作　　者： (高红山）; (高凡琪）;

机构地区： 中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处： 《无线电工程》 2017年第9期38-43,共6页

摘　　要： 为了提升DFT-S-OFDM系统在瑞利信道下的传输性能,采用位交织编码调制迭代译码方案(BICM-ID)、旋转映射(R-QAM)和Turbo码等技术,设计了基于Turbo-BICM-ID的DFT-S-OFDM系统。给出了系统原理框图,对编码调制系统的解调译码迭代算法进行了推导,对系统进行了Matlab仿真验证。仿真结果表明,与传统的卷积码设计方案相比,该设计方案在误码率为10-5时,可以获得5.7 d B的增益改善,同时可以获得更低的错误平层,有效地改善了DFT-S-OFDM系统在瑞利信道下的性能。 In order to improve the transmission performance of DFT-S-OFDM system in Rayleigh channel, a scheme based on Turbo-BICM-ID using methods of BICM-ID （ Bit Interleaved Coded Modulation with Iterative Decoding scheme） , R-QAM （ Rotated QAM） and Turbo codes is provided. The design block diagram is given and the detailed derivation of the iteration algorithm for demodulation and decoding is presented,the performance is simulated through Matlab.The simulation results show that as compared with the conventional eonvolutional codes scheme ,the proposed design achieves 5.7 dB gain improvement when BER = 10-s, and a lower error floor is obtained,resulting in a great improvement of DFT-S-OFDM＇ s performance in Rayleigh channel with only a very small increase in complexity.

关 键 词： 位交织编码调制迭代译码 旋转映射 码