LDS多用户检测和LDPC码译码的联合迭代算法

发布时间：2018-05-16 13:28

本文选题：非正交多址接入 + 低密度扩展　；参考：《北京邮电大学学报》2017年04期

【摘要】：为了提高低密度扩展(LDS)系统性能对LDS多用户检测算法进行研究,提出了一种LDS非正交多址系统中多用户检测和信道编码译码联合迭代的方案.将各用户低密度奇偶校验码(LDPC)译码后的软信息回传给多用户检测器,提高了多用户符号检测的可靠性,而多用户检测性能的提高又进一步提高了LDPC码译码的性能.在相同条件下与多用户检测和LDPC码译码单独进行的方案进行了仿真对比,结果表明,联合迭代算法明显改善了误比特率,系统负载越大,联合迭代带来的性能改善也越大.同时,联合迭代还缩小了不同用户误码性能的差异且即使在系统负载达到200%时,误码性能也与单用户的性能相差不大.联合迭代算法在不增加接收机计算复杂度的情况下,显著提升了LDS系统的性能.
[Abstract]:In order to improve the performance of low density expansion (LDS) system for LDS multiuser detection algorithm, a scheme of multiuser detection and channel coding and decoding joint iteration in LDS non orthogonal multiple access system is proposed. The soft messages after the decoding of each user low density parity check code (LDPC) are returned to the multiuser detector, and the multiuser symbols are improved. The detection performance is reliable, and the performance of multiuser detection is improved. The performance of LDPC code decoding is further improved. Under the same condition, the simulation comparison with the multi user detection and LDPC code decoding is carried out. The results show that the joint iterative algorithm obviously improves the bit error rate, the system load is larger, the performance of the joint iteration is changed. At the same time, the joint iteration also reduces the difference in the error performance of different users, and even when the system load reaches 200%, the error performance is not quite different from that of the single user. The joint iterative algorithm significantly improves the performance of the LDS system without increasing the computational complexity of the receiver.

【作者单位】：重庆邮电大学移动通信技术重庆市重点实验室;
【基金】：国家自然科学基金项目(61471076) 重庆市教委科学技术研究项目(KJ1600413) 长江学者和创新团队发展计划项目(IRT1299) 重庆市科委重点实验室专项经费项目(CSTC)
【分类号】：TN911.22

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