97 results about "Symbol period" patented technology

The invention provides an optical-electric hybrid ultra-low time delay communication method and system, and relates to the technical field of communication, and the method comprises the steps: outputting a global synchronous clock signal with clock jitter less than 1ppm, dynamically dividing micro time slot resources in an orthogonal frequency division multiplexing symbol period, and generating a dynamically adjusted micro time slot resource distribution result; calculating an optimal phase offset matrix of the metasurface intelligent reflecting surface through a depth deterministic strategy gradient algorithm to obtain an optimized electromagnetic wave propagation path; generating a global optimization check matrix by aggregating the locally trained lightweight error correction model gradient of each node to obtain a compensated data stream; and constructing a causal graph model dynamic pruning high-entropy path to minimize causal entropy, through multi-agent reinforcement learning, taking time delay-energy efficiency as a game target to decide an optimal modulation order and a subcarrier switching strategy, and obtaining an optimized stable communication link. According to the invention, high-reliability and low-delay communication basic support is provided for high-precision intelligent manufacturing.

A circuit may include an input to receive a signal corresponding to a radio frequency signal received at each element of an antenna array. The circuit may include a beamforming circuit configured to determine two or more samples of a symbol period of the signal from each antenna element and to determine the error estimates for each antenna element based on the two or more samples. The beamforming circuit may be configured to determine one of a line or a plane that best fits the error estimates; determine a direction of arrival of the radio frequency signal based on one or more parameters of the line or the plane and determine a fractional delay for each antenna element based on the direction of arrival of the radio frequency signal.

The application discloses a frame synchronization-based laser communication and ranging integrated system, and belongs to the technical field of satellite laser communication.The system solves the problem that ranging precision is limited under the condition of low communication rate.The system comprises a sending end and a receiving end, wherein the sending end comprises a synchronization header sequence generating module, a data sequence generating module and a framing module, the receiving end comprises a synchronization sliding correlation / rough ranging calculation module, a fine ranging calculation module and a data sequence extracting module; the synchronization header sequence generating module generates a synchronization header sequence, the data sequence generating module generates a data sequence, and the framing module completes splicing of the synchronization header sequence and the data sequence; the synchronization sliding correlation / rough ranging calculation module performs frame synchronization and calculates an integer symbol period of transmission delay, the fine ranging calculation module calculates a fractional symbol period of transmission delay, and the data sequence extracting module performs frame disassembly according to a starting position of the synchronization header sequence, extracts the data sequence and completes communication reception.

The invention relates to the technical field of digital demodulation, in particular to a digital demodulation method suitable for deep ultraviolet light communication, which comprises the following steps of: adopting multiple delay processing with half code element width, and respectively carrying out double extraction processing on a discrete sampling signal which is not subjected to delay processing and a plurality of delay sampling signals to obtain a plurality of delay extraction signals; in this way, the key sampling time in the coverage code element period can be ensured, and a basis is provided for subsequent accurate synchronization; a plurality of delay extraction signals are respectively input into corresponding equalization processing units, a preset local training sequence is loaded to each equalization processing unit to obtain a plurality of equalization filtering signals, and the plurality of equalization filtering signals and the preset local training sequence are respectively subjected to related judgment processing, so that the inter-symbol interference is inhibited, and meanwhile, the equalization processing efficiency is improved. The synchronization signal can be quickly screened out, so that the problem that inter-symbol interference and synchronization are difficult to consider in a traditional demodulation method is solved, and the demodulation efficiency and reliability are remarkably improved.

The invention provides a signal transmission method and device, and the method comprises the steps: receiving first information, the first information is used for indicating a first index corresponding to a first signal, the first signal is borne in a single carrier for transmission, the first index is used for indicating a first parameter group in a first incidence relation, and the first parameter group is used for indicating a second parameter group in a second incidence relation; the first association relationship comprises a plurality of indexes and a plurality of parameter groups corresponding to the plurality of indexes respectively, the first parameter group is a parameter group associated with the first index, the parameter group comprises a sampling frequency and / or a symbol rate, the sampling frequency is equal to a sampling frequency corresponding to a subcarrier interval of multiple carriers, and the symbol rate is equal to the sampling frequency corresponding to a subcarrier interval of the multiple carriers. The symbol period determined based on the symbol rate is equal to the symbol period of one subcarrier interval of the multicarrier, and transmitting the first signal according to the first parameter group, so that the communication device can transmit and receive a single-carrier signal and a multicarrier signal through the same set of parameters, thereby reducing the implementation complexity and saving the cost.

