基于无率纠错码和高阶QAM调制的收端速率自适应方案

发布时间：2018-01-16 08:21

本文关键词：基于无率纠错码和高阶QAM调制的收端速率自适应方案　出处：《电子学报》2017年08期 　论文类型：期刊论文

【摘要】：现有的自适应解调方案中调制阶数最高仅限于16,且方案分析和设计中没有考虑信道编码的译码环节.本文研究适用于高阶QAM的自适应解调算法,并结合无率纠错码提出一种收端速率自适应方案.接收端有多种解调模式,每种解调模式删除一个符号中不同数量的、似然比绝对值最低的几个比特,以提高解调比特的可靠度和平均互信息.从互信息分析的角度,得到在满足要求的译码误码性能时,译码所需要的码字长度的理论结果,进一步给出在译码复杂度约束条件下解调模式的选择方案.以256-QAM调制星座和Raptor码为例对方案进行了仿真,验证了理论分析的正确性和方案的有效性.
[Abstract]:In the existing adaptive demodulation schemes, the maximum modulation order is limited to 16, and the decoding link of channel coding is not considered in the scheme analysis and design. In this paper, an adaptive demodulation algorithm suitable for high-order QAM is studied. The receiver has multiple demodulation modes, each demodulation mode removes a different number of bits in a symbol, and the likelihood is lower than the absolute value of several bits. In order to improve the reliability and average mutual information of demodulated bits, from the angle of mutual information analysis, the theoretical results of decoding codeword length are obtained when the performance of decoding error code meets the requirements. Furthermore, the scheme of demodulation mode selection under the constraint of decoding complexity is given. The simulation of the scheme is carried out by taking 256-QAM modulation constellation and Raptor code as examples. The correctness of the theoretical analysis and the validity of the scheme are verified.
【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(No.61471076) 重庆市基础与前沿研究计划(No.cstc2015jcyj A40047) 长江学者和创新团队发展计划(No.IRT1299) 重庆市教委科学技术研究项目(No.KJ1600413)
【分类号】：TN911.3
【正文快照】： 1引言自适应编码调制(AMC,Adaptive Modulation andCoding)[1]技术是通信系统中的链路自适应技术之一,虽然此技术能够适应信道特性波动,实现可靠和高效的信息传输,但是反馈的开销较大,反馈控制的复杂度高,同时由于反馈时延带来的信道状态信息误差可能导致AMC设置出现偏差.对于

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