Analysis Of channel estimators in FFT based OFDM systems

With the increasing demand for better performance, capacity and higher bit rate in wireless communication systems, it is necessary to integrate wide variety communication services such as high speed data, video and voice signals. In this paper we propose to study the performance of channel estimation based on the algorithms LS, MMSE, P-MMSE and SP-MMSE in OFDM (Orthogonal Frequency Division Multiplexing) system, which suffers from various interference losses. Here, the parameters MSE, BER, SNR are considered for the analysis of a better estimator to obtain maximum channel state information. Through the simulation results, it can be established that the estimators PMMSE and SP-MMSE has a considerable lower MSE (Mean Square Error) than the other estimators. The BER performance of PMMSE and SP-MMSE is also much better than that of the conventional estimators like LS, MMSE.