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In this paper, an adaptive channel estimation for MIMO OFDM is proposed. A set of pilot tones first are placed in each OFDM block, then the channel frequency response of these pilot tones are adaptively estimated by recursive least squares (RLS) directly in frequency domain not in time domain. Then after the estimation of the channel frequency response of pilot tones, to obtain the channel frequency response of data tones, a new interpolation method based on DFT different from traditional linear interpolation method according to adjacent pilot tones is proposed. Simulation results show good performance of the technique.
A set of pilot tones first are placed in each OFDM block, then the channel frequency response of these pilot tones are adaptively estimated by recursive least squares (RLS) directly in frequency domain not in time domain. Then after the estimation of the channel frequency response of the pilot tones, to obtain the channel frequency response of the data tones, a new interpolation method based on DFT different from traditional linear interpolation method results show good performance of the technique.