CHANNEL ESTIMATION SCHEME USING SUPERIMPOSED PILOT WITH LOW COMPLEXITY

Multi-path is a major impairment for mobile OFDM systems. Time variance of the mobile channel leads to a loss of sub-carrier orthogonality. In this paper, linear minimum mean square error estimator (LMMSEE) with superimposed periodic pilot for finite-impulse response (FIR) channel estimation is proposed. Theoretical analysis and computer simulation show that the proposed method are found to exhibit better performance and lower complexity than that of the LS method at SNR values of practical interest.