Abstract: To eliminate the effect of inter-carrier interference(ICI) on MIMO-OFDM systems, an iterative channel estimation algorithm is proposed. Based on the frequency-domain orthogonal block pilot pattern, the new algorithm obtains a temporal channel response by the discrete Fourier transform(DFT) based channel estimation algorithm, and improves the estimation performance by the iterative channel estimation with noise reduction. With the channel pre-correcting and appropriate time-domain filtering, the new algorithm can effectively eliminate the effect of ICI and channel noises. Furthermore, owing to avoiding the inversion of a large matrix to decouple the inter-antenna interference, the new algorithm can be easily realized compared with the traditional algorithms.

Key words: MIMO-OFDM, noise reduction, channel Estimation, pilot