82 results about "Frequency-division multiple access" patented technology

The present disclosure relates to a wireless communication system. Specifically, the present disclosure relates to a device and method for supporting device-to-reader frequency division multiple access (D2R FDMA) for ambient Internet of Things (Ambient IoT) communication in a wireless communication system.

According to one embodiment, a wireless communication device includes: a receiver configured to receive a first frame notifying a start of resource unit-based OFDMA (Orthogonal Frequency Division Multiple Access) communication via a first channel; and controlling circuitry configured to control, when the first frame is received, the receiver to perform standby operation at least in a first resource unit in a second channel different from the first channel, wherein the first resource unit includes one or more subcarriers among a plurality of subcarriers disposed in the second channel.

A reception method and apparatus for use in a multi-cell orthogonal frequency division multiple access (OFDMA) wireless system. In a unicast receive mode during a first receive time period, a first group of orthogonal frequency division multiplexing (OFDM) symbols is received by a mobile device from multiple of a plurality of antennas at a serving base station. In a single-frequency-network (SFN) receive mode during a second receive time period, a second group of OFDM symbols is received by the mobile device from one of a plurality of antennas at the serving base station. The transition between the first receive time period and the second receive time period occurs during a cyclic prefix or a cyclic postfix between OFDM symbols, and the plurality of antennas produce a first beam pattern during the unicast receive mode and a second beam pattern during the SFN receive mode.

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 application discloses a kind of adaptive spectrum truncation method, device, terminal and medium for single-carrier frequency division multiple access system, method includes: obtaining the context information of current transmission;Based on context information, from the plurality of candidate truncation factors predefined, determine the target truncation factor used by current transmission, wherein the target truncation factor is the ratio of the target frequency domain sample number to be cut off and the original discrete fourier transform point number;The target truncation factor is synchronized to the transmitting device and the receiving device, and the target truncation factor is used to perform discrete fourier transform and spectrum truncation processing on the modulation symbol to be currently transmitted, to generate and send the final time-domain waveform signal.The application focuses on the lightweight adaptive mechanism of frequency domain sample truncation, determines the target truncation factor through context information, realizes the dynamic trade-off of spectral efficiency and transmission power under the premise of no machine learning training and no complex signaling interaction, and is especially suitable for devices sensitive to complexity and latency.

The invention relates to the technical field of wireless communication network distribution, and discloses a high-density small local area network multiple access cooperation rapid network distribution method and system, a transmitting end generates a network identifier containing a code division multiple access password and a frequency division multiple access table according to a preset mode, the preset mode comprises an address preset mode and an address distribution mode, and the address distribution mode comprises a code division multiple access password and a frequency division multiple access table; in the address distribution mode, the transmitting end and the receiving end dynamically enter a network distribution mode according to environmental interference, dynamically generate a unique network identifier, and finish broadcasting and receiving of the network identifier in a preset frequency band; the transmitting end sequentially initiates network distribution requests according to the dynamic interval time, after receiving the network distribution requests, the receiving end performs dual verification on code division multiple access passwords, frequency division multiple access table integrity and secret keys in the requests, network distribution is completed if verification is passed, and a communication link is established; according to the invention, simultaneous and stable coexistence of multiple networks in a high-density small local area network is realized, low-delay network distribution and communication are achieved, the anti-interference capability and the network expansion capability of the distribution network are improved, and the exclusive demand of a multi-transmitting-end coexistence scene is adapted.

The present invention relates to a wireless transmission station (110, 120), and more particularly, to a wireless transmission station (110, 120), which uses a resource unit (RU) or a multi-resource unit (MRU) in orthogonal frequency division multiplexing (OFDMA) communication or orthogonal frequency division multiple access (OFDMA) communication, and to a wireless transmission station (110, 120), which uses the resource unit (RU) or the multi-resource unit (MRU) in the orthogonal frequency division multiplexing (OFDMA) communication, and to a wireless transmission station (110, 120), which uses the resource unit (RU) or the multi-resource unit (MRU) in the orthogonal frequency division multiplexing (OFDMA) communication or the multi-resource unit (MRU) in the orthogonal frequency division multiple access (OFDMA) communication. The wireless transmission 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 a data subcarrier for carrying modulation data, and to allocate, based on the bit sequence, a second subset of the plurality of subcarriers of the RU or MRU as an IM pilot subcarrier for carrying a plurality of predefined interference suppression (IM) pilot symbols. Furthermore, the wireless transmitting station (110; 120) is configured to permutate the plurality of subcarriers of the RU or MRU, the plurality of subcarriers comprising 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.

