64 results about "QAM" patented technology

The present invention discloses an unified multiple access (MA) based system for uplink transmission of data by multiple users. The system comprises an user interface integrated transmitter modules for transmitting the data from multiple user transmitters over waveforms through a cooperative unified data grid structure including grid points, said unified data grid structure including each user transmitter allocation of a few non-overlapping grid points for loading respective data bearing symbols, with zeros loaded onto unallocated grid points. The user transmitter is configured to transmit a sparsely loaded grid resembling to the unified two-dimensional data grid structure involving data-bearing Quadrature Amplitude Modulation (QAM), where a part of available grid points of the grid as allocated is loaded with QAM symbols and remaining grid points are loaded with zero symbols. A waveform modulator corresponding to user transmitter is also provided in the present system for waveform modulation of said sparsely loaded grid as per the waveforms enabling transmission for multi-antenna reception of the waveforms to a base station or an access point.

The present invention discloses a communication system including WLAN communication systems comprising transmitter including an OTFS grid based Orthogonal Time Frequency Space (OTFS) waveform generator and Multiple Input Multiple Output (MIMO) streams. The transmitter comprises signal processor including OTFS modulator having FEC (forward error correction) encoder for pre-FEC bit appended input data stream and transmission of encoded input data stream in a selective sequence vide OTFS waveform modulated OTFS grid-partially loaded with QAM / PSK symbols of said encoded input data stream through MIMO transmitter and receiver streams including MIMO pre-coder based multi antenna support for said transmission and reception of said OTFS waveform thereby enabling OTFS waveform transmission and retrieval of input data stream.

An apparatus includes a receiver configured to receive data, and circuitry configured to receive one or more symbols based at least on the data, determine, using the one or more symbols, an error vector magnitude (EVM) value, identify a quadrature amplitude modulation (QAM) size, determine, using the EVM value and the QAM size, a signal-to-noise (SNR) value, and adjust, based at least on the SNR value, a transmission rate of a transmitter.

The invention provides a communication method, device and system, and belongs to the technical field of communication, and the method comprises the steps: obtaining a bit rearrangement book table, the bit rearrangement book table comprises output bit sequences respectively corresponding to each bit rearrangement version number under different QAMs (Quadrature Amplitude Modulation), and the different QAMs comprise 16QAM, 64QAM, 256QAM, 1024QAM and 4096QAM; and determining an output bit sequence according to the bit reset list. According to the invention, the earnings of the HARQ can be effectively improved.

Methods, systems, and devices for wireless communications are described. A wireless device may encode one or more most significant bits (MSBs) of a bit sequence according to an encoding rate to generate a set of shaped bits. The bit sequence may include the one or more MSBs and one or more least significant bits (LSBs), where a quantity of the one or more MSBs that are encoded may be based on the encoding rate. The UE may map each bit of the set of shaped bits to a respective modulation symbol of a quantity of modulation symbols according to a quadrature amplitude modulation (QAM) scheme. The UE may also map the one or more LSBs to the quantity of modulation symbols according to the QAM scheme. The UE may modulate a signal based on the mappings and transmit the signal based on the modulation.

A communication method and apparatus is provided so that a fading channel can implement a good error correction capability. This helps improve information transmission reliability. The method includes: a transmit end device determines, based on N bit sets, a first sequence and a second sequence that are obtained through quadrature amplitude modulation QAM. The first sequence includes N in-phase components, and the second sequence includes N quadrature components; or the first sequence includes N quadrature components, and the second sequence includes N in-phase components, where N is an integer greater than or equal to 2. Then, the transmit end device performs interleaving processing on the first sequence, to obtain a third sequence. Then, the transmit end device sends, to a receive end device, a symbol sequence determined based on the second sequence and the third sequence. The symbol sequence includes N QAM symbols.

A method of estimating a wireless channel including determining a value of β from a finite set of discrete values for channel estimation in a slot N based on time-selectivity of a channel corresponding to the slot N; estimating the channel according to reference signal symbols received in the slot N; determining a transmit power level in a slot N−1, a transmit power level in the slot N, and a power offset ratio; identifying filtered channel coefficients in the slot N−1; and computing in real time filtered channel coefficients in the slot N according to a determined set of values β applied to generate a subset of equalized QAM symbols in the slot N, the estimated channel according to reference signal symbols received in the slot N, the determined power offset ratio, and the filtered channel coefficients in the slot N−1.

