196 results about "Guard interval" patented technology

The invention discloses a time synchronization method suitable for a satellite communication system, and the method comprises the steps: analyzing a forward broadcast signal, and obtaining the reference time of a network clock; constructing a geometric prediction handle based on satellite orbit data, and predicting one-way propagation time delay between a terminal and a satellite by using the geometric prediction handle; estimating the processing delay of the terminal according to the symbol rate and the equipment working condition of the terminal and the delay calibration data; fusing the network clock reference time with the processing delay estimate to synthesize a terminal local time; and the sending time of the return link is calculated based on the local time and the propagation delay prediction. According to the method, the synchronization precision can be improved to a microsecond level, the convergence speed in a dynamic scene is accelerated, adaptive compression of the guard interval is supported, and the stability and spectrum efficiency of a satellite communication system are effectively improved.

Aspects presented herein may improve joint communication-radar system by providing a radar reference signal with GI-FMCW waveform. Aspects presented herein may be compatible with communication-centric waveforms and thereby may apply to UEs or network entities with minimal changes if specified. In one aspect, a wireless device transmits a set of communication signals. The wireless device configure one or more parameters associated with a set of radar reference signals for radar sensing based on the set of communication signals, each radar reference signal in the set of radar reference signals including a guard interval. The wireless device transmits the set of radar reference signals associated with the one or more parameters.

A method for wireless communication at a first network entity and related apparatus are provided. In the method, the first network entity communicates, with a second network entity, information indicative of a guard interval length. The information indicative of the guard interval length is based on transmission information. The first network entity further communicates, with the second network entity, a transmission including one or more symbols. Each symbol of the one or more symbols includes a particular guard interval based on the information indicative of the guard interval length. The method enables the GI length to be flexibly configured depending on various waveforms or channel parameters and characteristics of the transmission. The method enables transmission resources to be fully utilized according to actual operating conditions. Thus, it improves the efficiency and flexibility of wireless communication.

Methods, systems, and devices for wireless communications are described for indication of one or more symbol structures for one or multiple subsets of a set of symbols. The one or more symbol structures may include one or more guard interval (GI)-based symbol formats that are to be applied to one or more of the subsets of symbols. Different symbol formats may be indicated for different subsets of symbols, and a first subset of symbols may use a GI-based symbol format and a second subset of symbols may use a CP-based or GI-based symbol format. A base station may transmit control signaling to a user equipment to indicate one or more symbol structures for the one or more subsets of symbols, and the UE and the base station may communicate data in one or more slots in accordance with the indicated symbol structures based on the control signaling.

Disclosed are a method and device for transmitting or receiving a guard interval-based physical layer protocol data unit (PPDU) in a wireless LAN system. A method performed by a first station (STA) in a wireless LAN system, according to one embodiment of the present disclosure, comprises the steps of: receiving, from a second STA, a physical layer protocol data unit (PPDU) including first one or more fields and second one or more fields, wherein the first one or more fields include one or more non-legacy signal (SIG) fields and the second one or more fields include a data field; and decoding the first one or more fields and the second one or more fields, and obtaining a medium access control protocol data unit (MPDU) on the basis of the data field, wherein a guard interval value for the second one or more fields may be predefined as a single value.

