758 results about "Cyclic shift" patented technology

According to embodiments, a UE receives, from a network device, a configuration of a sounding reference signals (SRS) resource with 8 antenna ports, a transmission comb configuration for the SRS resource, and a cyclic shift (CS) configuration for the SRS resource. The transmission comb configuration indicates a comb value K. K is one of 2, 4, or 8. The transmission comb configuration further indicates a configured comb offset (k). k is an integer between 0 and K−1. The CS configuration indicates CS positions. The UE maps each port of the 8 antenna ports to corresponding resource elements (REs) in the frequency domain and a corresponding CS. The corresponding REs are a subset of a plurality of REs and on every K-th RE with an offset based on the configured comb offset (k) within an SRS transmission bandwidth. The UE transmits SRSs using the 8 antenna ports based on the mapping.

Various example embodiments relate to configuration of uplink transmissions. An apparatus may transmit a first uplink transmission with a first uplink configuration and a second uplink transmission with a second uplink configuration. The first and second uplink transmissions may at least partially overlap. The first and second uplink configurations may comprise first and a second initial cyclic shifts, first and second orthogonal cover codes, first and second reference signal initializations, first and second scrambling sequence initialization, and / or first and second scrambling sequences for the first uplink transmission and the second uplink transmission, respectively.

Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives a sounding reference signal (SRS) configuration, the SRS configuration including one or more parameters defining an SRS resource, receives a cyclic shift hopping parameter for SRS transmissions, and transmits an SRS on the SRS resource, the SRS configured according to at least the cyclic shift hopping parameter.

Example embodiments of the present disclosure relate to an effective mechanism for reference signal (RS) configuration. In this solution, the terminal device determines at least one cyclic shift (CS) for an SRS transmission with four antenna ports, the at least one CS comprising: at least one first CS and at least one second CS, where the at least one second CS is different from the at least one first CS. Further, the terminal device transmits, to a network device and based on the at least one first CS and the at least one second CS, the SRS transmission over a comb-structure resource with a comb value of eight. In this way, the peak to average power ratio (PAPR) performance is improved.

A method includes performing channel encoding on a plurality of information bits to obtain a codeword that includes a plurality of code bits; segmenting the codeword into a plurality of segments of code bits; performing the following for each of the plurality of segments of code bits of the codeword: selecting, based on the segment of code bits, a set of channel resources, wherein each set of channel resources is selected among a plurality of sets of channel resources, wherein each of the sets of channel resources includes a unique combination of channel resources including one or more of a selected base sequence, a cyclic shift and a selected set of frequency domain resource elements; mapping the selected base sequence onto the selected set of frequency domain resource elements; and transmitting the selected and frequency mapped base sequence via an OFDM symbol.

The invention relates to the technical field of backscatter communication, and discloses a single-receiver WiFi backscatter method based on frequency domain cyclic shift. The method comprises the following steps: a transmitting end modulates data onto N frequency domain subcarriers, converts the N frequency domain subcarriers into N time domain samples through inverse fast Fourier transform, and forms an orthogonal frequency division multiplexing WiFi signal taking an OFDM symbol as a basic unit after adding a cyclic prefix; the label receives the WiFi signal, and performs sub-symbol-level modulation on an OFDM symbol in the WiFi signal based on a modulation technology of frequency domain cyclic shift; and the receiver determines the cyclic shift value of the frequency domain subcarrier through the frequency domain invariance of the OFDM symbol, and demodulates the received reflected signal to recover the label data. According to the invention, sub-symbol-level label data modulation is realized, the data transmission efficiency is improved, only a single symbol bandwidth is needed, and the waste of spectrum resources is avoided.

Techniques for bus sharing are disclosed. A plurality of bus requesters is coupled to a common bus. Access requests are stored in a request vector. A relative request vector (RRV) is generated by circular shifting by a rotate value to the right. The RRV is examined for the first asserted bit beginning at a first bit position proceeding in a first direction. A one-hot encoded relative grant vector is generated based on the first asserted bit. A grant vector (GV) is produced by circular shifting by a rotate value to the left. Access is granted. The rotate value is updated, affecting the priority of next grant. The GV is compared to a grant history vector (GHV). A count grant is adjusted. The count grant indicates a number of times that the bus requester indicated by the GHV was granted successive accesses to the common bus.

The present application relates to devices and components including apparatus, systems, and methods to perform a codebook-based SRS transmission. In an example, eight or more antenna ports are used for the codebook-based SRS transmission. In this example, a UE can be configured by a base station for the codebook-based SRS transmission, whereby the configuration indicates a particular comb configuration, symbol index configuration, and / or cyclic shift configuration to allow the use of the eight or more antenna ports.

