate to another, the resampler may involve one or more interpolation techniques, such as linear interpolation, polynomial interpolation, logarithmic interpolation, and other techniques for interpolation, or a combination thereof. In some implementations, such resampling techniques may also implement one or more filters, such as an input filter, an output filter, or a combination thereof. In some implementations, the resampling technique may be selected or otherwise configured to support operation of 325 with relatively low processing complexity, relatively low power consumption, or both. In some implementations, to resample sample 320, the wireless device may input sample 320 into a Farrow resampler.

[0089] At 335, the wireless device may perform one or more time domain equalization operations. For example, the wireless device may use samples 330 to perform a time domain equalization scheme to obtain samples 340-a (such as an equalized set of time domain samples, an equalized resampled set of time domain samples, a set of samples ). In some implementations, the time domain equalization of 345 may be performed based on a channel estimate associated with sample 305, such as the channel estimate performed at 310. For example, the time domain equalization of 335 may be based on a filter calculated based on the channel estimate of 310, which may be a relatively short filter based on the criteria for selecting option A. For the case where option A is selected, sample 340-a may be provided for demodulation at 390. In some other implementations, one or more of the operations of 325, 335, 390, or any combination thereof may incorporate a deep neural network operation that may perform aspects of demodulation or a demodulation attempt.

[0090] In some cases, at 345, the wireless device may perform one or more time domain equalization operations. For example, in response to selecting the second time domain equalization scheme (such as selecting option B), the wireless device may perform a time domain equalization scheme using samples 320 at 345 to obtain samples 350 (such as an equalized time domain sample set, a sample set ). In some implementations, the time domain equalization of 345 can be performed based on a channel estimate associated with sample 305, such as the channel estimate performed at 310. For example, the time domain equalization of 345 can be based on a filter calculated based on the channel estimate of 310, which can be a relatively short filter based on the criteria for selecting option A.

[0091] At 355, the wireless device may perform one or more resampling operations. For example, the wireless device may resample the samples 350 to obtain samples 340-b (such as a resampled equalized time domain sample set, a resampled equalized time domain sample set, a sample set ). In some implementations, the resampling of 355 may be performed according to the OFDM symbol rate. In some implementations, in order to resample sample 350, the wireless device may input sample 350 into a resampler (such as a resampling filter) to obtain sample 340-b. In some implementations, in order to convert samples from one rate to another rate, this resampler may involve one or more interpolation techniques, such as linear interpolation, polynomial interpolation, logarithmic interpolation, and other techniques for interpolation, or a combination thereof. In some implementations, such resampling techniques may also implement one or more filters, such as an input filter, an output filter, or a combination thereof. In some implementations, the resampling technique may be selected or otherwise configured to support operation of 355 with relatively low processing complexity, relatively low power consumption, or both. In some implementations, in order to resample sample 320, the wireless device may input sample 320 into a Farrow resampler. For the case where option B is selected, sample 340-b may be provided for demodulation of 390.

[0092] In some cases, at 365, the wireless device may perform one or more Fourier transform operations (such as FFT or DFT). For example, in response to selecting a frequency domain equalization scheme (such as selecting option C), the wireless device may perform a Fourier transform on samples 320 at 365 to obtain samples 370 (such as a set of frequency domain data samples, a set of samples {X1, X2, ..., X NFFT}, where the NFFT may be associated with the number of frequency domain samples used for the sampling interval, and the number may be a power of 2).

[0093] At 375, the wireless device may perform one or more frequency domain equalization operations. For example, the wireless device may use samples 370 to perform a frequency domain equalization scheme to obtain samples 380 (such as a set of equalized frequency domain data samples, a set of samples, and a set of samples). Sample Collection ). In some implementations, frequency domain equalization may be performed according to Equation 2.

[0094] At 385, the wireless device may perform one or more inverse Fourier transform operations (such as iDFT or iFFT). For example, the wireless device may perform an inverse Fourier transform on samples 380 to obtain samples 340-c (such as an equalized set of time domain data samples, a set of samples Where N_DFT may be associated with the size of the inverse Fourier transform, such as the number of frequency domain samples for a sampling interval, which may be less than NFFT). For the case where option C is selected, samples 340-c may be provided for demodulation of 390.

[0095] At 390, the wireless device may perform one or more demodulation operations. For example, the wireless device may demodulate the samples 340 to obtain samples 395 (such as a set of modulation symbols, a set of constellation symbols, a set of bits, a bit stream, a set of samples, a set of samples ). In some implementations, the wireless device may use the same demodulation operation to obtain sample 340 from any of sample 395-a (a sample obtained according to the first time domain equalization scheme), sample 340-b (a sample obtained according to the second time domain equalization scheme), or sample 340-c (a sample obtained according to the frequency domain equalization scheme). In some other implementations, the demodulation operation of 390 may be different depending on whether the wireless device obtains sample 340-a, sample 340-b, or sample 340-c.

[0096] Thus, process flow 300 illustrates an example for configuring a wireless device to support selection between time domain equalization and frequency domain equalization to receive signaling associated with samples 320, which may be performed based on the channel conditions detected at 310. For example, if a relatively dispersed channel is detected, the wireless device may select frequency domain equalization, and if a relatively flat channel is detected, the wireless device may select time domain equalization. Such techniques may support the wireless device to select an equalization scheme with relatively lower power consumption, which may improve the efficiency of the wireless device and may extend the operation duration of the wireless device for conditions where the wireless device is operating with a limited power supply.

[0097] Figure 4A diagram of an example of a system 400 including a device 405 supporting equalization domain selection at a wireless device is shown. The device 405 may communicate with one or more network entities (such as one or more components of one or more BSs 140), one or more UEs 115, or any combination thereof (such as wirelessly). The device 405 may include components for two-way voice and data communications, including components for sending communications and receiving communications, such as a communication manager 420, an input / output (I / O) controller 410, a transceiver 415, an antenna 425, a memory 430, code 435, and a processor 440. These components may be in electronic communication or otherwise coupled (such as operatively, communicatively, functionally, electronically, electrically) via one or more buses (such as a bus 445).

[0098] I / O controller 410 can manage input signals and output signals of device 405. I / O controller 410 can also manage peripheral devices that are not integrated into device 405. In some implementations, I / O controller 410 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 410 can utilize an operating system, such as or another known operating system. Additionally or alternatively, I / O controller 410 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some implementations, I / O controller 410 may be implemented as part of a processor or processing system (such as processor 440). In some implementations, a user may interact with device 405 via I / O controller 410 or via hardware components controlled by I / O controller 410.

[0099] In some implementations, the device 405 may include a single antenna 425. However, in some other implementations, the device 405 may have more than one antenna 425, which can concurrently transmit or receive multiple wireless transmissions. The transceiver 415 can communicate bidirectionally via one or more antennas 425, wired or wireless links, as described herein. For example, the transceiver 415 may represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 415 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 425 for transmission, and for demodulating packets received from one or more antennas 425. In some implementations, the transceiver 415 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 425 configured to support various receiving or obtaining operations, or one or more interfaces coupled to one or more antennas 425 configured to support various sending operations or output operations, or a combination thereof. In some implementations, the transceiver 415 may include or be configured to be coupled to one or more processors or memory components that are operable to: perform or support operations based on received or obtained information or signals; or generate information or other signals for transmission or other output, or any combination thereof. In some implementations, the transceiver 415, or the transceiver 415 and one or more antennas 425, or the transceiver 415 and one or more antennas 425 and one or more processors or memory components (such as the processor 440, or the memory 430, or both) may be included in a chip or chip component installed in the device 405.

