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A message passing decoding method in scma system

A technology of message passing and decoding methods, applied in the field of high-efficiency decoding algorithms, can solve the problems of high decoding complexity at the signal receiving end and does not meet actual communication requirements, and achieves outstanding substantive features, reduced computational complexity, and significant progress. Effect

Active Publication Date: 2021-05-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The Maximum A Posteriori Probability (MAP) algorithm is the optimal multi-user detection scheme for SCMA systems. Its computational complexity increases exponentially with the number of users, and the decoding complexity at the signal receiving end is too high to meet the actual communication requirements.

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  • A message passing decoding method in scma system
  • A message passing decoding method in scma system
  • A message passing decoding method in scma system

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Embodiment Construction

[0017] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings of the embodiments, so as to make the technical solution of the present invention easier to understand and grasp, so as to define and support the protection scope of the present invention more clearly.

[0018] In the SCMA system considered now, there are mainly J users sharing K consecutive resource blocks. For each user j∈{1,2...,J}, they will log 2 M binary bit values ​​are mapped to a K-dimensional complex codeword x j , and this complex codeword is derived from the transmitted codebook χ j selected in |χ j |=M means that the size of the codebook is M, that is, each codebook has M codewords. The overload rate of this system is λ=J / K, where λ>1. The SCMA encoder can be described as a mapping process, which contains a K-dimensional complex codebook of size M. There are different codewords in the codebook, and these codewords a...

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Abstract

A Message Passing Decoding Algorithm (ET‑MPA) based on the Euclidean distance threshold in the SCMA system, for the message passing algorithm (MPA) used by the decoder of the SCMA system, a large number of useless overlapping codewords will be calculated during the decoding process , to increase the complexity, the proposed solution is to delete the overlapped codepoints (SCP) to be calculated before performing the iterative operation of the MPA algorithm, and divide the overlapped codewords selected to participate in subsequent operations into reliable sets; the remaining The unreliable set is discarded and does not participate in subsequent operations. In this way, the number of overlapping codewords and the amount of computation needed to be calculated by the message passing algorithm in the second step are greatly reduced compared with the computation amount of the original message passing algorithm (MPA). Simultaneously, when deleting overlapping codewords, the overlapping codewords that have almost no influence on decoding are discarded, so the decoding performance of the invention is basically consistent with that of the original message passing algorithm.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a high-efficiency decoding algorithm at a receiving end in an SCMA system. Background technique [0002] Driven by the rapid development of mobile Internet and Internet of Things (Io T0) services, massive mobile device connections and extremely low air interface delays in the future pose more severe challenges to wireless air interface technology. Therefore, in order to meet the fifth The application scenario requirements of the Fifth Generation (5G), the traditional Orthogonal Multiple Access (OMA) technology can no longer meet the requirements of future wireless communication development, such as time division multiple access, frequency division multiple access, etc. So some Non-orthogonal Multiple Access (NOMA) technologies have been proposed, and new multiple access technologies have become the key research issues of wireless communication. [0003] SCMA technology is a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0051H04L1/0052
Inventor 孙君闵宝成
Owner NANJING UNIV OF POSTS & TELECOMM
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