Channel Estimation Algorithms in OFDM, A Review

Main objectives of this paper is to review the work already done related to channel estimation in OFDM (Orthogonal Frequency Division Multiplexing) using QAM (Quadrature Amplitude multiplexing) & PSK (Phase Shift Keying) modulation techniques used in OFDM for wireless communications. To estimate the channels three algorithms are used i.e. LS, LMMSE & Modified MMSE. These three algorithms have basically played key role in channel estimation.