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.

Disclosed is a wireless transmission station (110) for transmitting a bit sequence to a wireless receiving station (120) by means of an orthogonal frequency division multiplexing (OFDM) communication or an orthogonal frequency division multiple access (OFDMA) communication through a channel (130) having a channel bandwidth, and a method for transmitting the bit sequence to the wireless receiving station (120) by means of the orthogonal frequency division multiplexing (OFDMA) communication or the orthogonal frequency division multiple access (OFDMA) communication. The wireless transmitting station (110) is configured to encode the bit sequence using a forward error correction (FEC) encoder to obtain an encoded bit sequence, and to fill the encoded bit sequence with FEC post-fill bits to obtain a filled encoded bit sequence, wherein the number of bits of the filled coded bit sequence is set for modulation on K subcarriers of a resource unit (RU) defined by the IEEE 802.11 standard framework.

Methods for frequency division multiple access in ambient internet of things (AIoT) systems are provided. A method includes mapping first and second groups of baseband symbols to a first one and a second one of a plurality of frequency subbands. The method includes processing the first and second groups of baseband symbols to generate a first signal, transmitting the first signal in first time resources, and determining that a first one or more devices are capable of receiving a transmission using one of the frequency subbands and a second one or more devices are not capable of receiving a transmission using one of the frequency subbands. The method includes transmitting data for the first one or more devices in different frequency subbands; and transmitting data for one of the second one or more devices in a single one of the frequency subbands.

This provides a technology for appropriately applying Distributed Tone Resource Units (DRUs) to Coordinated Orthogonal Frequency Division Multiple Access (C-OFDMA) in the Basic Service Set. [Solution] A communication device according to one aspect of the present disclosure is a communication device that functions as an Access Point (AP) as defined in the IEEE 802.11 standard series, and includes a transmission means for transmitting an information element that includes information indicating that the communication device has the capability to support Coordinated Orthogonal Frequency Division Multiple Access (C-OFDMA) using a Distributed tone Resource Unit (DRU).

Radar systems and methods for generating mixed signal chirps are provided. An example radar system includes a set of transmitters including a plurality of subsets of transmitters; and a processor coupled to the set of transmitters. In operation, the processor applies a beamforming operation on outputs of transmitters within each subset of transmitters, in which a plurality of beamforming operations are respectively applied to the plurality of subsets of transmitters; applies a first multiple input-multiple output (MIMO) scheme to the subsets of transmitters; and applies a second MIMO scheme to the subsets of transmitters that share a common transmitter. The first MIMO scheme may be Doppler division multiple access (DDMA), and the second MIMO scheme may be one of time division multiple access (TDMA) and frequency division multiple access (FDMA).

Embodiments disclosed herein are directed to communicating time-critical ultra-low latency (ULL) data using one or more dedicated resource units (RUs). A station (STA) decodes a trigger frame received from an access point station (AP) encoded to indicate resource units (RUs) of an UL PPDU for an uplink multi-user orthogonal frequency division multiple access (UL MU OFDMA) data transmission by a first and a second station STA. The trigger frame may also be encoded to indicate configuration information for a dedicated RU for time-critical ultra-low latency (ULL) UL data. The dedicated RU may be one RU of one or more RUs of the UL PPDU that are reserved for time-critical communications. The STA may encode time-critical ULL UL data for transmission to the AP on the dedicated RU during the uplink MU OFDMA data transmission by the first and second STAs. The time-critical ULL UL data may start at any time during transmission of the UL PPDU. Medium access control layer (MAC) padding may be included in a MAC payload until the time-critical ULL UL data is available at the MAC layer of the STA.

