时变信道下车载HDAF协作通信误码性能分析  

Symbol-Error-Rate Performance Analysis of Hybrid Decode-Amplify-Forward Vehicular Cooperative Communication in Time-Varying Channel

作　　者：邱斌 肖海林[1] 聂在平[3] 金晓晴[1] QIU Bin;XIAO Hai-lin;NIE Zai-ping;and JIN Xiao-qin(Key Laboratory of Cognitive Radio and Information Processing, Guilin University of Electronic Technology Guilin Guangxi 541004;College of Information Science and Engineering, Guilin University of Technology Guilin Guangxi 541004;School of Electronic Science and Engineering, University of Electronic Science and Technology of China Chengdu 611731)

机构地区：[1]桂林电子科技大学认知无线电与信号处理教育部重点实验室,广西桂林541004 [2]桂林理工大学信息科学与工程学院,广西桂林541004 [3]电子科技大学电子科学与工程学院,成都611731

出　　处：《电子科技大学学报》2018年第3期382-388,共7页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(61261018;61472094);广西省自然科学基金杰出青年基金(2014GXNSFA118007);浙江省重点研发计划项目(2018C01059)

摘　　要：车辆快速移动带来的信道时变特性降低了智能车载协作系统的误码性能。因此,该文提出了一种基于一阶自回归模型(AR1)的车载混合译码放大转发(HDAF)协作通信方法,该方法通过AR1的多普勒频偏相关系数来刻画时变信道特性,根据信道增益自适应选取HDAF协作通信方式,提升了智能交通系统的可控性安全。同时,分析了车载移动速度和信道状态信息(CSI)估计精度对误码性能的影响。数值分析表明,车载系统能通过增加CSI的估计精度,有效地减少车辆快速移动引起的误码平顶值。该方法相对于放大转发(AF)和解码转发(DF)协作通信方式,平均误码性能分别提高了约3.6 d B和1.5 d B。Vehicle rapid movement causes time varying channel, which will reduce the symbol error rate（SER） performance of intelligent vehicular cooperative system. Based on first-order autoregressive（AR1） model, a hybrid decode amplify forward（HDAF） cooperative strategy is presented, where the characteristics of timevarying channel are described by correlation coefficient of Doppler shift. The proposed strategy can select adaptively cooperative approach according to the variation of channel gain, and thus the controllable security of intelligent transportation system is enhanced. Moreover, vehicular velocities and estimation precision of channel state information（CSI） are analyzed. Numerical results show that the improvement of the CSI estimation precision will reduce the error-floor-value caused by vehicle rapid movement. Compared to amplify and forward（AF） and decode and forward（DF） strategies, the SER performance of the proposed strategy can be increased about 3.6 d B and 1.5 d B, respectively.

关 键 词：混合译码放大转发 误码率 时变信道 车载协作通信 

分 类 号：TN929.5[电子电信—通信与信息系统]