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比特交织编码调制(迭代译码)系统标识映射的对称性研究与应用

The Symmetries of Mappings of Bit-interleaved Coded Modulation (with Iterative Decoding) Systems and Its Applications
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摘要 该文从群论的角度分析了比特交织编码调制(迭代译码)(BICM(-ID))系统中标识映射的对称性。首先给出了标识映射对称性的定义,并指出,二进制标识映射的对称性是BICM(-ID)系统的固有特性,该对称性同构于m阶超立方的对称群。然后基于BICM(-ID)的对称性,提出一种改进的二进制交换算法(IBSA)。该算法的搜索空间为标识映射对称群陪集的代表系。因此,与传统的二进制算法相比,IBSA的搜索效率得到了提高。最后,2维16阶星座图的仿真结果表明,在40000次的运行过程中,IBSA能提高4%的搜索效率;32阶相移键控星座图的仿真结果表明,该算法至少可提高3.5%的搜索效率,单个映射的计算时间缩短了约4000倍。 Based on the group theory, the symmetries of mappings of Bit-Interleaved Coded Modulation (or with Iterative Decoding) systems (BICM(-ID)) are studied. Firstly, the definitions of the symmetries of mappings for BICM (-ID) are given. The symmetries of binary labels of a mapping are the intrinsic properties of BICM(-ID), which are isomorphic to the symmetry group of a hypercube of order m. According to the symmetries of BICM (-ID), an Improved Binary Switch Algorithm (IBSA) is proposed. The search space of IBSA is a transversal of the symmetry group of mappings. Consequently, the efficiency of IBSA is improved compared to the traditional BSA. Finally, Simulation results of a 16-ary two dimensional constellation show that the search efficiency of IBSA can be improved about 4% during 40000 trials. For 32-PSK, the results show that the search efficiency can be improved at least 3.5% and the time required to calculate a single mapping is shorten about 4000 times.
出处 《电子与信息学报》 EI CSCD 北大核心 2014年第1期48-54,共7页 Journal of Electronics & Information Technology
基金 国家自然科学基金(61102048) 国家自然科学基金重点项目(60837002) 国家973计划项目(2010CB328206) 中央高校基本科研业务费专项资金(2011JBM208) 北京交通大学人才基金(2006RC022)资助课题
关键词 无线通信 比特交织编码调制 标识映射 群理论 对称性 二进制交换算法 Wireless communication Bit-Interleaved Coded Modulation (BICM) Mapping Group theory Symmetries Binary Switch Algorithm (BSA)
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