Frequency-dependent residual side band (FDRSB) aware precoding

Abstract

In some aspects, an apparatus for wireless communication includes a receiver and a transmitter. The transmitter is configured to transmit a capability message that includes an indication of whether the receiver supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals. The receiver is configured to receive a signal that is precoded, in accordance with at least the indication of whether the receiver supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

Description

FREQUENCY-DEPENDENT RESIDUAL SIDE BAND (FDRSB) AWARE PRECODING CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Israel Patent Application No. 310424, entitled, “FREQUENCY-DEPENDENT RESIDUAL SIDE BAND (FDRSB) AWARE PRECODING” filed on January 26, 2024, which is expressly incorporated by reference herein in its entirety. TECHNICAL FIELD

[0002] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to frequency-dependent residual side band (FDRSB) aware precoding for wireless communication systems. INTRODUCTION

[0003] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks may be multiple access networks that support communications for multiple users by sharing the available network resources.

[0004] A wireless communication network may include several components. These components may include wireless communication devices, such as base stations (or node Bs) that may support communication for a number of user equipments (UEs). A UE may communicate with a base station via downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

[0005] A base station may transmit data and control information on a downlink to a UE or may receive data and control information on an uplink from the UE. On the downlink, a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters. On the uplink, a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF QLXX.P2036WOtransmitters. This interference may degrade performance on both the downlink and uplink.

[0006] For example, frequency-dependent residual side band (FDRSB) distortion may reduce performance in a wireless communication system. In some devices, such FDRSB distortion may result in or may be associated with a mismatch or imbalance between a transmitter component associated with in-phase (I) signal components and another transmitter component associated with quadrature (Q) signal components. To compensate for effects of FDRSB distortion, some wireless communication systems may reduce or limit one or more of a data transmission rate, a carrier frequency, or a quantity of transmit antennas used to transmit a signal. Such techniques may increase latency and may decrease throughput or quality of communication in a wireless communication system. Other techniques may compensate for FDRSB distortion by increasing transmit power associated with a transmitted signal, increasing energy consumption. BRIEF SUMMARY OF SOME EXAMPLES

[0007] In some aspects of the disclosure, an apparatus for wireless communication includes a receiver and a transmitter. The transmitter is configured to transmit a capability message that includes an indication of whether the receiver supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals. The receiver is configured to receive a signal that is precoded, in accordance with at least the indication of whether the receiver supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

[0008] In some other aspects, a method of wireless communication performed by a device includes transmitting a capability message that includes an indication of whether the device supports FDRSB distortion reduction for received signals. The method further includes receiving a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

[0009] In some other aspects, an apparatus for wireless communication includes a receiver configured to receive a capability message that includes an indication of whether a device supports FDRSB distortion reduction for received signals. The apparatus further includes a transmitter configured to transmit a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder. QLXX.P2036WO

[0010] While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. One or more features described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations may include integrated chip implementations and other non-module- component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, artificial intelligence (AI)-enabled devices, etc.). While some examples may or may not be directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range from chip-level or modular components to non-modular, non-chip-level implementations and as well as aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspects. For example, transmission and reception of wireless signals include a number of components for analog and digital purposes (e.g., hardware components including antenna, radio frequency (RF)-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders / summers, etc. One or more features described herein may be practiced in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label. QLXX.P2036WO

[0012] FIG. 1 is a block diagram illustrating example details of an example wireless communication system that supports frequency-dependent residual sideband (FDRSB) aware precoding according to one or more aspects.

[0013] FIG. 2 is a block diagram illustrating examples of a base station and a user equipment (UE) that support FDRSB aware precoding according to one or more aspects.

[0014] FIG. 3 is a block diagram illustrating an example wireless communication system that supports FDRSB aware precoding according to some aspects.

[0015] FIG.4 illustrates an example of a graph depicting some example aspects of FDRSB aware precoding according to some aspects.

[0016] FIG. 5 is a flow diagram illustrating an example process that supports FDRSB aware precoding according to one or more aspects.

[0017] FIG.6 is a flow diagram illustrating another example process that supports FDRSB aware precoding according to one or more aspects.

[0018] FIG. 7 is a block diagram of an example UE that supports FDRSB aware precoding according to one or more aspects.

[0019] FIG. 8 is a block diagram of an example network node that supports FDRSB aware precoding according to one or more aspects. DETAILED DESCRIPTION

[0020] In some aspects of the disclosure, a network node (such as a base station) may select a precoder from among multiple precoders for transmission of a signal. The multiple precoders may include a first precoder, such as a frequency-dependent residual side band (FDRSB) aware precoder, and may further include a second precoder, such as a non- FDRSB-aware precoder. In some implementations, use of the FDRSB aware precoder may reduce an amount of FDRSB distortion associated with the signal, may balance a signal to FDRSB noise ratio (SFNR) associated with the signal as compared to use of the non-FDRSB-aware precoder (such as by decreasing variability of the SFNR over a range of frequencies), or both.

[0021] In some implementations, the network node may select the precoder based on one or more criteria. In some examples, a user equipment (UE) may indicate whether the UE supports UE-side FDRSB reduction (e.g., based on whether the UE includes FDRSB reduction circuitry). In some such examples, the network node may select the non-FDRSB-aware precoder based on an indication that the UE supports UE-side FDRSB reduction or may QLXX.P2036WOselect the FDRSB aware precoder based on an indication that the UE does not support UE-side FDRSB reduction.

[0022] Alternatively, or in addition, the one or more criteria may include a battery status associated with the UE. For example, the network node may select the FDRSB aware precoder based on the UE indicating a relatively high battery charge or may select the non-FDRSB-aware precoder based on the UE indicating a relatively low battery charge. By selecting the non-FDRSB-aware precoder based on the UE indicating a relatively low battery charge, the network node may enable the UE to avoid use of the FDRSB reduction circuitry, which may be associated with a relatively large amount of power consumption.

[0023] Alternatively, or in addition, the one or more criteria may include an amount (or estimated amount) of FDRSB, such as an FDRSB floor compared to an amount of thermal noise in the wireless communication system. In some examples, if the FDRSB floor is relatively low compared to the amount of thermal noise, the network node may select the non- FDRSB-aware precoder. In some other examples, if the FDRSB floor is relatively high compared to the amount of thermal noise, the network node may select the FDRSB aware precoder.

[0024] One or more features described herein may improve performance within a wireless communication system. For example, by selecting among the multiple precoders, the network node may enable FDRSB reduction while also facilitating enhanced performance in the wireless communication system (e.g., by conserving power at the network node, at the UE, or both). For example, in some scenarios, the network node may use the FDRSB aware precoder to perform FDRSB reduction at the network node, such as in response to one or more of the UE not supporting UE-side FDRSB reduction, the UE being associated with a relatively low battery charge, or an amount of FDRSB distortion being relatively large. In some other scenarios, the network node may select the non-FDRSB-aware precoder and may “offload” or “delegate” to the UE the decision of whether to use FDRSB distortion reduction, such as in response to one or more of the UE supporting UE-side FDRSB reduction, the UE being associated with a relatively high battery charge, or an amount of FDRSB distortion being relatively low. As a result, FDRSB distortion reduction is enabled for a variety of circumstances, including for UEs that support UE- side FDRSB reduction as well as for UEs that do not support UE-side FDRSB reduction.

[0025] To further illustrate, by reducing variability in SFNR, performance may be improved in the wireless communication system. For example, in some wireless communication protocols, a modulation and coding scheme (MCS) may be based on, or may be affected QLXX.P2036WOby, the “worst case” SFNR. In such cases, larger variability in SFNR may limit the MCS or range of MCSs available to transmit data. By reducing variability in SFNR (e.g., by balancing, smoothing, or flattening SFNR for a range of frequencies), instances of such “worst case” SFNR may be reduced or eliminated, which may facilitate use of a greater range of MCSs to transmit data.

[0026] To further illustrate, some aspects of the disclosure relate to wireless communication networks including code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5thGeneration (5G) or new radio (NR) networks (sometimes referred to as “5G NR” networks, systems, or devices), as well as other communications networks. As described herein, the terms “networks” and “systems” may be used interchangeably.

[0027] A CDMA network, for example, may implement a radio technology such as universal terrestrial radio access (UTRA), cdma2000, and the like. UTRA includes wideband- CDMA (W-CDMA) and low chip rate (LCR). CDMA2000 covers IS-2000, IS-95, and IS-856 standards.