A wireless device receives one or more configuration parameters indicating at least two sounding reference signal (SRS) resources linked for bandwidth aggregation. The at least two SRS resources comprise a first SRS resource of a first component carrier and a second SRS resource of a second component carrier without at least one uplink channel. The wireless device receives downlink control information (DCI) scheduling a transmission, where the transmission is a downlink transmission or an uplink transmission and the transmission overlaps in time with the first and second SRS resources. The wireless device drops SRS transmissions via the at least two SRS resources based on whether a time period between a last symbol of the DCI and a starting symbol of the at least two SRS resources is equal to, or greater than, a number of symbols plus a guard period.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter network node may generate a guard interval (GI)-based orthogonal time frequency space (OTFS) waveform comprising at least one defined sequence associated with at least one GI in a time domain corresponding to the GI-based OTFS waveform. The transmitter network node may transmit at least one signal based on the GI-based OTFS waveform. Numerous other aspects are described.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration that indicates, within each symbol of a plurality of symbols, an extra guard interval (GI) before data and a tail GI after the data. The UE may decode first data within a first symbol of the plurality of symbols at a first time location that is based at least in part on the extra GI and the tail GI within the first symbol. The UE may decode second data within a second symbol of the plurality of symbols at a second time location that is based at least in part on the tail GI within the second symbol. Numerous other aspects are described.

The invention provides a configuration method and a communication device. The method comprises the following steps: receiving configuration information from network equipment; the configuration information comprises first indication information and a first parameter corresponding to a symbol in the first signal, the first indication information is used for indicating a guard interval configuration mode of the first signal, the first parameter is used for indicating the number of zero data in a component signal, and the component signal is located in the symbol corresponding to the first parameter; and demodulating the first signal based on the configuration information, or generating the first signal based on the configuration information. According to the invention, the symbol average power is improved, and the signal transmission is ensured.

The present disclosure relates to the field of communications, and provides a communication sensing method and system and a related device. The method comprises: using a plurality of downlink communication symbols in a specific time slot of a communication signal to roughly measure a target wide beam where a target object is located; if the target wide beam exists, multiplexing sensing transmission symbols on the downlink communication symbols in front of a guard interval symbol in the specific time slot, to send a mixed data stream of a data stream of the communication signal and a data stream of a sensing signal obtained on the basis of mixed precoding and mixed beam forming; and during the guard interval symbol in the specific time slot, using sensing reception symbols for sensing reception, to sense a target narrow beam where the target object is located. The method provided by the present disclosure can improve the wireless resource utilization, and provide sensing capabilities under full-area coverage with minimal impact on communication network performance, providing additional sensing services at a relatively low cost.

The invention relates to the technical field of signal analysis and processing, in particular to an FSK signal blind demodulation method and system in underwater acoustic communication signal analysis and processing, and the method comprises the steps: carrying out the coarse estimation of the bandwidth and carrier frequency of an underwater acoustic FSK signal; performing symbol rate estimation and timing synchronization based on an enhanced digital phase-locked loop; down-converting the received signal to zero intermediate frequency; carrying out discrete short-time Fourier transform to obtain a time-frequency domain distribution matrix of the signal; extracting time-frequency domain distribution in a time dimension by taking a symbol period as an interval, and taking out a frequency point with the strongest power at a corresponding moment to obtain a time-frequency distribution sequence of the signal; clustering the time-frequency distribution sequence by using K-means clustering, and judging the modulation order M of the FSK signal according to the contour value; and clustering the time-frequency distribution sequences into M classes, simultaneously obtaining the class to which the frequency corresponding to each sampling point in the sequences belongs, and judging the class as an M-system symbol until the blind demodulation is finished. According to the invention, blind demodulation of FSK signals with guard intervals and without guard intervals can be realized.

The invention relates to a short-wave communication technology, in particular to a rate-adaptive short-wave OTFS communication and detection integrated transmission method, which comprises the following steps of: modulating a signal by adopting an OTFS method, introducing a guard interval setting scheme to carry out rate-adaptive transmission, and transmitting by using different adaptive schemes in different channel environments. Meanwhile, delay-Doppler domain channel detection is carried out by using a single pilot frequency communication method so as to realize channel estimation and channel equalization; according to the invention, rate adaptive adjustment can be carried out on the change of a short-wave channel environment so as to realize high transmission connectivity rate.