Methods, systems, and devices for wireless communications are described. A forwarding device (e.g., a reconfigurable intelligent surface (RIS)) may transmit a capability message indicating one or more timing parameters associated with a time duration for the forwarding device to switch a set of forwarding elements from forwarding in a first direction to forwarding in a second direction. The forwarding device may receive, based on the indicated one or more timing parameters, one or more control messages that instructs the forwarding device to forward signal energy in the first direction during a first symbol period and to forward signal energy in the second direction during a second symbol period. The first symbol period may be different from the second symbol period. The forwarding device may include a primary array including a first set of forwarding elements and a secondary array including a second set of forwarding elements.

The invention relates to a motion MPSK communication radiation source speed estimation method. The method comprises the following steps of: firstly, dividing a received MPSK signal into two paths, estimating motion phase deviation in one path by utilizing a minimum mean square error phase discrimination algorithm, compensating the motion phase deviation and demodulating a message symbol carried by the signal; carrying out signal segmentation on the other MPSK signal according to symbol synchronization information and a symbol period, and compensating a phase of a symbol waveform corresponding to a demodulated message symbol according to the demodulated message symbol; and finally, combining symbol waveform data after phase compensation into a two-dimensional matrix, and solving Doppler frequency for data of different symbols at the same sampling moment through a vertical Fourier transform method so as to obtain the speed of a moving target. Compared with a traditional sensing integrated speed measurement method, the method has the advantages of being low in probability of being found and long in operating distance.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) and a base station may communicate using demodulation reference signal enhancements for control channel repetitions. The UE and the base station may identify a configuration to use to receive or transmit a set of repetitions of control information on a downlink control channel, each repetition of the set of repetitions including one or more symbol periods for an instance of the repeated control information. The base station may transmit, and the UE may receive, a first set of demodulation reference signals in accordance with a first set of parameter values, a second set of demodulation reference signals in accordance with a second set of parameter values, and instances of the control information during the set of repetitions. The UE may decode the control information based on the received signals and configuration.

The invention discloses an aircraft control method and device based on sensing and communication integration, equipment and a storage medium, and the method comprises the steps: generating a sensing and communication integration shared waveform based on an obtained sensing symbol frequency modulation sequence, a communication symbol sequence and a symbol period under the condition of triggering an aircraft sensing instruction; the sensing frequency modulation sequence is corrected according to the quantum sensor, the symbol period is corrected according to the quantum radar, and the sensing and communication integrated shared waveform is updated based on the correction result; and determining an interference signal, an interference frequency point and an encryption key corresponding to the aircraft, fusing the interference signal, the interference frequency point and the encryption key with the updating result of the sensing-communication integrated shared waveform, and generating an aircraft sensing-control waveform for performing sensing positioning and interference control on the aircraft. The purpose of effectively controlling the multi-band adaptive aircraft can be achieved, and the control flexibility of the aircraft and the utilization rate of system resources are improved.

The optical transmitter (100) includes a modulation signal generation unit (110) that generates a modulation signal, which is a digital signal in which a first pilot symbol signal having a first symbol period and a second pilot symbol signal having a second symbol period are inserted into data to be transmitted, and an optical modulation unit (130) that modulates CW light from a CW light generation unit (140) based on the modulation signal converted into an analog signal by a digital / analog conversion unit (120) to generate modulated light in which the first pilot symbol signal and the second pilot symbol signal are inserted. The optical receiver (200) includes a modulation signal generation unit (110) that generates a modulation signal, which is a digital signal in which a first pilot symbol signal having a first symbol period and a second pilot symbol signal having a second symbol period are inserted into data to be transmitted, and an optical modulation unit (130) that modulates CW light from a CW light generation unit (140) based on the modulation signal converted into an analog signal by a digital / analog conversion unit (120) to generate modulated light in which the first pilot symbol signal and the second pilot symbol signal are inserted. and a receiving-side digital signal processing unit (240) having a frequency difference compensation unit (247) which calculates a phase difference using the first pilot symbol signal and a second pilot symbol signal adjacent to the first pilot symbol signal, which are extracted from the digital signal from the analog / digital converter unit (230) and inserted into the received polarization multiplexed modulated light, and compensates for the frequency of the received digital signal.

