A ka-band deep space communication method and system for a q-ldpc-lt cascaded fountain code scheme

Abstract

The invention provides a Ka frequency range deep space communication method and system of a q-LDPC-LT cascade fountain code. The method comprises that an LT encoder encodes original data to generate first data; a q-LDPC encoder encodes the first data to generate second data using a low density sparse parity check matrix construction method with an LU decomposition encoding algorithm; a q-LDPC decoder decodes the second data to generate third data; the second data is decoded to generate the third data, wherein error code detection is performed after bit decision of each coding iteration and error bits are searched and corrected; an LT decoder decodes the second data to generate decoding data; and the second data is decoded to generate the decoding data, wherein when there is no encoding data package with the degree of 1, a data package with the degree of 1 is constructed to perform decoding. The invention can reduce the encoding complexity, improve the encoding efficiency, and further improving the decoding reliability, thereby reducing dependence of decoding on the existence of an encoding data package with the degree of 1.

Description

technical field [0001] The invention relates to the technical field of deep space communication, in particular to a Ka frequency band deep space communication method and system of a q-LDPC-LT cascaded fountain code scheme. Background technique [0002] In recent years, low-density parity-check code (LDPC) is a linear block code based on sparse check matrix, which has performance close to the Shannon limit and hardware-realizable encoding and decoding complexity, but the operation of LDPC The complexity is high, the bit error rate is high, and the reliability of information transmission cannot be guaranteed. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a Ka-band deep-space communication method and system of the q-LDPC-LT cascaded fountain code scheme, which can reduce the bit error rate performance and improve the reliability of information transmission. [0004] In order to solve the above technical problems,...

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Problems solved by technology

[0002] In recent years, low-density parity-check code (LDPC) is a linear block code based on sparse check matrix, which has performance close to the Shannon limit and hardware-realizable encoding and decoding complexity, but the operation of LDPC The complexity is high, the bit error rate is high, and the reliability of information transmission cannot be guaranteed

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