An encoding and decoding method and device

Abstract

Embodiments of the present invention provide an encoding and decoding method and device. When encoding a bit sequence to be encoded, the method first converts the bit sequence to be encoded into a first complex sequence, and extracts the real part and sum of the first complex sequence. The imaginary part generates the first real number sequence as the input information of the encoder to obtain the second real number sequence for encoding the sequence to be encoded, and then uses the second real number sequence to generate the second complex number sequence, and performs OFDM encoding processing on the second complex number sequence Afterwards, use the training sequence to generate OFDM frames. Compared with the prior art, this embodiment uses the encoder obtained by training the encoding-decoding deep neural network to encode the bit sequence to be encoded, which can reduce the bit error rate on the basis of ensuring that the transmission rate of the information is not affected .

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to an encoding and decoding method and device. Background technique [0002] Coherent optical orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology has become a promising modulation technology relying on its high-speed data transmission rate, high spectral efficiency and effective resistance to frequency selective fading, and and received widespread attention. However, OFDM also has inherent defects, such as high peak-to-average power ratio (PAPR, Peak to Average Power Ratio), and high sensitivity to frequency and phase noise. Such defects will cause errors in coherent optical OFDM communication systems. The code rate (BER, Bit Error Ratio) deteriorates. [0003] In view of the above-mentioned deterioration of the bit error rate, the coding method provided by the prior art is mainly the forward error correction code....

AI Technical Summary

Problems solved by technology

[0004] However, in the coherent optical OFDM communication system, with the increase of transmission distance and transmission rate, increasing the redundancy of information is not enough to counteract the damage caused by long transmission distance and high transmission rate, so the bit error rate will still increase significantly. Increase

At the same time, the redundancy of information increased by this encoding method will also significantly reduce the transmission rate of information

Images