基于OFDM移动多媒体通信系统中BITCM的评估  

Evaluation of bit-interleaved turbo-coded modulation in OFDM-based future mobile communications

作　　者：刘培[1] 葛建华[1] 刘刚[1] 

机构地区：[1]西安电子科技大学国家重点实验室,陕西西安710071

出　　处：《吉林大学学报（信息科学版）》2004年第1期18-22,共5页Journal of Jilin University（Information Science Edition）

摘　　要：针对基于OFDM(OrthorgonalFrequencyDivisionMultiplexing)未来移动多媒体通信系统中的BITCM(Bit-InterleavedTurbo-CodedModulation)的性能进行了评估,经研究发现,对于移动多媒体通信系统中通常采用帧的大小,在有效的信噪比区域内,Turbo编码的约束长度的增加并不一定会给BITCM的性能带来大的改善,相反,在某些情况下它还有可能导致性能的降低。笔者从Turbo码的重量分布角度对这种现象给出了解释,而且从性能评估结果中得出结论,对基于OFDM的移动多媒体通信系统的BITCM,在约束长度为4时具有最好的性能与复杂度之间的转换特性。The performance of Bit-Interleaved Turbo-Coded Modulation(BITCM) in future multimedia mobile communications is evaluated. It is observed that for the frame size commonly used in future multimedia mobile communication systems, a larger constraint length in Turbo codes does not necessarily introduce significant improvement in the BITCM performance in the signal-to-noise ratio range of interest, and it even leads to performance degradation in some cases. An explanation is provided from the viewpoint of weight distribution of Turbo codes. Extensive performance evaluation indicates that BITCM with constraint length of four has a good trade-off between the performance and complexity for the OFDM-based future multimedia mobile communication systems.

关 键 词：移动多媒体通信 比特交织Turbo编码调制 正交频分复用 Turb0码 约束长度 重量分布 

分 类 号：TN919[电子电信—通信与信息系统]