17 results about "Bpsk modulation" patented technology

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.

The invention provides an adaptive modulation switching method for satellite-ground laser communication. The performance of a communication system is improved by using 16QAM (Quadrature Amplitude Modulation) and BPSK (Binary Phase Shift Keying) modulation adaptive switching; the method comprises the following steps: firstly, carrying out polarization code coding on an information sequence, scattering the sequence through an interleaver, and then modulating the sequence through a modulator and sending the modulated sequence to a satellite-ground laser communication channel. An atmospheric turbulence estimation module is introduced at a receiving end, estimated atmospheric channel state information is fed back to a sending end through an estimated value of satellite-ground laser communication atmospheric turbulence intensity, then a modulation mode of the sending end is switched according to a threshold value, and low-time-delay reliable transmission of satellite-ground communication laser communication is achieved.

The invention provides a communication method and communication equipment. The method comprises the steps that a first device sends a first signal and a second signal on different transmission layers to a second device through the same antenna, the first signal and the second signal are data subjected to DFT-S-OFDM processing, the modulation mode used for modulating the first signal and the second signal in the DFT-S-OFDM processing process is pi / 2-BPSK, and the modulation mode used for modulating the first signal and the second signal in the DFT-S-OFDM processing process is Pi / 2-BPSK. A phase difference of pi / 2 exists between the first signal and the second signal. Through the combination of DFT and a pi / 2-BPSK modulation mode, the PAPR can be effectively reduced on the basis of expanding the coverage area, and the first device sends the first signal and the second signal of different transmission layers through the same antenna and forms a pi / 2 phase difference, so that the second device can distinguish the first signal and the second signal transmitted on the same antenna, and the transmission efficiency of the first device is improved. And the spectrum efficiency is further improved on the basis of not increasing the PAPR.

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.

The invention relates to the technical field of electric power communication and battery management, and discloses a BPSK communication and battery impedance measurement method and system based on multi-sine disturbance, and the method comprises the steps: a communication channel between a transmitting end and a receiving end is realized through power line communication, a BPSK modulation signal and a plurality of sine disturbance signals with independent frequencies are synchronously generated at the transmitting end, a PWM duty ratio is calculated, and a BPSK modulation signal and a plurality of sine disturbance signals with independent frequencies are generated at the receiving end; after being superposed, the signals are injected into a battery side through a power converter, and a switching device of the power converter is driven through a PWM duty ratio; sampling a communication signal at a receiving end, generating a demodulation reference signal, and judging a sending bit of the communication signal; and acquiring a voltage signal and a current signal of the power converter under the sine disturbance signal, extracting an orthogonal component under each frequency of the sine disturbance signal, and calculating apparent power and a phase angle according to the orthogonal component so as to calculate the battery impedance. Real-time measurement of power line communication and battery impedance can be realized at the same time, power interference is reduced, and the integration level is improved.

This invention relates to the field of channel communication technology, specifically disclosing a method for improving the communication performance of plasma sheath channels based on fountain code soft decoding. After establishing a plasma channel model, the amplitude attenuation function follows a log-normal distribution, and the phase shift function follows a Gaussian distribution. The probability densities of the amplitude attenuation function and the phase shift function are calculated respectively. Then, combined with the plasma channel model, the conditional probability density of the plasma sheath channel for matched filtering of the received signal is calculated. The log-likelihood ratio in the plasma sheath channel under BPSK modulation of ideal channel information is calculated, as well as the likelihood probability value and log-likelihood ratio of the received signal under unknown plasma sheath channel parameters. This determines the initial values ​​for iteration, which are then used for fountain code soft-decision decoding. This invention enables the reuse of usable information in discarded fountain code packets, thereby further improving the utilization rate of fountain code packets and enhancing the overall communication efficiency of the plasma sheath channel.

This application proposes a method, computer device, and storage medium for decoding NAND Flash data. The method includes: receiving a modulation request for an original codeword and performing BPSK modulation on the original codeword to obtain a first value and a second value; adding noise to the first and second values ​​according to a preset Gaussian distribution to obtain a target Gaussian distribution and a target codeword; when there are overlapping regions in the target Gaussian distribution, calculating the boundaries of the overlapping regions to obtain a target boundary to obtain a target region; dividing the target region into LLR regions to obtain thresholds for multiple LLR regions; performing LLR quantization on the target codeword according to the thresholds of the multiple LLR regions to obtain LLR information of the target codeword; and inputting the LLR information of the target codeword into LDPC for decoding to obtain decoded information. This application makes the decoding error correction performance obtained by LDPC simulation more reliable, practical, and closer to the decoding error correction performance in NAND Flash module applications.

The disclosure provides a communication method, a communication device and a communication system, and relates to the technical field of communication. The method comprises the following steps: a terminal receives first information sent by a network device, and then determines a MCS index range corresponding to a first modulation mode in a MCS table according to the first information. For example, for a higher code rate π / 2-BPSK modulation mode, the terminal can accurately determine the MCS index range of the π / 2-BPSK modulation mode in the MCS table. Subsequently, the terminal can accurately use the higher code rate π / 2-BPSK modulation mode for uplink data transmission according to the indication of the network device, effectively reduces the PAPR, thereby improving the spectral efficiency and improving the uplink coverage.

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.

Methods and apparatus, including computer program products, are provided for pi / 2 BPSK initial access. In some example embodiments, there may be provided a method that includes receiving, at a user equipment, information indicating network support of an initial network access based on a pi / 2 binary phase shift keying (pi / 2-BPSK) modulation and coding scheme; and performing, in response to the received system information, the 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.

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.