[0028] A TDMA network may, for example implement a radio technology such as Global System for Mobile Communication (GSM). The 3rd Generation Partnership Project (3GPP) defines standards for the GSM EDGE (enhanced data rates for GSM evolution) radio access network (RAN), also denoted as GERAN. GERAN is the radio component of GSM / EDGE, together with the network that joins the base stations (for example, the Ater and Abis interfaces) and the base station controllers (A interfaces, etc.). The radio access network represents a component of a GSM network, through which phone calls and packet data are routed from and to the public switched telephone network (PSTN) and Internet to and from subscriber handsets, also known as user terminals or user equipments (UEs). A mobile phone operator's network may comprise one or more GERANs, which may be coupled with UTRANs in the case of a UMTS / GSM network. Additionally, an operator network may also include one or more LTE networks, or one or more other networks. The various different network types may use different radio access technologies (RATs) and RANs.

[0029] An OFDMA network may implement a radio technology such as evolved UTRA (E- UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, QLXX.P2036WOIEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and GSM are part of universal mobile telecommunication system (UMTS). In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, LTE, and NR are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP), and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). These various radio technologies and standards are known or are being developed. For example, the 3GPP is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP LTE is a 3GPP project which was aimed at improving UMTS mobile phone standard. The 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G, or 5G NR technologies; however, the description is not intended to be limited to a specific technology or application, and one or more aspects described with reference to one technology may be understood to be applicable to another technology. Additionally, one or more aspects of the present disclosure may be related to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.

[0030] 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. To achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. The 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ~1 M nodes / km^2), ultra-low complexity (e.g., ~10 s of bits / sec), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~ 1 millisecond (ms)), and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ~ 10 Tbps / km^2), extreme data rates (e.g., multi- Gbps rate, 100+ Mbps user experienced rates), and deep awareness with advanced discovery and optimizations.

[0031] Devices, networks, and systems may be configured to communicate via one or more portions of the electromagnetic spectrum. The electromagnetic spectrum is often QLXX.P2036WOsubdivided, based on frequency or wavelength, into various classes, bands, channels, etc. In 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz – 7.125 GHz) and FR2 (24.25 GHz – 52.6 GHz). The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” (mmWave) band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz – 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “mmWave” band.

[0032] With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “mmWave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

[0033] 5G NR devices, networks, and systems may be implemented to use optimized OFDM- based waveform features. These features may include scalable numerology and transmission time intervals (TTIs); a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) design or frequency division duplex (FDD) design; and advanced wireless technologies, such as massive multiple input, multiple output (MIMO), robust mmWave transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3 GHz FDD or TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth. For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80 / 100 MHz bandwidth. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting QLXX.P2036WOwith mmWave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500 MHz bandwidth.

[0034] The scalable numerology of 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with uplink or downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink or downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.

[0035] For clarity, certain aspects of the apparatus and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric way, and 5G terminology may be used as illustrative examples in portions of the description below; however, the description is not intended to be limited to 5G applications.

[0036] Moreover, it should be understood that, in operation, wireless communication networks adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on loading and availability. Accordingly, it will be apparent to a person having ordinary skill in the art that the systems, apparatus and methods described herein may be applied to other communications systems and applications than the particular examples provided.

[0037] While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, packaging arrangements, etc. For example, implementations or uses may come about via integrated chip implementations or other non-module- component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail devices or purchasing devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, QLXX.P2036WOdistributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more described aspects. In some practical settings, devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described aspects. It is intended that innovations described herein may be practiced in a wide variety of implementations, including both large devices or small devices, chip-level components, multi-component systems (e.g., radio frequency (RF)-chain, communication interface, processor), distributed arrangements, aggregated or dis-aggregated deployments, end-user devices, etc. of varying sizes, shapes, and constitution.

[0038] FIG. 1 is a block diagram illustrating details of an example wireless communication system according to one or more aspects. The wireless communication system may include wireless network 100. Wireless network 100 may, for example, include a 5G wireless network. As appreciated by those skilled in the art, components appearing in FIG. 1 are likely to have related counterparts in other network arrangements including, for example, cellular-style network arrangements and non-cellular-style-network arrangements (e.g., device to device or peer to peer or ad hoc network arrangements, etc.).

[0039] Wireless network 100 illustrated in FIG. 1 includes a number of base stations 105 and other network entities. A base station may be a station that communicates with one or more UEs and may also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, and the like. Each base station 105 may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” may refer to this particular geographic coverage area of a base station or a base station subsystem serving the coverage area, depending on the context in which the term is used. In implementations of wireless network 100 herein, base stations 105 may be associated with a same operator or different operators (e.g., wireless network 100 may include a plurality of operator wireless networks). Additionally, in implementations of wireless network 100 herein, base station 105 may provide wireless communications using one or more of the same frequencies (e.g., one or more frequency bands in licensed spectrum, unlicensed spectrum, or a combination thereof) as a neighboring cell. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In some other examples, each base station 105 and UE 115 may be operated by a single network operating entity.

[0040] A base station may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, or other types of cell. A macro cell generally covers a QLXX.P2036WOrelatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like). A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station or a home base station. In the example shown in FIG. 1, base stations 105d and 105e are regular macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3 dimension (3D), full dimension (FD), or massive MIMO. Base stations 105a-105c take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station which may be a home node or portable access point. A base station may support one or multiple (e.g., two, three, four, and the like) cells.

[0041] Wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. In some scenarios, networks may be enabled or configured to handle dynamic switching between synchronous or asynchronous operations.

[0042] UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile. It should be appreciated that, although a mobile apparatus is commonly referred to as a UE in standards and specifications promulgated by the 3GPP, such apparatus may additionally or otherwise be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, a gaming device, an augmented reality device, vehicular component, vehicular QLXX.P2036WOdevice, or vehicular module, or some other suitable terminology. Within the present document, a “mobile” apparatus or UE need not necessarily have a capability to move, and may be stationary. Some non-limiting examples of a mobile apparatus, such as may include implementations of one or more of UEs 115, include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a laptop, a personal computer (PC), a notebook, a netbook, a smart book, a tablet, and a personal digital assistant (PDA). A mobile apparatus may additionally be an IoT or “Internet of everything” (IoE) device such as an automotive or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a global navigation satellite system (GNSS) device, a logistics controller, a drone, a multi-copter, a quad-copter, a smart energy or security device, a solar panel or solar array, municipal lighting, water meter, or other infrastructure; industrial automation and enterprise devices; consumer and wearable devices, such as eyewear, a wearable camera, a smart watch, a health or fitness tracker, a mammal implantable device, gesture tracking device, medical device, a digital audio player (e.g., MP3 player), a camera, a game console, etc.; and digital home or smart home devices such as a home audio, video, and multimedia device, an appliance, a sensor, a vending machine, intelligent lighting, a home security system, a smart meter, etc. In one aspect, a UE may be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, UEs that do not include UICCs may also be referred to as IoE devices. UEs 115a-115d of the implementation illustrated in FIG.1 are examples of mobile smart phone-type devices accessing wireless network 100 A UE may also be a machine specifically configured for connected communication, including machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. UEs 115e-115k illustrated in FIG. 1 are examples of various machines configured for communication that access wireless network 100.

[0043] A mobile apparatus, such as UEs 115, may be able to communicate with any type of the base stations, whether macro base stations, pico base stations, femto base stations, relays, and the like. In FIG.1, a communication link (represented as a lightning bolt) indicates wireless transmissions between a UE and a serving base station, which is a base station designated to serve the UE on the downlink or uplink, or desired transmission between base stations, and backhaul transmissions between base stations. UEs may operate as base stations or other network nodes in some scenarios. Backhaul communication QLXX.P2036WObetween base stations of wireless network 100 may occur using wired or wireless communication links.

[0044] In operation at wireless network 100, base stations 105a-105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. Macro base station 105d performs backhaul communications with base stations 105a-105c, as well as small cell, base station 105f. Macro base station 105d also transmits multicast services which are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

[0045] Wireless network 100 of implementations supports mission critical communications with ultra-reliable and redundant links for mission critical devices, such as UE 115e, which is a drone. Redundant communication links with UE 115e include from macro base stations 105d and 105e, as well as small cell base station 105f. Other machine type devices, such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device) may communicate through wireless network 100 either directly with base stations, such as small cell base station 105f, and macro base station 105e, or in multi-hop configurations by communicating with another user device which relays its information to the network, such as UE 115f communicating temperature measurement information to the smart meter, UE 115g, which is then reported to the network through small cell base station 105f. Wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD communications or low-latency FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with macro base station 105e.