Methods, systems, and apparatus for wireless communications are described. A sidelink message may be scheduled for a UE during a first short transmission time interval (TTI). A first short TTI and a second short TTI for sending a sidelink feedback message corresponding to the sidelink message may be shorter in duration than another, longer type of TTI. The UE may send automatic gain control information in a first symbol period of the second TTI, send the sidelink feedback message in a second symbol period of the second TTI (after the first symbol period of the second TTI), and switch from operating in a transmit mode to operating in a receive mode during a third symbol period of the second TTI (after the second symbol period of the second TTI).

The invention provides a frequency offset estimation error correction method for UWB, and the method comprises the steps: carrying out the correlation operation of a lead code and a local template through a receiver, setting an energy window, extracting a plurality of data in a first window as a first effective interval signal, sliding the window by taking a symbol period Tsym as an interval until multiple pieces of data in a second window are extracted to serve as second effective interval signals; respectively performing conjugate multiplication on sampling points at the same index position of the signals in the first effective interval and the second effective interval, and accumulating conjugate multiplication results in all the intervals to obtain an initial phase difference estimated value; according to a linearly segmented CFO estimation and correction error model, introducing a phase correction factor to correct the initial phase difference estimated value in combination with historical phase difference estimated data to obtain a corrected phase difference estimated value; the corrected phase difference estimated value is used, and an atan2 function is used for calculation to obtain a phase difference radian value; and phase compensation is carried out on subsequent data by using the phase difference radian value as phase rotation stepping.

The present invention relates to a chaotic spread spectrum modulation multi-user access system of a joint PPM for short-distance communication. At the transmitting end, a chaotic signal is generated by a chaotic mapping method, and the chaotic signal is used as a reference segment of the first time slot, and a bit stream is divided into multiple symbol periods, each symbol period is mc+1 bit transmission bits, wherein mc mapping bits determine the selected pulse position of PPM, and 1 bit is modulated by DDCSK-WC; when multiple users transmit information at the same time, the information segment is redesigned by using an orthogonal Walsh code, and then the redesigned information segment is transmitted at the pulse position selected by PPM; at the receiving end, the received signal is multiplied by a corresponding Walsh code according to a certain method, and then the reference segment processed by the Walsh code and the information segment are calculated for correlation characteristics, and the position of the information segment is determined by comparing the absolute value of the correlation characteristic result, thereby judging the corresponding mc mapping bits and 1 modulation bit. The present invention effectively improves data transmission efficiency.

The present invention relates to the field of wireless communication technology, and in particular to a method, device and medium for tracking the phase of a payload based on a training sequence. The method comprises the following steps: generating a local training sequence according to an FSK modulation mode; grouping the received training sequence according to a fixed symbol period, and correlating it with the conjugate of a local pre-phased training sequence; obtaining the phase angle of the correlation sequence using a CORDIC algorithm; accumulating and integrating the phase by group, and updating the phase of the phase modulation; obtaining the final phase deviation value under the current payload training sequence; accumulating and updating the local oscillator phase, and iteratively compensating the actual data of the payload. The present invention improves the estimation accuracy by uniformly inserting the pilot training sequence into the data block, thereby obtaining the average correlation value of the training sequence on multiple consecutive frames, and ensures continuous tracking of the data phase, effectively reducing the bit error rate, and improving the demodulation performance of the receiver.

This invention discloses a pre-equalization compensation method for a terminal in a TDD-OFDM direct conversion system with known transmitter IQI and nonlinear parameters. The method includes: the base station cyclically sending P different training sequences to the terminal; the terminal using a sliding window least squares-based channel state information tracking algorithm to track and estimate the channel state information, where δ is a threshold representing the correlation of the channel within adjacent symbol periods; and pre-equalization compensation performed directly at the terminal. Using the pre-equalization compensation algorithm, a modified data sequence can be obtained and sent to the base station. This invention considers three factors in wireless communication systems: I-path and Q-path imbalance caused by the non-ideal nature of analog components in RF transceivers, power amplifier nonlinearity, and multipath channels. It enables distributed processing within the cell, effectively reducing the demodulation burden on the base station and has wider applicability than traditional compensation methods.

