未来宽带移动通信系统中LDPC码与OFDM技术的结合

Combination of LDPC codes with OFDM technology in Future Broadband Mobile Communication System

OFDM多频波调制技术是未来高速数字通信系统的核心技术。在其实现中,必须结合优秀的前向纠错码(Forward-error Correction Code)以降低误码率。卷积码、里德-所罗门码以及Turbo码都已相继使用在OFDM系统中。文章提出将LDPC码与OFDM系统相结合,通过分析可以发现它具有比Turbo码与OFDM系统的结合更好的性能。文章的最后还将给出一个LDPC与OFDM系统结合的概念性通信系统—LDPC-COFDM系统。

The OFDM multi-frequency wave modulating technology would be the core technology of the future high speed digital communications system. In its implementation, the outstanding forward error correcting code （Forward-error Correction Code） in order to reduce the error-bit rate. The convolution code, Reed-the Solomon code as well as the Turbo code have been used one after another in the OFDM system. This article suggests that, the LDPC code be combined with the OFDM system. And through the analysis it is found that this combination possesses much better performance as compared with the combination of the Turbo code with the OFDM system. Finally, this article also gives a LDPC-OFDM-Combined conceptive.