15 results about "Orthogonal frequency-division multiple access" patented technology

Logic to generate a 320 megahertz (MHz) extremely high throughput (EHT) physical layer protocol data unit (PPDU) comprising a multi-resource unit (MRU). Logic to generation of a non-orthogonal frequency division multiple access (non-OFDMA) 320 MHz EHT PPDU, wherein the MRU comprises a 240 MHz multi-MRU, the 240 MHz MRU comprising at least two contiguous 996 tone resource units (RUs). Logic to generation of an OFDMA 320 MHz EHT PPDU, wherein the MRU comprises at least one 996 tone RU and one 484 tone RU. Logic to cause the transmission of the 320 MHz EHT PPDU. And logic to receive and decode the 320 MHz EHT PPDU.

The present disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for implementing multi-user (MU) communications in a wireless mesh network. A first mesh node or a network management unit can collect information from various mesh nodes and form MU association groups based on the information. The MU association groups can include a MU group leader that coordinates MU group communications to or from member mesh nodes in the MU association group. For example, the MU group leader can coordinate orthogonal frequency division multiple access (OFDMA) resource unit allocations, or MU multiple-input multiple-output (MU-MIMO) spatial stream configurations, among others. Different MU association groups can be formed for uplink traffic or downlink traffic. The creation of MU association groups can enable the wireless mesh network to realize the benefits of MU group communications within the flexible topology of a mesh environment.

The present disclosure relates generally to coding modulation techniques for use in digital communication systems such as Orthogonal Frequency Division Multiple Access (OFDMA) systems. More particularly, the present disclosure relates to methods and apparatus for multi-level encoding and decoding. Different receivers coupled to different parallel downlink channels having different channel qualities decode different received signal constellations at different levels of resolution. This allows the overall OFDMA downlink to operate at significantly higher data rates, thereby significantly improving system-level bandwidth efficiency.

A method and device are provided for receiving and transmitting data in a wireless local area network. The device receives a Physical Layer Protocol Data Unit (PPDU) from a station across a transmission bandwidth and determines whether the station belongs to a Basic Service Set (BSS) managed by the device, based on the PPDU. When the PPDU is multi-user (MU-PPDU), the access point (AP) determines that the station does not belong to the BSS managed by the AP. Such an MU-PPDU includes a first signal field and a second signal field; the first signal field contains bandwidth information indicating the transmission bandwidth, and the second signal field contains user-specific information allocated for orthogonal frequency-division multiple access (OFDMA) transmission.

This invention relates to a method for transmitting and receiving data in a wireless communication system and a wireless communication terminal. A method for transmitting and receiving PPDUs in a wireless communication system is disclosed. A terminal receives a frame from an access point (AP) instructing one or more terminals to transmit a PPDU, and transmits the PPDU based on the AID12 subfield included in the frame. At this time, when the PPDU instructed to be transmitted by the frame is an Extremely High Throughput (EHT) PPDU, the value of the AID12 subfield is set to one of a plurality of values ​​other than at least one specific value, which is used to allocate resources for supporting at least one terminal with High Efficiency (HE) using Uplink Orthogonal Frequency Division Multiple Access (UORA).

Embodiments of the present disclosure relate to the technical field of communications, and provide a communication method and apparatus, a device, and a storage medium, which can be applied to an access point (AP) device. The method comprises: determining a first message frame, wherein the first message frame comprises a first capability information element, the first capability information element comprises first identification information, and the first identification information indicates that the AP device supports non-orthogonal frequency division multiple access (non-OFDMA) uplink (UL) multi-user multiple-input multiple-output (MU-MIMO) communication on 640 MHz bandwidth; and sending the first message frame. The embodiments of the present disclosure can provide a communication mode that indicates a bandwidth supported in non-OFDMA UL MU-MIMO communication.

This invention discloses a multi-target cooperative perception method for connected autonomous vehicles, relating to the field of autonomous driving technology. It includes: acquiring environmental data to construct local perception features and compressing them to obtain compressed features; constructing a path loss and channel gain model and calculating communication transmission delay using orthogonal frequency division multiple access (OFDM); establishing end-to-end perception delay and energy consumption models to obtain the perception delay and energy consumption corresponding to each role; constructing a multi-target optimization model; asynchronously generating action policies through an Actor network with a self-attention mechanism and evaluating the global state value through a Critic network with a graph attention mechanism to output the action policies; decompressing and fusing the compressed features for target detection; calculating multi-target reward values ​​and updating the parameters of the Actor network and Critic network respectively. This invention achieves adaptive cooperation by combining asynchronous architecture and multi-target optimization with attention reinforcement learning, balancing accuracy and energy consumption, and improving perception efficiency and robustness.

A wireless transmitter station using a resource unit (RU) or multiple resource unit (MRU) of an Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication is disclosed. The wireless transmitter station is configured to allocate a first subset of a plurality of tones of the RU or MRU as data tones for carrying modulated data based on the bit sequence and to allocate a second subset of the plurality of tones of the RU or MRU as interference mitigation (IM) pilot tones for carrying a plurality of predefined IM pilot symbols. Moreover, the wireless transmitter station is configured to permute the plurality of tones of the RU or MRU, including both the first subset comprisingNS⁢DIMdata tones and the second subset comprisingNSPIMIM pilot tones, for obtaining a plurality of permuted tones of the RU or MRU.