The application discloses a decoding method, device and readable storage medium, and belongs to the technical field of communication. The method comprises the following steps: a decoding end determines a coding coefficient vector according to a received signal and a new space-time block code (NSTBC) codebook; the decoding end determines the power sum of the sending symbols on the sending antenna in the first two symbol periods according to the received signal; and the decoding end decodes original coding input symbols in a current symbol period according to the coding coefficient vector, a differential space-time block code (DSTBC) coding mode, the NSTBC codebook and the power sum of the sending symbols on the sending antenna in the first two symbol periods, wherein the first two symbol periods are two adjacent symbol periods before the current symbol period.

The present invention discloses a Ku-band Starlink downlink signal detection method, comprising the following steps: step 1, a broadband receiver collects signal IQ data, the sampling rate is fs, and the length of the collected sample is L; step 2, the collected complex signal sample is recorded as X(n), n=0, 1, ..., L-2, L-1, and a cyclic correlation algorithm is used to detect the frame period of the signal; step 3, a spectrum peak search is performed on #imgabs0#, wherein the n=10, 11, ..., L / 2-1 part is searched, and the searched maximum spectrum peak position index is recorded as I max ; Step 4, according to I max Calculate the frame period T of the signal in ms. Step 5. Determine whether T satisfies the following formula: #imgabs1#, where #imgabs2# is the frame length of the Starlink downlink signal, #imgabs3# is the redundancy set to avoid multipath interference, and #imgabs4# should satisfy: #imgabs5#; Step 6. Detect the symbol period. For #imgabs6#, detect whether there is a spectral peak near #imgabs7#. If it is satisfied, go to the next step.

The invention discloses a multi-user detection method and device based on an expansion factor graph and a graph attention network, and the method comprises the steps: carrying out the multi-time oversampling of an asynchronous uplink signal of a receiving end, obtaining a plurality of sampling observations in each symbol period, and constructing the expansion factor graph based on the sampling observations; performing feature extraction on the oversampling receiving signal, and taking a real part and an imaginary part as deep neural network input to obtain node features; and a graph attention network is introduced into the expansion factor graph to carry out information interaction and model training, and a model obtained by training is utilized to judge signals received by each user, so that multi-user joint detection is realized. According to the method, the oversampling signal is modeled into the expansion factor graph structure, and the graph attention mechanism is introduced, so that effective detection of the multi-user signal in the asynchronous SCMA system is realized, and the problems of high multi-user detection complexity and insufficient asynchronous interference resistance in an uplink asynchronous SCMA scene are solved.

The application provides a signal demodulation method, device, receiver and computer readable storage medium. The method comprises: obtaining a first baseband envelope signal in a first symbol period; a logic level of the first baseband envelope signal is a normal bit level; obtaining a second baseband envelope signal in a second symbol period; the second symbol period is a backward period of the first symbol period; determining an average value of the first baseband envelope signal to obtain a first average value; performing a direct current removal on the second baseband envelope signal according to the first average value to obtain a reference second signal; and determining a logic level of the second baseband envelope signal according to the reference second signal. The method can determine an abnormal bit level and improve the accuracy of logic level determination.

The invention belongs to the technical field of wireless communication, and discloses a frequency collision array signal separation method based on a channel matrix, which comprises the following steps: two radiation sources emit signals with the same symbol rate, and two antennas receive frequency collision signals according to a symbol period; establishing a convolution matrix based on a channel tap coefficient, and constructing a channel matrix according to the convolution matrix; constructing a frequency collision array signal model received by the two antennas according to the channel matrix, the sending signal sequences of the different radiation sources and the additive white Gaussian noise matrix; and carrying out pseudo-inverse on the convolution matrix in the frequency collision array signal model received by the two antennas, and separating the sending signal sequences of the two radiation sources. Based on the channel matrix, the method solves the problem that the communication is limited due to the fact that single-channel frequency collision signals cannot be demodulated independently, simplifies the calculation process of signal separation, and improves the communication reliability when the frequency is crowded.

