Raptor码在下行协作无线蜂窝系统中的研究  

Research on Raptor Code for Downlink Cooperative Wireless Cellular Networks

作　　者：张鸿涛[1] 王晓湘[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《系统仿真学报》2008年第24期6710-6713,共4页Journal of System Simulation

基　　金：国家"863计划"资助项目(2007AA01Z265);国家自然基金项目(60742006)

摘　　要：不同于传统的采用固定码率编码的协作中继系统,在发送端不知道信道状态信息(channel state in formation,CSI)时,提出协作蜂窝系统下行链路中使用无限码率Raptor码及分布式空时分组码(distributed space-time block code,DSTBC)的新方案,并研究该方案有效性、可靠性和健壮性的问题。理论分析和仿真结果证明,当发送端不知道CSI时,结合应用Raptor码和DSTBC,即使在低信噪比(signal-to-noise ratio,SNR)环境中仍能降低总传输时间及能量消耗,给无线蜂窝系统带来显著的性能增益。Differed from literatures on cooperative relay system adopting a conventional fixed-rate code （traditional code）, the rateless code, i.e., Raptor code, to cooperative wireless cellular system was studied In particular, the efficiency, reliability and robustness of cooperative communication in a wireless cellular downlink environment were analyzed by employing a new scheme based on combining a Raptor code with distributed space-time block code （DSTBC）, when channel state information （CSI） was not available at the transmitter. Based on theoretical analyses and simulation results, it is shown that without channel state information at the transmitter, the cooperative wireless cellular system using Raptor code and DSTBC yields significant performance gain, i.e., reducing the total transmission time and energy consumption, even in a low signal-to-noise ratio （SNR） environment.

关 键 词：无限码率编码 RAPTOR码 协作分集 分布式空时分组码(DSTBC) 

分 类 号：TN911[电子电信—通信与信息系统]