77 results about "Quadrature amplitude modulation" patented technology

The invention belongs to the technical field of wireless communication, and discloses a communication and perception integrated system applied to speed measurement and distance measurement, which comprises a transmitting end, a transmission end, a communication receiving end and a perception receiving end, the method comprises the following steps: firstly, combining a bilinear frequency modulation signal with a probabilistic shaping 64-order quadrature amplitude modulation signal PS-64QAM; and then, based on a photon-assisted technology, constructing a terahertz frequency band communication sensing integrated system, and simultaneously realizing distance measurement, speed measurement and communication functions. According to the communication and sensing integrated system applied to speed measurement and distance measurement, PS64QAM-DLFM terahertz sensing integrated signals are generated through the time division multiplexing technology and the photon-assisted technology, the system has the high-speed communication function, the high-precision distance measurement function and the speed measurement function with a certain capacity at the same time, the sensing aspect is benefited from the bilinear frequency modulation technology, and the speed measurement accuracy is improved. Accurate measurement of the distance of a high-speed moving target is realized, and the problem of fuzzy distance and speed combined measurement in a sensing integrated system is solved.

The invention provides a code modulation method and device, electronic equipment, a storage medium and a program product. The method comprises the following steps: probability constellation shaping coding is carried out on a payload bit data stream to be sent to obtain a bit data stream after shaping coding, and the bit data stream after shaping coding comprises non-equal-probability amplitude bits corresponding to orthogonal amplitude modulation constellation points and a part of equal-probability symbol bits; the bit data stream after shaping coding is recombined and adapted to be in a frame format corresponding to error correction coding, forward error correction coding is carried out, an error correction code bit data stream is obtained, and the error correction code bit data stream comprises non-equal-probability amplitude bits corresponding to orthogonal amplitude modulation constellation points and equal-probability symbol bits; and recombining and adapting the error correction code bit data stream into a frame format corresponding to quadrature amplitude modulation, and mapping into a plurality of modulation constellation points according to a quadrature amplitude modulation constellation diagram. The signal-to-noise ratio is improved, and the communication performance and the transmission stability are improved.

The embodiment of the invention discloses a data processing method for optical communication and a related device, which adopt inner code coding with higher gain to improve the performance of cascade coding, can be better compatible with DP-16QAM (quadrature amplitude modulation) and DP-QPSK (differential phase shift keying) modulation, and can be favorably applied to high-baud-rate long-distance transmission scenes such as 800G and 1.6 T-ZR. Specifically, firstly, a first bit set is obtained, the first bit set comprises d1 bits, d1 = 244664 * L, and L is a positive integer. Then, first FEC coding is carried out on the first bit set to obtain a second bit set, the second bit set comprises d2 bits, every 244664 bits in the first bit set are subjected to first FEC coding to obtain every 261086 bits in the second bit set, and d2 = 261086 * L; next, adding dpad filling bits to the second bit set to obtain a third bit set, dpad being an integer greater than or equal to 0; and performing second FEC coding on the third bit set to obtain a fourth bit set.

The invention provides a short-distance high-speed optical fiber communication equalization method and system, and the method comprises the steps: building a Gaussian mixture model for an optical signal subjected to the quadrature amplitude modulation of a set order, and completing the parameter initialization of the Gaussian mixture model through a particle swarm optimization algorithm of which the inertia weight is firstly increased and then decreased; the method comprises the following steps: inputting data features of two dimensions of an in-phase component and an orthogonal component of data into a Gaussian mixture model, then solving parameters of the Gaussian mixture model by using an expectation maximization algorithm, and determining the membership degree of each data point and a clustering label corresponding to each unary Gaussian distribution through the parameters; and through the maximum posterior probability, the data are distributed to the corresponding clustering labels, and nonlinear equalization is completed. According to the method, the memory property of signal nonlinear impairment can be accurately captured, the nonlinear clustering precision is improved, and the calculation complexity of a nonlinear clustering model is reduced under the same clustering effect.