[0100] The memory 430 may include random access memory (RAM) and read-only memory (ROM). The memory 430 may store computer-readable, computer-executable code 435 including instructions that, when executed by the processor 440, cause the device 405 to perform various functions described herein. The code 435 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some implementations, the code 435 may not be directly executable by the processor 440, but may cause a computer (such as when compiled and executed) to perform the functions described herein. In some implementations, the memory 430 may include, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0101] The processor 440 may include an intelligent hardware device (such as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a central processing unit (CPU), a field-programmable gate array (FPGA), a microcontroller, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some specific implementations, the processor 440 may be configured to operate a memory array using a memory controller. In some specific implementations, the memory controller may be integrated into the processor 440. The processor 440 may be configured to execute computer-readable instructions stored in a memory (such as memory 430) to enable the device 405 to perform various functions (such as functions or tasks that support equalization domain selection at a wireless device). For example, the device 405 or a component of the device 405 may include a processor 440 and a memory 430 coupled to the processor 440, and the processor 440 and the memory 430 are configured to perform various functions described herein. The processor 440 may be an example of a cloud computing platform (such as one or more physical nodes and supporting software such as an operating system, a virtual machine, or a container instance), which may host functions (such as by executing code 435) to perform the functions of the device 405. Processor 440 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 405 (such as in memory 430). In some specific implementations, processor 440 may be a component of a processing system. A processing system may generally refer to a system or a series of machines or components that receive inputs and process these inputs to produce an output set (which may be passed to other systems or components (e.g., device 405)). For example, a processing system of device 405 may refer to a system including various other components or subcomponents of device 405, such as processor 440, or transceiver 415, or communication manager 420, or other components or combinations of components of device 405. A processing system of device 405 may interface with other components of device 405, and may process information (such as input or signals) received from other components or output information to other components. For example, a chip or modem of device 405 may include a processing system and one or more interfaces for outputting information or for obtaining information or both. The one or more interfaces may be implemented as or otherwise include a first interface configured to output information and a second interface configured to obtain information, or the same interface configured to output information and obtain information, as well as other specific implementations. In some specific implementations, the one or more interfaces may refer to an interface between a processing system of a chip or modem and a transmitter, so that the device 405 can send information output from the chip or modem.Additionally or alternatively, in some implementations, the one or more interfaces may refer to an interface between a processing system of a chip or modem and a receiver, so that the device 405 can obtain information or signal input, and the information can be passed to the processing system. Those skilled in the art will readily recognize that the first interface may also obtain information or signal input, and the second interface may also output information or signal output.

[0102] According to the examples disclosed herein, the communication manager 420 may support wireless communications at a wireless device. For example, the communication manager 420 may be configured to or otherwise support components for: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; and selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band. In some specific implementations, the communication manager 420 may be configured to or otherwise support components for obtaining a set of time domain data samples based on the channel of the radio frequency spectrum band. In some specific implementations, the communication manager 420 may be configured to or otherwise support components for outputting a set of modulation symbols based on a set of time domain data samples using a selected time domain equalization scheme or a frequency domain equalization scheme.

[0103] In some implementations, the communication manager 420 may be configured or otherwise support components for resampling the set of time-domain data samples according to the OFDM symbol rate in response to selecting a time-domain equalization scheme to obtain a resampled set of time-domain data samples. In some implementations, the communication manager 420 may be configured or otherwise support components for performing a time-domain equalization scheme using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

[0104] In some implementations, to support resampling of a set of time-domain data samples, the communication manager 420 can be configured or otherwise support components for inputting the set of time-domain data samples into a Farrow resampler.

[0105] In some implementations, the communication manager 420 can be configured or otherwise support components for demodulating the equalized set of time-domain data samples to obtain a set of modulation symbols.

[0106] In some implementations, the communication manager 420 can be configured or otherwise support components for performing a time-domain equalization scheme using the set of time-domain data samples to obtain an equalized set of time-domain data samples in response to selecting the time-domain equalization scheme.

[0107] In some implementations, the communication manager 420 can be configured or otherwise support means for resampling the equalized set of time-domain data samples according to the OFDM symbol rate to obtain a resampled equalized set of time-domain data samples. In some implementations, the communication manager 420 can be configured or otherwise support means for demodulating the resampled equalized set of time-domain data samples to obtain a set of modulation symbols.

[0108] In some implementations, to support resampling of the equalized set of time-domain data samples, the communication manager 420 can be configured or otherwise support components for inputting the equalized set of time-domain data samples into a Farrow resampler.

[0109] In some implementations, the communication manager 420 may be configured or otherwise support components for performing a Fourier transform on a set of time-domain data samples to obtain a set of frequency-domain data samples in response to selecting a frequency-domain equalization scheme. In some implementations, the communication manager 420 may be configured or otherwise support components for performing a frequency-domain equalization scheme using the set of frequency-domain data samples to obtain an equalized set of frequency-domain data samples.

[0110] In some implementations, the communication manager 420 may be configured or otherwise support means for performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain an equalized set of time-domain data samples. In some implementations, the communication manager 420 may be configured or otherwise support means for demodulating the equalized set of time-domain data samples to obtain a set of modulation symbols.

[0111] In some implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme may be based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 420 may be configured to or otherwise support a component for selecting the time domain equalization scheme if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 420 may be configured to or otherwise support a component for selecting the frequency domain equalization scheme if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition.

[0112] In some implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme can be based on the delay spread associated with the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 420 can be configured or otherwise supports a component for selecting the time domain equalization scheme if the delay spread is below a threshold delay spread. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 420 can be configured or otherwise supports a component for selecting the frequency domain equalization scheme if the delay spread is above a threshold delay spread.

[0113] In some implementations, the communications manager 420 may be configured or otherwise support components for obtaining a pilot signal measurement set. In some implementations, the communications manager 420 may be configured or otherwise support components for obtaining an indication of a channel condition using a pilot signal measurement set.

[0114] In some implementations, the communication manager 420 can be configured or otherwise support components for performing a selected time domain equalization scheme or a frequency domain equalization scheme based on a channel estimate associated with a pilot signal measurement set.

[0115] In some implementations, the set of time-domain data samples can be associated with a DFT-s-OFDM modulation scheme.

[0116] In some implementations, to support obtaining a set of time domain data samples, the communication manager 420 may be configured or otherwise support components for obtaining a set of time domain data samples based on a downlink channel of a radio frequency spectrum band or a side link channel of a radio frequency spectrum band.

[0117] In some implementations, the communication manager 420 may be configured to perform various operations (such as receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 415, one or more antennas 425, or any combination thereof. Although the communication manager 420 is illustrated as a component of the transceiver 415, in some implementations, one or more functions described with reference to the communication manager 420 may be supported or performed by the transceiver 415, the processor 440, the memory 430, the code 435, or any combination thereof. For example, the code 435 may include instructions that are executable by the processor 440 to cause the device 405 to perform various aspects of equalization domain selection at the wireless device as described herein, or the processor 440 and the memory 430 may be otherwise configured to perform or support such operations.

[0118] Figure 5A diagram of an example of a system 500 including a device 505 supporting equalization domain selection at a wireless device is shown. The device 505 may communicate with one or more network entities (such as one or more components of one or more BSs 140), one or more UEs 115, or any combination thereof, which may include communication through one or more wired interfaces, through one or more wireless interfaces, or any combination thereof. The device 505 may include components that support output and acquisition communications, such as a communication manager 520, a transceiver 510, an antenna 515, a memory 525, code 530, and a processor 535. These components may be in electronic communication or otherwise coupled (such as operatively, communicatively, functionally, electronically, electrically) via one or more buses (such as a bus 540).