The invention discloses a code selection N-path filter which comprises an eight-path parallel processing structure, and each path comprises a first group of BPSK modulation switch circuits, an intermediate-stage four-order low-pass filter circuit and a second group of output switch circuits. The input end of the filter realizes single-end-to-differential connection through the Balun, and the output end of the filter realizes differential-to-single-end output through the Balun. According to the invention, an eight-path time-sharing processing technology of PN code modulation is adopted, strong self-interference suppression is realized by dynamically controlling signal phase inversion, and a differential low-pass filter adopting a capacitance multiplexing technology and a negative impedance design is adopted in an intermediate stage to improve frequency selectivity. Particularly, the switching circuit adopts a three-stage stacking structure to enhance the power processing capability, the clock system adopts an innovative five-tube AND gate design to realize low-jitter PN code modulation, and the output end realizes broadband tuning through the programmable clock system. The method can be widely applied to a full-duplex communication system, and the problems of in-band self-interference and out-of-band interference are effectively solved.

The invention discloses a constellation aggregation frequency offset blind estimation method suitable for a high-speed mobile scene, and the method comprises the steps: carrying out the down-conversion and matched filtering of a received wireless signal for BPSK and MSK modulation signals in a low signal-to-noise ratio and high-dynamic environment, and obtaining a baseband complex signal sequence; aiming at the baseband complex signal sequence in the BPSK modulation form, adopting direct square law transformation to eliminate phase modulation information; an I / Q orthogonal decoupling architecture is adopted for an MSK signal, point-by-point square operation is performed on an in-phase component and an orthogonal component respectively, then subtraction is performed, symbol modulation is eliminated, and then FFT spectrum analysis is performed to estimate Doppler frequency offset. And finally, obtaining a frequency spectrum through windowing FFT transformation, and estimating Doppler frequency offset through peak search. According to the method, the limitation of a traditional pilot frequency method on short sequence precision is broken through, the noise amplification effect of a quadruple spectrum method is effectively overcome, and high-precision and low-complexity carrier frequency offset estimation can still be realized by using a full data segment under a low signal-to-noise ratio.

The invention belongs to the technical field of positioning, and relates to an STM32-based miniaturized low-power-consumption calling beacon machine and a search and rescue system. According to the invention, the hardware combination of the AD9364 chip, the STM32F103 low-power-consumption ARM chip and the FPGA is adopted, and the sleep state control design is matched, so that the electric quantity loss in the standby and invalid communication process of the beacon machine is effectively reduced, and the low-power-consumption operation is realized; the endurance time of the equipment is longer than 48 hours, the 12-hour golden rescue period of maritime search and rescue is fully covered, and the problem that the rescue opportunity is missed due to the fact that a traditional beacon machine is too high in power consumption and not timely in electric quantity supplement is thoroughly solved. By adopting the BPSK modulation mode, a complex modulation-demodulation circuit is not needed, the hardware design difficulty is reduced, and the anti-noise performance, the spectrum utilization rate and the communication stability are remarkably improved; the problem that the signal-to-noise ratio and the spurious-free dynamic range are deteriorated due to the fact that the AD / DA radio frequency front end is affected by clock jitter, power noise and electromagnetic interference is effectively solved.

The application discloses a satellite security communication method based on a QC-LDPC-based McEliece cryptosystem, and belongs to the technical field of information security. The application analyzes QC-LDPC code characteristics for the QC-LDPC code-based McEliece cryptosystem, and constructs a generation matrix G and a check matrix H of the QC-LDPC code based on a random difference group method. Based on the McEliece cryptosystem, a key for satellite security communication is constructed. The satellite security communication method fusing encryption and error correction is used to realize encryption and error correction cascading for plaintext, and to ensure the security and reliability in the communication process. A pseudo-random sequence is generated by using a pseudo-random number generator linear feedback shift register, an error vector is generated according to the pseudo-random sequence and the check matrix, and a sending message is obtained. A modulation signal is generated by using BPSK modulation. After the modulation signal is transmitted through an AWGN channel, a receiving signal for a satellite security communication receiving end is generated. Decryption and decoding are carried out at the receiving end, and satellite security communication of the QC-LDPC-based McEliece cryptosystem is realized.

This invention discloses a method and system for processing transmit and receive data in an MSK spread spectrum system. The spread spectrum sequence d is obtained through a spread spectrum module. n The modulation sequence b is obtained through the BPSK modulation module. n The MSK modulated signal I-channel SigI is obtained through the MSK modulation module. n and Q road SigQ n The MSK signal demodulation module is used to obtain the demodulated D signal. k The despreading module is used to obtain the despreading soft information Ds. m The method and system described above further simplify the MSK spread spectrum system by obtaining the received information bits through the BPSK demodulation module. While ensuring the performance of the MSK spread spectrum system, the implementation complexity of the MSK spread spectrum system transceiver end is reduced by the phase interleaving change law of the IQ path.

The invention discloses a single Beidou satellite positioning method and a diagnosis system. The method comprises the following steps: a non-Beidou satellite has a same-frequency signal with the same frequency as a specific frequency band signal of any frequency band of a Beidou satellite; the same-frequency signal and the specific-frequency-band signal are jointly input into a second filter to suppress the same-frequency signal so as to output a filtered baseband signal, the baseband signal is input into a baseband processor, and the baseband processor only demodulates the BPSK modulation signal to obtain first data; in the first data, only the data packet conforming to the Beidou navigation message format and the Beidou protocol is processed. Therefore, after the mixed signal comprising the specific frequency band signal and the same-frequency signal is received, the mixed signal comprising the specific frequency band signal and the same-frequency signal can be processed for multiple times and in multiple stages based on a mode that the filter filters and the baseband processor only processes the BPSK modulation signal and a mode that only Beidou data is processed in the first data; therefore, the signal of the non-Beidou navigation system is prevented from interfering with the single Beidou system in the embodiment.