Provided are a communication method and a communication device, the method being applicable to the field of communications, the method comprising: acquiring an initial cyclic shift value of an ith port in N ports corresponding to a sounding reference signal (SRS) resource and a first cyclic shift bias set corresponding to the N ports, where N is a positive integer, i is less than or equal to N, and N is a positive integer; the first cyclic shift bias set is associated with a first bitmap, and the length of the first bitmap is smaller than or equal to a maximum cyclic shift value; and sending the SRS according to the initial cyclic shift value and the first cyclic offset of the ith port in the first cyclic shift offset set. By means of the method, under the condition that a traditional UE exists in a communication system, the degree of freedom of cyclic shift jump of the target UE can be improved, and therefore the situation that the SRS sent by the target UE is interfered, and consequently the channel estimation quality is poor is avoided.

An ultra-wideband (UWB) signal transmission method includes that a plurality of initiators simultaneously sends a UWB signal. A UWB signal sent by any initiator is obtained by performing pulse shaping and modulation on a first sequence. The first sequence is obtained by performing a cyclic shift on a second sequence, and a number of cyclic shift bits is determined based on a shift factor and a step size of the cyclic shift that are of the any initiator. A responder determines time of arrival of the plurality of UWB signals based on the plurality of received UWB signals and the second sequence.

This disclosure provides methods, devices and systems for increasing the transmit power of wireless communication devices operating on power spectral density (PSD)-limited wireless channels. Some implementations more specifically relate to short training field (STF) designs and signaling that support distributed transmissions. A transmitting device that transmits data on a distributed resource unit (dRU) may transmit an STF sequence over a spreading bandwidth of the dRU according to an existing STF tone plan. Each STA allocated a dRU for transmission in a trigger-based (TB) physical layer convergence protocol (PLCP) protocol data unit (PPDU) maps its STF sequence to one or more spatial streams and may apply one or more global cyclic shift delays (CSDs) to the STF sequence mapped to the one or more spatial streams, respectively. As such, different global CSDs may be assigned to different STAs so that each STA transmits its STF sequence with different amounts of delay.

A wireless transmit receive unit (WTRU) may be configured to transmit uplink control information such as Hybrid Automatic Retransmission Request (HARQ) Acknowledgement or Negative Acknowledgement (ACK / NACK) using a sequence. The HARQ ACK / NACK may comprise one bit or two bits of information, and the WTRU may use a cyclic shift of the sequence to transmit the HARQ ACK / NACK. The WTRU may use different cyclic shifts of the sequence to transmit different HARQ ACK / NACK values and the cyclic shifts may be separated from each other in a manner to facilitate the transmissions. The WTRU may be further configured to receive, from a physical downlink control channel (PDCCH), an indication of a resource block for transmitting the HARQ ACK / NACK.

Methods, systems, and devices for wireless communications are described. A wireless communication device may implement a low-density parity-check (LDPC) code to encode and / or decode bits of a signal. The LDPC code may be defined by a base graph and a lifting scheme. The base graph may include check nodes and variable nodes. The lifting scheme may define a quantity of copies of the base graph used to generate the LDPC code and respective cyclic shifts associated with connected variable nodes and check nodes. The respective cycle shifts may be defined such that one or more cycles associated with a minimum length of the LDPC code are associated with a restriction on second degree variable nodes, nodes associated with least significant bits, or a combination thereof. Additionally, or alternatively, the respective cycle shifts may be defined such that a weighted girth of the LDPC code satisfies a threshold.

A quasi-cyclic LDPC coding and decoding method and apparatus, and an LDPC coder and decoder. The method includes: determining from a mother basis matrix set a basis matrix used for low density parity check (LDPC) coding (S202), wherein the basis matrix used for LDPC coding includes a first-type element and a second-type element, the first-type element corresponds to an all-zero square matrix, the second-type element corresponds to a matrix obtained by means of a cyclic shift of a unit matrix according to a value of the second-type element, and dimensions of the all-zero square matrix and the unit matrix are equal; and performing LDPC coding on an information sequence to be coded according to the basis matrix used for LDPC coding, and / or performing LDPC decoding on a data sequence to be decoded according to the basis matrix used for LDPC coding (S204).

Systems, methods, and instrumentalities are disclosed for synchronization signal burst, signal design, and / or system frame acquisition. A synchronization signal (SS) block or burst can be received. The SS block or burst can include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and / or a physical broadcast channel (PBCH). A first cell ID can be determined, and / or a plurality of SSS sequences can be generated. An m0 value (e.g., a first cyclic shift) can be determined from a set of m0 values, for example, based on the generated plurality of SSS sequences. An n1 value (e.g., a second cyclic shift) can be determined from a set of n1 values. A second cell ID can be determined based on, for example, the m0 value and the n1 value. A third cell ID can be determined based on, for example, the second cell ID and the first cell ID.

