Improved DFT-based Channel Estimation in OFDM Systems Based on Phase Compensation

Based on frequency domain pilot channel estimation is a typical technology of channel estimation in OFDM system. In most cases, the pilot configuration of the system can’t start from the first subcarrier, which will have an effect on channel estimation values at the pilot, especially in the algorithm of channel estimation based on DFT interpolation which will largely degrade the performance of the algorithm. The study analyses and deduces in detail phase offsets and the compensation technology under the condition of noninteger multiple of the multipath delay and non-integer multiple of the number of pilot. The simulation results show that the proposed phase compensation technology can effectively improve the performance of the channel estimation.