The invention relates to the technical field of ranging and positioning, in particular to a high-precision optical communication ranging and positioning method and system suitable for underwater. The method comprises the following steps: S1, generating and sending a laser signal through a laser; s2, encoding data to be transmitted and modulating the data to a laser signal through a quadrature amplitude modulation scheme for data transmission; s3, emitting the modulated laser signal, aligning the modulated laser signal with a target, and receiving an optical signal returned from target equipment; s4, demodulating the received laser signal based on a coherent demodulation method, and recovering information loaded by the laser signal; and S5, after receiving the demodulated signal, calculating the relative distance by using the distance measurement frame information contained in the signal through a distance measurement positioning unit. According to the invention, the laser communication technology is applied to underwater, and the flight time distance measurement positioning technology is combined, so that the advantages of high precision, high anti-interference performance and low energy consumption are satisfied under the condition of low power consumption.

The invention discloses a high-speed bionic covert communication method and system based on quadrature amplitude modulation. The method comprises the steps that a transmitting end transmits a bionic communication signal, a receiving end receives the bionic communication signal, and the bionic communication signal is generated through the following steps that information to be transmitted is coded in the form of a binary sequence, and a standard orthogonal amplitude mapping constellation diagram is adopted; mapping the coded binary sequence into a corresponding complex exponential sequence; converting an original dolphin click signal into a corresponding analytic signal based on Hilbert transform, and multiplying the analytic signal with the obtained complex exponential sequence to complete orthogonal amplitude modulation to obtain a code element sequence; dividing a plurality of adjacent code elements into a group, and inserting a training symbol in front of each group to obtain a frame of signal; and inserting the synchronizing signal into the front end of a frame of signal to obtain a bionic communication signal. According to the method, the high-bandwidth dolphin signal is selected as a carrier wave, the Hilbert transform is utilized to carry out amplitude and phase regulation and control on the signal in a time domain, the information is modulated in the amplitude and phase of click, the bandwidth utilization rate is high, the communication rate is up to 22.162 kbit / s under the hexadecimal system, and the data transmission capability of bionic covert communication is greatly improved.

The invention discloses a transmission type communication system and method based on low-frequency carrier waves and high-frequency modulation. The transmission type communication system and method are suitable for complex medium environments such as deep sea, strata and biological tissues. Aiming at the contradiction that the traditional low-frequency communication bandwidth is insufficient and the high-frequency communication penetrating power is poor, according to the scheme, a low-frequency carrier wave (30Hz-100kHz) and a high-frequency modulation signal (such as OFDM (Orthogonal Frequency Division Multiplexing) and 256QAM (Quadrature Amplitude Modulation)) are fused through a nonlinear signal superposition technology to generate a composite carrier wave signal, long-distance penetration is realized by utilizing the low attenuation characteristic of the low-frequency carrier wave, and meanwhile, the data rate is improved through high-frequency modulation. Application scenes comprise deep sea detection (300-meter high-definition video return), a brain-computer interface (implantable antenna transmission neural signal) and an intelligent power grid (underground pipe network monitoring). Through the physical layer-information layer collaborative design, the physical boundary limitation of traditional communication is broken through, and high penetrability, high bandwidth and strong anti-interference capability are achieved.

The invention provides a communication and perception joint optimization method based on a space-time coding metasurface. The method comprises the following steps: step 1, modulating and sending symbols by adopting a quadrature amplitude modulation scheme; 2, performing real-time regulation and control on the programmable metasurface; step 3, the integrated multi-antenna receiver separates received signals with different frequencies by using orthogonality between harmonic waves, wherein different harmonic waves respectively correspond to a communication signal and a target echo signal; step 4, constructing a joint optimization problem model of communication and perception performance indexes; and 5, designing an improved algorithm based on a non-dominated sorting genetic algorithm to jointly optimize the communication SNR and the sensing CRB so as to improve the communication performance by using sensing assistance. According to the invention, the communication information demodulated by the zero-order harmonic can be utilized to realize the sensing of the other-order harmonic, and the sensing information of the other-order harmonic can be utilized to enhance the communication performance.

