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The paper presents an investigation into methods for maximizing the spectral Efficiency of Orthogonal Frequency Division Multiplexing (OFDM) systems. As part of this, an investigation of detrimental effects on OFDM is presented, the use of pilots between carriers, Clipping Distortion, Additive Complex Noise (ACN) on modulation QPSK rate, on multi path Synchronization error, using estimation results. Estimation is performed using the known pilot's symbols and impulse response of pilots symbols at receiver which is used to find the impulse response of the channel by using linear interpolation. Estimation result will be applied to Zero Forcing algorithms which reduces the multipath effect. Impulse response of channel helps to find out the number of path of each symbol and reduces the Bit error rate of output response. Finally the received signal has passed through Euclidean algorithm which also reduce the Bit Error Rate.