806results about "Code division multiplex" patented technology

According to some embodiments, a method performed by a wireless device comprises obtaining an indication that a demodulation reference signal (DMRS) is based on frequency domain coding using a frequency domain orthogonal cover code (FD-OCC) of length greater than two and transmitting or receiving a number of DMRS based on the frequency domain coding.

A first communication node (12) in a wireless communication network (10) monitors for a cell-specific wake-up signal (20). The first communication node (12) may monitor for the cell-specific wake-up signal (20) with a wake-up receiver (12W). The first communication node (12) in particular may monitor for a cell-specific wake-up signal (20) that is any of multiple cell-specific wake-up signals (20) in a set. In some embodiments, the set is re-used for different sets of cells. Alternatively or additionally, the set may include cell-specific wake-up signals (20) that are based on multiple respective binary sequences, based on different codewords of a binary error correcting code, based on different orthogonal sequences in a set, composed of different sets of Zadoff-Chu sequences with different roots, composed of the same set of Zadoff-Chu sequences with different cyclic shifts, or a function of different cyclic shifts of a root wake-up signal formed by multiple Zadoff-Chu sequences with different roots.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to wireless communication and, more specifically, to a method of sounding reference signal transmission. The technical result consists in reducing the processing complexity for SRS generation and transmission at the base station, increasing the interference immunity of SRS transmission, and enabling dynamic switching between different SRS sequence configurations. A method of sounding reference signal (SRS) transmission from the user equipment (UE) to the base station (BS) comprises: configuring, at the base station, transmission comb-specific SRS sequences; indicating SRS transmission from the user equipment in accordance with said configuration; generating, in the user equipment, an SRS using at least one said transmission comb-specific SRS sequence, and transmitting the SRS from the user equipment to the base station.

An internet of things (IoT) non-terrestrial network (NTN) device user equipment (UE) is described. The UE includes receiving circuitry configured to receive narrowband physical random access channel (NPRACH) configurations including NPRACH resource configuration, repetition parameters, orthogonal cover code (OCC) multiplexing methods and OCC multiplexing factors. The UE also includes transmitting circuitry configured to select an NPRACH resource and randomly select an OCC index for an OCC multiplexing. The transmitting circuitry is further configured to transmit NPRACH preambles with a configured OCC multiplexing method and a multiplexing factor.

A communication method by a user equipment (UE) is described. The method includes receiving, from a base station, system information including a first radio resource control (RRC) parameter, wherein the first RRC parameter provides a cell-specific physical uplink control channel (PUCCH) resource set and the cell-specific PUCCH resource set includes one or more PUCCH resources; and receiving a PDCCH with a DCI format scheduling a PDSCH; and transmitting, on a PUCCH resource included in the cell-specific PUCCH resource set, a PUCCH with HARQ-ACK information in response to the PDSCH received, wherein whether or not to transmit the PUCCH using frequency hopping is determined based on one, more or all of a first DCI field of the DCI format, RRC parameter(s) and a predefined rule.

A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration indicating more than four sounding reference signal (SRS) ports and a configuration of a comb index, and a control section that applies different values to the comb index of some SRS ports and the comb index of other SRS ports out of the more than four SRS ports, based on the configuration of the comb index. According to one aspect of the present disclosure, transmission of an SRS using more than four SRS ports can be appropriately performed.

The invention belongs to the field of wireless communication, and particularly relates to wireless communication of aerospace crafts, in particular to a differential coding modulation communication method suitable for large Doppler frequency shift. The method comprises the following steps: 1, setting frame structure parameters; 2, framing is carried out according to power control, a synchronization header, a header and a data segment, and a frame structure is generated; step 3, quantizing and de-spreading the received signal to generate a to-be-synchronized data stream; 4, determining a frame synchronization position and a bit synchronization position, calculating frequency offset by using FFT (Fast Fourier Transform), and calculating channel frequency offset to carry out frequency offset compensation; 5, calculating a correlation value after compensating the data stream, and determining a coarse synchronization position of a receiving end frame; and 6, carrying out five-path parallel correlation peak calculation to obtain a data block bit synchronization position, a position ahead of two sampling points, a position lagging of two sampling points, a position lagging of one sampling point and a position ahead of one sampling point.

The embodiment of the invention discloses equipment, a method and a device for beam reporting. A first terminal device receives a plurality of sidelink (SL) positioning reference signal (PRS) configurations from a plurality of terminal devices. The first terminal device determines, based on the plurality of SL PRS configurations, whether the plurality of terminal devices select overlapping resources for the plurality of SL PRS transmissions. Based on determining that the plurality of terminal devices have selected overlapping resources for the plurality of SL PRS transmissions, the first terminal device sends, to a second terminal device among the plurality of terminal devices, a request to update the SL PRS transmissions by the second terminal device.