[0119] As described herein, the transceiver 510 may support bidirectional communication via a wired link, a wireless link, or both. In some specific implementations, the transceiver 510 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, the transceiver 510 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some specific implementations, the device 505 may include one or more antennas 515, which may be capable of (such as concurrently) sending or receiving wireless transmissions. The transceiver 510 may also include a modem for modulating a signal, for providing a modulated signal for transmission (such as through one or more antennas 515, through a wired transmitter), for receiving a modulated signal (such as from one or more antennas 515, from a wired receiver), and for demodulating a signal. In some implementations, the transceiver 510 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 515 configured to support various receiving or obtaining operations, or one or more interfaces coupled to one or more antennas 515 configured to support various transmitting operations or output operations, or a combination thereof. In some implementations, the transceiver 510 may include or be configured to be coupled to one or more processors or memory components that are operable to: perform or support operations based on received or obtained information or signals; or generate information or other signals for transmission or other output, or any combination thereof. In some implementations, the transceiver 510, or the transceiver 510 and one or more antennas 515, or the transceiver 510 and one or more antennas 515 and one or more processors or memory components (such as a processor 535, or a memory 525, or both) may be included in a chip or chip component installed in the device 505. In some implementations, the transceiver may be operable to support communications via one or more communication links, such as communication link 125 , backhaul communication link 120 , midhaul communication link 162 , and fronthaul communication link 168 .

[0120] The memory 525 may include RAM and ROM. The memory 525 may store computer-readable, computer-executable code 530 including instructions that, when executed by the processor 535, cause the device 505 to perform various functions described herein. The code 530 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some implementations, the code 530 may not be directly executable by the processor 535, but may cause a computer (such as when compiled and executed) to perform the functions described herein. In some implementations, the memory 525 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0121] The processor 535 may include an intelligent hardware device (such as a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some specific implementations, the processor 535 may be configured to operate a memory array using a memory controller. In some specific implementations, the memory controller may be integrated into the processor 535. The processor 535 may be configured to execute computer-readable instructions stored in a memory (such as a memory 525) to enable the device 505 to perform various functions (such as functions or tasks that support equalization domain selection at a wireless device). For example, the device 505 or a component of the device 505 may include a processor 535 and a memory 525 coupled to the processor 535, and the processor 535 and the memory 525 are configured to perform various functions described herein. The processor 535 may be an example of a cloud computing platform (such as one or more physical nodes and supporting software such as an operating system, a virtual machine, or a container instance), which may host functions (such as by executing code 530) to perform the functions of the device 505. The processor 535 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 505 (such as in the memory 525). In some specific implementations, the processor 535 may be a component of a processing system. A processing system may generally refer to a system or a series of machines or components that receive inputs and process these inputs to produce an output set (which may be passed to other systems or components (e.g., the device 505)). For example, the processing system of the device 505 may refer to a system including various other components or subcomponents of the device 505, such as the processor 535, or the transceiver 510, or the communication manager 520, or other components or combinations of components of the device 505. The processing system of the device 505 may be docked with other components of the device 505, and may process information (such as input or signals) received from other components or output information to other components. For example, a chip or modem of the device 505 may include a processing system and one or more interfaces for outputting information or for obtaining information or both. The one or more interfaces may be implemented as or otherwise include a first interface configured to output information and a second interface configured to obtain information, or the same interface configured to output information and obtain information, as well as other specific implementations. In some specific implementations, the one or more interfaces may refer to an interface between a processing system of a chip or modem and a transmitter, so that the device 505 can send information output from the chip or modem. Additionally or alternatively, in some specific implementations, the one or more interfaces may refer to an interface between a processing system of a chip or modem and a receiver, so that the device 505 can obtain information or signal input, and the information can be passed to the processing system.One of ordinary skill in the art will readily recognize that the first interface may also obtain information or signal input, and the second interface may also output information or signal output.

[0122] In some implementations, the bus 540 may support communications of a protocol layer (such as within a protocol layer) of a protocol stack. In some implementations, the bus 540 may support communications associated with a logical channel of a protocol stack (such as between protocol layers of a protocol stack), which may include communications performed within a component of the device 505, or communications performed between different components of the device 505 that may be co-located or located in different locations (such as where the device 505 may refer to a system in which one or more of the communication manager 520, transceiver 510, memory 525, code 530, and processor 535 may be located in one of these different components or divided between different components).

[0123] In some implementations, the communication manager 520 can manage aspects of communications with the core network 130, such as via one or more wired or wireless backhaul links. For example, the communication manager 520 can manage the delivery of data communications for client devices, such as one or more UEs 115. In some implementations, the communication manager 520 can manage communications with other network entities 105 and can include a controller or scheduler for controlling communications with the UE 115 in collaboration with the other network entities 105. In some implementations, the communication manager 520 can support an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between network entities 105.

[0124] According to the examples disclosed herein, the communication manager 520 may support wireless communications at a wireless device. For example, the communication manager 520 may be configured to or otherwise support components for: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; and selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band. In some specific implementations, the communication manager 520 may be configured to or otherwise support components for obtaining a set of time domain data samples based on the channel of the radio frequency spectrum band. In some specific implementations, the communication manager 520 may be configured to or otherwise support components for outputting a set of modulation symbols based on a set of time domain data samples using a selected time domain equalization scheme or a frequency domain equalization scheme.

[0125] In some implementations, the communication manager 520 may be configured or otherwise support components for resampling the set of time-domain data samples according to the OFDM symbol rate in response to selecting a time-domain equalization scheme to obtain a resampled set of time-domain data samples. In some implementations, the communication manager 520 may be configured or otherwise support components for performing a time-domain equalization scheme using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

[0126] In some implementations, to support resampling of a set of time-domain data samples, the communication manager 520 can be configured or otherwise support components for inputting the set of time-domain data samples into a Farrow resampler.

[0127] In some implementations, the communication manager 520 can be configured or otherwise support components for demodulating the equalized set of time-domain data samples to obtain a set of modulation symbols.

[0128] In some implementations, the communication manager 520 can be configured or otherwise support components for executing a time-domain equalization scheme using the set of time-domain data samples to obtain an equalized set of time-domain data samples in response to selecting the time-domain equalization scheme.

[0129] In some implementations, the communication manager 520 may be configured to or otherwise support means for resampling the equalized set of time-domain data samples according to the OFDM symbol rate to obtain a resampled equalized set of time-domain data samples. In some implementations, the communication manager 520 may be configured to or otherwise support means for demodulating the resampled equalized set of time-domain data samples to obtain a set of modulation symbols.

[0130] In some implementations, to support resampling of the equalized set of time-domain data samples, the communication manager 520 can be configured or otherwise support components for inputting the equalized set of time-domain data samples into a Farrow resampler.

[0131] In some implementations, the communication manager 520 may be configured or otherwise support components for performing a Fourier transform on a set of time-domain data samples to obtain a set of frequency-domain data samples in response to selecting a frequency-domain equalization scheme. In some implementations, the communication manager 520 may be configured or otherwise support components for performing a frequency-domain equalization scheme using the set of frequency-domain data samples to obtain an equalized set of frequency-domain data samples.

[0132] In some implementations, the communication manager 520 may be configured or otherwise support means for performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain an equalized set of time-domain data samples. In some implementations, the communication manager 520 may be configured or otherwise support means for demodulating the equalized set of time-domain data samples to obtain a set of modulation symbols.

[0133] In some implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme may be based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 520 may be configured to or otherwise support a component for selecting the time domain equalization scheme if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 520 may be configured to or otherwise support a component for selecting the frequency domain equalization scheme if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition.

