46results about How to "Reduce communication bit error rate" patented technology

The invention relates to a collecting method for the wireless data of an optic fiber gyroscope. The collecting method includes as follows: firstly a source data processing module collects and clears up the data outputted by the optic fiber gyroscope and then transmits to a RF transmitting module; the RF transmitting module transmits the data which plus the corresponding address and is checked; then a RF receiving module receives a RF signal and intercompares check codes; if correct, the signal is then transmitted to a target data processing module; if wrong, a marking signal is returned back to lead the RF transmitting module to transmit the original data again; finally the target data processing module clears up the data and then transmits the data to a computer; the method realizes the data communication by a non-contact RF method and can directly output the data by a RF mode without the slide ring of a turntable, thus leading the whole data collecting system to be more flexible and solving the problem of frequent errors caused by using the slide ring of the turntable to transmit signals.

The invention relates to an X-ray source for spatial X-ray communication based on energy load signals; a cathode assembly of the X-ray source comprises an electron emission source, a power supply rod,power supply rod insulation ceramic, a cathode cover and a cathode barrel; a focusing electrode assembly comprises a focusing electrode diaphragm and a focusing electrode barrel; an anode assembly comprises an anode diaphragm and an anode barrel and is connected with a multi-target transmission window assembly through the anode barrel; an electric field modulation assembly comprises a multi-section electrode and an electrode bracket; and the multi-target transmission window assembly comprises metal target materials, a transmission window and a target welding ring. According to the X-ray source for spatial X-ray communication based on energy load signals in the invention, a fast-response high-frequency pulse modulation electric field modulation assembly is utilized to generate a modulationelectric field, the electronic motion track is changed, the different metal target materials on the multi-target transmission window assembly are bombarded, and characteristic X-rays with different energy are generated. The characteristic X-rays with various kinds of energy are used as code elements, so that rapid X-ray spatial communication based on energy load signals is achieved. The X-ray source in the invention is high in modulation speed, large in number of the loadable code elements, high in signal-to-noise ratio, low in error rate and high in communication speed.

The invention relates to a low-frequency through-the-earth communication system and a low-frequency through-the-earth communication method based on a superconducting quantum interference device (SQUID) array. The system is characterized by sequentially consisting of low-frequency signal transmission, wireless transmission earth channel and signal reception and analysis based on the SQUID array, wherein the signal reception based on the SQUID array integrates integration of multiple superconducting SQUID devices, a reading circuit matched with the SQUID array and Dewar which provides a low-temperature environment for the SQUID array. When the system is used, a multi-channel crosstalk solution method and a weak signal processing method are required to be considered. The signal to noise ratio of signal reception and signal reception accuracy can be improved on the basis, and the communication error rate is reduced.

A discrete Fourier transform extended orthogonal time-frequency-space modulation method, the digital baseband signal is firstly processed by DFT precoding and delay-Doppler domain mapping, and then input to the OTFS modulator for transmission and reception, and the received signal is timed Extend Doppler domain inverse mapping processing and IDFT decoding processing to realize modulation and demodulation. Compared with the existing waveform OFDM and DFT-s-OFDM, the present invention can reduce the bit error rate under the high Doppler spread channel and at the same time reduce the peak-to-average power ratio of the transmitted signal.

The invention relates to a carrier digital pulse interval modulation C-DPIM (carrier digital pulse interval modulation) power line data communication method and a transceiver device. Use linear sweep SSC spread spectrum carrier or 50KHZ-535KHZ narrowband carrier signal sequence to generate DPIM pulse, and use pulse interval to realize DPIM symbol encoding. The duration of the carrier signal is equal to or less than the time width of a basic time slot (slot) describing the time interval between two pulses in the DPIM system. Impulse preamble is introduced as a synchronization signal for transmitting data blocks to prevent error propagation. And using the single chip microcomputer to realize the carrier digital pulse interval modulation (C-DPIM) communication method, developed the power line carrier communication interface transceiver device, in the power line network environment where the correct communication cannot be realized by using INTELLON SSC P300 transceivers and methods, using C - The DPIM communication method realizes the ideal power line carrier communication.

The invention relates to a limited feedback precoding method based on a short wave multi-antenna system. The limited feedback precoding method specifically comprises the following steps that (1) a codebook is designed; (2) a rotating Grassmann codebook under a short wave multi-antenna system channel is obtained, (3) a sending end inputs a code stream, modulates the code stream, and multiplies the modulated code stream by a precoding vector w to generate a sending signal vector; (4) a receiving end conducts channel estimation to obtain an instant channel matrix H; (5) according to the rotating Grassmann codebook obtained in the step (2), the optimum codon w is selected, a serial number corresponding to the w is returned to the sending end through a feedback channel, and the sending end updates the precoding vector w according to the serial number; (6) the receiving end adopts the maximum likelihood method for conducting signal detection and generates an output code stream after demodulation. Compared with the prior art, the correlation of the short wave channel is considered, the bit error rate of short wave multi-antenna system communication is lowered, and the signal transmission reliability is improved.

The invention discloses a short guard interval multi-carrier shallow seawater acoustic communication method and system. The method includes: estimating a delay spread of a channel according to a preamble sequence of a data frame, the data frame including a preamble sequence and a data block; determining a plurality of analysis time windows according to the delay spread, wherein each analysis time The starting positions of the windows are different; demodulate the data blocks under each analysis time window to obtain the demodulation result corresponding to each analysis time window; determine the bit error rate of each demodulation result; The minimum rate demodulation result is the target communication data. The invention adopts multiple parallel analysis time windows to analyze and process the data block, selects the best analysis time window through the bit error rate to eliminate the inter-carrier interference (ICI), and then reduces the system performance when the guard interval is short (high communication rate). communication bit error rate.