19 results about "Binary phase shift keying bpsk" patented technology

The invention discloses an active pen and touch screen interaction system resistant to common-mode interference and a signal demodulation method. The system comprises a signal receiving terminal and a signal transmitting terminal. The signal transmitting terminal modulates data to be transmitted by adopting a differential binary phase shift keying modulation method, and transmits a generated modulation signal to the signal receiving terminal; the analog front-end receiving module is coupled with the signal transmitting terminal, receives the modulation signal and outputs a digital square wave signal after fidelity extraction processing; and the digital demodulation processing module performs differential coherent digital demodulation on the digital square wave signal based on the prior characteristics of the modulation signal, inhibits residual noise and recovers data to be sent. The analog front end focuses strong common-mode noise suppression and analog filtering, the digital demodulation algorithm performs secondary digital purification by using signal time sequence characteristics, and the two constructs an efficient anti-interference pipeline. Meanwhile, the regular square wave signals can be directly processed through differential coherent demodulation, and the requirements for performance and power consumption of a rear-end processor are lowered.

Methods and apparatus, including computer program products, are provided for pi / 2 BPSK initial access. In some example embodiments, a method can be provided that includes receiving, at a user equipment, information indicating network support for initial network access based on a pi / 2 binary phase shift keying (pi / 2-BPSK) modulation and coding scheme; and in response to the received system information, performing initial network access by at least sending a connection request based on the pi / 2-BPSK modulation and coding scheme. Related systems, methods, and articles of manufacture are also described.

A method and an apparatus for transmitting a physical layer protocol data unit (PPDU) are provided. The method includes: generating a synchronization header field based on a first sequence or a third sequence, where a side lobe of a periodic cross-correlation function of the first sequence and a second sequence is a constant value, the first sequence is a binary sequence consisting of 1 and 0, the second sequence is a binary phase shift keying sequence corresponding to the first sequence, a side lobe of a periodic autocorrelation function of the third sequence is a constant value, and the third sequence is a binary phase shift keying sequence consisting of 1 and −1; and sending the PPDU on a target channel, where the PPDU includes the synchronization header field.

The present disclosure relates to signal processing methods and apparatus. One example method includes determining a first sequence {x(n)} based on a preset condition and a sequence {s(n)}, generating a reference signal of a first signal by using the first sequence, and sending the reference signal on a first frequency-domain resource. The preset condition is xn=y(n+M)modK, whereyn=A·ej×π×sn8,M∈{0, 1, 2, . . . , 5}, a length of the first sequence is K=6, n=0, 1, . . . , K−1, A is a non-zero complex number, and j=√{square root over (−1)}. The first signal is a signal modulated by using π / 2 binary phase shift keying (BPSK). The first frequency-domain resource comprises K subcarriers each having a subcarrier number of k, k=u+L*n+delta, L is an integer greater than or equal to 2, delta∈{0, 1, . . . , L−1}, u is an integer, and subcarrier numbers of the K subcarriers are numbered in ascending or descending order of frequencies.

Methods, systems, and devices for wireless communications are described. The described techniques provide for a user equipment (UE) to communicate using π / 2 binary phase shift keying (BPSK) modulation according to extended coding rates. In some cases, the UE may receive configuration information that supports modulation orders for π / 2 BPSK modulation extended to include modulation orders otherwise only configured for quadrature phase shift keying (QPSK) modulation. Further, the UE may support dynamic switching between π / 2 BPSK and QPSK modulation. For example, the UE may transmit or receive control signaling indicating a modulation order for an uplink transmission, where the UE or a network entity may determine which modulation scheme and order to use according to communication parameters associated with the uplink transmission, the UE, or both.

Methods, systems, and devices for wireless communications are described. The described techniques provide for a user equipment (UE) to communicate usingπ2binary phase shift keying (BPSK) modulation according to extended coding rates. In some cases, the UE may receive configuration information that supports modulation orders forπ2 ⁢BPSKmodulation extended to include modulation orders otherwise only configured for quadrature phase shift keying (QPSK) modulation. Further, the UE may support dynamic switching betweenπ2 ⁢BPSKand QPSK modulation. For example, the UE may transmit or receive control signaling indicating a modulation order for an uplink transmission, where the UE or a network entity may determine which modulation scheme and order to use according to communication parameters associated with the uplink transmission, the UE, or both.

