Joint precoding algorithm for OFDM blind channel estimation

The paper proposes a joint precoding algorithm for cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) system that enables blind channel estimation. 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 method can achieve good bit-error-rate (BER) on the premise of good estimation of the channel. Some experimental results for Rayleigh channel are included to support these conclusions. In addition, it illustrates better performance of the proposed method. When the BER is 10^-3,the proposed scheme can achieve more than 3dB code gain, compared with previous proposals.