一种水声通信中的自适应ARQ方案  

Adaptive ARQ Scheme for Underwater Acoustic Communications

作　　者：高明生[1] 陆佶人[1] 姜卫东[1] 

机构地区：[1]东南大学无线电工程系,南京210096

出　　处：《数据采集与处理》2005年第2期176-180,共5页Journal of Data Acquisition and Processing

基　　金：国家"十五"计划预研基金(10106050303)资助项目。

摘　　要：在水声通信系统中,由于水声信道的半双工、时变和长传播时延等特性,导致用于水声通信中的停等自动重传请求(SWARQ)方案的吞吐性能显著下降。本文首先利用扩频通信技术,将单个信道分成两个子信道:一个用于前向信道(从发送方到接收方),另一个用于反向信道(从接收方到发送方),充分地利用水声信道。在此基础上,结合选择自动重传请求(SRARQ)方案与返回-n自动重传请求(GBNARQ)方案的混合式自动重传请求(SR+GBNARQ)方案的优良性能,提出了一种随水声信道的时变特性改变分组长度的自适应ARQ方案。仿真结果表明:该方案能有效地提高水声通信系统的吞吐性能。Because of the characteristics of half-duplex, time-varying and large round trip delay in underwater acoustic channels, the throughput performance for stop-and-wait automatic repeat request (SW ARQ) drops drastically in underwater acoustic communication systems. Firstly, the half-duplex channel is divided into two subchannels: one is used as the forward channel (from the sender to the receiver), another as the backward channel (from the receiver to the sender), which adequately uses the underwater acoustic channels. Furthermore, based on the higher throughput performance for selective-repeat plus go-back-n scheme (SR+GBN ARQ), an adaptive ARQ scheme for changing the packet length according to the underwater acoustic time-varying channels conditions is presented. Simulation results show that the proposed ARQ scheme can efficiently improve the throughput performance of underwater acoustic communication systems.

关 键 词：水声通信 半双工 时变 长传播时延 自动重传请求 

分 类 号：TN913.21[电子电信—通信与信息系统]