In some aspects, the disclosure is directed to methods and systems for signaling and decoding of punctured sub-bands in a trigger-based PPDU. In one aspect, at least one of the communication interface or the processing circuitry of a wireless communication device is configured to generate a trigger frame that includes signaling indicating that at least one other wireless communication device is allowed to reduce a bandwidth of an allocated resource unit (RU) for transmitting data via a communication channel; transmit, via the communication channel, the trigger frame to at least one other wireless communication device; receive, via the communication channel and from the at least one other wireless communication device, an uplink (UL) orthogonal frequency division multiple access (OFDMA) frame including the data; and process the UL OFDMA frame including the data based on the signaling.

Systems and methods for Orthogonal Frequency-Division Multiple Access (OFDMA) optimized steering in Wi-Fi networks (10, 10A, 32). The present disclosure contemplates operation in a multiple access point network (14, 36) utilizing OFDMA technology, e.g., IEEE 802.11ax, where clients are connected to the access points considering the effect on OFDMA operation depending on where the clients are connected. That is, the present disclosure considers OFDMA operation in the context of optimization in a distributed or multiple access point network (14, 36). The optimization decision is based on capabilities of client devices and / or the access points, including OFDMA capability, MIMO capability, channel capability, etc. The optimization decision is used to select where client devices should connect, and optimization factors may include individual device throughput, joint load throughput (system capacity), fairness, etc.

The invention relates to the technical field of industrial wireless communication, in particular to a time-frequency joint calibration method based on carrier frequency offset and terminal equipment, and the method comprises the steps that the terminal equipment receives a downlink wireless frame sent by access point equipment, obtains the carrier frequency offset through a known reference signal in the frame, and transmits the carrier frequency offset to the access point equipment; the offset represents the relative deviation of the frequency of the crystal oscillator and is stored; when time synchronization calibration or uplink transmission is needed, the offset is read, and the local timestamp growth rate is adjusted or frequency pre-compensation is carried out on an uplink signal. The terminal equipment comprises a receiving unit, a processing unit, a storage unit, a reading unit, a time calibration unit and a frequency compensation unit. According to the invention, time-frequency joint calibration is realized by using single frequency offset estimation, trigger frame interaction is reduced, system control overhead and communication delay are reduced, and synchronization precision and signal orthogonality of multi-user uplink orthogonal frequency division multiple access transmission are improved.

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.

An OFDMA power control method includes: transmitting a first trigger frame to a station, wherein the first trigger frame includes a first target RSSI; receiving a first TB-PPDU from the station, wherein the first TB-PPDU is transmitted by the station using a first power according to the first target RSSI; measuring a first power of the first TB-PPDU to obtain a first measured RSSI; and generating a second the target RSSI according to the first measured RSSI.

This disclosure describes a system for applying precise timing to a wireless mesh Wi-Fi network. The precise timing enables multiple access points (APs) to serve a single station (STA) when the STA is located within the wireless footprint of more than one access point, without requiring a wireless trigger frame. Several examples are described, including the use of OFDMA (Orthogonal Frequency Division Multiple Access), TDMA (Time Division Multiple Access), and the shared transmission of multiple access points.

In one embodiment, a wireless access point receives, from a mobile system, a broadcast beacon that includes a roaming notification indicating that the mobile system intends to roam to the wireless access point. The wireless access point allocates, after receiving the broadcast beacon from the mobile system, an orthogonal frequency-division multiple access resource unit for use by the mobile system. The wireless access point sends a trigger message to the mobile system that includes an indication of the orthogonal frequency-division multiple access resource unit. The wireless access point performs, after sending the trigger message, a handoff exchange with the mobile system using the orthogonal frequency-division multiple access resource unit to attach the mobile system to the wireless access point.

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).

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.

