An accelerator suitable for low-orbit satellite broadband communication

Abstract

The invention discloses an accelerator suitable for low-orbit satellite broadband communication, which improves the throughput rate of encoding and reduces the amount of data storage by adopting parallel calculation and cyclic shifting in the cyclic encoding part of the LDPC encoder; LDPC translation The decoder adopts a combination of block interleaving and partial parallel decoder to improve throughput, reduce processing delay, and save resources; Polar decoder ensures the correctness of decoding performance by saving more decoding paths, and at the same time It also uses CRC to perform redundancy check on information by sacrificing less information bits. After decoding, it uses CRC path calculation and selection module to realize CRC-assisted decoding, and adopts a pipeline-based folding structure, that is, the front of the current decoding unit If the number of calls of the first-stage decoding unit is less than the preset number of times, the previous-stage decoding unit is repeatedly called, so as to reduce resource occupation with a small time delay and improve high-speed communication quality.

Description

technical field [0001] The invention belongs to the technical field of low-orbit satellite tracking, and in particular relates to an accelerator suitable for broadband communication of low-orbit satellites. Background technique [0002] According to the development requirements of low-orbit satellite broadband Internet communication terminals in my country, the downlink peak rate is as high as 650Mbps, and a new channel coding and decoding (Polar and LDPC) scheme is introduced in the physical layer design standard. Polar and LDPC codes are currently recognized as better channel coding schemes, but there are still many difficulties in applying them to practical systems. The iterative decoding method used in LDPC codes and the sparsity of the check matrix make the decoding complexity linear in relation to the code length; Polar uses the SC (successive-cancellation) decoding algorithm, and the SC decoding algorithm codes Elements are continuously decoded in order, and the deco...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the short code length is used in the prior art to reduce the delay, and the advantages of the polar code cannot be fully utilized; the second is to use a long code to realize it with a serial or partially parallel hardware architecture, but the channel The throughput rate of encoding and decoding is too low, and the system delay is too large, which is not conducive to high-speed communication. Therefore, the present invention provides an accelerator suitable for low-orbit satellite broadband communication, so as to realize hardware acceleration of channel encoding and decoding and improve channel encoding and decoding. Throughput rate, reduce processing delay, improve high-speed communication quality

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