[0046] FIG.2 is a block diagram illustrating examples of base station 105 and UE 115 according to one or more aspects. Base station 105 and UE 115 may be any of the base stations and one of the UEs in FIG.1. For a restricted association scenario (as mentioned above), base station 105 may be small cell base station 105f in FIG.1, and UE 115 may be UE 115c or 115d operating in a service area of base station 105f, which in order to access small cell base station 105f, would be included in a list of accessible UEs for small cell base station 105f. Base station 105 may also be a base station of some other type. As shown in FIG. 2, base station 105 may be equipped with antennas 234a through 234t, and UE 115 may be equipped with antennas 252a through 252r for facilitating wireless communications. QLXX.P2036WO

[0047] At base station 105, transmit processor 220 may receive data from data source 212 and control information from controller 240, such as a processor. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid-ARQ (automatic repeat request) indicator channel (PHICH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), an MTC physical downlink control channel (MPDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. Additionally, transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols, e.g., for the primary synchronization signal (PSS) and secondary synchronization signal (SSS), and cell-specific reference signal. Transmit (TX) MIMO processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, or the reference symbols, if applicable, and may provide output symbol streams to modulators (MODs) 232a through 232t. For example, spatial processing performed on the data symbols, the control symbols, or the reference symbols may include precoding. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may additionally or alternatively process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

[0048] At UE 115, antennas 252a through 252r may receive the downlink signals from base station 105 and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 115 to data sink 260, and provide decoded control information to controller 280, such as a processor.

[0049] On the uplink, at UE 115, transmit processor 264 may receive and process data (e.g., for a physical uplink shared channel (PUSCH)) from data source 262 and control information (e.g., for a physical uplink control channel (PUCCH)) from controller 280. Additionally, QLXX.P2036WOtransmit processor 264 may also generate reference symbols for a reference signal. The symbols from transmit processor 264 may be precoded by TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to base station 105. At base station 105, the uplink signals from UE 115 may be received by antennas 234, processed by demodulators 232, detected by MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 115. Receive processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller 240. Controllers 240 and 280 may direct the operation at base station 105 and UE 115, respectively. Controller 240 or other processors and modules at base station 105 or controller 280 or other processors and modules at UE 115 may initiate, perform, or control one or more operations described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink or the uplink.

[0050] In some cases, UE 115 and base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum. In an unlicensed frequency portion of the shared radio frequency spectrum band, UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum. For example, UE 115 or base station 105 may perform a listen-before-talk or listen-before-transmitting (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available. In some implementations, a CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter. A CCA also may include detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence. In some cases, an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel or the acknowledge / negative-acknowledge (ACK / NACK) feedback for its own transmitted packets as a proxy for collisions.

[0051] FIG. 3 is a block diagram illustrating an example wireless communication system 300 that supports FDRSB aware precoding according to some aspects. The wireless QLXX.P2036WOcommunication system 300 may include a UE 315 (such as the UE 115). The wireless communication system 300 may also include one or more network nodes, such as a network node 305. In some examples, the network node 305 may be implemented as a base station, such as the base station 105. To further illustrate, the network node 305 may be implemented as a base station, a network controller, an integrated access and backhauling (IAB) node, a distributed unit (DU), a central unit (CU), or a remote / radio unit (RU) (which may also be referred to as a remote radio unit (RRU)), as illustrative examples. A network node may also be referred to as a network entity.

[0052] The network node 305 may include one or more processors 302 (such as the controller 240), a memory 304 (such as the memory 242), a transmitter 306, and a receiver 308. The one or more processors 302 may be coupled to the memory 304, to the transmitter 306, and to the receiver 308. In some examples, the transmitter 306 and the receiver 308 may include one or more components described with reference to FIG.2, such as one or more of the modulator / demodulators 232a-t, the MIMO detector 236, the receive processor 238, the transmit processor 220, or the TX MIMO processor 230. In some examples, the one or more processors 302 may be configured to individually or collectively perform one or more operations described herein.

[0053] The transmitter 306 may transmit reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 308 may receive reference signals, control information, and data from one or more other devices. For example, in some implementations, the transmitter 306 may transmit signaling, control information, and data to the UE 315, and the receiver 308 may receive signaling, control information, and data from the UE 315.

[0054] The UE 315 may include one or more processors 352 (such as the controller 280), a memory 354 (such as the memory 282), a transmitter 356, and a receiver 358. The one or more processors 352 may be coupled to the memory 354, to the transmitter 356, and to the receiver 358. In some examples, the transmitter 356 and the receiver 358 may include one or more components described with reference to FIG.2, such as one or more of the modulator / demodulators 254a-r, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the TX MIMO processor 266. In some implementations, the transmitter 356 and the receiver 358 may be integrated in one or more transceivers of the UE 315. In some examples, the one or more processors 352 may be configured to individually or collectively perform one or more operations described herein. QLXX.P2036WO

[0055] The transmitter 356 may transmit reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 358 may receive reference signals, control information, and data from one or more other devices. For example, in some implementations, the transmitter 356 may transmit signaling, control information, and data to the network node 305, and the receiver 358 may receive signaling, control information, and data from the network node 305.

[0056] The wireless communication system 300 may use wireless communication channels, which may be specified by one or more wireless communication protocols, such as a 5G NR wireless communication protocol. To illustrate, the network node 305 may communicate with the UE 315 using one or more downlink wireless communication channels (such as via one or more of a PDSCH or a PDCCH). The UE 315 may communicate with the network node 305 using one or more uplink wireless communication channels (such as via one or more of a PUSCH or a PUCCH). Alternatively, or in addition, the UE 315 may communicate with one or more other UEs, such as via a sidelink wireless communication channel.

[0057] In some implementations, the UE 315 may supports FDRSB distortion reduction of received signals. For example, the UE 315 may include FDRSB distortion reduction circuitry 362 that supports canceling or reducing FDRSB distortion in received signals. For example, the FDRSB distortion reduction circuitry 362 may be configured to measure an amount of FDRSB distortion associated with a received signal (such as measuring an amount of signal components within sideband frequencies of the received signal) and to reduce or cancel the FDRSB distortion from the received signal (such as by attenuating or canceling the signal components within the sideband frequencies from the received signal).

[0058] In some other implementations, the UE 315 may not support FDRSB distortion reduction. In such examples, the UE 315 may not include the include FDRSB distortion reduction circuitry 362. To further illustrate, in some implementations, UEs associated with a first communication type may support FDRSB distortion reduction, and UEs of another communication type not support FDRSB distortion reduction. As an illustrative example, a UE that supports reduced capability (RedCap) communications may not support FDRSB distortion reduction in order to reduce power consumption. As another illustrative example, another type of UE, such as a “full capability” or “enhanced capability” UE, may support FDRSB distortion reduction in order to improve QLXX.P2036WOcommunication reliability. Alternatively, or in addition, a UE may support another communication type.

[0059] During operation, the UE 315 may transmit to the network node 305 a capability message 320. The UE 315 may transmit the capability message 320 via a medium access control (MAC) control element (MAC-CE), radio resource control (RRC) signaling, or other signaling, as illustrative examples. The capability message 320 may include an indication 322 of whether the UE 315 (or the receiver 358) supports FDRSB distortion reduction of received signals. For example, if the UE 315 includes the FDRSB distortion reduction circuitry 362, the indication 322 may specify that the UE 315 supports FDRSB distortion reduction. As another example, if the UE 315 does not include the FDRSB distortion reduction circuitry 362, the indication 322 may specify that the UE 315 does not support FDRSB distortion reduction. In some examples, the indication 322 may include or correspond to a flag (e.g., a bit) that can be set to a first value or a second value. The first value may indicate that the UE 315 supports FDRSB distortion reduction, and the second value may indicate that the UE 315 does not support FDRSB distortion reduction.

[0060] In some other implementations, the UE 315 may transmit the capability message 320 only if the UE 315 does (or does not) support FDRSB distortion reduction of received signals. For example, the UE 315 and the network node 305 may operate in accordance with a wireless communication protocol that specifies that the UE 315 is to provide the indication 322 to the network node 305 only if the UE 315 supports FDRSB distortion reduction. In another example, the wireless communication protocol that specifies that the UE 315 is to provide the indication 322 to the network node 305 only if the UE 315 does not support FDRSB distortion reduction.

