车联网中基于有效信噪比的HARQ-CGM系统性能研究  

Performance of HARQ-CGM in internet of vehicles based on effective SNR

作　　者：余作奔[1] 吕心浩 岑岗[1] 王中鹏[1] 吴茗蔚[1] YU Zuoben;LYU Xinhao;CEN Gang;WANG Zhongpeng;WU Mingwei(School of Information and Electronic Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China)

机构地区：[1]浙江科技学院信息与电子工程学院,杭州310023

出　　处：《浙江科技学院学报》2018年第6期468-473,487,共7页Journal of Zhejiang University of Science and Technology

基　　金：国家自然科学基金项目(61302112;61571316);浙江省"钱江人才计划"D类项目(QJD1402023);教育部留学回国人员科研启动基金项目(教外司留[2013]1792号);浙江科技学院"科大青年英才"项目(浙科院人[2014]9号)

摘　　要：针对重传协议的重传能耗问题,对信道增益监测(CGM)技术进行研究,给出了CGM接收端码字接收概率与系统平均传输次数的关系函数,并在车联网中引入了CGM技术。仿真结果表明,只有当有效信噪比大于最小有效信噪比时,CGM技术才能提高车联网HARQ-CGM系统的可靠性。在低传统信噪比下,CGM技术不仅未能明显提高系统的可靠性,还增加了系统的重传能耗,此时系统到达指定误比特率所需实际有效信噪比大于车联网HARQ系统。此外,随着信道增益阈值的增加,系统的最小有效信噪比逐渐增加。In response to the retransmission energy consumption problem of the retransmission protocol, channel gain monitoring （CGM） was resorted to and incorporated in internet of vehicles （IOV） by studying the performance of CGM and formulating the acceptance probability as a function of the average number of transmissions. The simulation results showed that CGM could improve reliability of the HARQCGM system only when the effective signal-to-noise ratio （SNR） was greater than the minimum effective SNR. At low conventional SNR, CGM not only failed to improve reliability of the system, but also results in an increase in the retransmission energy consumption of the system. Therefore, the actual effective SNR required by the system to reach the specified bit error rate （BER） was greater than HARQ in IOV. In addition, as the gain threshold increased, the minimum effective SNR of the system gradually increased.

关 键 词：车联网 长期演进技术-车载通信 有效信噪比 信道增益监测 混合自动重传请求协议 

分 类 号：TN761.92[电子电信—电路与系统]