The invention provides a communication method and device, which are used for realizing flexible configuration of guard intervals between symbols. The method comprises the following steps: obtaining K data symbols, wherein K is a positive integer; the first communication device adds the first sequence, the second sequence and the third sequence to the P data symbols according to the first configuration information to obtain a first set, or adds the first sequence and the second sequence to the P data symbols to obtain the first set, or adds the second sequence and the third sequence to the P data symbols to obtain the first set, p is less than or equal to K; the first set is modulated to obtain a first waveform symbol. Wherein the first configuration information is determined according to a first SCP length contained in the first waveform symbol and a cyclic prefix (CP) length of the first waveform symbol, so that a sequence contained in the first set is related to the first SCP length and the CP length in the first waveform symbol; the flexibility of guard intervals between first waveform symbols generated according to a first set and other symbols can be improved.

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.

Provided are: a method for operating an integrated access and backhaul (IAB) node including a mobile terminal (MT) and a distributed unit (DU) in a wireless communication system; and a node using the method. Provided are: a method for operating another node communicating with the IAB node; and the other node using the method. The IAB node identifies a first resource allocated for the operation of the MT and a second resource allocated for the operation of the DU, the first resource and the second resource being resources in which overlap occurs in a time domain, determines a guard period in the first resource or the second resource, and performs either the operation of the MT or the operation of the DU in the guard period.

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.

This invention provides an OTFS peak-to-average power ratio (PAPR) suppression method, apparatus, electronic device, and readable storage medium for high-reliability transmission, applied in the field of wireless communication technology. The method includes: embedding a pilot signal into an OTFS delay-Doppler domain signal frame and setting a guard interval to obtain an initial delay-Doppler domain transmitted signal; performing amplitude-limiting filtering on the transmitted signal to obtain amplitude-limited filtered noise; obtaining approximately iteratively ...

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.

The present application discloses an information mapping method, comprising: a transmitting device maps first information to second information on a delayed Doppler frame; wherein the delayed Doppler frame includes M*N grids; M is the total number of delay indexes, N is the total number of Doppler indexes, and M and N are both positive integers; the delayed Doppler frame includes at least two subframes, each subframe includes a first guard interval part, a first mapping part and two second mapping parts; the two second mapping parts respectively occupy the k-th part of the head and the tail of the subframe in the Doppler direction max Doppler index corresponding to the grid, the first mapping part occupies the subframe N / G-2k max Doppler index corresponding to the grid; G is the number of subframes contained in the delayed Doppler frame, k max is a positive integer; the information mapped by the second mapping parts at the head of different subframes is the same, and the information mapped by the second mapping parts at the tail of different subframes is the same.

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.

A wireless communication device (10; 20; 800; 900) generates a first data transmission and a second data transmission on a wireless channel based on Orthogonal Frequency Division Multiplexing, OFDM. The first data transmission and the second data transmission are separated by a time gap corresponding to an integer multiple of OFDM symbol duration plus guard interval and allowing to preempt the second data transmission by starting a further transmission on the wireless channel during the time gap.

The invention belongs to the technical field of navigation receivers, and relates to a CP-OFDM signal navigation receiving method and a navigation receiver. The method comprises the following steps: performing down-conversion on a received CP-OFDM signal to obtain an intermediate frequency signal; sending the intermediate frequency signal into an incoherent delay tracking loop, wherein the incoherent delay tracking loop comprises a leading branch, an instant branch and a lagging branch; the leading branch and the lagging branch process the intermediate frequency signal to obtain coherent integral amplitudes respectively; when the two branches process the intermediate frequency signal, local copy signals are generated firstly, and the protection interval of the local copy signals is filled to be zero; calculating according to the amplitude of the coherent integration of the two branches to obtain signal propagation time delay; eliminating noise to obtain a filtered time delay value; and estimating the time delay experienced by the received signal based on the filtered time delay value, and estimating the position information of the receiver. The problem that the cyclic prefix and the adjacent frequency points in the CP-OFDM signal influence the navigation tracking precision is solved.