The invention relates to the technical field of signal analysis, and discloses a signal feature analysis method for an LTE-OFDM unmanned aerial vehicle, and the method comprises the steps: obtaining a to-be-detected sampling sequence of an OFDM signal of the LTE-OFDM unmanned aerial vehicle, the OFDM signal having the features of a ZC sequence; searching the initial position of the CP sequence in the to-be-detected sampling sequence; determining a symbol sequence from the to-be-detected sampling sequence according to the initial position of the CP sequence; performing Fourier transform on the symbol sequence to obtain the number of effective subcarriers of the symbol sequence; determining a length range and a root value range of the ZC sequence according to the number of the effective subcarriers; determining a plurality of ZC search sequences according to each length in the length range and each root value in the root value range; and determining the length and the root value corresponding to the ZC search sequence with the maximum correlation value with the to-be-detected sampling sequence in the length range of the sub-sequence in the plurality of ZC search sequences as the characteristic value of the OFDM signal. In this way, the detection performance of the target of the unmanned aerial vehicle which hovers or flies at a low speed is improved.

The invention discloses a multi-carrier multi-system differential chaos shift keying modulation and demodulation method and system based on improved code index modulation, and relates to the technical field of communication signal processing. The method comprises the following steps: at a sending end, converting information to be transmitted into N groups of parallel information, dividing each group into index bits and modulation bits, converting each group of index bits into decimal numbers, and modulating the modulation bits; acquiring a reference signal; the reference signal and the information signal are multiplied by a carrier and transmitted into a channel. At a receiving end, the reference signal and the information signal are recovered through multi-carrier demodulation; the method comprises the following steps: multiplying an information signal by a Walsh code, performing related demodulation on a sequence of a reference signal and the information signal, obtaining a sequence number with maximum energy in the information signal, recovering a code index value, converting the code index value into a binary number, recovering an index bit, obtaining a related demodulation result, demodulating and recovering a modulation bit, and outputting original information after conversion. According to the invention, the problems of high bit error rate, poor bit error rate performance and low data rate of the existing MC-DCSK modulation and demodulation method can be solved.

A terminal device and a method for measuring cross-link interference. The method includes receiving time-frequency resource configuration information from a base station, wherein the time-frequency resource configuration information includes configuration information of measurement time-frequency resources for measuring the cross-link interference. The method also includes determining measurement time-frequency resources for measuring the cross-link interference according to the time-frequency resource configuration information. The method further includes measuring the cross-link interference on the measured time-frequency resources and feeding back the measurement result of the cross-link interference to the base station.

The embodiments of the present disclosure provides a downlink control channel detection method, a terminal and a network side device. The method includes: performing energy-saving signal detection by a terminal, wherein the energy-saving signal is at least used to indicate detection information of a downlink control channel; detecting the downlink control channel by the terminal according to the detection information if the energy-saving signal is detected.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system includes receiving, from a base station, configuration information on an orthogonal cover code (OCC), identifying a transport block (TB) and multiple slots for a TB processing, based on the configuration information, applying a different OCC sequence to each repetition of the TB, and transmitting, to the base station, a physical uplink shared channel (PUSCH).

This application discloses a resource configuration method, a resource determining method and apparatus, a communication device, and a storage medium, and belongs to the field of communication technologies. The resource configuration method in embodiments of this application includes: configuring, by a signal sending node, a first resource based on a predetermined first array, where the first array includes at least one Costas array or at least one Costas array set, and each Costas array set includes at least one Costas array; and sending, by the signal sending node, a first signal by using the first resource.

The invention relates to the transmission and reception of non-binary error correcting code words. The transmission method includes a first modulation (56) which implements a set of q sequences comprising q−1 sequences of q−1 chips, each sequence being obtained by circular shifting of a basic pseudo-random sequence, and a partially invariant sequence, invariant to a predetermined subset of circular shifts. The first modulation (56) further implements an association between each code word symbol and a sequence of the set of sequences wherein said finite field GFq has a non-zero primitive element, the symbol zero being associated with said partially invariant sequence and a symbol equal to a power j of the primitive element, j being an integer comprised between 0 and q−2, being associated with a pseudo-random sequence determined by j circular shifts of the basic pseudo-random sequence.

