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The WIMAX technology based on air interface standard 802.16 wireless MAN isconfigured in the same way as a traditional cellular network with base stationsusing point to multipoint architecture to drive a service over a radius up toseveral kilometers. The range and the Non Line of Sight (NLOS) ability of WIMAXmake the system very attractive for users, but there will be slightly higherBER at low SNR. The aim of this paper is the comparative study of differentguard time intervals effect for improving BER at different SNR under digitalmodulation (QPSK, 16QAM and 64QAM) techniques and different communicationchannels AWGN and fading channels Stanford University Interim (SUI 1) of anWIMAX system. The comparison between these effects with Reed-Solomon (RS)encoder with Convolutional encoder (half) rated codes in FEC channel codingwill be investigated. The simulation results of estimated Bit Error Rate (BER)displays that the implementation of interleaved RS code (255,239,8) with (half)rated Convolutional code of 0.25 guard time intervals under QPSK modulationtechnique over AWGN channel is highly effective to combat in the Wimaxcommunication system. To complete this performance analysis in Wimax basedsystems, a segment of audio signal is used for analysis. The transmitted audiomessage is found to have retrieved effectively under noisy situation.

Comparative Study of Different Guard Time Intervals to Improve the BER  Performance of Wimax Systems to Minimize the Effects of ISI and ICI under  Adaptive Modulation Techniques over SUI1 and AWGN Communication Channels