论文部分内容阅读
将维特比译码算法加以改进,使其用于一种Ⅰ型混合ARQ方案中.通过合理地限制,使部分路径量度与接收序列中所含差错量成正比.在译码结束之前.每当所有各路径量度都超过某一固定门限时,则请求重发.为了平衡可靠性与重发次数.可以改变门限.要实现该方案,只需对基本维特比译码器稍加改变,即可使可靠性性能提高几个数量级,面且在某些情况下,通过率(throughput)的下降可忽略不计.
The Viterbi decoding algorithm is improved to be used in a Type I hybrid ARQ scheme, which is proportional to the amount of error contained in the received sequence by reasonably limiting, before decoding ends. Whenever All path metrics exceed a certain fixed threshold, then request retransmission.In order to balance the reliability and the number of retransmissions, the threshold can be changed.To achieve this scheme, simply change the basic Viterbi decoder, you can The reliability performance is increased by orders of magnitude, and in some cases the drop in throughput is negligible.