An enhanced link adaptation (eELA) method includes receiving, by a responding device from a requesting device, a physical layer protocol data unit (PPDU) including an eELA request message, determining, by the responding device, an eELA feedback message comprising unequal quadrature amplitude modulation (UEQM) information across a plurality of spatial streams based on at least the number of spatial streams derived from the eELA request message or the PPDU, and transmitting, from the responding device to the requesting device, the eELA feedback message. The UEQM information indicates an effective Signal-to-Noise Ratio (SNR) per spatial stream or a derivative of the effective SNR per spatial stream.

The invention discloses a hollow-core optical fiber communication method and system for reducing complexity, and the method comprises the steps: obtaining original bit data, and mapping the original bit data to an initial constellation diagram through a quadrature amplitude modulation mapping algorithm; rotating the initial constellation diagram according to a preset rotation angle to obtain a first constellation optimization diagram, adjusting the first constellation optimization diagram by using a sparrow search algorithm to obtain a second constellation optimization diagram, converting the second constellation optimization diagram into a transmission signal, and transmitting the transmission signal to the receiving end through a hollow-core optical fiber; performing data preprocessing on the received transmission signal to obtain a de-noised signal, performing phase recovery on the de-noised signal based on a quadratic algorithm to obtain a second constellation optimization graph, and performing de-mapping on the second constellation optimization graph to re-convert the second constellation optimization graph into original bit data; according to the invention, the complexity of digital signal processing is reduced, and the accuracy and efficiency of phase recovery are obviously improved, so that the performance of a coherent optical communication system based on the hollow-core optical fiber is comprehensively improved.

The invention relates to the technical field of visible light positioning, and provides an end-to-end indoor visible light positioning method and system based on pilot frequency sequence characteristics, and the method comprises the following steps: transmitting a visible light signal through an orthogonal frequency division multiplexing and orthogonal amplitude modulation mode, and extracting a pilot frequency sequence; extracting local spatial features of the pilot signals and converting the local spatial features into sequence embedding features; time sequence modeling is carried out on the embedded features, and key features are extracted; performing full connection and nonlinear mapping on the key features, and retaining original features through residual connection; and a Kolmogorov-Arnold network is utilized to carry out positioning. Aiming at the problems of channel estimation dependence, high calculation complexity, high data demand, low signal-to-noise ratio, poor adaptability and the like in the existing indoor visible light positioning system, the real-time performance, the robustness and the calculation efficiency of the system are improved based on end-to-end deep learning indoor positioning of the pilot signal fusion LumiLocNet network.

The invention discloses a multi-band modulation signal generation method based on OQAM, and a frequency spectrum wireless transmission method and system. The method comprises the following steps: a transmitting end performs OQAM preprocessing and modulation on original data flow to realize subcarrier multiplexing; and the receiving end is used for sampling the received signal, and down-conversion, demodulation and original data recovery of the signal are completed through a DSP (Digital Signal Processor) processing module. The multi-subcarrier staggered orthogonal amplitude modulation technology is combined, the spectrum efficiency is effectively improved, interference among subcarriers is avoided, and efficient spectrum utilization, low-cost transmission and multi-user access are achieved.

