基于分集的非相干多进制正交调制迭代译码研究  

Non-coherent M-ary orthogonal modulation and iterative decoding research with diversity

作　　者：韩明钥[1] 温亚萍[1] 张帅[2] HAN Mingyue;WEN Yaping;ZHANG Shuai(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang,Hebei 050081,China;No.31121 Unit of Chinese People′s Liberation Army,Fuzhou,Fujian 350000,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]中国人民解放军第31121部队,福建福州350000

出　　处：《河北工业科技》2024年第5期336-344,共9页Hebei Journal of Industrial Science and Technology

基　　金：河北省重点研发计划项目(18211021D)。

摘　　要：为了解决无线通信系统低速率传输面临的瞬时快衰落明显、归一化多普勒很大、接收信号弱等多种难题,提出了基于分集的非相干多进制正交调制迭代译码体制。首先,构建了非相干多进制正交调制迭代译码模型,给出了基于最大值映射的简化解调译码方法;其次,设计了基于分集的非相干多进制正交调制迭代译码系统方案,分析了信道容量极限关键参数,推算出编码码率与信噪比关系,提出了基于分集合并信号概率密度的性能分析方法;最后,采用蒙特卡洛仿真方法,结合高斯信道与瑞利衰落信道进行了系统仿真验证及性能分析。结果表明:在归一化多普勒0.5的瑞利衰落信道仿真环境下,采用16重分集、32阶正交调制、Turbo/低密度奇偶校验码(LDPC)迭代译码,编码码率为2/3、编码信息长度为384的设计方案,可实现信噪比低至3 dB时的稳定通信。所提出的基于分集的非相干多进制正交调制迭代译码方法,实现了低信噪比高可靠传输,可为低速率无线通信系统设计提供参考。In order to solve the various difficulties of low speed wireless communication,such as instantaneous fast fading,doppler spread and weak signal,a technical system of non-coherent M-ary orthogonal modulation and iterative decoding with diversity was proposed.Firstly,a system model of non-coherent M-ary orthogonal modulation was constructed,and a simplified demodulation and decoding based maximum mapping method was proposed.Secondly,the system scheme of non-coherent M-ary orthogonal modulation and soft iterative decoding with diversity was designed,and the key parameters for channel capacity limit was analyzed.The relationship between code rate and signal-to-noise ratio(SNR)was derived,and the performance analysis method of probability density with diversity merging signal was studied.Finally,using Monte Carlo simulation method,the system capacity performance was simulated and analyzed in AWGN channel and Rayleigh channel.The results indicate that using 16 diversity,32-ary orthogonal modulation,Turbo or LDPC iterative decoding,code rate of 2/3 and length of 384,the stable communication is achieved at the SNR of 3 dB in Rayleigh channel with the normalized doppler 0.5.The proposed method achieves reliable transmission with low SNR,which provides reference for the design of low-speed wireless communication system.

关 键 词：无线通信技术 多进制正交 非相干 瑞利信道 分集 概率密度 

分 类 号：TN914.3[电子电信—通信与信息系统]