A multiple-input multiple-output (MIMO) communication system combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable

high data rate transmission over broadband wireless channels. Channel state information for both single-input single-output (SISO) and MIMO systems based on pilot aided arrangement is

investigated in this paper. The estimation of channel at pilot frequencies with conventional Least Square (LS) and Minimum Mean Square (MMSE) estimation algorithms is carried out

through Matlab simulation. The performance of MIMO OFDM and SISO OFDM are evaluated on the basis of Bit Error Rate (BER) and Mean Square Error (MSE) level.-A　multiple-input multiple-output (MIMO) communication system　combined　with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable

high data rate transmission　over broadband wireless channels. Channel　state information　for both single-input single-output (SISO) and MIMO　systems based on pilot aided arrangement　is

investigated　in this paper. The estimation of channel at pilot frequencies with conventional Least Square (LS) and Minimum Mean Square (MMSE) estimation algorithms　is　carried out

through Matlab simulation. The performance of MIMO OFDM and SISO OFDM are　evaluated　on the basis of Bit Error Rate (BER) and Mean Square Error (MSE)　level.