Improvement of Channel Estimation in MIMO-OFDM Using Improved LS Algorithm on Multipath Channels

In high capacity systems, as the bit transmission rate increases, Inter Symbol Interference (ISI) caused by the multi-path channel reduces the system efficiency. Orthogonal Frequency Division Multiplexing (OFDM) technique acts very well against this phenomenon. Moreover, an accurate estimation of the communication channel coefficients improves the performance of communication systems effectively. In this paper, for Multiple Input Multiple output(MIMO) systems using OFDM technique that is based on the least Squares (LS) algorithm, an improved channel estimation algorithm is presented. Accordingly, investigating the channel estimation method, we can design optimum training courses for these systems based on LS algorithm. Simulation shows the efficiency of suggested LS algorithm. We also provided the results of the communication channel estimation.