Comparative analysis of two realizations for hybrid-ARQ error control
Comparative analysis of two realizations for hybrid-ARQ error control
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混合ARQ差错控制两种实现方式的比较分析
DOI：
10.1109/ctmc.1994.512588
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Rice
中科院分区：
文献类型：
--
作者：
M. Rice
本文研究了在相干慢衰落莱斯信道下混合ARQ差错控制的实现和性能。使用具有软判决维特比解码的卷积码进行纠错，有两种方法用于实现表征混合ARQ差错控制的同时差错检测能力：（1）两码方法，其基于高速率CRC码对信息进行预编码，并对维特比解码器的输出执行错误检测，（2）单码方法，其修改维特比解码器以在维特比解码过程期间拒绝具有低可靠性的分组。结果表明，双码方法比单码方法具有更强的鲁棒性，在瑞利衰落下实现了最显着的性能优势。双码方法提供可接受的错误率性能，并提供对平均SNR变化不像单码方法那么敏感的吞吐量特性。由于这两种方法的实现复杂度相当，因此双码方法是平坦衰落信道上混合ARQ的优选实现方式。
This paper addresses the implementation and performance of hybrid-ARQ error control on a coherent slowly fading Ricean channel. Using a convolutional code with soft-decision Viterbi decoding for error correction, there are two methods for realizing the simultaneous error detection capability which characterizes hybrid-ARQ error control: (1) a two code approach which pre-encodes the information based on a high rate CRC code and performs error detection on the output of the Viterbi decoder, (2) a single code approach which modifies the Viterbi decoder to reject packets with low reliability during the Viterbi decoding process. The resulting analysis shows that the two code method is more robust than single code method with the most significant performance advantages realized for Rayleigh fading. The two code approach provides acceptable error rate performance and offers a throughput characteristic which is not as sensitive to changes in the average SNR as the single code approach. Since the implementational complexity of the two methods is comparable, the two code method is the preferred implementation for hybrid-ARQ on flat fading channels.