Parallel multiuser detection method in SCMA system

A multi-user detection and user technology, applied in transmission systems, digital transmission systems, forward error control, etc., can solve the problems of BER performance degradation, high detection complexity, MPA algorithm bit error performance degradation, etc., and achieve a good BER performance, sufficient parallel iteration, and the effect of improving reliability

Active Publication Date: 2017-10-20
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0004] The shortcomings of the parallel multi-user detection technology in the above-mentioned existing SCMA system are mainly manifested in: the detection complexity is too high, and it is not suitable for realization on hardware devices
Such as: the original MPA detection algorithm; although the detection complexity is greatly reduced, the BER performance is severely degraded, such as: the fixed-complexity SCMA multi-user detection algorithm based on partial marginalization and the existing threshold-based MPA algorithm. Among them, the existing threshold-based The bit error performance degradation of the MPA algorithm is especially serious at low thresholds

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[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0038] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...

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Abstract

The invention provides a parallel multiuser detection method in an SCMA system. The method comprises: during parallel iterative decoding of an SCMA system, if locations of greatest elements in a codeword confidence vector of a certain user node in ith iteration and (i-1)th iteration in an SCMA factor graph are different, the user node is determined to be unstable, a user corresponding to the user node can not be judged in advance, and a next iteration process is executed; and otherwise, the user node is determined to be stable and threshold condition judgment is carried out on the user corresponding to the user node. According to the method provided by the invention, on the basis of the existing threshold-based MPA algorithm, judgment on the stability of the user node is added; and only the user that meets the threshold condition and passes the user node stability judgment can be processed by decoding in advance. Therefore, reliability of judging the codeword by the threshold-based MPA algorithm in advance is improved; and the message iteration becomes sufficient on the condition of low threshold, so that the good BER performance is obtained.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a parallel multi-user detection method in an SCMA system. Background technique [0002] Orthogonal multiple access techniques (such as OFDMA used in 4G) are far from meeting the giant connections, higher spectral efficiency, and lower latency required by 5G. As a non-orthogonal multiple access technology based on a multi-dimensional codebook, the sparse code multiple access (SCMA) scheme can support a number of user connections far greater than the number of occupied orthogonal time-frequency resources. There are literatures comparing SCMA, Multi-User Shared Access (Multi-User Shared Access, MUSA) and Pattern Division Multiple Access (Pattern Division Multiple Access, PDMA), which are three typical Non-Orthogonal Multiple Access technologies (Non-Orthogonal Multiple Access) , NOMA) in a typical Rayleigh fading channel bit error rate (Bit ErrorRate, BER) performanc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0048H04L1/005H04L1/0051
Inventor 赵懿伟杨维
Owner BEIJING JIAOTONG UNIV
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