A plurality of cable modems (CMs) serviced by a cable management termination system (CMTS) are identified, each of the CMs being associated with a particular bandwidth service tier of a plurality of bandwidth service tiers. The plurality of CMs are grouped into a quantity of groups of CMs based on the bandwidth service tier with which each CM is associated. A CM orthogonal frequency division multiplexing (OFDM) profile is generated for each respective CM in each group of CMs. A plurality of group OFDM profiles are generated. Each respective group OFDM profile is generated based on the CM OFDM profiles of the CMs in a respective group of CMs and, for each subcarrier of a plurality of subcarriers, a quadrature amplitude modulation (QAM) order is identified.

The invention relates to the technical field of data processing, and particularly provides a method, a system, equipment and a medium for restoring an unknown signal constellation diagram, and the method comprises the steps: carrying out the self-correlation calculation of an in-phase I-path component of a received signal, carrying out the spectrum analysis of a self-correlation result, so as to enhance a spectrum component corresponding to a symbol rate, estimating the code element rate of the signal from the frequency spectrum; based on the code element rate, analyzing energy change characteristics of I-path and orthogonal Q-path components of the received signal, and detecting and identifying a code element boundary position to obtain a code element boundary sequence; and for each code element interval divided by the code element boundary sequence, aggregating I-path and Q-path sampling values in a stable region of each code element interval to obtain constellation point coordinates corresponding to each code element, and generating a constellation diagram by all constellation points. According to the invention, clear and accurate constellation diagram recovery of various modulation signals, especially high-order QAM signals, under the condition of low signal-to-noise ratio is realized.

The apparatus may be configured to process input information including a set of information bits for a quadrature amplitude modulated (QAM) transmission by performing a bit-shaping operation for the set of information bits to generate a set of shaped bits and adding cyclic redundancy check (CRC) bits before forward error correction (FEC) on a combination of the set of information bits and the CRC bits. The apparatus may further be configured to transmit the QAM transmission. The apparatus may be configured to receive a QAM transmission; perform a FEC decoding on the QAM transmission; obtain CRC bits from the QAM transmission after the FEC decoding; and perform a bit level de-shaping operation on a set of shaped bits to obtain a set of information bits.

Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically provide procedures and configurations used to perform, at a transmitter, probabilistic amplitude shaping (PAS) of quadrature amplitude modulation (QAM) communications using non-binary polar coding (NBPC). NBPC differs from binary polar coding (BPC) in that BPC uses a binary-input channel whereas NBPC uses a non-binary input channel. For example, while BPC uses a log likelihood ratio (LLR) with a single value corresponding to a given bit to be shaped, NBPC may use a probability mass function (PMF) to define or represent amplitude shaping target values. As another example, aspects use non-binary transformations, which reduce the number of passes to shape q bits from q passes (for BPC) to 1 pass (for NBPC).

The invention provides a communication method and device and a computer readable storage medium. The method comprises the steps of performing first processing on a first sequence based on a reference signal pattern to determine a target sequence; according to a first rule, second processing is carried out on the target sequence in a time domain to determine a reference signal, the reference signal is a signal after time domain mapping, the first rule is related to an orthogonal code corresponding to an antenna port number and / or a reference signal pattern, the antenna port number is an even number, and the antenna port number is an even number. By adopting the method and the device provided by the invention, multi-port transmission can be realized and the utilization rate of time-frequency resources can be improved in a scene that the requirement on a coverage scene is relatively high and the single carrier type is SC-QAM.

