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Comparative Study of Turbo Equalization Schemes using Convolutional, Convolutional Turbo, and Block-Turbo Codes

机译：使用卷积，卷积Turbo和块Turbo码的Turbo均衡方案的比较研究

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摘要

Turbo equalizers have been shown to be successful in mitigating the effects of inter-symbol interference introduced by partial response modems and by dispersive channels for code rates of $R le 1/2$. In this contribution, we comparatively studied the performance of a range of binary phase-shift keying turbo equalizers employing block-turbo codes, namely Bose–Chaudhuri–Hocquenghen turbo codes, convolutional codes, and convolutional turbo codes having high code rates, such as $R = 3/4$ and $R = 5/6$, over a dispersive five-path Gaussian channel and an equally weighted symbol-spaced five-path Rayleigh fading channel. These turbo equalization schemes were combined with an iterative channel estimation scheme in order to characterize a realistic scenario. The simulation results demonstrated that the turbo-equalized system using convolutional turbo codes was the most robust system for all code rates investigated. Index Terms—Bose–Chaudhuri–Hocquenghen codes, convolutional codes, iterative decoding, iterative equalization, joint equalization and decoding, turbo codes, turbo decoding, turbo equalization.
机译：已经证明，Turbo均衡器可以成功地缓解部分响应调制解调器和色散信道对于$ R le 1/2 $的码间干扰带来的影响。在此贡献中，我们比较研究了一系列采用块涡轮代码的二进制相移键控涡轮均衡器的性能，即Bose–Chaudhuri–Hocquenghen Turbo代码，卷积代码和具有高编码率的卷积Turbo代码，例如$在色散五径高斯信道和等权符号间隔五径瑞利衰落信道上，R = 3/4 $和$ R = 5/6 $。这些turbo均衡方案与迭代信道估计方案结合在一起，以表征现实情况。仿真结果表明，使用卷积turbo码的turbo均衡系统对于所研究的所有码率都是最可靠的系统。索引词-Bose-Chaudhuri-Hocquenghen码，卷积码，迭代解码，迭代均衡，联合均衡和解码，turbo码，turbo解码，turbo均衡。

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