[0061] In some implementations, the UE 315 may transmit to the network node 305 a power status message 324 indicating a power status 326 associated with the UE 315. For example, the power status 326 may indicate an estimated battery charge level associated with a battery of the UE 315. To further illustrate, in some examples, the power status 326 may have one of a first value (e.g., indicating a low battery charge level), a second value (e.g., indicating an intermediate battery charge level), or a third value (e.g., indicating a high battery charge level). In some other examples, the power status 326 may indicate a percentage charge level associated with the UE 315 (e.g., where a fifty percent charge level may indicate that a battery of the UE 315 is charged approximately halfway to capacity). In some examples, the UE 315 may transmit the power status message 324 via a PUCCH signal or via another signal. Further, although the example QLXX.P2036WOof FIG.3 illustrates that the UE 315 may transmit the indication 322 and the power status 326 via separate messages, in some other examples, the UE 315 may transmit the indication 322 and the power status 326 via a common message.

[0062] In some implementations, the UE 315 may transmit one or more of the capability message 320 or the power status message 324 to the network node 305 based on one or more trigger events. For example, in some implementations, the UE 315 may transmit one or more of the capability message 320 or the power status message 324 to the network node 305 during a session setup procedure with the network node 305 (e.g., during an attachment procedure) or upon handover to the network node 305. Alternatively, or in addition, the UE 315 may transmit the power status message 324 based on a change in power status associated with the UE 315 (e.g., due to battery use or due to battery charging).

[0063] The network node 305 may perform a precoder selection 332 to select a precoder among multiple precoders 310. The multiple precoders 310 may include a first precoder, such as an FDRSB aware precoder 312, and may further include a second precoder, such as a precoder 314 (e.g., a non-FDRSB-aware precoder). The network node 305 may perform the precoder selection 332 in accordance with one or more criteria. For example, the network node 305 may perform the precoder selection 332 in accordance with the indication 322. In some examples, the indication 322 may specify that the UE 315 does not support FDRSB distortion reduction, and the network node 305 may select the FDRSB aware precoder 312 in accordance with the indication 322 specifying that the UE 315 supports FDRSB distortion reduction. In some such examples, the network node 305 may select the FDRSB aware precoder 312 to compensate for the UE 315 not supporting FDRSB distortion reduction. In some other examples, the indication 322 may specify that the UE 315 supports FDRSB distortion reduction, and the network node 305 may select the precoder 314 in accordance with the indication 322 specifying that the UE 315 supports FDRSB distortion reduction. In some such examples, the UE 315 may use the FDRSB distortion reduction circuitry 362 to perform FDRSB distortion reduction (e.g., instead of relying on use of the FDRSB aware precoder 312 to reduce FDRSB distortion).

[0064] In some implementations, if the indication 322 specifies that the UE 315 supports FDRSB distortion reduction, the network node 305 may perform the precoder selection 332 according to one or more auxiliary criteria. To illustrate, in some scenarios, the network node 305 may select the FDRSB aware precoder 312 (instead of the precoder 314) to enable the UE 315 to avoid power consumption associated with operation of the FDRSB distortion reduction circuitry 362 (even if the UE 315 supports FDRSB distortion QLXX.P2036WOreduction). For example, the network node 305 may perform the precoder selection 332 according to the power status 326. To illustrate, in some examples, the UE 315 may indicate (e.g., via the indication 322) support of FDRSB distortion reduction and may also indicate (e.g., via the power status 326) a relatively low battery level, such as a first battery level that fails to exceed a battery level threshold. In some such examples, the network node 305 may select the FDRSB aware precoder 312 (e.g., instead of the precoder 314) in order to avoid increasing power consumption associated with operation of the FDRSB distortion reduction circuitry 362. In some other examples, the UE 315 may indicate (e.g., via the indication 322) support of FDRSB distortion reduction and may also indicate (e.g., via the power status 326) a greater battery level, such as a second battery level that exceeds the battery level threshold. In some such examples, the network node 305 may select the precoder 314 (e.g., instead of the FDRSB aware precoder 312 ) to facilitate enhanced signal reception associated with FDRSB distortion reduction performed by the UE 315.

[0065] Alternatively or in addition to the power status 326, the one or more auxiliary criteria may include one or more other criteria. For example, the network node 305 may perform the precoder selection 332 in accordance with an FDRSB distortion measurement 301 associated with the network node 305. The FDRSB distortion measurement 301 may indicate an amount of FDRSB distortion associated with the network node 305, such as an amount of FDRSB distortion produced by circuitry of the transmitter 306 during transmission of signals. Depending on the implementation, the FDRSB distortion measurement 301 may be performed using hardware of the network node 305 (such as a feedback chain or comparator that compares upconverter inputs and outputs), using external equipment (such as a spectrum analyzer), using one or more other techniques, or a combination thereof.

[0066] In some examples, the network node 305 may select (or may be more likely to select) the FDRSB aware precoder 312 (instead of the precoder 314) based on the FDRSB distortion measurement 301 being relatively large (e.g., exceeding an FDRSB distortion threshold). To illustrate, in some examples, the UE 315 may indicate (e.g., via the indication 322) support of FDRSB distortion reduction, and the FDRSB distortion measurement 301 may indicate a relatively low amount of FDRSB distortion, such as a first FDRSB distortion that fails to exceed the FDRSB distortion threshold. In some such examples, the network node 305 may select the precoder 314 (instead of the FDRSB aware precoder 312) in order to avoid power consumption associated with operation of the FDRSB distortion QLXX.P2036WOreduction circuitry 362, which may be unnecessary or undesirable when the amount of FDRSB distortion is relatively low. In some other examples, the UE 315 may indicate (e.g., via the indication 322) support of FDRSB distortion reduction, and the FDRSB distortion measurement 301 may indicate a greater amount of FDRSB distortion, such as a second FDRSB distortion that exceeds the FDRSB distortion threshold. In some such examples, the network node 305 may select the FDRSB aware precoder 312 (e.g., instead of the precoder 314) to facilitate enhanced signal reception associated with FDRSB distortion reduction by the UE 315.

[0067] Although the previous example is described with reference to the FDRSB distortion measurement 301, other examples are also within the scope of the disclosure. For example, the network node 305 may determine a metric based on the FDRSB distortion measurement 301 and may perform the precoder selection 332 based on the metric. In some examples, the metric may correspond to an FDRSB floor metric. The FDRSB floor metric may be determined based on subtracting the FDRSB distortion measurement 301 from a thermal noise level, which may be indicated by the UE 315 to the network node 305, such as via a channel state information (CSI) report. In some implementations, the network node 305 may select the FDRSB aware precoder 312 if the FDRSB floor metric exceeds an FDRSB floor threshold or may select the precoder 314 if the FDRSB floor metric fails to exceed FDRSB floor threshold.

[0068] In some examples, the network node 305 may perform (or reperform) the FDRSB distortion measurement 301 based on detecting that one or more FDRSB distortion measurement criteria 303 are satisfied. In some examples, the network node 305 may perform (or reperform) the FDRSB distortion measurement 301 during a factory calibration phase, during a session setup procedure with the UE 315, in accordance with a temperature associated with the network node or a change in the temperature, in accordance with a hardware reconfiguration associated with the network node (e.g., a change in one or more transmit antennas), in accordance with expiration of a time interval (e.g., where the time interval corresponds to a particular quantity of time slots), or during an offline learning stage (e.g., where the offline learning stage includes determining one or more of the temperature, the change in temperature, or the quantity of time slots). As an illustrative example, a change in ambient temperature (e.g., since performing a previous FDRSB distortion measurement 301) may be associated with a change in the FDRSB distortion measurement 301. As a result, the network node 305 may monitor ambient temperature and may reperform the FDRSB distortion measurement 301 based QLXX.P2036WOon detecting a change in the ambient temperature exceeding a temperature change threshold. In such examples, the one or more FDRSB distortion measurement criteria 303 may include detection of a change in ambient temperature that exceeds the temperature change threshold. Other examples are also within the scope of the disclosure.

[0069] The network node 305 may transmit one or more configuration messages 330 to the UE 315 indicating the precoder selection 332 (or the result of the precoder selection 332). The UE 315 may receive the one or more configuration messages 330. In some implementations, the UE 315 may perform one or more operations based on the precoder selection 332. To illustrate, in accordance with the precoder selection 332 indicating selection of the FDRSB aware precoder 312, the UE 315 may deactivate (e.g., power down) the FDRSB distortion reduction circuitry 362 if the FDRSB distortion reduction circuitry is in an active state (e.g., powered up). In another example, in accordance with the precoder selection 332 indicating selection of the precoder 314, the UE 315 may activate (e.g., power up) the FDRSB distortion reduction circuitry 362 if the FDRSB distortion reduction circuitry is in the inactive state (e.g., a standby mode).

