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工程科学与技术:2014,46(2):133-139
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Nakagami-m信道中基于矩生成函数的HARQ性能分析
(1.重庆邮电大学 信号与信息处理重庆市重点实验室;2.重庆邮电大学 通信与信息工程学院;3.重庆航天火箭电子技术有限公司)
Performance Analysis of HARQ for Moment Generating Function in Nakagami-m Fading Channels
(1.Chongqing Key Lab. of Signal and Info. Processing(CQKLS&IP),Chongqing Univ. of Posts and Telecommunications;2.School of Communication and Info. Eng.,Chongqing Univ. of Posts and Telecommunications;3.Chongqing Aerospace Launch Vehicle Electronic Technol. Co.,Ltd)
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投稿时间:2013-06-18    修订日期:2014-01-14
中文摘要: 针对多支路两跳协作中继系统,提出了一种基于Nakagami-m衰落信道的M-QAM和HARQ联合优化方案。该方案利用矩生成函数,计算了协作与非协作下各个节点对应的SNR的概率密度分布函数,推导了M-QAM和HARQ联合时系统误符号率的闭合表达式,进一步通过中继的状态转移概率,分析推导出协作HARQ下系统吞吐量的闭合表达式。理论分析和仿真验证得出:随着调制阶数M的减小,系统误符号率减小;协作HARQ比非协作明显降低了系统误符号率,提高了系统吞吐量;随着参与协作的中继个数的增加,系统吞吐量增大,系统误符号率减小。
Abstract:A joint optimization algorithm which combines M-QAM with HARQ protocol is proposed for the multi-branch two-top cooperation diversity system to minimize the symbol error rate (SER) and maximize the throughput. Using moment generating function (MGF), the probability density function of SNR among relay nodes and the destination node were calculated, and the formulas of the SER for M-QAM were derived in non-cooperative and cooperative HARQ protocols over Nakagami-m fading channels. Then, by utilizing the state transition probability of relay, the throughput in closed-form in cooperative HARQ protocols was derived. The simulation results showed that the decrease of modulation order Mcould lead to the decrease of the SER, and cooperative HARQ protocols by MGF could obtain lower SER and better throughput compared with non-cooperative HARQ protocols. In view of M-QAM with HARQ protocol, the increment of relay could lead to the increment of system throughput and the decrement of the SER, and then the performance of System is improved.
文章编号:201300620     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(61371164;61071196;61102131;61275099);教育部新世纪优秀人才支持计划项目(NCET-10-0927);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金资助项目(CSTC2011jjjq40002);重庆市自然科学基金资助项目(CSTC2010BB2398;CSTC2010BB2409;CSTC2010BB2411;CSTC2012JJA40008);重庆市教育委员会科研项目(KJ120525);重庆邮
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陈昌川,饶毓,赵超莹.Nakagami-m信道中基于矩生成函数的HARQ性能分析[J].工程科学与技术,2014,46(2):133-139.
Chen Changchuan,Rao Yu,Zhao Chaoying.Performance Analysis of HARQ for Moment Generating Function in Nakagami-m Fading Channels[J].Advanced Engineering Sciences,2014,46(2):133-139.