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

The invention provides a novel hybrid carrier multiple access scheme. According to the scheme provided by the invention, the energy propagation concept of the hybrid carrier is combined with a frequency division multiple access model, and a specific operation method and a processing flow of the hybrid carrier processing and the multiple access processing of the power signal in the sending and receiving processes are provided; and the requirements of signal anti-interference capability, transmission efficiency and multi-user and multi-time-space under an ad hoc network of a power wireless private network are met, and the method is called as hybrid carrier non-orthogonal multiple access (HC-OFDMA). Due to the fact that the energy dispersion capacity is enhanced, a plurality of users can share the same spectrum resource at the same time through non-orthogonal distribution of a power domain, the spectrum utilization rate can be remarkably improved, power distribution can be dynamically adjusted, transmission is optimized according to channel conditions of the users, more users are supported to access at the same time, the system capacity is improved, and the system performance is improved. The method is especially suitable for high-density users and large-scale Internet of Things scenes.

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.

The invention relates to a system and method for frequency domain copy mode transmission using orthogonal codes. A system for providing copy mode orthogonal frequency division multiple access transmission while maintaining a relatively low peak-to-average power ratio is disclosed. Data to be transmitted are converted into symbols, and the symbols are copied to a certain number of resource units. A phase shift is applied to a number of symbols prior to transition to the time domain for transmission. The phase shift may be removed at the receiver prior to decoding the signal into transmitted data.

The invention discloses an Internet of Vehicles secure unloading and cache optimization method based on a graph neural network, relates to the field of intelligent traffic and edge computing, and aims to solve the problems of low resource scheduling efficiency, insufficient privacy protection and task and cache processing separation of the Internet of Vehicles. The method comprises the following steps: S1, constructing an Internet of Vehicles system model, a communication model comprising a vehicle-roadside unit-macro base station architecture, an orthogonal frequency division multiple access and dedicated short-range communication protocol, and a calculation model comprising local processing and partial remote unloading; s2, Gaussian noise is introduced to realize differential privacy protection, and asynchronous federated learning is combined with a long-short-term memory network to predict task popularity; and S3, constructing a dynamic heterogeneous graph, extracting spatio-temporal features by means of a graph neural network, inputting a near-end strategy optimization algorithm, and jointly optimizing an unloading target, a proportion and a caching strategy. According to the method, the collaborative improvement of privacy security, low system total time delay, high cache hit rate and resource utilization rate is realized, and the method adapts to the dynamic topology and complex task requirements of the Internet of Vehicles.

Embodiments of the present application provides system, methods and apparatus for partial long training sequence (LTS) using DRU tone plan. An orthogonal frequency division multiple access (OFDMA) frame is transmitted using a plurality of DRUs. The frame includes a scattered long training field (SLTF) portion which furthers includes one or more orthogonal frequency division multiplexing (OFDM) symbols. Each of these symbols carries a portion of the LTS using a respective DRU. At least two different OFDM symbols use different respective DRU to carry the LTS portion. Each of these symbols further carries data using another respective one or more DRUs. Transmission of this frame may inhibit LTF overhead and may allow for transmitting increased data size.

To provide a communication device, a communication method, and a program that efficiently identify a device that performs relay communication when the relay communication is used in communication between an access point and a station.SOLUTION: In a wireless communication system, a communication device that communicates with another communication device communicates data frames by selectively using a first communication method in which radio resources are allocated using at least two or more first-type resource units (RUs) each consisting of a plurality of subcarriers arranged contiguously on a frequency axis based on capability of the other communication device, and data is communicated by orthogonal frequency division multiple access (OFDMA) using the radio resources, and a second communication method in which radio resources are allocated using at least two or more second-type RUs each consisting of a plurality of subcarriers arranged so that at least some of the subcarriers are discontinuous on the frequency axis, and the data is communicated by the OFDMA using the radio resources.SELECTED DRAWING: Figure 14

The application discloses a local communication service resource isolation method and device, a storage medium and an electronic device, the method calculates resource demand and access value of a communication service based on access information of the communication service, abstracts the problem of resource allocation for the communication service based on the resource demand and the access value into a two-dimensional matrix packing problem based on an orthogonal frequency division multiple access technology, solves the two-dimensional matrix packing problem by using a pointer network and an Actor-Critic algorithm, and obtains a network slice allocation result of the communication service, so that the reasonable use of spectrum resources is realized by technologies such as OFDMA, meanwhile, the transmission of more valuable communication services is ensured by considering the resource demand and the access value during allocation, and finally, the logical isolation between communication services is realized by constructing a network slice during resource allocation of the communication services.

