Modern communications system needs to be based upon (OFDM). The channel estimation can be appropriate to provide for analyzing effect of the channel on signal by either inserting pilot tones into all of the subcarriers of OFDM symbols with a specified period or inserting pilot tones into individual OFDM symbols. The block type pilot channel estimation develops for slow fading channels and comb type for fast fading. When the data transmits at high bit rates, the channel impulse response h (t) can extend over symbol periods, it leads to ISI. OFDM is committed as part of the appropriate factors to mitigate the ISI. This work improves various channels performance measures based on the comparison of various channel estimation algorithms and suggests a novel technique which provides better performance. This paper discusses the estimations of channels in OFDM and its implementations in MATLAB using a cyclic prefix and pilot based block type channel estimation techniques by linear square and minimum mean square estimator algorithms..