[0070] The network node 305 may transmit a signal 340 (e.g., a downlink signal) to the UE 315 in accordance with the precoder selection 332. For example, the network node 305 may precode the signal 340 using the FDRSB aware precoder 312 in accordance with the precoder selection 332 indicating the FDRSB aware precoder 312. As another example, the network node 305 may precode the signal 340 using the precoder 314 in accordance with the precoder selection 332 indicating the precoder 314.

[0071] The UE 315 may receive the signal 340 in accordance with the precoder selection 332. In some examples, the UE 315 may receive the signal 340 without performing FDRSB distortion reduction. To illustrate, the UE 315 may not support FDRSB distortion reduction (e.g., where the UE 315 does not include FDRSB distortion reduction circuitry 362). In such examples, the network node 305 may precode the signal 340 using the FDRSB aware precoder 312, and the UE 315 may receive the signal 340 without performing FDRSB distortion reduction. In some other examples, the UE 315 may support FDRSB distortion reduction, the network node 305 may precode the signal 340 using the precoder 314, and the UE 315 may receive the signal 340 using FDRSB distortion reduction (e.g., via the FDRSB distortion reduction circuitry 362). In some additional examples, the UE 315 may support FDRSB distortion reduction, the network node 305 may precode the signal 340 using the FDRSB aware precoder 312 (e.g., based on one or more of the power status 326 or the FDRSB distortion measurement 301, such QLXX.P2036WOas described above), and the UE 315 may receive the signal 340 without performing FDRSB distortion reduction (e.g., to avoid power consumption associated with operation of the FDRSB distortion reduction circuitry 362).

[0072] The UE 315 may determine whether to use (or not use) the FDRSB distortion reduction circuitry 362 to receive the signal 340 in accordance with one or more criteria. To illustrate, after transmitting the capability message 320 and prior to receiving the signal 340, the UE 315 may receive an FDRSB power estimate message 334 from the network node 305 indicating an estimated amount of FDRSB power 336 associated with the signal 340. The UE 315 may perform a determination of whether the estimated amount of FDRSB power 336 exceeds an FDRSB power threshold 360 and may receive the signal 340 in accordance with the determination. For example, if the estimated amount of FDRSB power 336 exceeds the FDRSB power threshold 360, the UE 315 may receive the signal 340 using FDRSB distortion reduction, such as by demodulating the signal 340 using the FDRSB distortion reduction circuitry 362. As another example, if the estimated amount of FDRSB power 336 fails to exceed the FDRSB power threshold 360, the UE 315 may receive the signal 340 without using FDRSB distortion reduction, such as by operating the FDRSB distortion reduction circuitry 362 in a standby or inactive mode while receiving the signal 340.

[0073] In some examples, the network node 305 may report the estimated amount of FDRSB power 336 based on the precoder selection 332. For example, if the signal 340 is to be precoded using the precoder 314, the estimated amount of FDRSB power 336 may be reported per frequency for multiple frequencies (since for example FDRSB power may vary based on frequency when the signal 340 is precoded using the precoder 314, as described further with reference to FIG.4). As another example, if the signal 340 is to be precoded using the FDRSB aware precoder 312, the estimated amount of FDRSB power 336 may be reported using a single value (since for example FDRSB power may be constant or substantially constant for different frequencies when the signal 340 is precoded using the FDRSB aware precoder 312, as described further with reference to FIG.4).

[0074] Alternatively or in addition to using the estimated amount of FDRSB power 336, the UE 315 may determine whether to use the FDRSB distortion reduction circuitry 362 to receive the signal 340 based on one or more other metrics. To illustrate, in some scenarios, the UE 315 may use the FDRSB distortion reduction circuitry 362 to receive the signal 340 based on determining that an error metric associated with the signal 340 QLXX.P2036WO(e.g., an error magnitude vector) exceeds an error threshold. In some other scenarios, the UE 315 may receive the signal 340 without using the FDRSB distortion reduction circuitry 362 based on determining that the error metric fails to exceed the error threshold. Alternatively, or in addition, the UE 315 may use the FDRSB distortion reduction circuitry 362 to receive the signal 340 based on determining that an FDRSB floor metric exceeds an FDRSB floor threshold. In some other scenarios, the UE 315 may receive the signal 340 without using the FDRSB distortion reduction circuitry 362 based on determining that the FDRSB floor metric fails to exceed the FDRSB floor threshold.

[0075] In some cases, the network node 305 may change among the multiple precoders 310 during a communication session with the UE 315, such as in response to a change in the power status 326 reported by the UE 315 or in response to one or more other events. For example, after transmitting the signal 340 using one of the multiple precoders 310, the network node 305 may transmit another signal using another one of the multiple precoders 310. In such cases, the network node 305 may transmit to the UE 315 an update of the precoder selection 332 to indicate the change of precoder.

[0076] In some examples, the signal 340 may include or correspond to a downlink signal, such as a physical downlink shared channel (PDSCH) signal or a physical downlink control channel (PDCCH) signal. Other examples are also within the scope of the disclosure. For example, in some implementations, the UE 315 may precode an uplink signal using an FDRSB aware precoder, and the network node 305 may receive the uplink signal using FDRSB distortion reduction. The uplink signal may correspond to a physical uplink shared channel (PUSCH) signal or a physical uplink control channel (PUCCH) signal, as illustrative examples. Further, in some implementations, the UE 315 may precode a sidelink signal using an FDRSB aware precoder, and another UE may receive the sidelink signal using FDRSB distortion reduction. The sidelink signal may correspond to a physical sidelink shared channel (PSSCH) signal, a physical sidelink control channel (PSCCH) signal, or a physical sidelink feedback channel (PSFCH) signal, as illustrative examples. Accordingly, although some examples have been described herein with reference to signaling from the network node 305 to the UE 315 (or vice versa), such examples are also applicable to signaling from the UE 315 to the network node 305 (or vice versa) and to signaling from the UE 315 to another UE (or vice versa).

[0077] In some implementations, the UE 315 may transmit a request to the network node 305 requesting use of the FDRSB aware precoder 312. For example, instead of transmitting the capability message 320 and the power status message 324, the UE 315 may transmit QLXX.P2036WOthe request to the network node 305 to request use of the FDRSB aware precoder 312. In some examples, the request may include or may correspond to a flag (e.g., a bit) having one of a first value requesting the FDRSB aware precoder 312 or a second value requesting the precoder 314. Further, in some examples, the UE 315 may set the flag based on one or more of the FDRSB distortion reduction capability of the UE 315, the power status 326, or the estimated amount of FDRSB power 336.

[0078] FIG.4 illustrates an example of a graph 400 depicting some example aspects of FDRSB aware precoding according to some aspects. In the example of FIG.4, the abscissa may indicate frequency of the signal 340, which may be measured in megahertz (MHz), and the ordinate may indicate a signal to FDRSB noise ratio (SFNR) associated with a received version of the signal 340, which may be measured in decibels (dB). It is noted that the example of FIG. 4 is provided for illustration and that other examples are also within the scope of the disclosure. Accordingly, the example depicted in FIG. 4 is illustrative and non-limiting.

[0079] In FIG 4, the FDRSB aware precoder 312 may be associated with a flat or approximately flat average SFNR, and the precoder 314 may be associated with a substantially non-flat SFNR. For example, an average SFNR 402 of the signal 340 when precoded using the FDRSB aware precoder 312 may have a first slope, and an average SFNR 404 of the signal 340 when precoded using the precoder 314 may have a second slope that is less than the first slope. In some examples, the first slope may be zero or approximately zero, and the second slope may be negative. As a result, use of the FDRSB aware precoder 312 may enable an improved (e.g., more balanced) SFNR as compared to use of the precoder 314.

[0080] To further illustrate some aspects of the disclosure, in some implementations, an FDRSB impaired signal may be represented as ^^^^^^^^^ௗ^^^^and may be expressed usingEquation 1: ^^^^^^^^^ௗ^^^^ ൌ ^^^^^^ ^ ^^^^^^ ⋅ ^^∗^െ^^^ (Equation 1).

[0081] The FDRSB impaired signal may correspond to the signal 340 prior to (or without) precoding using the FDRSB aware precoder 312. In some examples, the FDRSB impaired signal ^^^^^^^^^ௗ^^^^may correspond to the signal 340 after precoding.QLXX.P2036WOFurther, ^^ may represent frequency, ^^^^^^ may represent an amount of FDRSB impairment associated with the signal 340, and ^^(^^) = ^^(^^)^^(^^) may represent the signal 340 after precoding, where ^^(^^) may represent the precoder, and where ^^(^^) may represent data to be transmitted via the signal 340. In addition, * may represent a complex conjugate operator.