The present application discloses an encoding method, an encoding apparatus and a readable storage medium, which belong to the field of communication technology, and includes: an encoding end obtains a transmission symbol of a current symbol period by encoding according to a DSTBC encoding scheme, an NSTBC codebook and a power sum of transmission symbols on a transmission antenna for the first two symbol periods; and the encoding end determines a transmission symbol of a symbol period next to the current symbol period according to the transmission symbol of the current symbol period and the NSTBC codebook, where the first two symbol periods are two adjacent symbol periods before the current symbol period.

A method (200) for generating coded scattered SSB signal (108A) for enhanced initial access. The method (200) includes receiving, at a digitally controllable scatterer, DCS, device (104), a synchronization signal block, SSB, signal (108), transmitted from a base station, BS (110), of a wireless communications network. The method (200) further includes generating at least one coded scattered SSB signal (108A) by taking the received SSB signal at the DCS (104) as an input, the coded scattered SSB signal (108A) being scattered via a DCS generated beam, wherein a start of a DCS coding used to generate the coded scattered SSB signal (108A) at the DCS device (104) is a function of the time of arrival of the received SSB signal at the DCS (104), wherein a DCS code period of the DCS coding is a function of a symbol period of the received SSB signal at the DCS (104), wherein the SSB signal (108) and the coded scattered SSB signal (108A) are orthogonal or semi-orthogonal.

Provided is a decoding method using polarization time block coding (PTBC) and a decoding device for performing the decoding method. The decoding method includes branching received symbols consecutively received according to a symbol period into two paths, delaying a first received symbol corresponding to a first path between the two paths by the symbol period in which the received symbols are received, performing a complex conjugate operation on a second received symbol corresponding to a second path between the two paths, compensating for channel distortion of the first received symbol delayed by the symbol period and the second received symbol on which the complex conjugate operation is performed, through an equalizer in the decoding device, and restoring a transmission symbol by performing phase restoration on the first received symbol and the second received symbol for which the channel distortion is compensated for, through a phase compensator in the decoding device.

The invention discloses an information transmission method and device, communication equipment and a readable storage medium, and belongs to the technical field of communication. The information transmission method comprises the following steps: a first device performs chirp spread spectrum CSS modulation on bit information to be transmitted to obtain a CSS modulation signal; transmitting the CSS modulation signal; a CSS symbol in the CSS modulation signal satisfies at least one of the following items: representing different bit information through different starting frequency sweeping frequency points in the CSS symbol; the number n of bits carried by one CSS symbol and the number N of initial frequency sweeping frequency points or initial frequency sweeping frequency points used for modulation in the CSS symbol meet the following condition: 2n = N; the number N of initial frequency sweeping frequency points used for modulation in the CSS symbols meets the condition that N is smaller than or equal to M, and M represents the number of frequency points or the number of frequencies in a CSS frequency sweeping range or a CSS frequency sweeping bandwidth; for the CSS symbol with the initial frequency sweeping frequency point, the frequency sweeping frequency point or the frequency sweeping frequency in the symbol period of the CSS symbol and the frequency sweeping time meet at least one of the following items: a linear function relation and a nonlinear function relation.

The invention provides a communication method, device and system, electronic equipment and a readable storage medium, and the method comprises the steps: receiving a plurality of sounding reference signals SRS from a terminal, any one SRS corresponding to a symbol period, and any one SRS corresponding to an antenna characteristic of the terminal; determining channel information corresponding to each antenna characteristic based on the plurality of SRS signals; determining a target antenna switching combination based on the channel information; and sending indication information to the terminal, wherein the indication information is used for indicating the terminal to communicate according to the target antenna switching combination. Compared with the prior art that when the symbol period changes, the antenna characteristics change to cause mutual superposition of signals and cause difficulty in distinguishing, since only the SRS with one antenna characteristic is sent in one symbol period, the problem of mutual superposition of different transmission channels is avoided, the channel capacity is further improved, the bit error rate is further reduced, and the signal transmission efficiency is improved. Therefore, the performance of the communication system is improved.