[0134] In some implementations, the selection between the time domain equalization scheme and the frequency domain equalization scheme can be based on the delay spread associated with the channel condition. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 520 can be configured or otherwise supports a component for selecting the time domain equalization scheme if the delay spread is below a threshold delay spread. In some implementations, to support the selection between the time domain equalization scheme and the frequency domain equalization scheme, the communication manager 520 can be configured or otherwise supports a component for selecting the frequency domain equalization scheme if the delay spread is above a threshold delay spread.

[0135] In some implementations, the communications manager 520 can be configured or otherwise support components for obtaining a pilot signal measurement set. In some implementations, the communications manager 520 can be configured or otherwise support components for obtaining an indication of a channel condition using a pilot signal measurement set.

[0136] In some implementations, the communication manager 520 can be configured or otherwise support components for performing a selected time domain equalization scheme or a frequency domain equalization scheme based on a channel estimate associated with a pilot signal measurement set.

[0137] In some implementations, the set of time-domain data samples is associated with a DFT-s-OFDM modulation scheme.

[0138] In some implementations, to support obtaining a set of time domain data samples, the communication manager 520 may be configured or otherwise support components for obtaining a set of time domain data samples based on a downlink channel of a radio frequency spectrum band or a side link channel of a radio frequency spectrum band.

[0139] In some implementations, the communication manager 520 may be configured to perform various operations (such as receiving, obtaining, monitoring, outputting, transmitting) using or otherwise cooperating with the transceiver 510, one or more antennas 515 (where applicable), or any combination thereof. Although the communication manager 520 is illustrated as a separate component, in some implementations, one or more functions described with reference to the communication manager 520 may be supported or performed by the processor 535, the memory 525, the code 530, the transceiver 510, or any combination thereof. For example, the code 530 may include instructions that are executable by the processor 535 to cause the device 505 to perform various aspects of equalization domain selection at the wireless device as described herein, or the processor 535 and the memory 525 may be otherwise configured to perform or support such operations.

[0140] Figure 6 A flow chart illustrating a method 600 for supporting equalization domain selection at a wireless device is shown. The operations of the method 600 may be implemented by a UE or a network entity or a component thereof as described herein. For example, the operations of the method 600 may be implemented by a UE or a network entity or a component thereof as described herein. Figures 1 to 5 The described UE 115 or network entity may be performed. In some specific implementations, the UE or network entity may execute an instruction set to control the functional elements of the UE or network entity to perform the described functions. Additionally or alternatively, the UE or network entity may use dedicated hardware to perform various aspects of the described functions.

[0141] At 605, the method may include obtaining an indication of a channel condition of a channel of a radio frequency spectrum band. The operations of 605 may be performed according to examples as disclosed herein.

[0142] At 610, the method may include selecting between a time domain equalization scheme and a frequency domain equalization scheme using an indication of a channel condition of a channel of a radio frequency spectrum band. The operations of 610 may be performed according to examples as disclosed herein.

[0143] At 615, the method may include obtaining a set of time domain data samples according to a channel of a radio frequency spectrum band. The operation of 615 may be performed according to examples as disclosed herein.

[0144] At 620, the method may include outputting a set of modulation symbols based on the set of time-domain data samples using the selected time-domain equalization scheme or frequency-domain equalization scheme. The operations of 620 may be performed according to examples as disclosed herein.

[0145] The following provides an overview of some aspects of the disclosure:

[0146] Aspect 1: A device for wireless communication, the device comprising: one or more interfaces, the one or more interfaces being configured to: obtain an indication of a channel condition of a channel of a radio frequency spectrum band; and a processing system, the processing system being configured to: use the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; the one or more interfaces being configured to: obtain a set of time domain data samples based on the channel of the radio frequency spectrum band; and output a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0147] Aspect 2: An apparatus according to Aspect 1, wherein the processing system is further configured to: in response to selecting the time domain equalization scheme, resample the time domain data sample set according to the OFDM symbol rate to obtain a resampled time domain data sample set; and use the resampled time domain data sample set to execute the time domain equalization scheme to obtain an equalized time domain data sample set.

[0148] Aspect 3: The apparatus according to aspect 2, wherein in order to resample the set of time-domain data samples, the processing system is configured to input the set of time-domain data samples into a Farrow resampler.

[0149] Aspect 4: The apparatus according to any one of aspects 2 to 3, wherein the processing system is further configured to demodulate the equalized set of time-domain data samples to obtain the set of modulation symbols.

[0150] Aspect 5: The apparatus according to any one of Aspects 1 to 4, wherein the processing system is further configured to, in response to selecting the time domain equalization scheme, perform the time domain equalization scheme using the time domain data sample set to obtain an equalized time domain data sample set.

[0151] Aspect 6: An apparatus according to Aspect 5, wherein the processing system is further configured to: resample the equalized time domain data sample set according to an OFDM symbol rate to obtain a resampled equalized time domain data sample set; and demodulate the resampled equalized time domain data sample set to obtain the modulation symbol set.

[0152] Aspect 7: The apparatus according to Aspect 6, wherein in order to resample the equalized set of time-domain data samples, the processing system is configured to input the equalized set of time-domain data samples into a Farrow resampler.

[0153] Aspect 8: An apparatus according to any one of Aspects 1 to 7, wherein the processing system is further configured to: in response to selecting the frequency domain equalization scheme, perform a Fourier transform on the time domain data sample set to obtain a frequency domain data sample set; and use the frequency domain data sample set to perform the frequency domain equalization scheme to obtain an equalized frequency domain data sample set.

[0154] Aspect 9: An apparatus according to Aspect 8, wherein the processing system is further configured to: perform an inverse Fourier transform on the equalized frequency domain data sample set to obtain an equalized time domain data sample set; and demodulate the equalized time domain data sample set to obtain the modulation symbol set.

[0155] Aspect 10: An apparatus according to any one of Aspects 1 to 9, wherein the processing system is further configured to select between the time domain equalization scheme and the frequency domain equalization scheme based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition.

[0156] Aspect 11: An apparatus according to Aspect 10, wherein, in order to select between the time domain equalization scheme and the frequency domain equalization scheme, the processing system is configured to: if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, select the time domain equalization scheme; or if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, select the frequency domain equalization scheme.

[0157] Aspect 12: The apparatus according to any one of aspects 1 to 11, wherein the processing system is further configured to select between the time domain equalization scheme and the frequency domain equalization scheme according to a delay spread associated with the channel condition.

[0158] Aspect 13: An apparatus according to Aspect 12, wherein, in order to select between the time domain equalization scheme and the frequency domain equalization scheme, the processing system is configured to: select the time domain equalization scheme if the delay spread is lower than a threshold delay spread; or select the frequency domain equalization scheme if the delay spread is higher than the threshold delay spread.

[0159] Aspect 14: An apparatus according to any one of Aspects 1 to 13, wherein the one or more interfaces are also configured to obtain a pilot signal measurement set, and the processing system is also configured to obtain the indication of the channel condition using the pilot signal measurement set.

[0160] Aspect 15: The apparatus according to Aspect 14, wherein the processing system is further configured to perform the selected time domain equalization scheme or frequency domain equalization scheme according to the channel estimate associated with the pilot signal measurement set.

[0161] Aspect 16: The apparatus according to any one of aspects 1 to 15, wherein the set of time domain data samples is associated with a DFT-s-OFDM modulation scheme.

[0162] Aspect 17: The apparatus according to any one of aspects 1 to 16, wherein obtaining the set of time domain data samples is performed at a UE.

[0163] Aspect 18: An apparatus according to any one of Aspects 1 to 17, wherein in order to obtain the set of time domain data samples, the one or more interfaces are configured to obtain the set of time domain data samples based on a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

[0164] Aspect 19: The apparatus according to any one of Aspects 1 to 18, the apparatus being included in a UE.