A wireless transmit / receive unit (WTRU) may be configured to receive a primary synchronization signal (PSS) scrambled with a first sequence and to determine a PSS sequence index (uk) associated with the PSS and a first sequence index (wi) associated with the first sequence. The WTRU may be configured to determine a first parameter set based on the PSS sequence index (uk) and the first sequence index (wi) and to send information using at least one parameter from the determined first parameter set. The first parameter set may be associated with a waveform. The first parameter set may comprise at least one of: an indication of a waveform type and an indication of a multiplexing scheme. The information may be a physical random access channel (PRACH) transmission. The WTRU may be configured to determine a first offset based on the PSS sequence index (uk) and the first sequence index (wi).

A user equipment (UE) that includes one or more non-transitory computer-readable media storing one or more computer-executable instructions for determining the transport block size for a Physical Uplink Shared Channel (PUSCH) transmission and at least one processor coupled to the one or more non-transitory computer-readable media is provided. The processor is configured to execute the one or more computer-executable instructions to cause the UE to determine whether an Orthogonal Cover Code (OCC) is applied to the PUSCH transmission; determine a spreading factor of the OCC in a case that the OCC is applied to the PUSCH transmission; and determine the transport block size using a scaling factor in a case that the OCC is applied to the PUSCH transmission, the scaling factor being determined based on the spreading factor.

This disclosure provides systems, methods, and apparatus, including computer programs encoded on a computer storage medium, for interference reduction techniques between passive wireless devices. In some aspects, a source device, a reader device, or a passive wireless device may support one or more interference avoidance mechanisms, according to which the reader device may experience less interference from other devices within the system, such that the reader device may experience less interference from the other devices within the system. Messages for the reader device may be decoded more accurately based on radio frequency signaling received at an antenna of the reader device, or both. In some implementations, a plurality of passive wireless devices may each add or apply a respective communication signature to a reflected or backscattered signal from the passive wireless device. The respective communication signature may uniquely identify backscatter signaling from a particular passive wireless device such that the reader device may parse the received signaling and extract and decode related messages.

The invention discloses an unmanned aerial vehicle image transmission signal frequency and bandwidth estimation method and device, and the method comprises the steps: carrying out the segmentation interception of a received signal, and obtaining a signal segmentation sequence; performing preliminary screening on the signal segments by using the frequency spectrum conjugate symmetry of the ZC sequence; carrying out delay correlation processing on the primarily screened signal segments to obtain a delay correlation result sequence, taking an index value corresponding to the maximum modulus value of the delay correlation result sequence as an initial index, and obtaining a signal segment containing a ZC sequence; zC sequences under different bandwidths stored locally are obtained, conjugate multiplication is carried out on the ZC sequences and signal fragments containing the ZC sequences, whether the signals are image transmission signals of the unmanned aerial vehicle or not is determined according to frequency spectrum module value peaks of conjugate multiplication results, and meanwhile the center frequency and the bandwidth of the image transmission signals are obtained. According to the invention, the signals are intercepted in a segmented manner, and the peak-to-average ratio is used for rapid preliminary screening, so that the real-time performance is significantly improved; robustness and accuracy are greatly enhanced through a double-confirmation mechanism, calculation is efficient, and the method has good application prospects.

The invention provides a communication method and a related device, which can reduce the number of bit storage units required for carrying out related detection on a lead code, a lead code or a middle lead code. The method comprises the steps that a first device determines a first signal according to a first sequence and sends the first signal, the first sequence and a first generalized Golay sequence meet a preset relation, n stages of registers are used for generating the first generalized Golay sequence, the storage depth of the kth stage of register in the n stages of registers is # imgabs0 # Pk is an integer from 0 to n-1, the value of Pn is n-1, and when i is not equal to j and Pi is not equal to Pj, the first device sends the first signal, the values of i and j are integers from 0 to n-1, the value of k is any integer from 1 to n, n is a positive integer, the length of the first sequence is N, and N is equal to 2n; and the first device receives the first signal and detects the first signal by using the first-stage to (n-1) th-stage registers in the n-stage registers to determine the initial position and / or the end position of the first sequence in the first signal.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present invention relates to a method and an apparatus for estimating an uplink channel of a base station in a wireless communication system, comprising the steps of: estimating a position of a wireless channel tap on the basis of a sounding reference signal (SRS) received from a terminal; determining an average power value of the wireless channel tap for each link between a transmitting antenna and a receiving antenna from and to which the SRS is transmitted; and estimating an effective channel frequency response (effective CFR) of a physical uplink shared channel (PUSCH) on the basis of the position of the wireless channel tap and the average power value of the wireless channel tap.

