A channel estimation method based on frequency-domain pilots and time-domain processing for OFDM systems

作者：Li, MQ^*; Tan, JG; Zhang, WJ

来源：IEEE Transactions on Consumer Electronics, 2004, 50(4): 1049-1057.

DOI：10.1109/TCE.2004.1362498

• OFDM
• channel estimation
• cyclic correlation
• DFT

A channel estimation method based on frequency-domain pilots and time-domain processing (FPTP) is proposed for OFDM systems in time-varying channels. Through Discrete Fourier Transform (DFT), the channel impulse response (CIR) is estimated by using the frequency-domain pilots, which is equivalent to the CIR estimated by cyclic correlation using time-domain pilot sequence. Hence, the channel estimation error, caused by the spectral leakage of the DFT, can be reduced by canceling the non-idea auto-correlation property of the pilot sequence in time-domain. At the same time, the complicated cyclic correlation computation in time-domain is evitable. The theoretical analysis and simulation results show that the proposed method outperforms the traditional DFT-based method and Wiener filter algorithm in time-varying multi-path fading channels. Moreover, the uncoded bit error rate (BER) performance of proposed algorithm is very close to that with perfect channel knowledge, especially in fast fading channels.(1)

• 出版日期2004-11
• 单位上海交通大学