[0082] The amount of FDRSB impairment may also be represented aswheremay indicate a first parameter (e.g., a phase) associated with an in-phase (I)component of the signal 340, and where ^^ଶ^^^^ may indicate a second parameter (e.g., a phase) associated with quadrature (Q) component of the signal 340. In some circumstances, the first parameter may differ from the second parameter, resulting in FDRSB impairment. To illustrate, a modulator of the transmitter 306 may include an I mixer and a Q mixer. A lack of synchronization between the I mixer and the Q mixer may cause the first parameter to differ from the second parameter, resulting in the FDRSB impairment.

[0083] Equation 1 may also be expressed as Equation 2:(Equation 2).

[0084] An SFNR associated with the FDRSB impaired signal may be represented as ^^^^^^^^^^^^and may be expressed using Equation 3:

[0085] In Equation 3, ^^௫ଶmay represent a variance associated with ^^(^^). To reduce FDRSB impairment, precoding of the signal 340 may be used to balance the SFNR at a frequency and a mirror frequency of the frequency (e.g., the frequency multiplied by negative one), such as in accordance with Equation 4: ^^^^^^^^^^^^ ൌ|^^^^^^||^^^^^^ ⋅ ^^∗^െ^^^|QLXX.P2036WOൌ ^^^^^^^^^െ^^^ (Equation 4).

[0086] As a result, precoding of the signal 340 may be performed in accordance with Equation 5: |^^^^|మ^ ^ |^^ି^^|మൌ ^ థ^ థ^ି^^^ ∀^^ (Equation 5).

[0087] After precoding the signal 340 in accordance with Equation 5, each pair of frequency (e.g., a frequency and a mirror frequency of the frequency, such as the frequency multiplied by negative one) may be balanced, and each pair of precoder bins ^^^^^^and ^^^െ^^^may result in Equation 6:(Equation 6)

[0088] In Equation 6, ^^^^^^^^^^^^ may be symmetric (or approximately symmetric) for different frequencies, but may be non-constant for different frequencies. In some implementations, a gain stage may be used to increase balance of ^^^^^^^^^^^^ for different frequencies (e.g., by enabling a constant or near-constant SFNR for a range of frequencies). In some other implementations, the gain stage may be omitted. The gain stage may operate in accordance with Equation 7: ^^^^^^௧^^௧ೄಷಿೃ^^^^ ൌ ^^^^^^ ∙ ^^^^^^ (Equation 7).

[0089] In Equation 7, c^f^ may represent the gain stage (e.g., a set of coefficients of the gain stage). Alternatively or in addition to use of the gain stage, a transmitter may operate according to Equation 8, where each precoder bin may be multiplied by a value. The value may be a real scalar value that is common to each precoder bin. The value may be indicated as ^^^^^^Use of the value may increase balance of ^^^^^^^^^^^^ withinQLXX.P2036WOthe frequency domain (e.g., by enabling a constant or near-constant SFNR for a range of frequencies), such as is indicated by Equation 8: ^^^^^^^^^^^^ ൌ const ∀^^ (Equation 8).

[0090] The precoder described with reference to Equation 8 may correspond to the FDRSB aware precoder 312. For example, after multiplying each precoder bin by the value (^^^^^^ ൌ^^^െ^^^), the precoder may increase balance of FDRSB among a range of frequencies, such as illustrated in the example of FIG. 4 (e.g., as described with reference to the average SFNR 402 of the signal 340 when precoded using the FDRSB aware precoder 312). As a result, implementing the FDRSB aware precoder 312 in accordance with Equations 1-8 may improve performance within the wireless communication system 300 when precoding the signal 340 using the FDRSB aware precoder 312.

[0091] In addition, the FDRSB distortion reduction circuitry 362 may be implemented using one or more techniques to enable the UE 315 to reduce FDRSB distortion that may be associated with the signal 340. In some implementations, a received version of the signal 340 received by the UE 315 may be indicated as y^f^ and may be expressed using Equation 9:(Equation 9).

[0092] In Equation 9, .* may represent a Hadamard multiplication operator (also referred to as an element-wise multiplication operator). ^^^^^^may represent a channel used to transmit the signal 340. Equation 9 may also be expressed as Equation 10:ൌ^diagି^൫^^^^^^^൯diag൫^^ଶ^^^^൯^^∗^െ^^^^ ^ ^^^^^^QLXX.P2036WOభ

[0093] In Equation 9, ^^^^^^ may indicate a noise component or other parameter associated with the received version of the signal 340. The UE 315 may estimate the amount of FDRSB impairment, such as in accordance with Equation 11: ൌ→^^^^ௌ^^^^ ൌ ^^^^^^^ு^^^^^^^ି^^^^^^^ு^^^^^^ (Equation 11).

[0094] Further,may remain constant or approximately constant for a particular N of subcarriers (SCs), which may be represented using Equation 12 and Equations 13:(Equation 12)QLXX.P2036WO

[0095] After the averaging, an interpolation over the SCs may be performed to estimate the FDRSB curve in each SC. After estimating the FDRSB curve, the UE 315 may remove the FDRSB influence (correction step) by using the estimated ^^^^^^ , such as inaccordance with Equations 14:

[0096] In Equations 14, ^^^^^^may indicate a first received version of the signal 340 prior toperforming FDRSB distortion reduction, and ^^^^^^^^௧^ௗ^^^^may indicate a secondreceived version of the signal 340 after performing FDRSB distortion reduction. In Equations 14, estimation_error may indicate an error metric associated with one or more operations, such as channel estimation, FDRSB distortion reduction, one or more other operations, or a combination thereof. Accordingly, in some implementations, the FDRSB distortion reduction circuitry 362 may be configured to reduce or cancel FDRSB distortion in the signal 340 by removing (or reducing)in the signal 340, such asin accordance with Equations 14.

[0097] One or more features described herein may improve performance within the wireless communication system 300. For example, by selecting among the multiple precoders 310, the network node 305 may enable FDRSB reduction while also facilitating enhanced performance in the wireless communication system 300 (e.g., by conserving power at the network node 305, at the UE 315, or both). For example, in some scenarios, the network QLXX.P2036WOnode 305 may use the FDRSB aware precoder 312 to perform FDRSB reduction at the network node 305, such as in response to one or more of the UE 315 not supporting UE- side FDRSB reduction, the UE 315 being associated with a relatively low battery charge, or an amount of FDRSB distortion being relatively large. In some other scenarios, the network node 305 may select the precoder 314 and may “offload” or “delegate” to the UE 315 the decision of whether to use FDRSB distortion reduction, such as in response to one or more of the UE 315 supporting UE-side FDRSB reduction, the UE 315 being associated with a relatively high battery charge, or an amount of FDRSB distortion being relatively low. As a result, FDRSB distortion reduction is enabled for a variety of circumstances, including for UEs that support UE-side FDRSB reduction as well as for UEs that do not support UE-side FDRSB reduction.

[0098] To further illustrate, by reducing variability in SFNR (such as illustrated in the example of FIG. 4), performance may be improved in the wireless communication system 300. For example, in some wireless communication protocols, a modulation and coding scheme (MCS) may be based on, or may be affected by, the “worst case” SFNR. In such cases, larger variability in SFNR may limit the MCS or range of MCSs available to transmit data. By reducing variability in SFNR (e.g., by balancing, smoothing, or flattening SFNR for a range of frequencies), instances of such “worst case” SFNR may be reduced or eliminated, which may facilitate use of a greater range of MCSs to transmit data.

[0099] FIG.5 is a flow diagram illustrating an example process 500 that supports FDRSB aware precoding according to one or more aspects. In some examples, a UE (e.g., the UE 315) may perform the process 500 to communicate with a network node, such as the network node 305. In some other examples, the network node may perform the process 500 to communicate with the UE. In some additional examples, the UE may perform the process 500 to communicate with another UE.

[0100] The process 500 includes transmitting a capability message that includes an indication of whether a device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals, at 502. For example, the UE 315 may transmit the capability message 320 including the indication 322 of whether the UE 315 supports FDRSB distortion reduction. In such examples, the device described with reference to the process 500 may correspond to the UE 315. In some other examples, the device may correspond to another entity, such as the network node 305 (e.g., where the network node 305 performs the process 500). QLXX.P2036WO

[0101] The process 500 further includes receiving a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder, at 504. For example, the UE 315 may receive the signal 340, and the signal 340 may be precoded, in accordance with the indication 322, with one of the FDRSB aware precoder 312 or the precoder 314.