[0165] Aspect 20: A method for performing wireless communications at a wireless device, the method comprising: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; using the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; obtaining a set of time domain data samples based on the channel of the radio frequency spectrum band; and outputting a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0166] Aspect 21: According to the method described in Aspect 20, the method also includes: in response to selecting the time domain equalization scheme, resampling the time domain data sample set according to the OFDM symbol rate to obtain a resampled time domain data sample set; and using the resampled time domain data sample set to execute the time domain equalization scheme to obtain an equalized time domain data sample set.

[0167] Aspect 22: The method according to Aspect 21, wherein resampling the set of time-domain data samples comprises: inputting the set of time-domain data samples into a Farrow resampler.

[0168] Aspect 23: According to the method according to any one of Aspects 21 to 22, the method further comprises: demodulating the equalized set of time-domain data samples to obtain the set of modulation symbols.

[0169] Aspect 24: According to the method of any one of Aspects 20 to 23, the method further comprises: in response to selecting the time domain equalization scheme, performing the time domain equalization scheme using the time domain data sample set to obtain an equalized time domain data sample set.

[0170] Aspect 25: According to the method described in Aspect 24, the method also includes: resampling the equalized time domain data sample set according to the OFDM symbol rate to obtain a resampled equalized time domain data sample set; and demodulating the resampled equalized time domain data sample set to obtain the modulation symbol set.

[0171] Aspect 26: The method according to Aspect 25, wherein resampling the equalized set of time-domain data samples comprises: inputting the equalized set of time-domain data samples into a Farrow resampler.

[0172] Aspect 27: According to the method described in any one of Aspects 20 to 26, the method further includes: in response to selecting the frequency domain equalization scheme, performing Fourier transform on the time domain data sample set to obtain a frequency domain data sample set; and using the frequency domain data sample set to perform the frequency domain equalization scheme to obtain an equalized frequency domain data sample set.

[0173] Aspect 28: According to the method of Aspect 27, the method also includes: performing an inverse Fourier transform on the equalized frequency domain data sample set to obtain an equalized time domain data sample set; and demodulating the equalized time domain data sample set to obtain the modulation symbol set.

[0174] Aspect 29: A method according to any one of Aspects 20 to 28, wherein the selection between the time domain equalization scheme and the frequency domain equalization scheme is based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition.

[0175] Aspect 30: A method according to Aspect 29, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme includes: if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, selecting the time domain equalization scheme; or if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, selecting the frequency domain equalization scheme.

[0176] Aspect 31: The method according to any one of aspects 20 to 30, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel condition.

[0177] Aspect 32: A method according to Aspect 31, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme comprises: if the delay spread is lower than a threshold delay spread, selecting the time domain equalization scheme; or if the delay spread is higher than the threshold delay spread, selecting the frequency domain equalization scheme.

[0178] Aspect 33: According to any one of aspects 20 to 32, the method further includes: obtaining a pilot signal measurement set; and obtaining the indication of the channel condition using the pilot signal measurement set.

[0179] Aspect 34: The method according to Aspect 33 further comprises: performing the selected time domain equalization scheme or frequency domain equalization scheme according to the channel estimate associated with the pilot signal measurement set.

[0180] Aspect 35: The method according to any one of aspects 20 to 34, wherein the set of time domain data samples is associated with a DFT-s-OFDM modulation scheme.

[0181] Aspect 36: The method according to any one of aspects 20 to 35, wherein obtaining the set of time domain data samples is performed at a UE.

[0182] Aspect 37: A method according to any one of Aspects 20 to 36, wherein obtaining the set of time domain data samples comprises: obtaining the set of time domain data samples based on a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

[0183] Aspect 38: An apparatus for performing wireless communications at a wireless device, the apparatus comprising: a component for obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; a component for selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band; a component for obtaining a set of time domain data samples based on the channel of the radio frequency spectrum band; and a component for outputting a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0184] Aspect 39: According to the device of Aspect 38, the device also includes: a component for resampling the time domain data sample set according to the OFDM symbol rate in response to selecting the time domain equalization scheme to obtain a resampled time domain data sample set; and a component for executing the time domain equalization scheme using the resampled time domain data sample set to obtain an equalized time domain data sample set.

[0185] Aspect 40: The apparatus according to Aspect 39, wherein the means for resampling the set of time-domain data samples comprises: means for inputting the set of time-domain data samples into a Farrow resampler.

[0186] Aspect 41: The apparatus according to any one of aspects 39 to 40, further comprising: a component for demodulating the equalized set of time-domain data samples to obtain the set of modulation symbols.

[0187] Aspect 42: The apparatus according to any one of Aspects 38 to 41, further comprising: a component for executing the time domain equalization scheme using the time domain data sample set to obtain an equalized time domain data sample set in response to selecting the time domain equalization scheme.

[0188] Aspect 43: According to the device of Aspect 42, the device also includes: a component for resampling the equalized time domain data sample set according to the OFDM symbol rate to obtain a resampled equalized time domain data sample set; and a component for demodulating the resampled equalized time domain data sample set to obtain the modulation symbol set.

[0189] Aspect 44: The apparatus according to Aspect 43, wherein the means for resampling the equalized set of time-domain data samples comprises: means for inputting the equalized set of time-domain data samples into a Farrow resampler.

[0190] Aspect 45: An apparatus according to any one of Aspects 38 to 44, the apparatus further comprising: a component for performing a Fourier transform on the time domain data sample set in response to selecting the frequency domain equalization scheme to obtain a frequency domain data sample set; and a component for performing the frequency domain equalization scheme using the frequency domain data sample set to obtain an equalized frequency domain data sample set.

[0191] Aspect 46: According to the device of Aspect 45, the device also includes: a component for performing an inverse Fourier transform on the equalized frequency domain data sample set to obtain an equalized time domain data sample set; and a component for demodulating the equalized time domain data sample set to obtain the modulation symbol set.

[0192] Aspect 47: An apparatus according to any one of Aspects 38 to 46, wherein the selection between the time domain equalization scheme and the frequency domain equalization scheme is based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition.

[0193] Aspect 48: An apparatus according to Aspect 47, wherein the component for selecting between the time domain equalization scheme and the frequency domain equalization scheme includes: a component for selecting the time domain equalization scheme if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition; or a component for selecting the frequency domain equalization scheme if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition.

[0194] Aspect 49: The apparatus according to any one of aspects 38 to 48, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel condition.

[0195] Aspect 50: An apparatus according to Aspect 49, wherein the component for selecting between the time domain equalization scheme and the frequency domain equalization scheme includes: a component for selecting the time domain equalization scheme if the delay spread is lower than a threshold delay spread; and a component for selecting the frequency domain equalization scheme if the delay spread is higher than the threshold delay spread.

[0196] Aspect 51: An apparatus according to any one of Aspects 38 to 50, the apparatus further comprising: a component for obtaining a pilot signal measurement set; and a component for obtaining the indication of the channel condition using the pilot signal measurement set.

[0197] Aspect 52: The apparatus according to aspect 51, further comprising: a component for performing the selected time domain equalization scheme or frequency domain equalization scheme according to the channel estimate associated with the pilot signal measurement set.

[0198] Aspect 53: An apparatus according to any one of aspects 38 to 52, wherein the set of time domain data samples is associated with a DFT-s-OFDM modulation scheme.

[0199] Aspect 54: An apparatus according to any one of aspects 38 to 53, wherein obtaining the set of time domain data samples is performed at a UE.