The invention provides a blind carrier phase recovery method and system for optical fiber communication, and the method comprises the steps: firstly grouping QAM symbol streams at a transmitting end, and inserting a reference pilot frequency with a specific fixed amplitude for each symbol group according to a quadrant where a first symbol is located; at a receiving end, after preliminary blind carrier phase estimation is completed, an original quadrant corresponding to the reference pilot frequency is identified by using a minimum Euclidean distance detection mechanism, and then the original quadrant is compared with an actual quadrant position of the pilot frequency in a received signal, so that a phase ambiguity offset taking 90 degrees as a cardinal number is analyzed; and performing phase correction on the corresponding symbol groups accordingly. According to the method, quadruple rotational symmetry limitation of a traditional constellation diagram is effectively broken through by means of amplitude modulation coding, and fixed angle phase deviation occurring in the blind phase recovery process can be accurately identified and corrected. According to the method, error code diffusion caused by phase ambiguity can be remarkably suppressed, the transmission performance of the system in the aspects of the error rate, generalized mutual information and the like is improved, meanwhile, good algorithm compatibility and engineering implementation convenience are achieved, and the extra overhead of the system is effectively controlled.

The invention relates to a system and method for estimating signal-to-noise ratio (SNR) and noise variance from error vector magnitude (EVM). In one embodiment, an apparatus includes a receiver configured to receive data; and circuitry configured to receive one or more symbols based at least on the data, determine an error vector magnitude (EVM) value using the one or more symbols, identify a quadrature amplitude modulation (QAM) size, determine a signal-to-noise ratio (SNR) value using the EVM value and the QAM size, and adjust a transmission rate of a transmitter based at least on the SNR value.

The invention discloses a joint coding and detection method for an OTFS-LDS system, and belongs to the technical field of digital-energy integrated communication networks. According to the joint coding and detection method, a QAM symbol is expanded into an LDS symbol vector, flexible distribution of data symbols on a whole DD plane is achieved, the flexibility of the system is improved, a foundation is laid for a subsequent low-complexity detection algorithm, and the detection efficiency is improved. The low-complexity detection algorithm is an improvement on a traditional message passing algorithm, the calculation complexity is reduced by adopting an approximation method, a convergence optimization mechanism is introduced, the overall detection performance is improved, edge elimination is achieved by introducing a threshold value, the algorithm complexity is further reduced, and finally, the LDS sparse matrix and optimization measures of the low-complexity detection algorithm are matched with each other, so that the detection accuracy is improved. Compared with the JMAP algorithm, the OTFS-LDS system has the advantage that the calculation complexity is greatly reduced while the performance of the OTFS-LDS system is close to that of the JMAP algorithm.

This application discloses a method and related apparatus for transmitting link adaptive control information with extremely high throughput in the field of wireless communication. In the technical solution provided in this application, the control subfield in the first message sent by the data receiver to the data transmitter includes one or more of the following fields: EHT indicator subfield, spatial stream number subfield, EHT-MCS subfield, and MSI subfield. One or more of the spatial stream number subfield, EHT-MCS subfield, and MSI subfield satisfy the following conditions: the proportion of the MSI subfield is less than or equal to 2; the maximum number of spatial streams that the spatial stream number subfield can indicate is greater than 8; and the MCS indicated by the EHT-MCS subfield includes one or more of the following: 4096-QAM, BPSK-DCM, and BPSK-DCM-DUP, thus realizing the transmission of link adaptive control information in standards 802.11be and later.

Reduced complexity maximum likelihood sequence detectors (rMLSDs) for detecting multi-bit symbols, such as symbols found in pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), and phase shift keying (PSK) signal constellations with more than two constellation points, are disclosed. One illustrative digital communication receiver includes an initial equalizer that derives an initial sequence of symbol decisions from a filtered received signal, each symbol decision in the initial sequence having a second possible symbol decision, and an rMLSD that derives a final sequence of symbol decisions by evaluating a state metric for only each symbol decision in the initial sequence and its second possible symbol decision.

A method for wireless communication at a user equipment (UE) includes receiving, from a network node, a first message querying a capability of the UE to support a modified high order quadrature amplitude modulation (QAM) scheme associated with a first constellation having a first group of regions, each region of the first constellation comprising a respective second constellation associated with a low order QAM scheme. The method further includes receiving, from the network node, a transmission in accordance with the modified high order QAM scheme based on the UE indicating the capability of the UE to support the modified high order QAM scheme. The transmission conveying a group of symbols, each symbol indicating a first set of bits indicating a first region of the first group of regions, and a second set of encoded bits indicating a constellation point in a respective second constellation comprised in the first region.

