Performance Evaluation of MMSE and LS Channel Estimation in OFDM System
Since from last two decade Orthogonal Frequency Division Multiplexing (OFDM) got lots interest in mobile communication systems. In OFDM system, the radio channels which the people use are frequency selective and vary with time for wireless wideband mobile communication system. The transfer function of these radio channels is unequal in time as well as in frequency domain, due to which a dynamic estimation of these channels should required at the demodulation point of OFDM. In this paper, the authors use Pilotaided Least Square (LS) and Minimum Mean-Square Error (MMSE) estimator for estimating the channel of OFDM system with different modulation techniques i.e. 16-PSK, 4-QAM, 8-QAM and 16-QAM.