A wireless transmit receive unit (WTRU) may be configured to transmit uplink control information, such as a hybrid automatic repeat request (HARQ) acknowledgement or negative acknowledgement (ACK / NACK), by using a sequence. The HARQ ACK / NACK may include one or two bits of information, and the WTRU may use a cyclic shift of the sequence to transmit the HARQ ACK / NACK. The WTRU may use different cyclic shifts of the sequence to transmit different HARQ ACK / NACK values, and the cyclic shifts may be separated from each other in a manner to facilitate the transmission. The WTRU may be further configured to receive an indication of a resource block used to transmit the HARQ ACK / NACK from a physical downlink control channel (PDCCH).

A sensing-based communication method and an apparatus are provided, which are applied to a UWB-based WPAN system, for example, the 802.15.4a protocol, the 802.15.4z protocol, the 802.15.4ab protocol, or the like in 802.15 series protocols; and may be further applied to a WLAN system, a sensing system, and the like in 802.11 series protocols including a next-generation Wi-Fi protocol of 802.11ax like 802.11be, Wi-Fi 7, or EHT, and a next generation of 802.11 be like Wi-Fi 8, or UHR. A transmit end obtains control information, and sends a sensing signal based on the control information. Correspondingly, a receive end obtains the control information, and performs processing based on the control information. The control information indicates M cyclic 10 shift bit quantities corresponding to M sequences, and at least two relative cyclic shift bit quantities in relative cyclic shift bit quantities between adjacent sequences in the M sequences are different.

This disclosure provides a sounding reference signal (SRS) transmission method and apparatus. The method includes: A terminal device receives a cyclic shift offset value sent by a network device; determines a target SRS pattern from M SRS patterns based on the cyclic shift offset value, where the M SRS patterns correspond to N candidate cyclic shift offset values, each SRS pattern in the M SRS patterns includes a quantity of orthogonal frequency division multiplexing (OFDM) symbols and a quantity of SRS combs that are occupied by at least two SRS ports, the at least two SRS ports belong to a same SRS resource, N is greater than or equal to M, and M is an integer not less than 2; and sends an SRS based on the target SRS pattern.

Provided are a communication method and device, the communication method comprising: receiving a contention access resource configuration set, the contention access resource configuration set comprising Nu leading root sequence configuration sets, each leader root sequence configuration set comprises a root sequence value, a power threshold value and the number of leader sequences used for competitive access in leader sequences generated by the root sequence value; comparing the sending power with a power threshold value in each of the Nu leading root sequence configuration sets; for the leader root sequence configuration set with the included power threshold smaller than or equal to the sending power, a plurality of leader sequences with different cyclic shift versions are generated by using root sequence values in the leader root sequence configuration set, the first X leader sequences in the plurality of leader sequences are used for contention access, and the second X leader sequences are used for contention access. The rest of the leader sequences are used for non-competitive access. According to the communication method, the random access efficiency can be improved.

systems and methods include a transmitter with a control unit that is configured to generate a code, including data identifying a plurality of regions and a transmitter-specific cyclic shift scheme. The cyclic shift scheme results in a re-arrangement of the regions (using a change of time offset) that is different (transmitter-specific) for each of the transmitters. The transmitter generates a signal based on the code and transmits the signal via an antenna. The radar system includes a receiver configured to receive an echo of the signal via a second antenna that is reflected from a target and identifies the transmitter from the echo based on the transmitter-specific cyclic shift scheme.

Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol remitting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method is a method for wireless communication of a wireless device. The wireless device generates a time-domain cyclic shift code set for a transmit antenna set. Each time-domain cyclic shift code in the set corresponds to one shift in a Doppler frequency domain. The wireless device applies the time-domain cyclic shift code set to transmit signals from the transmit antenna set to simultaneously: perform Doppler division multiplexing for transmit antenna port diversity and execute beam sweeping for beam management. The wireless device transmits the signals using the transmit antenna set.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may periodically transmit one or more sidelink synchronization signals (SLSs), which may enable other UEs to synchronize communications with the UE. The UE may apply cyclic shifts to one or more symbols of the SLSSs in the time domain, which may distinguish between SLSSs transmitted by different UEs, and / or reduce destructive interference between SLSSs. In some examples, a receiving UE may apply one or more cyclic shift hypotheses to an incoming SLSS and perform one or more operations to evaluate the accuracy of each hypothesis. In some examples, a receiving UE may perform an autocorrelation operation to receive an SLSS (e.g., for detecting a cyclic shift), or otherwise evaluate the accuracy of various cyclic shift hypotheses. The UE may determine whether the SLSS is transmitted by a single UE or multiple UEs, which may improve communication reliability of the SLSS.

