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本文介绍采用新I/Ⅱ型ARQ方式的实验室测试设备的开发工作.这种新的Ⅰ/Ⅱ型ARQ方式适用于陆地移动前向卫星线路.信道特性的研究表明虽然使用卷积码可以消除前向卫星通信线路中的随机差错,但还需使用ARQ方式来克服由于信号阻塞所引起的衰落. 为了实现V iterb i解码和数据包同步,硬件使用了市售的68000控制的VEM插件板及一些专用插件板. 由于受时间限制,给出的是硬件在高斯噪声条件下工作的结果,未用卫星衰减模拟.为了确保高度的数据完整性,数据包使用了差错检验技术,使残余差错率小于10~(-11),由于受时间限制这一点未被证实,然而长期测试确实表明差错率低于10~(-8).
This article describes the development of a new type I / II ARQ laboratory test equipment that is suitable for land mobile forward satellite lines. The study of channel characteristics shows that although the use of convolutional codes can eliminate Random errors in the forward satellite communications line, but ARQ is also required to overcome the fading caused by the signal congestion.To achieve Viterb i decoding and packet synchronization, the hardware uses a commercially available 68000 controlled VEM plug-in board and Some proprietary boards, as a result of time constraints, give the result of hardware operating under Gaussian noise, not simulated by satellite attenuation In order to ensure a high level of data integrity, the packet uses error-checking techniques that allow the residual error rate Less than 10 ~ (-11), due to the time limit is not confirmed, but long-term tests do show that the error rate is less than 10 ~ (-8).