[0200] Aspect 55: An apparatus according to any one of Aspects 38 to 54, wherein the component for obtaining the set of time domain data samples includes: a component for obtaining the set of time domain data samples based on a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

[0201] Aspect 56: A non-transitory computer-readable medium storing code for wireless communication at a wireless device, the code comprising instructions executable by a processor to: obtain an indication of a channel condition of a channel of a radio frequency spectrum band; use the indication of the channel condition of the channel of the radio frequency spectrum band to select between a time domain equalization scheme and a frequency domain equalization scheme; obtain a set of time domain data samples based on the channel of the radio frequency spectrum band; and output a set of modulation symbols based on the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

[0202] Aspect 57: A non-transitory computer-readable medium according to Aspect 56, wherein the instructions are also executable by the processor to: in response to selecting the time domain equalization scheme, resample the time domain data sample set according to the OFDM symbol rate to obtain a resampled time domain data sample set; and use the resampled time domain data sample set to execute the time domain equalization scheme to obtain an equalized time domain data sample set.

[0203] Aspect 58: The non-transitory computer-readable medium of aspect 57, wherein the instructions for resampling the set of time-domain data samples are executable by the processor to: input the set of time-domain data samples into a Farrow resampler.

[0204] Aspect 59: The non-transitory computer-readable medium according to any one of aspects 57 to 58, wherein the instructions are further executable by the processor to: demodulate the equalized set of time-domain data samples to obtain the set of modulation symbols.

[0205] Aspect 60: A non-transitory computer-readable medium according to any one of Aspects 56 to 59, wherein the instructions are also executable by the processor to: in response to selecting the time domain equalization scheme, perform the time domain equalization scheme using the time domain data sample set to obtain an equalized time domain data sample set.

[0206] Aspect 61: A non-transitory computer-readable medium according to Aspect 60, wherein the instructions are also executable by the processor to: resample the equalized set of time domain data samples according to an OFDM symbol rate to obtain a resampled equalized set of time domain data samples; and demodulate the resampled equalized set of time domain data samples to obtain the modulation symbol set.

[0207] Aspect 62: The non-transitory computer-readable medium according to Aspect 61, wherein the instructions for resampling the equalized set of time-domain data samples are executable by the processor to: input the equalized set of time-domain data samples into a Farrow resampler.

[0208] Aspect 63: A non-transitory computer-readable medium according to any one of Aspects 56 to 62, wherein the instructions are also capable of being executed by the processor to: in response to selecting the frequency domain equalization scheme, perform a Fourier transform on the time domain data sample set to obtain a frequency domain data sample set; and use the frequency domain data sample set to perform the frequency domain equalization scheme to obtain an equalized frequency domain data sample set.

[0209] Aspect 64: A non-transitory computer-readable medium according to Aspect 63, wherein the instructions are also executable by the processor to: perform an inverse Fourier transform on the equalized set of frequency domain data samples to obtain a set of equalized time domain data samples; and demodulate the equalized set of time domain data samples to obtain the set of modulation symbols.

[0210] Aspect 65: A non-transitory computer-readable medium according to any one of Aspects 56 to 64, wherein the selection between the time domain equalization scheme and the frequency domain equalization scheme is based on the power associated with the time domain equalization scheme corresponding to the channel condition and the power associated with the frequency domain equalization scheme corresponding to the channel condition.

[0211] Aspect 66: A non-transitory computer-readable medium according to Aspect 65, wherein the instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme are executable by the processor to: select the time domain equalization scheme if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition; or select the frequency domain equalization scheme if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition.

[0212] Aspect 67: The non-transitory computer-readable medium of any one of aspects 56 to 66, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel condition.

[0213] Aspect 68: A non-transitory computer-readable medium according to Aspect 67, wherein the instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme are executable by the processor to: select the time domain equalization scheme if the delay spread is lower than a threshold delay spread; or select the frequency domain equalization scheme if the delay spread is higher than the threshold delay spread.

[0214] Aspect 69: A non-transitory computer-readable medium according to any one of Aspects 56 to 68, wherein the instructions are also executable by the processor to: obtain a pilot signal measurement set; and obtain the indication of the channel condition using the pilot signal measurement set.

[0215] Aspect 70: The non-transitory computer-readable medium according to aspect 69, wherein the instructions are further executable by the processor to: perform the selected time domain equalization scheme or frequency domain equalization scheme based on the channel estimate associated with the pilot signal measurement set.

[0216] Aspect 71: The non-transitory computer readable medium of any one of aspects 56 to 70, wherein the set of time domain data samples is associated with a DFT-s-OFDM modulation scheme.

[0217] Aspect 72: The non-transitory computer-readable medium according to any one of aspects 56 to 71, wherein obtaining the set of time domain data samples is performed at a UE.

[0218] Aspect 73: A non-transitory computer-readable medium according to any one of Aspects 56 to 72, wherein the instructions for obtaining the set of time domain data samples are executable by the processor to: obtain the set of time domain data samples based on a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

[0219] As used herein, the term "determine" or "determine" encompasses a wide variety of actions, and thus, "determine" may include calculating, computing, processing, deriving, investigating, searching (such as via searching in a table, database, or other data structure), reasoning, ascertaining, and similar actions. Additionally, "determine" may include receiving (such as receiving information), accessing (such as accessing data stored in a memory), and similar actions. Additionally, "determine" may include parsing, selecting, choosing, establishing, and other such similar actions.

[0220] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items (including single members). As an example, "at least one of a, b, or c" is intended to cover: a, b, c, ab, ac, bc, and abc.

[0221] The various illustrative logical components, logic blocks, modules, circuits, and algorithmic processes described in conjunction with the specific implementations disclosed herein may be implemented as electronic hardware, computer software, or a combination of the two. The interchangeability of hardware and software has been generally described in terms of functionality and is illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented using hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0222] Hardware and data processing devices for implementing the various illustrative logics, logic blocks, modules, and circuits described in conjunction with the various aspects disclosed herein may be implemented or executed using a general purpose single-chip or multi-chip processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration. In some implementations, specific processes and methods may be performed by circuits specific to a given function.

[0223] In one or more aspects, the functions described may be implemented using hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents, or in any combination thereof. Specific implementations of the subject matter described in this specification may also be implemented as one or more computer programs, such as one or more modules of computer program instructions encoded on computer storage media for execution by a data processing device or for controlling the operation of a data processing device.

[0224] If implemented in software, the function can be stored or sent using one or more instructions or codes of a computer-readable medium. The process of the method or algorithm disclosed herein can be implemented in a processor executable software module that can reside on a computer-readable medium. Computer-readable media include both computer storage media and communication media, and the communication media include any medium that can be implemented to transfer a computer program from one location to another. The storage medium can be any available medium accessible to a computer. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of an instruction or data structure and can be accessed by a computer. In addition, any connection can be appropriately referred to as a computer-readable medium. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks, and blue-ray disks. Disks can reproduce data magnetically, and optical disks can reproduce data optically with lasers. The above combination should also be included in the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine-readable medium and a computer-readable medium, which may be incorporated into a computer program product.

[0225] Various modifications to the specific implementations described in this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other specific implementations without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the specific implementations shown herein, but should be granted the widest scope consistent with the disclosure, the principles and features disclosed herein.

[0226] Additionally, one of ordinary skill in the art will readily recognize that the terms "upper" and "lower" are sometimes used for ease of describing the drawings and indicate relative positions corresponding to the orientation of the drawings on a correctly oriented page, and may not reflect the correct orientation of any device as implemented.

[0227] Certain features described in this specification in the context of a single implementation may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable subcombination. Furthermore, while features may be described above as functioning in some combination and even initially claimed as such, one or more features from a claimed combination may be removed from the combination, and a claimed combination may involve subcombinations or variations of subcombinations.

