一种适合于衰落信道的BCM码的集分割映射方法

在瑞利衰落信道中,对于一个分组调制(Block Coded Modulation)码的构造通常是通过将具有尽可能大最小乘积距离和汉明距离的成分码与Ungerboeck的集分割映射相结合来实现的,但这种集分割映射方法使得构造的BCM码的路径复杂度大大增加,造成了系统性能的下降。文章给出了一种新的集分割映射方法。仿真结果表明,采用这种方法构造出的BCM码在瑞利衰落信道中的性能较前者有很大的改善。

A Method of Set Partitioning for BCM Codes on Fading Channels

Construction of a BCM code on the Rayleigh-fading channel can be realized by combining component codes, whose minimum product distance and Hamming distance are as large as possible, with set partitioning method proposed by Ungerboeck. However, using this mapping method, the complexity of a BCM code constructed is greatly increased, which makes a degradation of the whole performance. In the paper, a new set partitioning method is proposed. Simulation result shows that BCM codes constructed by this mapping method have a better performance than those constructed by using Ungerboeck set partitioning mapping.