Provided is a decoding method using polarization time block coding (PTBC) and a decoding device for performing the decoding method. The decoding method includes branching received symbols consecutively received according to a symbol period into two paths, delaying a first received symbol corresponding to a first path between the two paths by the symbol period in which the received symbols are received, performing a complex conjugate operation on a second received symbol corresponding to a second path between the two paths, compensating for channel distortion of the first received symbol delayed by the symbol period and the second received symbol on which the complex conjugate operation is performed, through an equalizer in the decoding device, and restoring a transmission symbol by performing phase restoration on the first received symbol and the second received symbol for which the channel distortion is compensated for, through a phase compensator in the decoding device.

This invention discloses a decoding method, apparatus, module, and computer-readable storage medium. The decoding method includes obtaining an initial symbol period and calculating a sampling interval based on the initial symbol period. It involves sampling the transition edges of the encoded data within the sampling interval, calculating the actual symbol period based on the sampling interval, updating the value of the sampling interval based on the actual symbol period, and continuing to sample the transition edges of the encoded data within the updated sampling interval. Finally, it involves decoding the encoded data based on the sampling results. The decoding method, apparatus, module, and computer-readable storage medium of this invention can dynamically adjust the sampling interval for each symbol. For Manchester encoding affected by noise, even when the period is inaccurate or the duty cycle is not 50%, it can still successfully identify symbols, improving the decoding success rate.

The invention discloses an infrared transmitting device and method, an infrared receiving device and an infrared communication system, and relates to the technical field of infrared communication. The infrared transmitting device comprises a first processor used for modulating to-be-transmitted information with a preset bit length to obtain N first digital signals and outputting the N first digital signals in a target symbol period in sequence according to a target sequence, the preset bit length is larger than 1 bit length, N is an integer larger than 1 and smaller than or equal to Nmax, and N is an integer larger than 1 and smaller than or equal to Nmax; the Nmax is determined according to the target symbol period; the first control circuit is used for outputting a first control signal according to the first digital signal; and the infrared transmitter is used for transmitting an infrared signal under the control of the first control signal. According to the infrared communication device, the information to be sent is converted into the N infrared signals sent in the target symbol period, so that information sending with the preset bit length can be realized, and the spectrum utilization rate and the data transmission rate of infrared communication are improved.

The present invention provides a method for estimating the symbol period and symbol synchronization of a rectangular pulse-shaped digital communication signal, belonging to the field of communication technology. A dynamic matrix is constructed to distinguish different symbol data; based on the dynamic matrix, the larger value of the average values obtained from two segmented matrices is taken as S[M], and the absolute value waveform of the difference of S[M] is obtained cyclically, and the initial estimate of the symbol period is obtained according to the maximum point; further, according to the initial estimate, the symbol period estimate value is obtained to achieve symbol synchronization on the basis of the symbol period estimate value. Without knowing the signal modulation system, the present invention does not add additional steps for identifying the modulation system, but directly provides a general method for estimating the symbol period of rectangular pulse-shaped digital communication signals of various different typical systems, and realizes symbol synchronization on the basis of estimating the symbol period, simplifying the entire estimation process and reducing the difficulty of hardware implementation compared with the prior art.

The invention provides a data encryption system and method based on microwave transmission, and relates to the technical field of data encryption methods, and the method comprises the steps: constructing a Lorenz chaos model through employing a single-variable time delay method, carrying out the iterative updating of a chaos variable value in the Lorenz chaos model through employing a fourth-order Runge-Kutta method, and simulating and generating an unpredictable continuous chaos trajectory; symbol periods of the chaotic trajectory are set, and a key stream corresponding to each symbol period is generated; and calculating the phase deviation of the current symbol period by adopting modular operation, calculating the frequency deviation of the current symbol period by adopting a dynamic frequency modulation method, and generating a microwave carrier signal. The key stream based on the Lorenz chaos model has initial value sensitivity and long-term unpredictability, and an independent dynamic key is generated in each symbol period, so that the global security is not influenced; through modular operation and dynamic frequency modulation, an encrypted signal has noise-like spectrum characteristics and time-varying characteristics.