论文部分内容阅读
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。
In order to improve the accuracy of channel estimation and improve the performance of time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system over fading channels, an iterative NR (Nordstrom-Robinson) translator is proposed in transmit diversity TDS- Code Assisted Channel Estimation Method. The method utilizes the bit-assisted pilot channel estimation after NR decoding, and the updated channel estimation results are re-assisted with NR decoding. After the iteration is completed, the NR decoding result is inter-frame deinterleaved, and finally, the final bit stream is decoded through low-parity parity-check (LDPC) decoding. The simulation results show that the proposed method can effectively improve the channel estimation accuracy and achieve significant diversity gain when used in transmit diversity TDS-OFDM system under the condition of only one iteration.