4results about How to "Improve bit error performance" patented technology

The application discloses a kind of target-oriented photovoltaic receiver light communication and energy integration system limited dynamic range constraint emission waveform design method, first generate MLS sequence, simultaneously to the original signal of input PAM modulation obtains PAM sequence, PAM sequence is as slow envelope to MLS sequence mean envelope modulation, and the alternating current signal after envelope modulation is obtained, direct current bias B is superimposed in the alternating current signal to constitute the final emission waveform.The application B determines reference light intensity and effective AC budget.In available budget, communication level interval and perception MLS amplitude are determined by amplitude allocation factor ρ together.Under fixed AC budget, ρ determines the trade-off between communication and perception, and B determines the upper limit of feasible dynamic range.The application makes full use of limited amplitude resources, realizes low-bandwidth photovoltaic receiver-oriented efficient information extraction, accurate echo perception and stable energy transmission, and realizes flexible coordination of communication and energy functions.

The application discloses a neural network equalization method and device, equipment, storage medium and program product, and relates to the technical field of optical communication. The method comprises the following steps: acquiring a received signal sequence on a high-speed optical interconnection link; inputting the received signal sequence into a neural network equalizer for equalization processing to obtain an equalized output signal sequence; wherein the neural network equalizer comprises at least one backbone network composed of a one-dimensional convolution network and at least one learnable nonlinear activation layer; the nonlinear activation layer and the one-dimensional convolution network are alternately cascaded; the nonlinear activation layer is composed of a plurality of base functions through linear combination of learnable weight coefficients and is used for approximating nonlinear response on the high-speed optical interconnection link. The neural network equalization method can significantly improve the compensation capability for nonlinear distortion such as bandwidth limitation, modulation soft saturation and mode coupling under the premise of maintaining full one-dimensional convolution streamable inference, so as to reduce the bit error rate.

The application provides an LDPC decoder of a CCSDS near-earth satellite standard and a decoding method thereof, and relates to the field of wireless communication and signal coding and decoding, wherein the decoder comprises a frame synchronization module, a channel LLR storage module, a control module, a variable node updating module, a check node updating module, a data rearrangement module, an address generation module, a data shift module, a node message storage module and an output module. The application divides the cyclic submatrix of the CCSDS near-earth satellite code group into smaller non-cyclic submatrices, improves the decoding parallelism, stores the node messages of the same cyclic submatrix after block division in the same address of the RAM, and alternately writes the variable node and check node messages into the RAM, thereby saving the storage resources; the check function is realized with low overhead by expanding one bit of the node message to store the decision result; and the error code performance is improved by optimizing the two kinds of node updating modules.

The invention discloses a zero-forcing frequency domain equalization-based molecular code division multiple access system detection method and device. The method comprises the following steps of: constructing a molecular code division multiple access system; each nano emitter performs spectrum spreading on data by using a spectrum spreading sequence, and represents a molecular concentration signal of bit information by releasing A-type and B-type molecules; sampling the received molecular concentration signal at the fusion center, and determining a concentration difference observation value of A type molecules and B type molecules; on the basis of the observation value, organizing data in a block transmission mode and inserting a cyclic prefix to eliminate inter-block interference, and forming a time domain observation vector; converting the time domain signal into a frequency domain signal; suppressing inter-symbol, inter-chip and multi-access interference by applying a zero-forcing frequency domain equalization algorithm; performing inverse fast Fourier transform on the equalized signal, converting the equalized signal back to a time domain, and obtaining a judgment variable through de-spreading operation; and comparing the judgment variable with a zero threshold, if the judgment variable is greater than 0, judging as 1, otherwise, judging as-1, and outputting a decoding bit sequence.