Some examples of the techniques described herein may facilitate transmissions using three antenna ports. For instance, some of the approaches described herein may enable uplink sounding (e.g., sounding reference signal (SRS)) transmission using three transmit antenna ports. In some examples, a four-port SRS resource may be reused for three-port SRS transmission. In some examples, a two-port SRS resource and a one-port SRS resource may be utilized for a three-port SRS transmission. Several aspects of SRS improvements may be provided to support uplink transmissions with three antenna ports. For instance, a coherent or non-coherent uplink codebook may be specified to facilitate three-antenna-port codebook-based transmissions. Some of the approaches may manage uplink transmission power or SRS resource signaling. For example, some of the techniques may provide SRS port to cyclic shift mapping or SRS power control.

The invention discloses an incoherent index modulation method and system based on a fluid antenna, and belongs to the field of wireless communication. A plurality of fluid antenna transmitting modes are preset for a fluid antenna wireless communication system, and a beam forming vector corresponding to each transmitting mode is optimized by using a closed expression of a fluid antenna space coding gain, so that a transmitter can transmit a phase shift keying modulation symbol while transmitting the phase shift keying modulation symbol; spatial bit information can be implicitly transmitted through a cyclic shift value of a fluid antenna emission mode index value, and the whole communication process does not need to depend on channel state information, so that the multiple-input-multiple-output communication method for fluid antenna energization without channel estimation is realized.

This disclosure provides methods, components, devices, and systems for ultra-high reliability (UHR) signaling design. Some aspects more specifically relate to an access point (AP) transmitting a frame including a user info field to a wireless station (STA), where the user info field supports UHR parameters. The user info field may include a subfield indicating a coding scheme for communications, where the subfield includes at least two bits to support at least three coding scheme options. Additionally, or alternatively, the AP may transmit a trigger frame indicating for one or more STAs to communicate via distributed resource units (RUs). The AP may arrange the user info fields in the trigger frame to implicitly indicate respective global cyclic shift delay (CSD) indexes to the STAs. A STA receiving the trigger frame may determine a global CSD index corresponding to the STA according to the order of the user info fields.

User equipment, especially transmitter user equipment, configured to transmit a data packet using a data signal, e.g., PSCCH and PSSCH, using one or more certain subchannels or resource blocks in one or more certain slots using sidelink communication and expecting a feedback message in a feedback signal, e.g., in a PSFCH, from a receiver user equipment of the data packet, wherein the feedback signal is receivable within PSFCH candidates, at more than one time and / or frequency and / or cyclic shift locations. User equipment, especially receiver user equipment, configured to receive a data packet using a data signal using one or more certain subchannels or resource blocks in one or more certain slots using sidelink communication and to transmit a feedback message in a feedback signal to a transmitter user equipment, wherein the feedback signal is transmittable within PSFCH candidates at more than one time and / or frequency and / or cyclic shift locations.

This disclosure provides methods, devices and systems for increasing the transmit power of wireless communication devices operating on power spectral density (PSD)-limited wireless channels. Some implementations more specifically relate to short training field (STF) designs and signaling that support distributed transmissions. A transmitting device that transmits data on a distributed resource unit (dRU) may transmit an STF sequence over a spreading bandwidth of the dRU according to an existing STF tone plan. Each STA allocated a dRU for transmission in a trigger-based (TB) physical layer convergence protocol (PLCP) protocol data unit (PPDU) maps its STF sequence to one or more spatial streams and may apply one or more global cyclic shift delays (CSDs) to the STF sequence mapped to the one or more spatial streams, respectively. As such, different global CSDs may be assigned to different STAs so that each STA transmits its STF sequence with different amounts of delay.

Provided is a multi-access method (500, 600) and a communication apparatus (102) for uplink transmission of different waveforms. The method (500) comprises receiving (502) an allocation of one or more indices for a respective users for uplink transmission of modulated symbols. The method further comprising transforming (504) the modulated symbols using a first matrix (P) for each index among the one or more indices. Furthermore, the method comprises generating (506) discrete-time signals by upsampling by a factor of plurality of indices by stuffing one or more zeroes, and circularly shifting the upsampled symbols. The method further comprises transmitting (508) uplink signals by combining the generated discrete-time signals of each user for the allocated one or more indices.

A transmitter in a wireless communication network includes a bits-to-symbol mapper that produces a plurality of data symbols; and a waveform modulator that receives a first discrete-time waveform and at least a second discrete-time waveform that comprises a cyclic shift of the first discrete-time waveform; modulates a first one of the plurality of data symbols onto the first discrete-time waveform and modulates a second one of the plurality of second data symbol onto the second discrete-time waveform, to produce a plurality of modulated discrete-time waveforms; and sums the plurality of modulated discrete-time waveforms to produce a modulated discrete-time signal to be transmitted in the network. The first discrete-time waveform and at least the second discrete-time waveform are multicarrier signals.