电讯技术2017，Vol.57Issue(9)：1017-1022,6.DOI:10.3969/j.issn.1001-893x.2017.09.007
时变信道下ADF协作车载通信误码率分析
Symbol Error Rate Analysis of Adaptive Decode-and-Forward Vehicular Cooperative Communication in Time-varying Channels
摘要
Abstract
In intelligent vehicular cooperative systems, wireless communication channels are characterized as time-varying fading channels due to the rapid motion of vehicles. To evaluate symbol error rate( SER) performance,a first-order autoregressive(AR1) process is presented for the vehicular time-varying chan-nels,and an analytical approach of the AR1 process based on adaptive decode-and-forward( ADF) is pro-posed. In this method,the time-varying characteristics are described by correlation coefficient of Doppler shift,and whether the relay forwards information adaptively according to decoding result or not. As a re-sult,the reliability of the system can be enhanced. In addition,moment generating function( MGF) is used to derive the closed-form expressions for SER of M-ary quadrature amplitude modulation( M-QAM) under ADF cooperative strategy,and the influence of vehicular velocities and channel state information( CSI) esti-mation accuracy on SER performance is also analyzed. The results of numerical simulation show that the error floor value caused by high velocity can be reduced by increasing the CSI estimation accuracy. Com-pared with amplify-and-forward( AF) strategy,the average SER performance of the proposed strategy can be increased by 8. 7 dB.关键词
智能交通系统/车载协作通信/自适应解码转发/时变信道/误码率分析/矩生成函数Key words
intelligent transportation system(ITS)/vehicular cooperative communication/adaptive decode-and-forward(ADF)/time-varying channel/symbol error rate(SER) analysis/moment generating function(MGF)分类
信息技术与安全科学引用本文复制引用
邱斌,金晓晴,蒋为,陈雨宏,倪菊..时变信道下ADF协作车载通信误码率分析[J].电讯技术,2017,57(9):1017-1022,6.基金项目
广西自然科学基金重点项目 (2011GXNSFD018028) （2011GXNSFD018028）
桂林电子科技大学研究生教育创新计划资助项目(2016YJCXB05) （2016YJCXB05）
