74 results about "Guard interval" patented technology

The invention relates to the technical field of PLC control, in particular to a PLC communication expansion system and method supporting modular dynamic reconfiguration, and the system adopts a physically isolated biplane bus architecture, and comprises a process interaction unit for maintaining a deterministic interpolation period containing a preset fixed bit wide shadow time slot, the configuration management unit is used for acquiring parameters through an independent serial bus, the motion resolving unit verifies data suitability and loads drive in the background, meanwhile, coordinate system zero point offset vectors of new and old models are resolved in parallel based on real-time position feedback, the undisturbed switching unit responds to a ready signal, atomic operation is executed in an inter-frame protection gap, and a new and old model is obtained. The shadow time slot is mapped to the new module, and the offset vector is used as a feedforward injection motion instruction. According to the invention, zero-jitter undisturbed dynamic reconstruction is realized through dual-plane and atom switching.

A method, network node and wireless device (WD) to perform procedures based on a beam identification (ID) update guard interval are disclosed. According to one aspect, a method in a network node includes configuring a beam ID update guard period during which the WD is configured to assume that a same network node spatial filter is used during the beam ID update guard period unless otherwise indicated by the network node. The method also includes transmitting an indication of the configuration to the WD.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication channel estimation and signal detection method and system, and belongs to the technical field of channel estimation. The OFDM communication channel estimation and signal detection method comprises the following steps: receiving an LDACS downlink OFDM baseband signal; pilot frequency and data subcarriers are separated; arranging pilot frequency observation into a time sequence block according to a frequency index, and constructing a channel estimation subnet input tensor; performing convolution feature extraction and LSTM (Long Short Term Memory) time sequence modeling on the pilot frequency time sequence block in sequence, and outputting channel estimation of each subcarrier; performing frequency domain equalization on the data subcarriers; the signal detection subnet firstly extracts time sequence features through LSTM, then distributes weights through a self-attention mechanism, and finally outputs bit judgment through full connection; performing parameter optimization on the channel estimation subnet and the signal detection subnet by adopting a two-stage training strategy; the number K of subcarriers, the number P of pilots, the CP length and subcarrier mapping are set according to an LDACS frame structure and a protection interval, and an LDACS link layer interface is directly connected. By adopting the OFDM communication channel estimation and signal detection method and system provided by the invention, the problems of poor estimation precision and insufficient robustness of the existing method in a complex LDACS airspace channel environment can be solved.

The invention discloses a frequency-modulated continuous wave laser radar signal generation method, a frequency-modulated continuous wave laser radar signal detection method and a frequency-modulated continuous wave laser radar signal detection system. The system comprises a transmitting end and a receiving end, wherein the transmitting end determines a frequency guard interval between a frequency-modulated continuous wave signal and zero frequency according to a modulation bandwidth of a radar signal and a line width of a transmitting laser; generating a frequency modulation continuous wave signal according to the frequency protection interval, modulating the frequency modulation continuous wave signal, generating radar detection signal light which is to be sent and contains residual carrier waves, performing power amplification on the radar detection signal light, and transmitting the radar detection signal light by using an optical lens; the receiving end receives the reflected signal light reflected by the target; filtering, beat frequency and coherent detection are carried out on the reflected signal light and the radar detection signal light to obtain an electric signal, and the electric signal is converted into a digital signal; performing electric domain filtering on the digital signal, and extracting a residual carrier and a beat frequency signal; performing phase noise compensation on the beat frequency signal based on the residual carrier to obtain a signal after phase recovery; and estimating the distance and the relative speed of the target based on the residual carrier and the phase-recovered signal.

A station (STA) may include a processing device. The processing device may select, at a STA for transmission to an access point (AP), a long training field (LTF) mode in which the LTF mode is 4×LTF. The processing device may select, at the STA for the transmission to the AP, a first guard interval having a value of less than 3.2 μs in which the first guard interval is used for one or more of training symbols or data symbols. The STA may include a transceiver. The transceiver may transmit, from the STA to the AP, the transmission using the LTF mode and the first guard interval. The transceiver may transmit, from the STA to the AP, the transmission using one or more distributed resource units (DRUs).

