Turbo-decoding without SNR estimation
Turbo-decoding without SNR estimation
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DOI：
10.1109/4234.848410
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发表时间：
2000-06-01
期刊：
影响因子：
--
通讯作者：
Wehn, N
中科院分区：
文献类型：
--
作者：
Worm, A;Hoeher, P;Wehn, N
理论上，当使用MAP或Log-MAP组成解码器时，需要估计SNR。SNR失配对Turbo码误比特率性能的影响和好的方差估计器的设计已经被一些作者所解决。在这封信中，我们研究了Turbo码译码的SNR灵敏度与Log-MAP和Max-Log-MAP组成解码器，分别在AWGN和瑞利衰落信道。我们的理论和仿真结果表明，从实际的角度来看，估计的SNR是没有必要的。我们的设置与未来移动的通信系统的解码器实现方面是一致的。
Theoretically, it is necessary to estimate the SNR when using a MAP or Log-MAP constituent decoder. The effect of an SNR mismatch on the bit error rate performance of Turbo-codes and the design of good variance estimators have been addressed by several authors.In this letter, we study the SNR sensitivity of Turbo-decoding with Log-MAP and Max-Log-MAP constituent decoders, respectively, for AWGN and Rayleigh fading channels. Our theoretical and simulation results indicate that an estimation of the SNR is not necessary from a practical point of view. Our setup is aligned with decoder implementation aspects of future mobile communication systems.