发射分集TDS-OFDM系统中迭代NR译码辅助的信道估计  

Iterative NR decoding aided channel estimation for TDS-OFDM systems with transmit diversity

作　　者：周晓[1] 杨昉[1] 宋健[1] 

机构地区：[1]清华大学电子工程系微波与数字通信国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2012年第5期623-626,631,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金创新研究群体科学基金项目(61021001)

摘　　要：为了改善信道估计的精度并提高时域同步正交频分复用(TDS-OFDM)系统在衰落信道下的性能,在发射分集TDS-OFDM系统中提出了一种迭代NR(Nordstrom-Robinson)译码辅助的信道估计方法。该方法利用对NR译码后的比特辅助指导信道估计,更新后的信道估计结果又重新辅助进行NR译码。完成迭代后,对NR译码结果进行帧间解交织,最后经过低密度奇偶校验(low-density parity-check,LDPC)译码输出最终的比特流。仿真结果表明:该方法应用于发射分集TDS-OFDM系统中在仅迭代1次的条件下即能有效改善信道估计的精度,获得显著的分集增益。An iterative Nordstrom-Robinson（NR） decoding aided channel estimation method is presented for time-domain synchronous orthogonal frequency division multiplexing（TDS-OFDM） systems with transmit diversity to improve the channel estimates and the performance of TDS-OFDM systems with fading channels.The NR decoded bits are used to perform the channel estimations,with the updated channel estimation results then utilized for the NR decoding.After several iterations,the NR decoded bits are inter-frame de-interleaved and LDPC decoded to obtain the final output bits.Simulations show that this method effectively improves the channel estimation accuracy in systems with transmit diversity after only one iteration to achieve significant diversity gain.

关 键 词：时域同步正交频分复用(TDS-OFDM) NR(Nordstrom-Robinson)码 信道估计 发射分集 

分 类 号：TN911.5[电子电信—通信与信息系统]