This invention discloses a waveform design method for integrated communication and sensing based on a multi-objective particle swarm optimization algorithm, relating to radar detection technology and communication technology. The method includes: constructing a multi-objective optimization problem for waveform parameter design using the subcarrier weight coefficients of the OQAM-OFDM integrated communication and sensing waveform as optimization variables; using the maximization of the sum of the signal-to-noise ratios (SNRs) of all subcarrier communication outputs as the optimization criterion for waveform parameter design; using the maximization of the sum of the SNRs of all range resolution units' sensing outputs as the optimization criterion for waveform parameter design; solving the multi-objective optimization problem for waveform parameter design using the multi-objective particle swarm optimization algorithm to obtain several non-dominated solutions for the subcarrier weight coefficients that simultaneously maximize both the communication output SNR and the sensing output SNR; and forming a Pareto front from these non-dominated solutions. The waveform designed in this invention can effectively resist multipath interference without using cyclic prefixes and blank guard intervals, exhibiting high resource utilization efficiency and excellent sensing and communication performance.

The application relates to the technical field of multi-path data transmission, and discloses an electric energy meter reading system and method based on the Internet of Things, which comprises the following steps: dividing a target electric energy meter into a meter reading domain, establishing a power frequency phase synchronization reference and a double pilot subcarrier, controlling the electric energy meter to perform pilot loopback sampling, extracting pilot complex sampling values, calculating group time delay tail scheduling according to the pilot complex sampling values, and generating a multiplexed meter reading time slot table containing a guard interval and an uplink starting time; then, sending a downlink inquiry frame according to the scheduling sequence; freezing and sending data of the electric energy meter at a specified time; and finally, receiving, decoding and outputting a telemetry data set by the concentrator. The application can effectively avoid inter-symbol interference caused by group time delay tailing, and improve the meter reading success rate.

The invention provides an ultra-far coverage method and device applied to wireless communication and related products, wireless parameters and environmental parameters of a current period are obtained, the wireless parameters at least comprise signal round-trip propagation time delay, and the environmental parameters at least comprise one of terrain, weather and base station load; inputting the wireless parameters, the environmental parameters and the target coverage distance into a pre-trained first prediction model, and outputting a guard interval GP prediction value; wherein the first prediction model is obtained by training a deep learning model based on a historical wireless parameter data set, a historical environment parameter data set and a corresponding historical coverage distance label; the target coverage distance is determined based on the wireless parameters and the environmental parameters; and configuring the GP of the current wireless communication period according to the GP predicted value.

The application relates to the technical field of communication, and particularly discloses a data communication method based on a highway electromechanical system, which comprises the following steps: synchronously collecting strain and temperature parameters along an optical fiber, converting the strain and temperature parameters into transmission time delay variation according to predetermined physical characteristics, and generating real-time time delay dynamic data of each communication path through path integration; according to the real-time time delay dynamic data, a time delay variation file containing a trend component and a disturbance margin index is established and continuously updated for each access unit; a reference round-trip time delay of each unit is dynamically corrected according to the file in a communication station, a dynamic protection interval is determined by combining a trend change rate and a disturbance index, and an uplink time slot window with a protection band is re-distributed; through comparison between a periodically measured sample and a predicted value, a conversion relationship between an error and a physical parameter is reversely corrected to a time delay parameter based on historical credibility weighting, and adaptive optimization is realized; and the application can accurately predict and compensate time delay drift caused by dynamic deformation, and ensures reliable transmission of uplink data.

The invention discloses a 5G network ultra-far coverage method, system and device for marine economy and a medium, and belongs to the technical field of wireless communication, and the method comprises the steps: building a geometric propagation relation based on the earth curvature according to the hanging height of an antenna and the height of a terminal device, and calculating a sight distance coverage distance through a geometric figure formed by a base station antenna, a terminal and the earth center; adaptively selecting a working frequency band according to the sight distance coverage distance and the service bandwidth requirement, determining an antenna gain requirement and a beam width requirement according to the wavelength characteristic of the working frequency band, and selecting an antenna; when a time division duplex system is adopted, the cyclic prefix length and the guard interval length are configured according to the propagation time delay so as to expand the coverage distance; and when the frequency of the working frequency band is relatively high, a multi-cell joint receiving and uplink channel quality enhancement technology is configured. According to the method, the sight distance coverage range is accurately calculated by establishing the geometric propagation model based on the earth curvature, and ultra-long-distance coverage of the sea area is realized through frequency band antenna collaborative optimization and frame structure parameter configuration.

The disclosed embodiment provides a communication method, device and system, a computer readable storage medium and a program product. In the method, a first signal is transmitted on a first time domain resource, and a second signal is received on a second time domain resource. A first guard interval exists between the first time domain resource and the second time domain resource, the length of the first guard interval is a first length, both the first time domain resource and the second time domain resource are composed of a positive integer number of symbols, and the first length is the length of the positive integer number of symbols. In addition, the first time domain resource, the first guard interval, and the second time domain resource are contiguous in the time domain. Therefore, according to the embodiment of the invention, time-frequency alignment between different communication domains can be realized, so that interference is reduced.