A station (STA) receives, from an access point (AP) and via a primary channel (PCH), a first trigger frame indicating a first random access resource unit (RA-RU). The STA decrements a first orthogonal frequency division multiple access (OFDMA) backoff (OBO) counter for the PCH. The STA determines that a physical protocol data unit (PPDU) being received via the PCH comprises an inter-basic service set (BSS) PPDU. Based on the determining, the STA switches from the PCH to a non-primary channel access (NPCA) PCH. The STA initializes a second OBO counter for the NPCA PCH. In response to a second trigger frame, indicating a second RA-RU and received via the NPCA PCH, the STA maintains a value of the first OBO counter and decrements the second OBO counter.

The application relates to the technical field of communication, in particular to a fiber network system and method for intelligent equipment. The system comprises a central optical node and a plurality of access optical nodes. The central optical node is arranged in a central computing unit of the equipment, and is internally provided with a laser light source and a power splitting unit. The central optical node outputs the same-wavelength optical carrier to distribute the local oscillation light path and the access optical nodes at each edge gateway. Each access optical node modulates uplink data to different frequency point subcarriers based on the same-source optical carrier to realize uplink frequency domain isolation transmission through FDMA. The central optical node converges multiple uplink optical signals through an optical coupler, a coherent receiver multiplexes the same-source local oscillation light to complete coherent reception and converts the optical signals into electrical signals, and a digital signal processing module analyzes the electrical signals to separate and recover each uplink data. The network architecture of the application is simple, uplink signal interference is avoided by relying on frequency division multiple access, and the coherent reception improves the receiving sensitivity, so that the application is suitable for the internal multi-point fiber high-speed communication scene of intelligent equipment.

A method performed by an access point multi-link device (AP MLD) to coordinate trigger-based uplink transmissions across multiple wireless links from a station MLD (STA MLD). The method involves determining an allocation of groups of frequency subcarriers to be used on each wireless link of the multiple wireless links for simultaneous uplink transmission from the STA MLD to the AP MLD; including, in a single trigger frame or in each of multiple trigger frames, information indicating the allocation of groups of frequency subcarriers to be used on each wireless link of the multiple wireless links; and transmitting the single trigger frame on one wireless link of the multiple wireless links, or the multiple trigger frames simultaneously across the multiple wireless links to the STA MLD.

Provided in the embodiments of the present application is a wireless communication method, which includes: negotiating, by an AMP device, first information with a network side, where the first information is used for indicating whether the AMP device supports uplink FDMA and / or downlink FDMA.

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.

The invention discloses a surface acoustic wave double-frequency reader structure for multi-level soil temperature and humidity detection and a detection method. Aiming at the condition that the number of levels is large and the device adopts combination of time division multiple access and frequency division multiple access of two frequency bands of 840-845 MHz and 920-925 MHz, a direct digital frequency synthesizer of a transmitting link is mixed with a phase-locked loop to obtain double-frequency excitation signals which comprise two mirror image frequencies of 842.5 MHz and 922.5 MHz, a receiving link constructs a double-frequency channel through two duplexers, and the receiving link is connected with the receiving link through the two duplexers. Meanwhile, echo pulse string signals of all the double-frequency surface acoustic wave devices are received, and the signals are processed in parallel through a double-frequency digital quadrature demodulator to obtain soil temperature and humidity values of all levels. Compared with polling emission of excitation signals with two frequencies and time-sharing information processing, the method has the advantages that real-time performance is good, mirror image frequency does not need to be eliminated, the reader structure is remarkably simplified, and time sequence control is very simple.

Systems and methods for Wi-Fi sensing are provided. A method for Wi-Fi sensing carried out by a sensing device including a processor is described. Initially, a sensing goal is received. Upon receiving the sensing goal, at least one sensing transmitter and at least one sensing receiver are selected according to the sensing goal. Thereafter, an allocation of channel resources reserved for defined transmissions from the at least one sensing transmitter to the at least one sensing receiver is determined according to the sensing goal. The defined transmissions are caused from the at least one sensing transmitter to the at least one sensing receiver according to the allocation of channel resources.