International Journal of Advanced Research in Computer Engineering & Technology
To increase the performance of the advance wireless system, the channel estimation is an important technology in time-varying channel. For that the different modulation technique is used in OFDM, such as BPSK, QPSK, 16 QAM, and 64 QAM and for the estimation at the receiver the LS (Least Square) method and LMMSE (Linear Minimum Mean Square Error) method is used. The LS and LMMSE technique is used at receiver the estimation is done by using the pilot sequences. The major advantage of the pilot sequences it allows high accuracy in wireless channel with simplicity.