The embodiment of the invention relates to an information identification method, an information receiving method, communication equipment and a communication system. The information identification method comprises the following steps: determining a first wireless frame; wherein the first wireless frame comprises first identification information; the first identification information identifies support information of the first device for communication parameters when UEQM transmission is adopted in a multi-space stream transmission scene; the communication parameters comprise at least one of a spatial stream number NSS, a bandwidth BW, a resource unit RU, a multi-resource unit MRU, a distributed resource unit dRU or a guard interval GI; and sending the first wireless frame to realize an interaction process of specific communication parameters in the UEQM mechanism, and if other equipment communicates with the first equipment subsequently, determining the communication parameters of the first equipment according to the first identification information, thereby realizing the UEQM mechanism and improving the regional throughput.

This invention relates to a method for access synchronization and tracking of broadband frequency-hopping systems in TDMA ad hoc networks, belonging to the field of communication technology. This invention solves the problem that existing methods cannot achieve synchronization and access of broadband frequency-hopping systems in TDMA ad hoc network scenarios. In this invention, frequency-hopping time slots are correlated with TDMA ad hoc network time slots. By completing the time synchronization and tracking correction process of the TDMA ad hoc network, the synchronization acquisition and tracking of the frequency-hopping system are simultaneously completed, making the network access process simpler and faster. Through the synchronization symbols carried within each time slot, the receiver can accurately determine the position of each symbol, complete signal demodulation, and realize information transmission. Simultaneously, the design of the front and rear guard intervals can effectively cope with the impact of different clock deviations and propagation delays during interconnection between nodes in the ad hoc network. This invention can be applied to the synchronization and access of broadband frequency-hopping systems in TDMA ad hoc network scenarios.

A message transmission method, and a communication device are provided. The message transmission method includes: receiving, by a second device, a first message sent by a first device. The first message indicates at least one of the following: a waveform of a first signal requested or suggested by the first device, a sub-carrier spacing of the first signal requested or suggested by the first device, a guard interval of the first signal requested or suggested by the first device, a bandwidth of the first signal requested or suggested by the first device, a duration of the first signal requested or suggested by the first device, a time domain interval of the first signal requested or suggested by the first device, sending signal power of the first signal requested or suggested by the first device, or a signal format of the first signal requested or suggested by the first device.

A communication method and apparatus can effectively reduce uplink transmission interference and improve uplink data transmission performance. The method comprises the following steps: a second communication device sends a first reference signal to a first communication device, wherein the first reference signal is used for updating the length of a guard interval GP of the first communication device to a first length; wherein the first length is the maximum value of the GP length corresponding to the second communication device and the GP length corresponding to the first network node, the first network node is connected with the second communication device, and the first network node has an uplink wireless signal receiving function and does not have a downlink wireless signal sending function. After the first communication device updates the length of the GP to the first length, the requirements of the second communication device and the first network node for the length of the GP of the first communication device can be met at the same time.

Described herein are systems and methods for reducing collisions in a wireless network with overlapping basic service sets by synchronizing contention slots among stations (access points or non-access point clients), some of which are out of range, competing for the use of the wireless medium. In some embodiments, the contention slots of competing stations are synchronized by controlling the time of transmission and the time of the spacing between frames to be an integer multiple of the time of a contention slot. In some embodiments, slot boundaries are enforced by controlling guard intervals or by trigger-based uplink communications. In other embodiments, a central network controller, such as a network controller, synchronizes slots when an access point or station joins the wireless network or uses a neighbor discovery protocol among access points. The contention slots are synchronous in all cases throughout the overlapping basic service sets.

The invention relates to a communication method, a communication system, equipment and a storage medium. The method comprises the following steps: receiving a sensing signal sent by second equipment in a first time domain unit; wherein a first guard interval is arranged between the first time domain unit and the second time domain unit, and the second time domain unit is a time domain resource used for communication signals. In the method disclosed by the invention, the first protection interval can be set between the first time domain unit used for transmitting the sensing signal and the second time domain unit used for transmitting the communication signal, so that the sensing signal and the communication signal can be transmitted on respective time domain resources in the sensing and communication fused communication system, the interference on the sensing signal is reduced, and the communication performance is improved. Therefore, the communication system can smoothly execute the sensing task, and the experience of the sensing service is improved.