Examples of a 2´2 optical hybrid receiver for entanglement-assisted communication are disclosed indicating that the examples of the receiver have roughly 10% lower error probability compared to previously proposed optical parametric amplifier-based receivers for more than 10 modes. Numerical findings indicated that surpassing the Holevo and Homodyne capacities does not require a large number of signal-idler modes. In addition, findings indicated that using unequal priors for Binary Phase-Shift Keying (BPSK) provides roughly three times the information rate advantage over.

Examples of a 2´2 optical hybrid receiver for entanglement-assisted communication are disclosed indicating that the examples of the receiver have roughly 10% lower error probability compared to previously proposed optical parametric amplifier-based receivers for more than 10 modes. Numerical findings indicated that surpassing the Holevo and Homodyne capacities does not require a large number of signal-idler modes. In addition, findings indicated that using unequal priors for Binary Phase-Shift Keying (BPSK) provides roughly three times the information rate advantage over.

Various aspects of the present disclosure relate to MCS determination for PUSCH transmission. In an aspect, a UE determines a first modulation and coding scheme (MCS) index table based on a physical uplink shared channel (PUSCH) type of a PUSCH transmission. A number of entries supporting π / 2 binary phase shift keying (BPSK) modulation in the first MCS index table is larger than a number of entries supporting π / 2 BPSK modulation in a second MCS index table. The first MCS index table and the second MCS index table are applied for a same PUSCH type. The UE transmits, to a network entity, the PUSCH transmission using a modulation order and a target code rate. The modulation order and the target code rate are determined based on the first MCS index table and an indication indicative of an MCS index for the PUSCH transmission.

The application discloses a digital air computing method based on binary complement coding, comprising the following steps: linear scaling and down rounding quantization are performed on a continuous analog signal to be calculated at a distributed device end, and the quantized value is converted into a binary complement sequence with a fixed length; a decoder is designed at a base station end based on a superposition result of each binary bit; each bit of the binary complement sequence is subjected to binary phase shift keying (BPSK) modulation, a frequency band is divided into a plurality of subcarriers by using orthogonal frequency division multiplexing (OFDM) technology, and a plurality of devices superimpose transmission on the same subcarrier for the same binary bit; equal power allocation is performed according to the weight priority of the binary bit, a transmission signal is preprocessed based on channel state information by using a truncated channel inversion strategy; a linear minimum mean square error (LMMSE) detector is applied to each subcarrier received signal at the base station end to estimate a superposition result; a multi-subcarrier mean square error minimization problem is constructed, and a greedy algorithm is used to optimize an active device set and a transmission power factor; and the application significantly improves the real-time performance and reliability of multi-device cooperative computing in actual application.

According to an embodiment, a method performed by a distributed unit (DU) may comprise generating, based on a modulation compression scheme, a modulation value corresponding to information bits. The method may comprise generating, based on a shifting operation corresponding to the modulation compression scheme, user plane (U-plane) data corresponding to the modulation value. The method may comprise transmitting, to a radio unit (RU) through a fronthaul interface, a U-plane message comprising the generated U-plane data. In a case of binary phase shift keying (BPSK), the modulation compression scheme may be set to perform the shifting operation based on a designated first equation. In a case of non-BPSK, the modulation compression scheme may be set to perform the shifting operation based on a designated second equation.

The invention discloses a binary phase shift keying signal detection method and system based on a Gaussian kernel function, which can effectively suppress the influence of pulse interference on a judgment detector by introducing the Gaussian kernel function and utilizing the suppression effect of the kernel function on large-amplitude data, has excellent non-Gaussian noise resistance robustness, and can effectively improve the detection accuracy of the binary phase shift keying signal. The bit error rate performance superior to that of a traditional method can be provided, and possibility is provided for reliable data transmission in a noise-dominated communication environment. A systolic array architecture is designed, a complex judgment algorithm is decomposed into modularized and pipelined hardware units, a parallel operation mode is adopted, the defects that a traditional robust algorithm is large in calculation amount and difficult to achieve in real time can be overcome, the time complexity of double summation operation is reduced from O () to O (), and the calculation efficiency is improved. And the strict requirement of a high-data-rate communication system on real-time processing is met.