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a transmitting device may add a first extension before a modulation symbol of a communication, the first extension including data from an end portion of the modulation symbol. The transmitting device may add a second extension after the modulation symbol, the second extension including data from a starting portion of the modulation symbol. The transmitting device may apply a first weighting function that overlaps the first extension and the starting portion of the modulation symbol. The transmitting device may apply a second weighting function that overlaps the end portion of the modulation symbol and the second extension. The transmitting device may add one or more of a header before the first extension or a tail after the second extension. The transmitting device may transmit the communication. Numerous other aspects are described.

Disclosed are a Wi-Fi7-based target wake-up time service period scheduling method and system, relating to the technical field of information, comprising: an access point receiving a buffer status report of each terminal, the buffer status report of each terminal comprising a data volume to be transmitted, a data priority and link status information; with minimization of the total energy consumption of the system as a target, a constraint condition is preset based on a to-be-transmitted data volume, and a transmission link combination and a service period duration are allocated to each terminal by using a genetic algorithm; and distributing a service period time window for each terminal according to the data priority, reserving a protection interval in adjacent service periods, and notifying the terminal to output a scheduling result through a trigger frame or a beacon frame.

The invention provides an LDPC code bit interleaving method and system for relieving pilot interference, and the method comprises the steps: carrying out the LDPC coding of a bit sequence to be transmitted, and dividing the coded bit sequence into a plurality of sub-blocks; sorting the protection capability of each sub-block; calculating a residual pilot interference power expected value of each data symbol, and dividing bits after symbol de-mapping into different interference levels; and bit interleaving is completed according to the sequence of the protection capabilities of the sub-blocks and the classification result of the interference levels of the bits, and a receiving end recovers the interleaved bit sequence to the sequence of just coding through a de-interleaver before decoding and sends the bit sequence to a decoder for decoding. According to the invention, a bit interleaving technology is designed, different protections are provided for coding bits, the bits which are seriously influenced by pilot interference are fully protected, and the pilot interference is relieved while a guard interval is not needed.

The embodiment of the invention provides a data processing method and device, equipment, a medium and a product. The data processing method comprises the steps that area information of effective network coverage areas of any two satellite base stations in a plurality of satellite base stations is acquired; for any two satellite base stations in the plurality of satellite base stations, when the terminal device is determined to be located in the effective network coverage area of any two satellite base stations in the plurality of satellite base stations based on the area information of the effective network coverage area of any two satellite base stations in the plurality of satellite base stations and the terminal position of the terminal device, the terminal device is located in the effective network coverage area of any two satellite base stations in the plurality of satellite base stations. Acquiring air interface transmission delay of data transmission between the terminal equipment and a target satellite base station, wherein the target satellite base station comprises at least one of any two satellite base stations; and determining a guard interval for adjusting the time slot according to the air interface transmission delay for data transmission between the terminal device and the target satellite base station. According to the embodiment of the invention, cross time slot interference can be effectively avoided.

The invention provides an authorization-free scale random access method and system, and belongs to the technical field of narrowband Internet of Things communication. Comprising the following steps: randomly selecting a preamble sequence by a sensor end, adding a guard interval cyclic prefix, a time timing amount and a time slot pointer into the preamble sequence to form a preamble, and combining with an access request data packet to form a data frame; the sensor end copies a data frame for N1 copies and randomly selects a plurality of time slots to send the data frame to the gateway end in an orthogonal frequency division multiplexing form; the gateway end receives and stores the data frame received by each time slot; traversing all the time slots, and if the time slots do not collide, extracting corresponding sending data frames in the data receiving window for decoding; for the successfully decoded data frame, the gateway end eliminates other time slot data interference according to the time timing amount of the time slot pointer; the gateway end sends an information packet on a corresponding physical downlink shared channel resource for the sensor end which is successfully accessed; and the sensor end receives the information packet returned by the gateway end, and performs subsequent data transmission by using the timing advance information.

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.