An apparatus may include a transmitter and one or more processors configured to identify a code rate of a low-density parity-check (LDPC) code, receive, by an LDPC encoder, a set of information bits and encode, using the code rate, the set of information bits to generate a set of encoded bits and a set of parity bits, generate, from the set of encoded bits, a matrix of bit arrays, discard one or more parity bits from the set of parity bits to generate a parity bit array with a size equal to a number of column of the matrix, generate a bit array by concatenating (1) one or more bit arrays selected from the matrix of bit arrays and (2) one or more bits selected from the parity bit array corresponding to the one or more bit arrays, and modulate, by a modulator, the bit array to generate modulated data.

This invention discloses a signal detection method for an OTFS system based on an adaptive wavelet scattering convolutional neural network, comprising: converting the data symbols to be transmitted to the DD domain, and then obtaining an OTFS signal through an OTFS modulator; the OTFS signal reaching the receiver through a wireless channel; at the receiver, transforming the received signal back to the DD domain using an OTFS demodulator; extracting the real and imaginary signal matrices from the received OTFS signal, performing a three-layer wavelet scattering network transformation on these two matrices to obtain scattering feature coefficients for each layer, concatenating the scattering feature coefficients along the feature channel direction to reconstruct a high-dimensional feature matrix of the signal, and using it as the input to an adaptive wavelet convolutional neural network 2D-AWCNN to obtain the possible values ​​corresponding to each QAM symbol; and performing 16-QAM demodulation on the output of the adaptive wavelet convolutional neural network 2D-AWCNN using a demodulator to obtain the output bits used for signal detection.

The invention discloses a QAM wireless transmission oriented NRZ-TI-DACs system and a data processing method thereof, and belongs to the field of ultra-wideband signal generation, and the system comprises a digital signal processor, a phase shift clock, two paths of high-speed DACs, an auxiliary DAC and a superposition output circuit. The method comprises the following steps that: a high-frequency digital input sequence generates two paths of two-frequency-division digital sequences and one path of three-frequency-division compensation digital sequence which are subjected to compensation processing through an improved differential decomposition algorithm of a digital signal processor; the two paths of two-way frequency division digital sequences are respectively sent to two paths of high-speed DACs, and the compensation sequences are sent to an auxiliary DAC; two paths of same-frequency out-phase clocks are used for driving the corresponding DACs respectively; finally, the analog signals output by the three paths of DACs are superposed, and ultra-wideband analog signals are synthesized and output. Through cooperation of an algorithm and hardware, DAC output peak values are effectively limited, system power consumption is reduced, waveform stability is enhanced, lossless data conversion is realized, and low bit error rate and symbol error rate are ensured.

The present disclosure relates to a wireless communication system using a quadrature amplitude modulation scheme. A transmission device includes: a transmission signal amplifier enabled to vary transmission power; a transmission power control unit that controls the transmission power; and an approximate pattern information notification unit that generates pattern information on an approximate constellation. In a case where 64 QAM is used as the modulation scheme, a 64 QAM distortion constellation is generated in the non-linear region of the transmission signal amplifier. In this case, a 64 APSK approximate constellation is generated, and pattern information on the 64 APSK approximate constellation is transmitted to a reception device. The reception device performs likelihood calculation for a reception point indicated by a data signal by using the approximate constellation corresponding to the pattern information.

This disclosure describes systems, methods, and devices related to optimized reliability. A device may determine a basic rate from an ultra-high reliability modulation and coding scheme (UHR-MCS) defined in a parameter set. The device may locate a non-HT reference rate by referencing a predetermined table based on the modulation and coding rate. The device may select a non-HT basic rate as a highest rate in a BSS basic rate parameter that is less than or equal to the non-HT reference rate. The device may map a plurality of new code rates for QPSK, 16-QAM, and 256-QAM to corresponding non-HT reference rates according to a predefined mapping procedure, wherein the device is operable to transmit a response frame to the UHR PPDU with the non-HT or non-HT duplicate PPDU and the rate determined by the non-HT basic rate.

