Adaptive channel estimation based on the MIMO-OFDM preamble

The multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) is one of core technologies for the third generation (3G) and fourth generation (4G) communication systems. The efficient channel estimation scheme with relatively low estimation error is required for the MIMO-OFDM communication system. In this paper, we propose a channel estimation scheme based on the adaptive algorithm such as the least-mean-square (LMS) and a preamble signal architecture considering the guard subcarrier, which is suitable to MIMO-OFDM. The proposed algorithm which estimates channels in the time-domain has not only the low channel estimation error but the low peak-to-average power (PAPR) comparing to conventional techniques such as the least-square (LS). Computer simulation results are provided to illustrate the performance of the proposed algorithm for the channel estimation.