International Journal of Computer Networks and Wireless Communications (IJCNWC)
In this paper, the authors has proposed channel estimation algorithms for MIMO-OFDM systems based on the Least Squares (LS) and Minimum Mean Square Error (MMSE) algorithms. The presented LS algorithm employs the noise correlation in order to reduce the variance of the LS estimation error by estimating and suppressing the noise in signal subspace. The performance of the MMSE channel estimation algorithm is robust to the number of antennas in transmit and receive sides. The new algorithm attains a significant improvement in performance in comparison with that of the regular channel estimator.