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MULTI-MODE LDPC DECODER FOR USE IN DEEP SPACE COMMUNICATION
MULTI-MODE LDPC DECODER FOR USE IN DEEP SPACE COMMUNICATION
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机译：深空通信用多模LDPC译码器
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摘要
The present invention relates to the technical fields of digital signal processing and integrated circuits, specifically to a multi-mode LDPC decoder for use in deep space communication. The present invention is oriented towards the CCSDS space communication standard, wherein deep space communication LDPC codes have a quasi-cyclic structure; on the basis of said structure, in the present invention, a TDMP algorithm is used for the decoding procedure and an NMSA algorithm is used for information updating; and an information processing unit is configured to implement a decoder structure that supports multiple modes and can be configured on the basis of external parameters. The present invention balances decoding performance and throughput rate, selecting a suitable number of decoding iterations to ensure that said two important indicators meet the corresponding requirements. FPGA test results show that the present invention can support decoding of three code types with an information frame length before encoding of 1024 and code rates of 1/2, 2/3, and 4/5, the coding gain in the three working modes respectively reaching 5 dB, 7 dB, and 8 dB, and the decoder throughput reaching more than 100 MHz.
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