An communication apparatus of the present disclosure comprises a receiver that receives a Trigger frame for allocating resource units (RUs) for random access and another frame including Random Access parameter element that comprises a first field indicating an OFDMA contention window (OCW) minimum value (OCWmin) and a second field indicating an OCW maximum value (OCWmax); and control circuitry that controls Uplink OFDMA-based Random Access (UORA) procedure using the OCWmin and the OCWmax.

The invention relates to an imitated radio frequency division multiple access method and system, and the method comprises the steps: obtaining the number of transmitting end users, and determining the number of subcarriers allocated to each transmitting end user in a DAFT domain according to the number of subcarriers in the DAFT domain; wherein the number of subcarriers allocated to each sending end user is the same; the method comprises the following steps: acquiring to-be-sent data of a sending end user, and modulating the to-be-sent data to obtain a modulation symbol vector; performing discrete affine Fourier transform on the modulation symbol vector of the sending end user to obtain an extended symbol vector multiplexed on a subcarrier; performing extension mapping on the extension symbol vector on the subcarrier according to a subcarrier mapping matrix to obtain an extended transmission symbol vector; and performing inverse discrete affine Fourier transform on the transmission symbol vector to obtain a time domain transmission signal, and sending the time domain transmission signal to a receiving end base station. According to the scheme of the invention, the interference between users can be effectively suppressed, and meanwhile, the spectrum utilization rate is improved.

An energy efficiency optimization method for multi-cell communication systems based on intelligent reflector-assisted rate division multiple access (RSMA) combines RSMA with intelligent reflector RIS. RIS intelligently regulates signal transmission links to enhance signal transmission quality, thereby improving signal quality for users at cell edges. RSMA effectively suppresses co-channel interference between users by flexibly controlling rate division strategies and beamforming. To this end, an optimization problem is constructed with the goal of maximizing system energy efficiency, jointly optimizing the beamforming vector, rate division multiple access matrix, and phase shift matrix on the base station side and the RIS side. To solve this non-convex optimization problem, an iterative solution is proposed for the beamforming, rate division, and phase shift optimization subproblems. Continuous convex optimization is used for the former, and semidefinite programming and penalty function methods are used for the latter. Compared with traditional space division multiple access and non-orthogonal frequency division multiple access, this method can achieve energy efficiency improvements of 28.5% and 10.2% for multi-cell communication systems, respectively.

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.

A method of radio communication, the method comprising: at an access point (AP), receiving a first wake-up radio (WUR) setup request from a first station (STA), the first WUR setup request comprising an indication that the first STA is ready to resolve a multi-user (MU) WUR packet transmitted in frequency division multiple access (FDMA); in response to the WUR establishment request, sending a first WUR establishment response to the first STA, wherein the first WUR establishment response specifies a first frequency channel offset relative to a primary channel of a frequency band, and the first frequency channel offset corresponds to a first frequency channel included in the frequency band; and Sending a first MU-WUR packet to a plurality of STAs including the first STA using FDMA, wherein the first MU-WUR packet comprises a plurality of wake-up signals transmitted using different frequency channels included in the frequency band, the plurality of wake-up signals comprising a first wake-up signal transmitted in the first frequency channel and operative to activate a main radio located in the first STA; the method further comprising: in response to a second WUR setup request from a second STA, sending a second WUR setup response to the second STA, wherein the second WUR setup response assigns a second frequency channel to be used to transmit a second wake-up signal to the second STA, wherein transmitting the first MU-WUR packet further comprises transmitting the first MU-WUR packet without using the second frequency channel and without a wake-up signal directed to the second STA in response to an indication that the second frequency channel is busy or a determination that no wake-up signal is pending for transmission to the second STA.

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.

