A Joint Iterative Algorithm for LDS Mmultiuser Detecting and LDPC Code Decoding

doi:10.13190/j.jbupt.2017.04.020

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2017, Vol. 40 ›› Issue (4): 122-127.doi: 10.13190/j.jbupt.2017.04.020

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A Joint Iterative Algorithm for LDS Mmultiuser Detecting and LDPC Code Decoding

LEI Wei-jia, LIU Yue-cen, XIE Xian-zhong

Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Communications, Chongqing 400065, China

Received:2017-05-20 Online:2017-08-28 Published:2017-07-10

Abstract

Abstract: The LDS multiuser detection algorithm was researched to improve the performance of LDS system. A joint scheme of multiuser detection and channel decoding in LDS non-orthogonal multiple access systems was introduced. The reliability of multiuser detection was improved by transmitting users’ soft information after LDPC decoder back to multiuser detector. The performance of channel decoding was further improved by the enhancement of multiuser detection. Simulations, comparing with multiuser detecting and LDPC code decoding separately under the same conditions, indicate that the joint iterative algorithm can significantly improve the performance of BER. It is shown that the larger the system load is, the greater the performance improvements. At the same time, the difference in error performance between different users also reduces by the joint scheme. With the joint iterative algorithm, the performance of BER is almost same as that of single user even when the system load reaches 200%. The performance of the LDS system is significantly improved without increasing computational complexity of receiver by the joint scheme.

Key words: non-orthogonal multiple access, low-density spreading, low density parity check code, joint iteration

CLC Number:

TN929.5

LEI Wei-jia, LIU Yue-cen, XIE Xian-zhong. A Joint Iterative Algorithm for LDS Mmultiuser Detecting and LDPC Code Decoding[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2017, 40(4): 122-127.

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A Joint Iterative Algorithm for LDS Mmultiuser Detecting and LDPC Code Decoding

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