[0102] FIG.6 is a flow diagram illustrating another example process 600 that supports FDRSB aware precoding according to one or more aspects. In some examples, a network node (e.g., the network node 305) may perform the process 600 to communicate with a UE (e.g., the UE 315). In some other examples, the UE may perform the process 600 to communicate with the network node or with another UE.

[0103] The process 600 includes receiving a capability message that includes an indication of whether a device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals, at 602. For example, the network node 305 may receive the capability message 320 including the indication 322 of whether the UE 315 supports FDRSB distortion reduction. In such examples, the device described with reference to the process 600 may correspond to the UE 315. In some other examples, the device may correspond to another entity, such as the network node 305 (e.g., where the UE 315 performs the process 600).

[0104] The process 600 further includes transmitting a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder, at 604. For example, network node 305 may transmit the signal 340, and the signal 340 may be precoded, in accordance with the indication 322, with one of the FDRSB aware precoder 312 or the precoder 314.

[0105] FIG.7 is a block diagram of an example UE 315 that supports FDRSB aware precoding according to one or more aspects. The UE 315 may include structure, hardware, or components illustrated in FIG.2, FIG.3, or both. For example, the UE 315 may include the controller 280, which may execute instructions stored in the memory 282. Using the controller 280, the UE 315 may transmit and receive signals via wireless radios 701a-r and antennas 252a-r. The wireless radios 701a-r may include one or more components or devices described herein, such as the modulator / demodulators 254a-r, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO QLXX.P2036WOprocessor 266, the transmitter 356, the receiver 358, one or more other components or devices, or a combination thereof.

[0106] In some examples, the memory 282 may store instructions executable by one or more processors (e.g., the controller 280) to initiate, perform, or control one or more operations described herein. For example, the memory 282 may store FDRSB distortion reduction mode selection instructions 702 executable by the controller 280 to determine whether to use the FDRSB distortion reduction circuitry 362 to perform FDRSB distortion reduction of one or more received signals, such as the signal 340. In some examples, the UE 315 may perform the determination based on a comparison of the estimated amount of FDRSB power 336 to the FDRSB power threshold 360. As another example, the memory 282 may store FDRSB distortion reduction instructions 704 executable by the controller 280 to initiate, perform, or control FDRSB distortion reduction, such as by setting a value of a control signal to the FDRSB distortion reduction circuitry 362. The control signal may have a first value to activate the FDRSB distortion reduction circuitry 362 (e.g., to receive the signal 340 using FDRSB distortion reduction) or a second value to deactivate the FDRSB distortion reduction circuitry 362 (e.g., to receive the signal 340 without FDRSB distortion reduction).

[0107] FIG.8 is a block diagram of an example network node 305 that supports FDRSB aware precoding according to one or more aspects. The network node 305 may include structure, hardware, and components illustrated in FIG.2, FIG.3, or both. For example, the network node 305 may include the controller 240, which may execute instructions stored in memory 242. Under control of the controller 240, the network node 305 may transmit and receive signals via wireless radios 801a-t and antennas 234a-t. The wireless radios 801a-t may include one or more components or devices described herein, such as the modulator / demodulators 232a-t, the MIMO detector 236, the receive processor 238, the transmit processor 220, the TX MIMO processor 230, one or more other components or devices, or a combination thereof.

[0108] In some examples, the memory 242 may store instructions executable by one or more processors (e.g., the controller 240) to initiate, perform, or control one or more operations described herein. For example, the memory 242 may store precoder selection instructions 802 executable by the controller 240 to select among the multiple precoders 310, such as in accordance with the indication 322 of FIG.3. As another example, the memory 242 may store FDRSB distortion measurement instructions 804 executable by the controller 240 to initiate, perform, or control performing the FDRSB distortion measurement 301, QLXX.P2036WOsuch as in accordance with the one or more FDRSB distortion measurement criteria 303 of FIG.3.

[0109] According to some further examples, in a first aspect, an apparatus for wireless communication includes a receiver and a transmitter. The transmitter is configured to transmit a capability message that includes an indication of whether the receiver supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals. The receiver is configured to receive a signal that is precoded, in accordance with at least the indication of whether the receiver supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

[0110] In a second aspect, in combination with the first aspect, the first precoder corresponds to an FDRSB aware precoder, and the second precoder corresponds to a non-FDRSB-aware precoder.

[0111] In a third aspect, in combination with one or more of the first aspect or the second aspect, the indication specifies that the receiver supports the FDRSB distortion reduction, and the receiver includes FDRSB distortion reduction circuitry configured to apply the FDRSB distortion reduction to the signal.

[0112] In a fourth aspect, in combination with one or more of the first aspect through the third aspect, the indication specifies that the receiver does not support the FDRSB distortion reduction, and the receiver is further configured to receive the signal without applying the FDRSB distortion reduction to the signal.

[0113] In a fifth aspect, in combination with one or more of the first aspect through the fourth aspect, the receiver is further configured to receive, after transmission of the capability message and prior to receiving the signal, a configuration message indicating a precoder selection of one of the first precoder or the second precoder, and the signal is received in accordance with the precoder selection.

[0114] In a sixth aspect, in combination with one or more of the first aspect through the fifth aspect, the transmitter is further configured to transmit a power status message indicating a power status associated with the apparatus, and the signal is precoded with one of the first precoder or the second precoder further in accordance with the power status message.

[0115] In a seventh aspect, in combination with one or more of the first aspect through the sixth aspect, the receiver is further configured to receive, after transmission of the capability message and prior to receiving the signal, an FDRSB power estimate message indicating an estimated amount of FDRSB power associated with the signal and to receive the signal QLXX.P2036WOin accordance with a determination of whether the estimated amount of FDRSB power exceeds an FDRSB power threshold.

[0116] In an eighth aspect, in combination with one or more of the first aspect through the seventh aspect, the estimated amount of FDRSB power exceeds the FDRSB power threshold, and the receiver is further configured to receive the signal using the FDRSB distortion reduction.

[0117] In a ninth aspect, in combination with one or more of the first aspect through the eighth aspect, the estimated amount of FDRSB power fails to exceed the FDRSB power threshold, and the receiver is further configured to receive the signal without using the FDRSB distortion reduction.

[0118] In a tenth aspect, a method of wireless communication performed by a device includes transmitting a capability message that includes an indication of whether the device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals. The method further includes receiving a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

[0119] In an eleventh aspect, in combination with the tenth aspect, the indication specifies that the device supports the FDRSB distortion reduction, and receiving the signal includes applying the FDRSB distortion reduction to the signal using FDRSB distortion reduction circuitry of the device.

[0120] In a twelfth aspect, in combination with one or more of the tenth aspect through the eleventh aspect, the indication specifies that the device does not support the FDRSB distortion reduction, and the signal is received without applying the FDRSB distortion reduction to the signal.

[0121] In a thirteenth aspect, in combination with one or more of the tenth aspect through the twelfth aspect, the method further includes, after transmitting the capability message and prior to receiving the signal, receiving a configuration message indicating a precoder selection of one of the first precoder or the second precoder, and the signal is received in accordance with the precoder selection.

[0122] In a fourteenth aspect, in combination with one or more of the tenth aspect through the thirteenth aspect, the method further includes transmitting a power status message indicating a power status of the device, and the signal is precoded with one of the first precoder or the second precoder further in accordance with the power status message. QLXX.P2036WO

[0123] In a fifteenth aspect, in combination with one or more of the tenth aspect through the fourteenth aspect, the method further includes, after transmitting the capability message and prior to receiving the signal, receiving an FDRSB power estimate message indicating an estimated amount of FDRSB power associated with the signal. The method further includes performing a determination of whether the estimated amount of FDRSB power exceeds an FDRSB power threshold. The signal is received in accordance with the determination.

[0124] In a sixteenth aspect, in combination with one or more of the tenth aspect through the fifteenth aspect, the estimated amount of FDRSB power exceeds the FDRSB power threshold, and the signal is received using the FDRSB distortion reduction.

[0125] In a seventeenth aspect, in combination with one or more of the tenth aspect through the sixteenth aspect, the estimated amount of FDRSB power fails to exceed the FDRSB power threshold, and the signal is received without using the FDRSB distortion reduction.

[0126] In an eighteenth aspect, an apparatus for wireless communication includes a receiver configured to receive a capability message that includes an indication of whether a device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals. The apparatus further includes a transmitter configured to transmit a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

[0127] In a nineteenth aspect, in combination with the eighteenth aspect, the transmitter is further configured to transmit a configuration message indicating a precoder selection of one of the first precoder or the second precoder in accordance with an FDRSB distortion measurement.