The invention discloses an encryption transmission method in satellite communication, and belongs to the technical field of encryption. The method comprises the following steps of: partitioning satellite communication data, splitting each data block according to odd and even bits, respectively constructing an odd-bit encryption key and an even-bit encryption key, encrypting corresponding data sub-blocks, and restoring the encrypted data sub-blocks into initial encrypted data blocks; and then generating a shift number according to the encrypted sub-blocks, performing shift processing on the initial encrypted data block, and finally performing quadrature amplitude modulation to obtain a satellite transmission signal. Through the multi-step and multi-dimensional encryption mode, the encryption strength of the satellite communication data is remarkably improved, and the security of data transmission is enhanced.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication method, device and system, and the method comprises the steps: generating a transmission frame which comprises a plurality of OFDM symbols; a first OFDM symbol of the transmission frame is a synchronous pilot symbol, and a second OFDM symbol is a reference pilot symbol; based on the transmission frame, configuring at least two demodulation modes according to channel conditions or communication requirements; when the first demodulation mode is configured, the receiving end performs differential phase shift keying differential demodulation on subsequent data symbols based on the reference pilot symbols; and when a second demodulation mode is configured, the receiving end performs channel estimation by using the reference pilot symbol, and performs quadrature amplitude modulation equalization and demodulation on subsequent data symbols according to a channel estimation result. According to the invention, ultralow pilot frequency overhead can be realized, the pilot frequency overhead is compressed to only two symbols, a synchronization sequence and a reference pilot frequency sequence in each frame, and the frequency spectrum utilization rate is greatly improved.

This application provides a short-range wireless communication method and a related device. The method includes: generating a transmission frame. The transmission frame includes a frame header and a data domain, phase shift keying modulation is used for the frame header, and quadrature amplitude modulation or phase shift keying modulation is used for the data domain. The method includes sending the transmission frame. In this application, the phase shift keying modulation is used for the frame header of the transmission frame, and the phase shift keying modulation or the quadrature amplitude modulation with a same bandwidth is used for the data domain.

The present application provides a signal modulation identification method, device, equipment and storage medium, wherein the method includes: obtaining a signal to be identified; generating an equipotential star map corresponding to the signal to be identified according to the signal to be identified; inputting the equipotential star map into a first signal identification model for initial identification to obtain an initial signal category of the signal to be identified; judging the signal category of the signal to be identified, and if the signal category of the signal to be identified is multi-base orthogonal amplitude modulation, determining the target signal type of the signal to be identified, and performing secondary identification on the signal to be identified based on a second signal identification model corresponding to the target signal type, to obtain an identification result of the signal to be identified. The present application can ensure the accuracy of signal modulation identification, and at the same time, improve the generalization ability of signal identification, and, due to the secondary identification, also enhance the anti-interference ability of signal modulation identification, and realize the rapid and accurate identification of digital modulated signals.

A sourceless co-packaged optical-electrical chip can include a plurality of different optical transceivers, each of which can transmit to an external destination or internal components. Each of the transceivers can be configured for a different modulation format, such as different pulse amplitude, phase shift key, and quadrature amplitude modulation formats. Different light sources provide light for processing by the transceivers, where the light source and transceivers can be configured for different applications (e.g., different distances) and data rates. An optical coupler can combine the light for the different transceivers for input into the sourceless co-packaged optical-electrical chip via a polarization maintaining media (e.g., polarization maintaining few mode fiber and polarization maintaining single mode fiber), where another coupler operates in splitting mode to separate the different channels of light for the different transceivers according to different co-packaged configurations.

A data transmission system includes a transmitter circuit. The transmitter circuit receives regular data bits and auxiliary data bits. The transmitter circuit encodes a first subset of the regular data bits to generate a first subset of encoded data comprising pairs of symbols that are used in quadrature amplitude modulation. The transmitter circuit encodes the auxiliary data bits and a second subset of the regular data bits to generate a second subset of the encoded data comprising at least one pair of symbols that are unused for encoding by the quadrature amplitude modulation. The transmitter circuit generates a modulated output signal that indicates the first and second subsets of the encoded data using pulse amplitude modulation.