[0228] Similarly, although the operations are depicted in a specific order in the figure, this should not be understood as requiring such operations to be performed in the specific order shown or in a sequential order, or to perform all the illustrated operations to achieve the desired result. Further, the accompanying drawings can schematically depict one or more example processes in the form of a flow chart. However, other operations not depicted can be incorporated into the schematically illustrated example process. For example, one or more additional operations can be performed before, after, at the same time, or between any operations in the illustrated operations. In some environments, multitasking and parallel processing may be advantageous. In addition, the separation of each system component in the specific implementation described above should not be understood as requiring such separation in all specific implementations, but it should be understood that the described program components and systems can usually be integrated together in a single software product, or be packaged in multiple software products. In addition, other specific implementations are within the scope of the following claims. In some specific implementations, the actions described in the claims can be performed in different orders and still achieve the desired results.

Claims

1. A device for wireless communication, the device comprising: One or more interfaces, the one or more interfaces being configured to: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; and A processing system, the processing system being configured to: selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band; The one or more interfaces are configured to: Obtaining a set of time domain data samples according to the channel of the radio frequency spectrum band; and A set of modulation symbols is output according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

2. The apparatus of claim 1, wherein the processing system is further configured to: In response to selecting the time domain equalization scheme, resampling the set of time domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled set of time domain data samples; and The time-domain equalization scheme is performed using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

3. The apparatus according to claim 2, wherein in order to resample the set of time-domain data samples, the processing system is configured to: The time domain data sample set is input into a Farrow resampler.

4. The apparatus of claim 2, wherein the processing system is further configured to: The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

5. The apparatus of claim 1 , wherein the processing system is further configured to: In response to selecting the time-domain equalization scheme, the time-domain equalization scheme is performed using the set of time-domain data samples to obtain an equalized set of time-domain data samples.

6. The apparatus of claim 5, wherein the processing system is further configured to: resampling the equalized set of time-domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled equalized set of time-domain data samples; and The resampled equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

7. The apparatus according to claim 6, wherein, in order to resample the equalized set of time-domain data samples, the processing system is configured to: The equalized set of time-domain data samples is input into a Farrow resampler.

8. The apparatus of claim 1, wherein the processing system is further configured to: In response to selecting the frequency domain equalization scheme, performing a Fourier transform on the set of time domain data samples to obtain a set of frequency domain data samples; and The frequency domain equalization scheme is performed using the set of frequency domain data samples to obtain an equalized set of frequency domain data samples.

9. The apparatus of claim 8, wherein the processing system is further configured to: performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain a set of equalized time-domain data samples; and The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

10. The apparatus of claim 1, wherein the processing system is further configured to: A selection is made between the time domain equalization scheme and the frequency domain equalization scheme according to a power associated with the time domain equalization scheme corresponding to the channel condition and a power associated with the frequency domain equalization scheme corresponding to the channel condition.

11. The apparatus of claim 10, wherein in order to select between the time domain equalization scheme and the frequency domain equalization scheme, the processing system is configured to: If the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, selecting the time domain equalization scheme; or If the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, the frequency domain equalization scheme is selected.

12. The apparatus of claim 1, wherein the processing system is further configured to: A selection is made between the time domain equalization scheme and the frequency domain equalization scheme based on a delay spread associated with the channel condition.

13. The apparatus of claim 12, wherein in order to select between the time domain equalization scheme and the frequency domain equalization scheme, the processing system is configured to: If the delay spread is lower than a threshold delay spread, selecting the time domain equalization scheme; or If the delay spread is higher than the threshold delay spread, the frequency domain equalization scheme is selected.

14. The device according to claim 1, wherein: The one or more interfaces are further configured to obtain a pilot signal measurement set; and The processing system is further configured to obtain the indication of the channel condition using the pilot signal measurement set.

15. The apparatus of claim 14, wherein the processing system is further configured to: The selected time domain equalization scheme or frequency domain equalization scheme is performed based on the channel estimate associated with the pilot signal measurement set.

16. The apparatus of claim 1, wherein the set of time-domain data samples is associated with a discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM) modulation scheme.

17. The apparatus of claim 1, wherein obtaining the set of time-domain data samples is performed at a user equipment (UE).

18. The apparatus of claim 1, wherein to obtain the set of time-domain data samples, the one or more interfaces are configured to: The time domain data sample set is obtained according to a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

19. The apparatus of claim 1, the apparatus being included in a user equipment (UE).

20. A method for wireless communication at a wireless device, the method comprising: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band; Obtain a set of time domain data samples according to the channel of the radio frequency spectrum band; as well as A set of modulation symbols is output according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

21. The method according to claim 20, further comprising: In response to selecting the time domain equalization scheme, resampling the set of time domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled set of time domain data samples; as well as The time-domain equalization scheme is performed using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

22. The method of claim 21, wherein resampling the set of time domain data samples comprises: The time domain data sample set is input into a Farrow resampler.

23. The method according to claim 21, further comprising: The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

24. The method according to claim 20, further comprising: In response to selecting the time-domain equalization scheme, the time-domain equalization scheme is performed using the set of time-domain data samples to obtain an equalized set of time-domain data samples.

25. The method according to claim 24, further comprising: resampling the equalized set of time-domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled equalized set of time-domain data samples; as well as The resampled equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

26. The method of claim 25, wherein resampling the equalized set of time-domain data samples comprises: The equalized set of time-domain data samples is input into a Farrow resampler.

27. The method according to claim 20, further comprising: In response to selecting the frequency domain equalization scheme, performing a Fourier transform on the set of time domain data samples to obtain a set of frequency domain data samples; as well as The frequency domain equalization scheme is performed using the set of frequency domain data samples to obtain an equalized set of frequency domain data samples.

28. The method according to claim 27, further comprising: performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain a set of equalized time-domain data samples; as well as The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

29. The method of claim 20, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on power associated with the time domain equalization scheme corresponding to the channel condition and power associated with the frequency domain equalization scheme corresponding to the channel condition.

30. The method of claim 29, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme comprises: If the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, selecting the time domain equalization scheme; or If the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, the frequency domain equalization scheme is selected.

31. The method of claim 20, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel conditions.

32. The method of claim 31 , wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme comprises: If the delay spread is lower than a threshold delay spread, selecting the time domain equalization scheme; or If the delay spread is higher than the threshold delay spread, the frequency domain equalization scheme is selected.

33. The method of claim 20, further comprising: Obtaining a pilot signal measurement set; as well as The indication of the channel condition is obtained using the set of pilot signal measurements.

34. The method of claim 33, further comprising: The selected time domain equalization scheme or frequency domain equalization scheme is performed based on the channel estimate associated with the pilot signal measurement set.

35. The method of claim 20, wherein the set of time-domain data samples is associated with a discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM) modulation scheme.

36. The method of claim 20, wherein obtaining the set of time-domain data samples is performed at a user equipment (UE).

37. The method of claim 20, wherein obtaining the set of time domain data samples comprises: The time domain data sample set is obtained according to a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

38. An apparatus for wireless communication at a wireless device, the apparatus comprising: means for obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; means for selecting between a time domain equalization scheme and a frequency domain equalization scheme using said indication of said channel condition of said channel of said radio frequency spectrum band; means for obtaining a set of time domain data samples according to said channels of said radio frequency spectrum band; and means for outputting a set of modulation symbols from the set of time-domain data samples using the selected time-domain equalization scheme or frequency-domain equalization scheme.