The invention discloses a digital-analog hybrid signal modulation method capable of relieving frequency selective power fading based on discrete Fresnel transform, which comprises the following steps of: S1, collecting a plurality of wireless signals from an antenna, aggregating the wireless signals into a signal through a group of standard orthogonal bases in a chirp domain, meanwhile, the narrowband target signal is spread into a broadband signal; s2, based on the aggregated signal in the chirp domain, inserting a cyclic prefix as a guard interval into the beginning of each column in the signal, and then performing parallel-serial conversion to obtain a target output signal; s3, quantizing the output signal so as to obtain a digital part signal; s4, based on the quantized digital part signal and a target output signal, adopting subtraction operation to obtain an analog part signal; step S5, carrying out proper power regulation on the obtained digital part signal and the analog part signal; and S6, aggregating the digital signal and the analog signal after power regulation into a final modulation output signal in a time division multiplexing mode. The invention also discloses a digital-analog hybrid signal demodulation method capable of relieving frequency selective power fading based on discrete Fresnel transform, and the operation steps are the inverse process of the modulation method.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products related to waveform generation of wake-up radio (WUR) signals. One method may include receiving, from an access point (AP), a physical protocol data unit (PPDU) including a wake up radio (WUR) portion and a non-WUR portion. The WUR portion includes a WUR signal occupying a first plurality of resource units (RUs). The WUR signal includes orthogonal frequency division multiplexing (OFDM) modulated information and on-off-keying (OOK) modulated information. The non-WUR portion includes OFDM signals occupying a second plurality of resource units (RUs). The WUR signal may use a same guard interval and OFDM symbol duration as the OFDM signals. The WUR signal and OFDM signals may be orthogonal to each other in a frequency domain. The method may further include demodulating one of the OFDM modulated information and / or the OOK modulated information included in the WUR signal.

This invention relates to the field of wireless communication and automated port private network technology, specifically to a wireless communication system and method based on TDD relay and digital optical fiber, comprising: TDD relay nodes collecting uplink and downlink medium transmission status and network jitter dynamic data of the digital optical fiber link between the baseband processing unit; calculating the asymmetric delay fluctuation tolerance and cross-medium timing misalignment parameters based on these data; if the misalignment parameters are higher than a preset timing offset threshold, calculating the timing pre-compensation value and the guard interval adjustment amount based on the tolerance; if they are not higher, retaining the current guard interval and setting the above two parameters to zero; generating a TDD frame reconstruction instruction based on the above two parameters; and performing transmit and receive timing pre-adjustment and adaptive scaling of the guard interval at the node according to the instruction, outputting the compensated radio frequency transmission signal. This invention achieves high-precision observation of the real link status of digital optical fiber.

The invention discloses a communication method and device, relates to the technical field of communication, and is used for solving the problems of relatively large time delay and resource waste of conversion from downlink receiving to uplink sending. The method may comprise: a communication device determining a first symbol, the first symbol comprising a first interval and further comprising a second interval and / or a second interval; wherein the first interval is used for realizing conversion from downlink transmission to uplink transmission and serves as a reserved resource or a guard interval, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending first indication information, wherein the first indication information is used for indicating the first symbol.

The invention provides a time slot resource allocation method for a low-orbit satellite communication system based on TDD (Time Division Duplex), which adopts a flexible on-demand frame structure, schedules uplink and downlink time slots of a terminal by a satellite on demand, and ensures that no interference is generated among the time slots allocated to the terminal when the satellite schedules. According to the invention, for a random access process, an RO allocation problem considering a resource utilization rate is constructed and the optimal RO configuration is solved; for a data transmission process, time slot resource allocation optimization problems oriented to a single-satellite system and a multi-satellite system are respectively established so as to maximize a system resource utilization rate, auxiliary variables are introduced to convert non-interference constraints, and finally an optimal allocation result of time slot resources is obtained. According to the invention, uplink and downlink transmission is flexibly scheduled to avoid interference, a long guard interval does not need to be set, the utilization rate of system resources can be fully improved, and a feasible solution is provided for application of TDD in a low-orbit satellite communication system.

Communication methods and apparatuses, which can effectively reduce uplink transmission interference and improve uplink data transmission performance. A method comprises: a second communication apparatus sending a first reference signal to a first communication apparatus, the first reference signal being used for updating the length of a guard period (GP) of the first communication apparatus to a first length, wherein the first length is the larger value between a GP length corresponding to the second communication apparatus and a GP length corresponding to a first network node, the first network node is connected to the second communication apparatus, and the first network node has an uplink radio signal receiving function but does not have a downlink radio signal sending function. In this way, after updating the length of the GP to the first length, the first communication apparatus can meet the requirements of both the second communication apparatus and the first network node for the length of the GP of the first communication apparatus.