[0128] In a twentieth aspect, in combination with one or more of the eighteenth aspect through the nineteenth aspect, the FDRSB distortion measurement is associated with at least one of a factory calibration phase, a session setup procedure with the device, a temperature associated with the apparatus, a change in the temperature, a hardware reconfiguration associated with the apparatus, expiration of a time interval, or an offline learning stage.

[0129] Those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, QLXX.P2036WOelectromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0130] One or more components, functional blocks, and modules described herein may include processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, among other examples, or any combination thereof. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. In addition, features discussed herein may be implemented via processor circuitry, via executable instructions, or combinations thereof.

[0131] Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and operations described herein may be implemented as electronic hardware, computer software, or combinations of both. To illustrate, various illustrative components, blocks, modules, circuits, and operations have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software may depend upon the particular application and design of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Skilled artisans will also readily recognize that the order or combination of components, methods, or interactions that are described herein are illustrative and that the components, methods, or interactions of the various aspects of the disclosure may be combined or performed in ways other than those illustrated and described herein.

[0132] A hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a single- or multi-chip processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A processor may be a microprocessor, controller, microcontroller, state machine, or other type of processor. In some implementations, a processor may be implemented as a combination of computing devices, such as a QLXX.P2036WOcombination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some implementations, particular processes and methods may be performed by circuitry that is specific to a given function.

[0133] In one or more aspects, the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents thereof, or in any combination thereof. Implementations of the subject matter described in this specification also may be implemented as one or more computer programs, that is one or more modules of computer program instructions, encoded on a computer storage media for execution by, or to control the operation of, a data processing apparatus.

[0134] If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. The processes of a method or process disclosed herein may be implemented in a processor-executable software module which may reside on a computer-readable medium. Computer-readable media includes computer storage media. A storage media may be any available media that may be accessed by a computer. By way of example, and not limitation, such computer- readable media may include random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures and that may be accessed by a computer. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, the operations of a method or process may reside as one or any combination or set of codes and instructions on a machine readable medium and computer-readable medium, which may be incorporated into a computer program product.

[0135] Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to some other implementations without departing from the spirit or scope of this disclosure. Thus, the claims are not intended to be limited to the implementations shown QLXX.P2036WOherein, but are to be accorded the widest scope consistent with this disclosure, the principles and the novel features disclosed herein.

[0136] Additionally, a person having ordinary skill in the art will readily appreciate, the terms “upper” and “lower” are sometimes used for ease of describing the figures, and indicate relative positions corresponding to the orientation of the figure on a properly oriented page, and may not reflect the proper orientation of any device as implemented.

[0137] Certain features that are described in this specification in the context of separate implementations also may be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation also may be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination may in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

[0138] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Further, the drawings may schematically depict one more example processes in the form of a flow diagram. However, other operations that are not depicted may be incorporated in the example processes that are schematically illustrated. For example, one or more additional operations may be performed before, after, simultaneously, or between any of the illustrated operations. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems may be integrated together in a single software product or packaged into multiple software products. Additionally, some other implementations are within the scope of the following claims. In some cases, the actions recited in the claims may be performed in a different order and still achieve desirable results.

[0139] As used herein, including in the claims, the term “or,” when used in a list of two or more items, means that any one of the listed items may be employed by itself, or any combination of two or more of the listed items may be employed. For example, if a composition is described as containing components A, B, or C, the composition may QLXX.P2036WOcontain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of” indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (that is A and B and C) or any of these in any combination thereof. The term “substantially” is defined as largely but not necessarily wholly what is specified (and includes what is specified; for example, substantially 90 degrees includes 90 degrees and substantially parallel includes parallel), as understood by a person of ordinary skill in the art. In any disclosed implementations, the term “substantially” may be substituted with “within [a percentage] of” what is specified, where the percentage includes .1, 1, 5, or 10 percent.

[0140] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. QLXX.P2036WO

Claims

CLAIMS WHAT IS CLAIMED IS:

1. An apparatus for wireless communication, the apparatus comprising: a receiver; and a transmitter configured to transmit a capability message that includes an indication of whether the receiver supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals, the receiver being configured to receive a signal that is precoded, in accordance with at least the indication of whether the receiver supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

2. The apparatus of claim 1, wherein the first precoder corresponds to an FDRSB aware precoder, and wherein the second precoder corresponds to a non- FDRSB-aware precoder.

3. The apparatus of claim 1, wherein the indication specifies that the receiver supports the FDRSB distortion reduction, and wherein the receiver includes FDRSB distortion reduction circuitry configured to apply the FDRSB distortion reduction to the signal.

4. The apparatus of claim 1, wherein the indication specifies that the receiver does not support the FDRSB distortion reduction, and wherein the receiver is further configured to receive the signal without applying the FDRSB distortion reduction to the signal.

5. The apparatus of claim 1, wherein the receiver is further configured to receive, after transmission of the capability message and prior to receiving the signal, a configuration message indicating a precoder selection of one of the first precoder or the second precoder, and wherein the signal is received in accordance with the precoder selection. QLXX.P2036WO6. The apparatus of claim 1, wherein the transmitter is further configured to transmit a power status message indicating a power status associated with the apparatus, and wherein the signal is precoded with one of the first precoder or the second precoder further in accordance with the power status message.

7. The apparatus of claim 1, wherein the receiver is further configured to: receive, after transmission of the capability message and prior to receiving the signal, an FDRSB power estimate message indicating an estimated amount of FDRSB power associated with the signal; and receive the signal in accordance with a determination of whether the estimated amount of FDRSB power exceeds an FDRSB power threshold.

8. The apparatus of claim 7, wherein the estimated amount of FDRSB power exceeds the FDRSB power threshold, and wherein the receiver is further configured to receive the signal using the FDRSB distortion reduction.

9. The apparatus of claim 7, wherein the estimated amount of FDRSB power fails to exceed the FDRSB power threshold, and wherein the receiver is further configured to receive the signal without using the FDRSB distortion reduction.

10. A method of wireless communication performed by a device, the method comprising: transmitting a capability message that includes an indication of whether the device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals; and receiving a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

11. The method of claim 10, wherein the indication specifies that the device supports the FDRSB distortion reduction, and wherein receiving the signal includes applying the FDRSB distortion reduction to the signal using FDRSB distortion reduction circuitry of the device. QLXX.P2036WO12. The method of claim 10, wherein the indication specifies that the device does not support the FDRSB distortion reduction, and wherein the signal is received without applying the FDRSB distortion reduction to the signal.

13. The method of claim 10, further comprising, after transmitting the capability message and prior to receiving the signal, receiving a configuration message indicating a precoder selection of one of the first precoder or the second precoder, wherein the signal is received in accordance with the precoder selection.

14. The method of claim 10, further comprising transmitting a power status message indicating a power status of the device, wherein the signal is precoded with one of the first precoder or the second precoder further in accordance with the power status message.

15. The method of claim 10, further comprising: after transmitting the capability message and prior to receiving the signal, receiving an FDRSB power estimate message indicating an estimated amount of FDRSB power associated with the signal; and performing a determination of whether the estimated amount of FDRSB power exceeds an FDRSB power threshold, wherein the signal is received in accordance with the determination.

16. The method of claim 15, wherein the estimated amount of FDRSB power exceeds the FDRSB power threshold, and wherein the signal is received using the FDRSB distortion reduction.

17. The method of claim 15, wherein the estimated amount of FDRSB power fails to exceed the FDRSB power threshold, and wherein the signal is received without using the FDRSB distortion reduction.

18. An apparatus for wireless communication, the apparatus comprising: a receiver configured to receive a capability message that includes an indication of whether a device supports frequency-dependent residual side band (FDRSB) distortion reduction for received signals; and QLXX.P2036WOa transmitter configured to transmit a signal that is precoded, in accordance with at least the indication of whether the device supports the FDRSB distortion reduction, with one of a first precoder or a second precoder that is different than the first precoder.

19. The apparatus of claim 18, wherein the transmitter is further configured to transmit a configuration message indicating a precoder selection of one of the first precoder or the second precoder in accordance with an FDRSB distortion measurement.

20. The apparatus of claim 19, wherein the FDRSB distortion measurement is associated with at least one of a factory calibration phase, a session setup procedure with the device, a temperature associated with the apparatus, a change in the temperature, a hardware reconfiguration associated with the apparatus, expiration of a time interval, or an offline learning stage. QLXX.P2036WO

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