OFDM联合预编码算法研究

Joint Precoding Algorithm for OFDM Systems

首先分析了预编码算法对信道估计和数据检测错误率的影响。前人运用的固定预编码处理方法,其仅考虑了信道估计的单方面问题,本文综合考虑了估计误差和检查误差,提出了一种联合哈达玛预方案。该方案在发射端运用联合哈达玛矩阵预编码对发送数据进行联合预处理,简化了接收端,提高了系统的分集增益。在良好的信道估计前提下,本方案能获得较好的误码率性能。仿真结果表明当误码率为10-3,该预编码方案能获得3dB的编码增益。

The study analyzes the impact of the precoding algorithm for channel estimation error and data detection error. Instead of only considering one aspect of channel estimation, as done in previous works where a fixed precoding matrix is used, the paper considers both estimation error and detection error, and then proposes a joint Hadamard precoding scheme. The proposed scheme utilizes a combined Hadamard matrix precoding at the transmitter, simplified the receiver and increased the diversity gain of the sys- tem. The method can achieve good bit - error - rate （BER） on the premise of good estimation of the channel. The simulation results show that the proposed precoder scheme can achieve more than 3dB code gain when the BER is 10-3