In an aspect, a first access point (AP) receives from a second AP a first frame indicating a first guard interval for a transmission from the second AP to a station (STA). The transmission is scheduled during a transmission opportunity (TXOP) of the first AP. The first AP transmits to the second AP a second frame indicating a second guard interval for the transmission. The second guard interval is based on the first guard interval. In another aspect the first AP transmits to the second AP a first frame indicating a first guard interval. The first AP receives from the second AP a second frame indicating a second guard interval.

The invention belongs to but not limited to the technical field of satellite communication, and particularly relates to an OTFS-based fractional Doppler channel estimation method and system in low-orbit satellite communication, and the method comprises the steps: S1, employing a ZC sequence as a pilot frequency, and providing a low-PAPR DD domain pilot frequency structure; s2, analyzing the influence of IDI on a ZC pilot frequency period correlation result, and revealing a module value distribution rule; s3, initial estimation based on correlation peak value calculation is provided, and initial channel parameters can be obtained; and S4, constructing a non-convex constraint least square optimization problem, and performing solution by using an SQP algorithm so as to obtain more accurate channel parameters. According to the DD domain frame structure provided by the invention, the ZC sequence is adopted as the pilot frequency, and the guard interval is set, so that the PAPR can be reduced, and the interference between data and the pilot frequency can be effectively reduced. The module value distribution rule of the correlation result of the pilot frequency period of the ZC sequence under the influence of IDI is disclosed for the first time, and the rule is fully utilized to carry out initial channel estimation, so that the accuracy and reliability of estimation are improved.

A communication method and device are used for realizing indication of a network side to a guard interval corresponding to a terminal and avoiding signal aliasing so as to improve uplink transmission efficiency. The communication method comprises the following steps: the terminal equipment receives first configuration information from network equipment; the first configuration information comprises a first guard interval configuration parameter, and the first guard interval configuration parameter is used for indicating the length of a guard interval; the terminal device determines the length of an available resource in the at least one extended time slot according to the first guard interval configuration parameter; and the terminal equipment sends the uplink data in the available resources in the at least one extended time slot.

The invention discloses a communication method and device. The method comprises the following steps: a sending end determines the length of a guard interval sequence according to a first parameter; the first parameter comprises at least one of the following items: the number of effective subcarriers of the scheduling bandwidth, an inverse fast Fourier transform (IFFT) length, a modulation and coding strategy (MCS), and a ratio of the number of occupied subcarriers to the number of effective subcarriers; a first symbol sequence is generated, the first symbol sequence comprises a guard interval sequence, and the first symbol sequence is a symbol sequence before precoding conversion; and outputting the first symbol sequence. Thus, when the sending end determines the length of the guard interval sequence, parameters of different dimensions such as the number of effective subcarriers, the IFFT length, the MCS, the ratio of the number of occupied subcarriers to the number of effective subcarriers and the like are considered, so that multipath delay interference of a single-carrier system is reduced conveniently through the guard interval sequence, and the transmission performance of the single-carrier system is improved.

The invention relates to the technical field of communication, and particularly discloses a data communication method based on a highway electromechanical system, and the method comprises the steps: synchronously collecting strain and temperature parameters along an optical fiber, converting the strain and temperature parameters into transmission time delay variations in a segmented manner according to preset physical characteristics, and generating real-time time delay dynamic data of each communication path through path integration; establishing and continuously updating a time delay change file containing a trend component and a disturbance margin index for each access unit; the communication local side dynamically corrects the reference round-trip delay of each unit according to the file, determines a dynamic protection interval in combination with a trend change rate and a disturbance index, and redistributes an uplink time slot window with a protection band; through comparison between periodic actual measurement sampling and a predicted value, adaptive optimization is realized on the basis of a conversion relation from a historical credibility weighted reverse correction physical parameter to a time delay parameter for an error; according to the invention, time delay drift caused by dynamic deformation can be accurately predicted and compensated, and synchronous and reliable transmission of uplink data is ensured.

The present disclosure relates to a communication method, a communication system, a device, and a storage medium. The method comprises: receiving, in a first time-domain unit, a sensing signal sent by a second device, wherein a first guard period is provided between the first time-domain unit and a second time-domain unit, and the second time-domain unit is a time-domain resource used for a communication signal. In the method of the present disclosure, a first guard period can be provided between a first time-domain unit used for transmitting a sensing signal and a second time-domain unit used for transmitting a communication signal, such that in a communication system integrating sensing and communication, the sensing signal and the communication signal can be transmitted on respective time-domain resources, thereby reducing interference to the sensing signal, and the communication system can smoothly execute a sensing task, thereby improving the experience of a sensing service.