Nakagami-m水声信道中HARQ的性能分析  

Performance analysis about HARQ in Nakagami-m acoustic channel

作　　者：周卫星[1] 孙川[1] 支琤[1] 王若擎[1] 

机构地区：[1]上海交通大学上海市数字媒体处理与传输重点实验室,上海200240

出　　处：《信息技术》2012年第5期121-124,129,共5页Information Technology

摘　　要：水声信道的多径扩展严重、环境噪声高、带宽受限、传输时延大等特点,极大地制约了水声通信系统的可靠性和有效性。以水声信道为研究对象,从理论上分析了Nakagami-m信道衰落模型下基于HARQ的期望吞吐率,并就给定的调制编码方案,给出了链路吞吐率的仿真。仿真结果表明,随着m值的增大,链路的期望吞吐率增大;但是,当m>2时,相同信干噪比条件下链路的吞吐率比较接近。同时,水声信道中节点相对移动速度对链路吞吐率没有显著影响。Acoustic channel experiences severe multi-path extension, high ambient noise, limited bandwidth and large transmission and propagation delay, thus greatly reducing the reliability and effectiveness of acoustic communication system. Major research of this paper is to study acoustic channel, analyze expected throuput based on HARQ in Nakagami-m fading channel. And simulation of throughput was given based on a given modulation and coding scheme. The simulation results showed that, with larger m expected throuput got larger, but throuput at the same SNR got closer when m 〉 2. Meanwihle, relative speed has little impact on the expected throuput in acoustic channel.

关 键 词：水声信道 混合自动重传 Nakagami—m 期望吞吐量 

分 类 号：TN929.3[电子电信—通信与信息系统]