A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters / combiners, and optical add / drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. As the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and thus the amount of data provided to each node, may be changed accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control channel information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

A communication method has the steps of: transmitting a signal to a device using a first resource unit (RU) in an orthogonal frequency-division multiple access (OFDMA) physical layer protocol data unit (PPDU) having a plurality of subcarriers for transmitting data, pilot symbols, or a combination thereof. The first RU is one of a plurality of RUs of the OFDMA PPDU, each RU comprises a subset of the plurality of subcarriers, and, in each RU, each pair of neighboring subcarriers thereof are separated by a substantially same number of subcarriers belonging to one or more other RUs of the plurality of RUs. In some embodiments, the subcarriers of each RU are same as those determined in accordance with a design method that shuffles the plurality of subcarriers using a relative prime interleaving method.

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 invention discloses a random access method and device of a terminal, equipment, a medium and a program product, the terminal receives an inventory instruction sent by read-write equipment, responds to the inventory instruction, and sends an air interface temporary identifier in the same time slot by using a code division multiple access mode or a frequency division multiple access mode to preempt random access resources; and under the condition that the random access resource is successfully preempted, performing time domain serial transmission on uplink data by using a time division multiple access mode. By adopting the invention, the hybrid random access of the terminal can be realized by combining different schedulable resources in the competition access and data transmission stage in the passive Internet of Things communication process, and the access efficiency of the terminal is improved.

For example, a wireless communication device can be configured to: determine RU allocations to multiple resource elements (RUs) of multiple wireless communication stations (STAs), the RU allocation assigning RUs from the multiple RUs to STAs from the multiple STAs, wherein the size of the RUs assigned to the STAs is based at least on a service rate parameter, the service rate parameter depending on the service rate of the downlink (DL) service of the STA; and transmit multi-user (MU) DL orthogonal frequency division multiple access (OFDMA) physical layer protocol data units (PPDUs) to the multiple STAs according to the RU allocation.

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).

This disclosure provides methods, components, devices, and systems for sounding for trigger-based ranging. Some aspects more specifically relate to a first wireless device dividing a frequency bandwidth available for ranging procedures into a plurality of subbands in accordance with orthogonal frequency-division multiple access (OFDMA) techniques. In some implementations, the first wireless device may transmit a trigger frame that assigns a subband to a respective neighbor wireless device. Each respective neighbor wireless device may transmit, during a same time occasion, a respective sounding signal via each respective subband allocated to the respective neighbor wireless device. In some implementations, the first wireless device may perform sounding procedures using combined multiple input multiple output (MIMO) and OFDMA techniques, where each neighbor wireless device may be assigned a respective spatial stream. Accordingly, the first wireless device may support sounding procedures for larger quantities of neighbor wireless devices.

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).

The disclosure relates to a wireless communication system, and more particularly to, for example, but not limited to, Orthogonal Frequency Multiple Access (OFDMA) operation under co-existence constraint in wireless networks. A station (STA) in a wireless network, comprises at least one processor including processing circuitry, and memory storing instructions that, when executed by the at least one processor individually or collectively, cause the STA to: transmit, to an access point (AP), a first frame using a first communication protocol, the first frame indicating unavailability associated with a coexistence constraint imposed by a second communication protocol, the first frame including resource information indicating an unavailable resource, receive, from the AP, a second frame using the first communication protocol, the second frame allocating a resource that is determined to avoid interference by the coexistence constraint, and perform communication with the AP based on the allocated resource.

In some aspects, the disclosure is directed to methods and systems for overlapping orthogonal frequency-division multiple-access (OFDMA) channels for coexistence of devices and legacy devices, including DOCSIS 3.1 mid-split and high-split cable modems (CMs). Described are systems and methods for providing a CMTS with capability for managing overlapping OFDMA channels to support mid-split and high-split CMs, without modification to legacy CMs.

Embodiments of the present application provides system, methods and apparatus for partial long training sequence (LTS) using DRU tone plan. An orthogonal frequency division multiple access (OFDMA) frame is transmitted using a plurality of DRUs. The frame includes a scattered long training field (SLTF) portion which furthers includes one or more orthogonal frequency division multiplexing (OFDM) symbols. Each of these symbols carries a portion of the LTS using a respective DRU. At least two different OFDM symbols use different respective DRU to carry the LTS portion. Each of these symbols further carries data using another respective one or more DRUs. Transmission of this frame may inhibit LTF overhead and may allow for transmitting increased data size.