This disclosure provides methods, devices and systems for generating packet preambles. Some implementations more specifically relate to preamble designs for special cases such as, for example, full-bandwidth multi-user multiple-input multiple-output (MU-MIMO), single-user (SU) preamble puncturing, hybrid automatic repeat request (HARQ), and multi-AP coordination. Multi-AP coordination may refer to coordinated beamforming (CoBF), joint transmission (JT), or coordinated orthogonal frequency division multiple access (C-OFDMA). Additionally, or alternatively, some implementations more specifically relate to preamble designs that accommodate signal fields of different cases.

Systems, methods, and instrumentalities are disclosed for adaptation of multiple input multiple output (MIMO) mode in mmW Wireless Local Area Network (WLAN) systems. A first station (STA) may receive a mode change request from a second STA. The mode change request may indicate a mode change for a MIMO mode, a polarization mode, and / or an orthogonal frequency-division multiple access (OFDMA) mode. The mode change request may include one or more STA fields. The one or more STA fields may include a STA field associated with the first STA. Each of the one or more STA fields may include a MIMO mode subfield, a polarization mode subfield, and / or an OFDMA mode subfield. The first STA may change the MIMO mode, the polarization mode, and / or the OFDMA mode, for example, based on the mode change request. The first STA may send a mode change response to the second STA.

A wireless transmitting station (110; 120) using a resource unit (RU) or multiple resource unit (MRU) in orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication is disclosed. The wireless transmitting station (110; 120) is configured to allocate, based on the bit sequence, a first subset of a plurality of subcarriers of the RU or MRU as data subcarriers for carrying modulated data and a second subset of the plurality of subcarriers of the RU or MRU as interference mitigation (IM) pilot subcarriers for carrying a plurality of predefined IM pilot symbols. Furthermore, the wireless transmitting station (110; 120) is configured to permute the plurality of subcarriers of the RU or MRU, including the first subset comprising data subcarriers and the second subset comprising IM pilot subcarriers, to obtain a plurality of permuted subcarriers of the RU or MRU.

A communication method has the step of transmitting a signal in a millimeter wave (MMW) band to a device using a resource unit (RU) in an orthogonal frequency-division multiple access (OFDMA) physical layer protocol data unit (PPDU). The RU is one of a plurality of RUs of the OFDMA PPDU. The plurality of RUs are on the opposite frequency sides of one or more direct-current (DC) subcarriers. Each RU of the plurality of RUs is a 26-subcarrier group, or is partitionable to a plurality of 26-subcarrier groups interleaved with a plurality of null-subcarrier groups, each of the plurality of 26-subcarrier groups or a combination of the plurality of 26-subcarrier groups usable as a separate RU.

This application discloses a vehicle positioning method and related apparatus, relating to the field of vehicle positioning technology. The method is applied to a roadside unit (Roadside Unit), which communicates with an on-board unit (OV) via an Orthogonal Frequency Division Multiple Access (OFDM) side link. The method includes: simultaneously receiving multiple uplink reference signals transmitted from multiple OV units; performing channel estimation and channel separation on the multiple uplink reference signals to obtain the channel frequency response corresponding to each OV unit; processing the channel frequency response corresponding to each OV unit using a super-resolution algorithm to obtain the angle of arrival (Angle of Arrival) and distance of arrival (DAR) corresponding to each OV unit; and determining the position of the vehicle corresponding to each OV unit in the coordinate system corresponding to the Roadside Unit based on the Angle of Arrival and DAR corresponding to each OV unit. This application's method combines the multi-user interference-free access capability of OFDM with super-resolution parameter estimation technology, achieving high-precision, high-concurrency real-time positioning of multiple vehicles in complex vehicle-to-everything (V2X) environments.

Various embodiments of the present disclosure relate to a method and device for performing an orthogonal frequency division multiple access (OFDMA)-based random access in a wireless LAN system. The method performed by a first access point (AP) according to an embodiment of the present disclosure may comprise the steps of: receiving a control frame from a second AP, wherein the control frame includes information related to the fact that a portion of a transmission opportunity (TXOP) of the second AP is to be used in a multi-AP (M-AP) coordinated transmission scheme; and performing an operation related to an AP OFDMA-based random access for transmitting an accept response related to using the M-AP coordinated transmission scheme in the portion of the TXOP of the second AP.

A signaling mechanism is provided that includes a restricted random access resource unit (XRA RU) that restricts uplink random access, such as by using Uplink Orthogonal frequency-division multiple access-based Random Access (UORA), to a subset of a plurality of stations that are associated with an Access Point (AP). In one aspect, an AP allocates a resource unit as an XRA RU that restricts uplink random access to a subset of a plurality of stations (STAs) that are associated with the AP. The AP transmits an uplink trigger that includes the XRA RU. The AP restricts use of the XRA RU to the subset of the plurality of STAs. In this way, STAs of the subset can attempt contention-based random access with the XRA RU while other STAs are prevented from attempting random access with the XRA RU.