Systems Engineering and Electronics ›› 2021, Vol. 43 ›› Issue (3): 847-853.doi: 10.12305/j.issn.1001-506X.2021.03.31

• Communications and Networks • Previous Articles     Next Articles

Joint detection and decoding algorithm based on SCMA and convolution coding

Hongwei ZHAO1(), Chunyang LIU1(), Li XU2(), Xia LUO2()   

  1. 1. School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
    2. Beijing Research Institute of Telemetry, Beijing 100076, China
  • Received:2020-05-21 Online:2021-03-01 Published:2021-03-16

Abstract:

With the increasing number of satellite constellations and satellites, it is urgent to solve the problem of multiple access for a large number of users in satellite tracking, telemetry and command (TTC). Sparse code multiple access (SCMA) technology can carry more users on limited channel resources, which is expected to solve the problem of multiple access of large-scale satellites in TTC. Aiming at the unsatisfactory decoding performance of traditional SCMA decoding method——massage passing algorithm (MPA), a novel joint detection and decoding (JDD) algorithm based on SCMA and convolutional coding is proposed to update multiple rounds of logarithmic likelihood information and provide iteration in probability domain for multi-satellite data crossover, so as to improve the decoding performance of the system. Analysis and simulation results show that the JDD algorithm based on SCMA and convolutional coding can effectively improve the user capacity of the space-based TTC system and the bit error performance of the system under the condition of the moderate algorithm complexity.

Key words: sparse code multiple access (SCMA), convolution coding, exchange of likelihood information, joint detection and decoding (JDD)

CLC Number: 

[an error occurred while processing this directive]