In this paper, based on thecharacteristic of long round trip delay, an efficient ARQ protocol, which is suitable for half-duplex channels, is presented byremarkably shortening the responding time of each packet data.

• 本文针对水声信道长传播时延这一特点,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),从而使得对每个分组数据的响应时间大大缩短,提出了一种有效的适合于半双工特性的ARQ协议。