The invention discloses a method and a system for quickly capturing a low-orbit high-dynamic signal, which relate to satellite communication and signal processing technologies, and comprise a time-sharing parallel correlation step: receiving an intermediate frequency signal, searching a code phase by performing correlation operation on a local pseudo code and the intermediate frequency signal, and after each correlation operation, performing time-sharing parallel correlation on the local pseudo code and the intermediate frequency signal; enabling the local binary phase shift keying (BPSK) modulation pseudo code to slide on a code phase by a stepping amount corresponding to the number of parallel correlators so as to finish coarse capture of the code phase; a frequency secondary search step: applying a plurality of different Doppler frequency compensation values to the intermediate frequency signal in sequence according to the code phase coarsely captured by the code phase, and repeating correlation operation after each compensation; and determining the Doppler frequency compensation value corresponding to the generated maximum correlation peak value as the optimal Doppler frequency estimation value. According to the method, the problem of discontinuous MCSK signal code phases in the capturing process is solved, and the signal capturing speed is greatly increased.

The application discloses a kind of distributed security transmission methods and communication systems based on intelligent reflecting surface, the method includes: transmitter carries out series-parallel conversion to binary data to be transmitted, obtains odd bit bit string and even bit bit string, and selects one bit string to carry out binary phase shift keying BPSK modulation, obtains BPSKI signal and sends.The BPSKI signal sent by transmitter reaches intelligent reflecting surface, IRS calculates phase offset coefficient, and the incident BPSKI signal is phase-shifted and reflected to obtain BPSKII signal, and BPSKII signal is reflected to receiver.The receiver superimposes the BPSKI signal directly from transmitter and the BPSKII signal reflected by IRS, and the signal obtained is the quaternary phase shift keying modulation QPSK signal carrying expected data, and the receiver recovers expected data using QPSK demodulation method.The application makes transmitter only send part data information, and signal is transmitted in two ways, which can effectively prevent the leakage of expected data information, thereby improving the security of communication system.

Methods, systems, and devices for wireless communications are described. The described techniques provide for a user equipment (UE) to communicate using binary phase shift keying (BPSK) modulation according to extended coding rates. In some cases, the UE may receive configuration information that supports modulation orders for BPSK modulation extended to include modulation orders otherwise only configured for quadrature phase shift keying (QPSK) modulation. Further, the UE may support dynamic switching between BPSK and QPSK modulation. For example, the UE may transmit or receive control signaling indicating a modulation order for an uplink transmission, where the UE or a network entity may determine which modulation scheme and order to use according to communication parameters associated with the uplink transmission, the UE, or both.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical downlink control channel (PDCCH) transmission. The UE may demodulate the PDCCH transmission in accordance with a binary phase shift keying (BPSK) modulation scheme based at least in part on the PDCCH transmission having an aggregation level that satisfies a threshold. Numerous other aspects are described.

A data transmission method and a related apparatus. A sending device performs binary phase shift keying BPSK mapping on a to-be-transmitted bit sequence to obtain a first sequence. The sending device performs coding modulation on the first sequence based on a generator matrix or a first sub-matrix including some rows of the generator matrix, to obtain a symbol sequence. The sending device sends the symbol sequence to a receiving device through a channel.

An FMCW radar-based target extraction method comprises: (a) transmitting a radar transmit signal, the radar transmit signal being BPSK (binary phase shift keying)-modulated based on a first binary code; (b) acquiring a radar receive signal reflected by a target; (c) multiplying the radar receive signal by a second binary code to generate a ghost-target signal; and (d) removing the ghost-target signal from the radar receive signal to extract a real target signal.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may generate a phase-ramped modulated data stream with a set of phase-shift keying (PSK) modulated symbols, wherein a phase-ramped modulation is applied to the set of PSK modulated symbols in a pre-discrete-Fourier-transform (pre-DFT) domain. The network node may transmit, to a user equipment (UE), the phase-ramped modulated data stream. Numerous other aspects are described.