The application discloses a kind of optical fiber communication method and system based on anti-pattern gorilla algorithm, comprising: obtaining original bit data to be sent;Original bit data is mapped to constellation diagram by quadrature amplitude modulation mapping algorithm and converted into optical fiber transmission signal;Optical fiber transmission signal is transmitted to receiving end by few-mode channel;The received optical fiber transmission signal is converted into receiving bit data by analog-digital conversion, and receiving bit data is decomposed into leading receiving information and text receiving information;Mode coupling matrix and mode transmission matrix are generated from leading receiving information using anti-pattern gorilla algorithm;Text receiving information is corrected using mode coupling matrix and mode transmission matrix to obtain correction signal, and correction signal is demapped and converted into original bit data again;Reduce the waste of computing resources caused by mode equalization technology and the equalization deviation caused, improve the quality of quadrature mode signal transmission.

Provided are a configuration method and apparatus, a receiving method and apparatus, a device, and a storage medium. The configuration method includes: determining a modulation and coding scheme (MCS) set based on a higher-layer configuration parameter; and configuring an MCS of data based on the MCS set; where the higher-layer configuration parameter indicates whether data transmission supports a 16 quadrature amplitude modulation (16QAM) modulation scheme, and the MCS set includes one or more of: a first MCS set and a second MCS set.

The application discloses a layered quadrature amplitude modulation multiple access method without serial interference cancellation. User bits are mapped to constellation points of different levels, and the Euclidean distance between constellation points in each level is set according to the channel gain of the user, that is, the power of each user is adjusted. Finally, after superposition of multi-level constellation points, hierarchical constellation points are formed to carry the bits of multiple users. On this basis, multiple working configuration points are set, and one or more working configuration points are selected to complete the transmission task according to the number of users in the current transmission and the rate requirement of the user. The transmitter sends the corresponding position of each user in the bit string mapped by the constellation point, the Euclidean distance between the constellation points in each level and the corresponding origin in the complete constellation diagram to the receiver, and if multiple working configuration points are selected, the working configuration point matching information can enable the user to achieve the maximum capacity limit of the downlink multi-user transmission service without serial interference cancellation.

According to a first embodiment, a method may include transmitting to at least one user equipment at least one configuration of channel quality indication comprising at least one indication of whether downlink transmissions associated with 16-quadrature amplitude modulation is supported. The method may further include receiving, based upon at least one condition being satisfied, from the at least one user equipment, at least one extended channel quality indication report.

The application relates to a kind of coherent detection space light cooperation transmission methods based on local oscillator elastic light splitting, belong to space light communication technical field.The method includes: in optical transmitting terminal, bit sequence is modulated into optical signal using quadrature amplitude modulation method, then is divided into multiple channel uncorrelated sub-signals for broadcast transmission through fixed optical splitter;In optical receiving terminal, the signal transmitted by even-numbered link is phase-shifted through 90 degree phase shifter, and the phase orthogonality of even-numbered link and odd-numbered link signal is realized;At the same time, through elastic optical splitter, local oscillator light power is adaptively allocated to the photodetector corresponding to each link;The bit sequence is restored after the output signal of photodetector is demodulated through coherent receiver.The power distribution of elastic optical splitter is controlled by voltage controller, wherein the output voltage of voltage controller is dynamically determined according to the state of atmospheric channel by DDPG algorithm.The application can flexibly cope with the influence of different atmospheric channel conditions on transmission performance.

Methods and systems for improved data transmission using audio transmissions are provided. In one embodiment, a method is provided that includes receiving an audio transmission at. Audio symbols may be identified within the audio transmission, and a magnitude and phase for each of the symbols may be identified. Based on the magnitudes and phases, corresponding data values may be identified for each of the audio symbols and may be combined to form a data payload of the audio transmission.

The present invention discloses a method for reducing PAPR in an F-OFDM system, which relates to the technical fields of electronic information and digital signal processing, and includes the following steps: S1: Divide the spectrum into M sub-bands; S2: Perform quadrature amplitude modulation on the input signal respectively and then perform subcarrier mapping to obtain M output signals; S3: Divide the time-domain data after the inverse discrete Fourier transform of the M output signals into V groups, each group containing M / V sub-band signals with a length of N; S4: Sum the sub-band signals in each group through complex addition; S5: Generate a cyclic shift vector of length K [s1, s2, …, s k , and a total of K V phase combinations are generated; S6: Superimpose the phase combinations to obtain corresponding candidate signals; S7: Calculate the PAPR values of all candidate signals, and select the candidate signal with the smallest PAPR value for transmission; By generating candidate signals, the present invention reduces the PAPR value in the system and improves the PAPR suppression performance.

