Optimum asymmetric constellation design for trellis-coded modulation over gaussian channels
Optimum asymmetric constellation design for trellis-coded modulation over gaussian channels
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DOI：
10.1109/lcomm.2009.090513
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
Xiao-Xin Zhang;Yuping Zhao;L. Zou
中科院分区：
文献类型：
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作者：
Xiao-Xin Zhang;Yuping Zhao;L. Zou
本文研究了网格编码调制（TCM）中非对称星座的优化问题。与传统的最大化自由欧几里德距离的准则不同，这里的准则是最小化TCM系统的误码率。文中给出了一种推导任意TCM码误码率上界的简便方法，并提出了通过最小化该上界来设计最优非对称星座的方法。所给方法可应用于任意状态数的TCM系统。数值结果表明，所提出的方法设计的所有代码实现更好的BER性能比对称的。
This letter studies the optimization of asymmetric constellations for trellis-coded modulation (TCM). Unlike the conventional criterion of maximizing the free Euclidean distance, the criterion here is to minimize the bit error rate (BER) of TCM systems. The letter presents an easy way to derive the BER upper bound for any TCM codes, and proposes the method for designing optimum asymmetric constellations by minimizing the bound. The given method can be applied to TCM systems with arbitrary state numbers. Numerical results verify that all the codes designed by the proposed method achieve better BER performance than symmetric ones.