39. The apparatus of claim 38, further comprising: means for resampling the set of time-domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled set of time-domain data samples in response to selecting the time-domain equalization scheme; and means for performing the time-domain equalization scheme using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

40. The apparatus of claim 39, wherein the means for resampling the set of time-domain data samples comprises: Means for inputting said set of time domain data samples into a Farrow resampler.

41. The apparatus of claim 39, further comprising: Means for demodulating the equalized set of time-domain data samples to obtain the set of modulation symbols.

42. The apparatus of claim 38, further comprising: Means for performing the time-domain equalization scheme using the set of time-domain data samples to obtain an equalized set of time-domain data samples in response to selecting the time-domain equalization scheme.

43. The apparatus of claim 42, further comprising: means for resampling the equalized set of time-domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled equalized set of time-domain data samples; and Means for demodulating the resampled equalized set of time-domain data samples to obtain the set of modulation symbols.

44. The apparatus of claim 43, wherein the means for resampling the equalized set of time-domain data samples comprises: Means for inputting said equalized set of time-domain data samples into a Farrow resampler.

45. The apparatus of claim 38, further comprising: means for performing a Fourier transform on the set of time domain data samples to obtain a set of frequency domain data samples in response to selecting the frequency domain equalization scheme; and Means for performing the frequency domain equalization scheme using the set of frequency domain data samples to obtain an equalized set of frequency domain data samples.

46. ​​The apparatus of claim 45, further comprising: means for performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain a set of equalized time-domain data samples; and Means for demodulating the equalized set of time-domain data samples to obtain the set of modulation symbols.

47. The apparatus of claim 38, wherein selection between the time domain equalization scheme and the frequency domain equalization scheme is based on power associated with the time domain equalization scheme corresponding to the channel condition and power associated with the frequency domain equalization scheme corresponding to the channel condition.

48. The apparatus of claim 47, wherein the means for selecting between the time domain equalization scheme and the frequency domain equalization scheme comprises: means for selecting the time domain equalization scheme if the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition; or means for selecting the frequency domain equalization scheme corresponding to the channel condition if the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition.

49. The apparatus of claim 38, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel conditions.

50. The apparatus of claim 49, wherein the means for selecting between the time domain equalization scheme and the frequency domain equalization scheme comprises: means for selecting said time domain equalization scheme if said delay spread is below a threshold delay spread; or Means for selecting the frequency domain equalization scheme if the delay spread is above the threshold delay spread.

51. The apparatus of claim 38, further comprising: means for obtaining a pilot signal measurement set; and Means for obtaining the indication of the channel condition using the pilot signal measurement set.

52. The apparatus of claim 51, further comprising: Means for performing a selected time domain equalization scheme or a frequency domain equalization scheme based on a channel estimate associated with the pilot signal measurement set.

53. The apparatus of claim 38, wherein the set of time-domain data samples is associated with a discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM) modulation scheme.

54. The apparatus of claim 38, wherein obtaining the set of time-domain data samples is performed at a user equipment (UE).

55. The apparatus of claim 38, wherein the means for obtaining the set of time-domain data samples comprises: A component for obtaining the set of time domain data samples according to a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

56. A non-transitory computer readable medium storing code for wireless communication at a wireless device, the code comprising instructions executable by a processor to: obtaining an indication of a channel condition of a channel of a radio frequency spectrum band; selecting between a time domain equalization scheme and a frequency domain equalization scheme using the indication of the channel condition of the channel of the radio frequency spectrum band; Obtain a set of time domain data samples according to the channel of the radio frequency spectrum band; as well as A set of modulation symbols is output according to the set of time domain data samples using the selected time domain equalization scheme or frequency domain equalization scheme.

57. The non-transitory computer readable medium of claim 56, wherein the instructions are further executable by the processor to: In response to selecting the time domain equalization scheme, resampling the set of time domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled set of time domain data samples; and The time-domain equalization scheme is performed using the resampled set of time-domain data samples to obtain an equalized set of time-domain data samples.

58. The non-transitory computer readable medium of claim 57, wherein the instructions for resampling the set of time-domain data samples are executable by the processor to: The time domain data sample set is input into a Farrow resampler.

59. The non-transitory computer readable medium of claim 57, wherein the instructions are further executable by the processor to: The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

60. The non-transitory computer readable medium of claim 56, wherein the instructions are further executable by the processor to: In response to selecting the time-domain equalization scheme, the time-domain equalization scheme is performed using the set of time-domain data samples to obtain an equalized set of time-domain data samples.

61. The non-transitory computer readable medium of claim 60, wherein the instructions are further executable by the processor to: resampling the equalized set of time-domain data samples according to an orthogonal frequency division multiplexing (OFDM) symbol rate to obtain a resampled equalized set of time-domain data samples; and The resampled equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

62. The non-transitory computer readable medium of claim 61, wherein the instructions for resampling the equalized set of time-domain data samples are executable by the processor to: The equalized set of time-domain data samples is input into a Farrow resampler.

63. The non-transitory computer readable medium of claim 56, wherein the instructions are further executable by the processor to: In response to selecting the frequency domain equalization scheme, performing a Fourier transform on the set of time domain data samples to obtain a set of frequency domain data samples; and The frequency domain equalization scheme is performed using the set of frequency domain data samples to obtain an equalized set of frequency domain data samples.

64. The non-transitory computer readable medium of claim 63, wherein the instructions are further executable by the processor to: performing an inverse Fourier transform on the equalized set of frequency-domain data samples to obtain a set of equalized time-domain data samples; and The equalized set of time-domain data samples is demodulated to obtain the set of modulation symbols.

65. The non-transitory computer-readable medium of claim 56, wherein selection between the time domain equalization scheme and the frequency domain equalization scheme is based on power associated with the time domain equalization scheme corresponding to the channel condition and power associated with the frequency domain equalization scheme corresponding to the channel condition.

66. The non-transitory computer readable medium of claim 65, wherein the instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme are executable by the processor to: If the power associated with the time domain equalization scheme corresponding to the channel condition is less than the power associated with the frequency domain equalization scheme corresponding to the channel condition, selecting the time domain equalization scheme; or If the power associated with the frequency domain equalization scheme corresponding to the channel condition is less than the power associated with the time domain equalization scheme corresponding to the channel condition, the frequency domain equalization scheme is selected.

67. The non-transitory computer-readable medium of claim 56, wherein selecting between the time domain equalization scheme and the frequency domain equalization scheme is based on a delay spread associated with the channel conditions.

68. The non-transitory computer readable medium of claim 67, wherein the instructions for selecting between the time domain equalization scheme and the frequency domain equalization scheme are executable by the processor to: If the delay spread is lower than a threshold delay spread, selecting the time domain equalization scheme; or If the delay spread is higher than the threshold delay spread, the frequency domain equalization scheme is selected.

69. The non-transitory computer readable medium of claim 56, wherein the instructions are further executable by the processor to: obtaining a pilot signal measurement set; and The indication of the channel condition is obtained using the set of pilot signal measurements.

70. The non-transitory computer readable medium of claim 69, wherein the instructions are further executable by the processor to: The selected time domain equalization scheme or frequency domain equalization scheme is performed based on the channel estimate associated with the pilot signal measurement set.

71. The non-transitory computer readable medium of claim 56, wherein the set of time-domain data samples is associated with a discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM) modulation scheme.

72. The non-transitory computer-readable medium of claim 56, wherein obtaining the set of time-domain data samples is performed at a user equipment (UE).

73. The non-transitory computer readable medium of claim 56, wherein the instructions for obtaining the set of time-domain data samples are executable by the processor to: The time domain data sample set is obtained according to a downlink channel of the radio frequency spectrum band or a side link channel of the radio frequency spectrum band.

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