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Pilot Aided Channel Estimation for MIMO-OFDM Systems

An efficient channel estimation technique is described in this paper for Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) communications over frequency selective channel. Space Time Block Code (STBC) is used to estimate the channel in the frequency domain. The channel estimation technique uses pilot sequence inserted at the beginning of each transmitted OFDM block. Theory and methods are presented in details. The performances of the proposed algorithm are evaluated using software Matlab. Simulation results for different number of transmit and receive antennas are given. In this paper, a new channel estimation technique for MIMO-OFDM is proposed. Simple equations are derived. The algorithm can work for any modulation and any number of subcarrier. Moreover, this new scheme is able to work for any number of transmit and receive antenna and achieves good performances as it has only a 4dB loss compared to the ideal case. The paper is organized in the following way. First, a description of the system is given and STBC-OFDM is introduced. Then, the channel estimation technique is presented and equations of the new estimation technique are derived. Next, simulation results are shown for different numbers of transmit and receive antennas using 16- QAM modulation. Finally, conclusions are given.