一种瑞利衰落信道下的自适应选择重传ARQ算法  

An Adaptive Selective Repeat ARQ Scheme under Rayleigh Fading Channel

作　　者：杨英[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2007年第3期36-39,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60372099);国家"863计划"项目(2001AA123016);教育部博士点基金项目(11111104042)

摘　　要：根据信道状态变化自适应的调整发送模式即发送分组长度,建立了信道状态和发送模式合并后的多状态马尔可夫模型,提出了一种瑞利衰落信道下的自适应选择重传SR-ARQ算法,推导了理想和非理想自适应SR-ARQ吞吐量的闭合解.根据理想SR-ARQ的状态转移图获得非理想SR-ARQ系统参数的最优解.仿真结果表明,利用系统参数优化后的自适应SR-ARQ和理想自适应SR-ARQ的吞吐量性能基本一致,在大范围信噪比下,比未经过参数优化的自适应SR-ARQ的吞吐量性能都有提高.An adaptive selective automatic repeat request scheme under Rayleigh fading channel is pro- posed, which adjusts the transmission modes such as packet sizes according to the channel state variation. Multi-state Markov system model is generated after the channel variation state and the transmission mode are united. Closed form expressions of throughput efficiency of ideal and non-ideal adaptive selective repeat automatic repeat request（ARQ） are derived . Furthermore, system parameters of nonideal adaptive selective repeat ARQ are optimized based on ideal adaptive selective ARQ state transition graph . Simulation results verify that the throughput efficiency of non-ideal adaptive selective ARQ with optimum system parameters is nearly equal to that of ideal adaptive selective ARQ and better than that of non-ideal adaptive selective ARQ without optimum system parameters in a wide range of signal to noise ratio.

关 键 词：瑞利衰落信道 马尔可夫模型 自适应选择重传ARQ 吞吐量 

分 类 号：TN911.22[电子电信—通信与信息系统]