The application relates to a high-dimensional QAM signal modulation system and a modulation method based on a clustering algorithm sequence extraction, and the method comprises the following steps: firstly, generating an original high-dimensional constellation point set and an index bit stream; then, calculating the clustering number according to a target source entropy and a sequence length, and clustering the original constellation points by adopting a K-means++ algorithm, selecting the sequence closest to the center in each cluster as a representative sequence to form an optimized constellation point set; then, mapping the index bit stream to the index of the representative sequence, extracting the corresponding QAM symbol sequence according to the index; finally, modulating the sequence into a time domain signal and transmitting, and at the receiving end, calculating the Euclidean distance between the received signal and all the representative sequences, identifying the sequence according to the minimum distance criterion and restoring the index bit stream. The application can significantly improve the noise resistance and the spectrum efficiency, controls the system complexity, and has great practical value in adapting to high-speed and high-reliability communication scenes.

Systems and methods are provided for an integrated chip. An integrated chip includes a package substrate including a plurality of first layers and a plurality of second layers, each second layer being disposed between a respective adjacent pair of the first layers. A transceiver unit is disposed above the package substrate. A waveguide unit including a plurality of waveguides having top and bottom walls formed in the first layers of the package substrate and sidewalls formed in the second layers of the package substrate.

A 6G-enabled AI protocol for real-time agent coordination, implemented on a TSMC N2 ASIC (2048 cores, 2 GHz), uses 256 QAM signals, DON scheduling, and Neuroelectrics NE-256CH EEG at 256 Hz for β-power prioritization, achieving sub-5 μs latency with 99.995% reliability over 10{circumflex over ( )}7 trials. It integrates symbolic channel modulation, zero-knowledge routing, EEG-based packet prioritization, sovereign containerization, DON task scheduling, symbolic DMA for sensor fusion, encrypted ledgers, and holistic network synthesis, yielding emergent AGI / ASI. Layers are scored for integrity, security, privacy, compliance, and governance via multiplicative formulas, achieving ≥0.99994. Compliant with GDPR, CCPA, and FDA via zk-SNARK and ethics arbitration, it supports autonomous vehicles, smart cities, and disaster-response networks.

The application discloses a high-order signal transmission method and system based on a double-channel architecture, and belongs to the technical field of communication. The method comprises the following steps: generating four-dimensional chaotic sequences X, Y, Z and V by using a key initial value; performing XOR operation on original data by using X and Y in the four-dimensional chaotic sequences to obtain exclusive or data; performing serial-parallel conversion, QAM mapping and null subcarrier mapping on the exclusive or data to obtain a constellation diagram; performing subcarrier column permutation on the constellation diagram by using Z and V in the four-dimensional chaotic sequences to obtain OFDM encrypted data; respectively performing DSM modulation on the OFDM encrypted data and the key initial value to obtain a baseband information stream and a baseband key stream; driving an optical I / Q modulator to load the baseband information stream and the baseband key stream into orthogonal components of an optical carrier respectively to synthesize a QPSK optical modulation signal; and performing coherent transmission on the QPSK optical modulation signal. The application can reduce the risk of information leakage.

A communication device transmits a radio frame including a preamble and a data field of a physical (PHY) layer. The preamble includes an L-STF, an L-LTF, an L-SIG, an EHT-SIG-A, an EHT-STF, and an EHT-LTF, the EHT-SIG-A includes a subfield indicating information of a modulation scheme and a code rate (MCS, Modulation and Coding Scheme), the data field includes data modulated and encoded in accordance with the modulation scheme and the code rate indicated by the subfield, and the subfield is configured to be capable of designating one of at least 2048 QAM and 4096 QAM as the modulation scheme.

The application provides a detection frame transmission method and related devices. The method is applied to a first device, and the method comprises: generating a detection frame, the detection frame comprising a first field, the first field comprising a predefined first sequence, wherein the first sequence comprises a sequence obtained by modulating a second sequence by at least one modulation mode, the modulation mode comprising: QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM; and sending the detection frame, so that when a channel is measured by using the first sequence, the channel quality of a communication link in at least one of the modulation modes of QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM can be accurately measured, and the application scenarios of the EHT-LTF sequence are enriched.