The application discloses a simple receiving multiple access method based on symbol and bit stream joint distribution, first, a transmitter distributes symbol streams and bit streams of each user based on a hierarchical quadrature amplitude modulation constellation diagram; different interference management schemes are adopted for inter-user interference in different beams and inter-user interference in the same beam to inhibit the influence of inter-user interference on system performance; channel equalization processing is performed on signals received by each user receiver, each user calculates log likelihood ratios of each bit stream allocated to each user according to a bit stream distribution result, and the calculation result is sent into a channel decoder to obtain original bit data. The above method jointly optimizes symbol and bit stream distribution schemes of each user and constellation diagram design, and can realize efficient user access in a large-scale access scene while satisfying a constraint condition of signal processing complexity of the receiver.

The invention relates to a coherent detection spatial light cooperative transmission method based on local oscillator elastic light splitting, and belongs to the technical field of spatial light communication. The method comprises the following steps: at an optical transmitting end, modulating a bit sequence into an optical signal by adopting a quadrature amplitude modulation method, and then dividing the optical signal into a plurality of channel-irrelevant sub-signals through a fixed optical splitter for broadcast transmission; at a light receiving end, the signals transmitted by the even-numbered links are subjected to phase shifting through a 90-degree phase shifter, and phase orthogonality of the signals of the even-numbered links and the odd-numbered links is achieved; meanwhile, local oscillation optical power is distributed to the photoelectric detectors corresponding to the links in a self-adaptive mode through an elastic optical splitter; and an output signal of the photoelectric detector is demodulated by the coherent receiver to restore a bit sequence. The power distribution of the elastic optical splitter is controlled by a voltage controller, and the output voltage of the voltage controller is dynamically determined according to the atmospheric channel state through a DDPG algorithm. The method can flexibly cope with the influence of different atmospheric channel conditions on the transmission performance.

The present invention discloses a privacy-preserving orthogonal amplitude modulation method for wireless distributed learning. The method is aimed at processing floating-point data in communication between a central server and a client: the client uses random sparsification processing of shared random numbers to reduce the amount of data transmitted; then, modulated data is obtained after random encoding and orthogonal amplitude modulation using probability parameters in random sparsification; the modulated data is sent to the central server via wireless communication, and then binary demodulated data is obtained after orthogonal amplitude demodulation. The demodulated data is decoded using probability parameters in random sparsification using shared random numbers to obtain restored data of the client's updated data. The present invention can effectively improve communication efficiency while meeting the requirements of privacy protection and accuracy, and effectively solves the two major challenges of privacy protection and communication efficiency faced by distributed learning in wireless communication scenarios, and the accuracy shows good robustness to the signal-to-noise ratio.

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a wireless communication device can receive a wireless communication signal. The wireless communication device can process the wireless communication signal using a digital post-distortion receiver based at least in part on performing a multi-level coding (MLC) set partitioning operation, where performing the MLC set partitioning operation includes partitioning a quadrature amplitude modulation constellation set by limiting a maximum Euclidean distance of errors associated with decoding one or more least significant bits. Numerous other aspects are provided.

The application provides a configuration method, a receiving method, a device, equipment and a storage medium. The method comprises the following steps: determining a modulation and coding strategy (MCS) set based on a high-level configuration parameter; and configuring the MCS of data based on the MCS set. The high-level configuration parameter indicates whether a 16 quadrature amplitude modulation (16QAM) mode is supported in data transmission. The MCS set comprises one or more of the following: a first MCS set and a second MCS set.