采用Viterbi译码算法的自适应i型混合arq技术

S. Wicker
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引用次数: 14

摘要

结果表明,Viterbi译码算法可以在i型混合arq(自动重复请求)方案中得到改进。通过适当的定义,可以使部分路径度量与接收序列中的错误内容成正比。在解码完成之前,只要所有部分路径度量超过固定阈值,就会生成重传请求。阈值可以调整,以平衡可靠性和重传频率。该方案的实现将可靠性性能提高了几个数量级,代价是对基本Viterbi解码器进行最小的修改,并且在某些情况下,吞吐量的降低可以忽略不计
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An adaptive type-I hybrid-ARQ technique using the Viterbi decoding algorithm
It is shown that the Viterbi decoding algorithm can be modified for use in a type-I hybrid-ARQ (automatic-repeat-request) scheme. Through proper definition, the partial path metrics can be made directly proportional to the error content in a received sequence. Retransmission requests are generated whenever all partial path metrics exceed a fixed threshold before decoding is completed. The threshold may be varied to balance reliability with retransmission frequency. The implementation of this scheme increases reliability performance by several orders of magnitude at the expense of minimal modification to the basic Viterbi decoder and, in some cases, a negligible decrease in throughput.<>
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