The embodiment of the invention provides a communication method and device, relates to the field of communication, and can enable more users to perform uplink communication. The communication method comprises the following steps: generating a first signal, and sending the first signal. Wherein the first signal is determined according to a first base sequence, the first base sequence is one base sequence in a first base sequence group in N base sequence groups, and the first base sequence group comprises K base sequences; wherein under the condition that N is an integer greater than 30, K is a positive integer; under the condition that N is equal to 30, K is an integer greater than 2.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for interference reduction techniques between passive wireless devices. In some aspects, a source device, a reader device, or a passive wireless device may support one or more interference avoidance mechanisms according to which the reader device may experience less interference from other devices within a system or may more accurately decode messaging that is meant for the reader device from the radio frequency signaling received at an antenna of the reader device, or both. In some implementations, multiple passive wireless devices may each add or apply a respective communications signature to a reflected or backscattered signal from that passive wireless device. The respective communications signatures may uniquely identify backscattered signaling from a specific passive wireless device such that a reader device may parse through received signaling and extract and decode a relevant message.

Some aspects of the present disclosure provide methods and devices that enable a framework for selection or configuration, or both, of a waveform for use in integrated sensing and communications (ISAC). Use of the framework provides a new waveform, based in part on various criteria, which provides a trade-off among different ISAC requirements. Therefore, when different criteria are important for a particular implementation, a waveform that best meets the requirement of those criteria may be used. The various criteria may include factors such as hardware constraints at the UE, radio frequency (RF) chirp generation or detections capability at the UE, spectral emission or leakage such as OOBE, sensing performance, and sensing complexity. In some embodiments, a cyclic prefix (CP) is provided to use the chirp-based sensing waveforms as a demodulated reference signal (DMRS). In some embodiments, the CP enables alignment with a communication signal frame.

Various aspects of the present disclosure relate to transmitting a first random access configuration comprising code domain information and receiving a first set of random access transmissions from a set of internet-of-things (IoT) devices, each random access transmission of the first set of random access transmissions multiplexed according to the code domain information. Aspects of the present disclosure may relate to transmitting a second random access configuration to a subset of IoT devices of the set of IoT devices based at least in part on a collision between a subset of random access transmissions of the first set of random access transmissions, where the subset of random access transmissions is associated with the subset of IoT devices, and receiving a second set of random access transmissions based on the second random access configuration.

A sequence transmission method and an apparatus are provided, which may be applied to a downlink synchronization scenario, a random access scenario, a sensing scenario, a radar scenario, an integrated sensing and communication scenario, or the like, to increase sequence design diversity, and improve sequence design flexibility and target detection accuracy. The method includes: A transmit end apparatus determines N first sequences, and sends the N first sequences. An nth first sequence in the N first sequences is determined based on an nth second sequence in N second sequences, formula (I), am is a prime number, M is a positive integer greater than 1, and n=0,1, . . . , N−1. Each second sequence is a sequence in a Golay complementary pair GCP. The N second sequences include formula (II) first sub-sequence sets, each first sub-sequence set includes am second sub-sequence sets, each second sub-sequence set includes formula (III) second sequences, m=0,1, . . . , M−1, and a−1=1.

The invention discloses a pilot frequency transmission method and device. The method comprises the following steps: determining a first length; determining a first sequence pair according to the first length; wherein the first sequence pair comprises at least two sequences, and the length of each sequence in the at least two sequences is a first length; generating at least two pilot symbols based on the first sequence pair; and outputting the at least two pilot symbols. According to the scheme, when the pilot symbol is generated, the length of the sequence used for generating the pilot symbol is considered, the pilot symbol can be generated based on the sequence with the proper length (namely the first length), and the technical effect of considering the overhead and effectiveness of channel estimation is achieved.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless device may transmit an orthogonal frequency division multiplexing (OFDM) signal on K subsets of N subcarriers, where the signal includes a sequence of modulated symbols for each subset of the K subsets that is distinct for each subset. The wireless device may receive a reflected OFDM signal that corresponds to the OFDM signal. The wireless device may process the reflected OFD.M signal with K mixers, where mixer frequencies for the K mixers are separated by N subcarriers spacing, to form K portions of a range spectrum from the reflected OFDM signal. The wireless device may combine the K portions to form the range spectrum. Numerous other aspects are described.

Aspects relate to enhancing communication between network entities and ambient IoT devices using a cyclic prefix (CP) transparent on-off keying (OOK) waveform. An ambient IoT device may be configured to receive an OOK orthogonal frequency-division multiplexing (OFDM) waveform that includes a CP. The ambient IoT device may be configured to sample symbols of the received OOK OFDM waveform at a pre-defined sampling rate. The pre-defined sampling rate may be based upon a pre-defined duration of the symbols of the received OOK OFDM waveform. In particular, the pre-defined duration of each of the symbols of the received OOK OFDM waveform may be defined such that a last OOK OFDM symbol duration is set to be the same as a first OOK OFDM symbol duration, in which, the first OOK OFDM symbol includes the CP.