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WiMAX which represents Worldwide Interoperability for microwave access is a major part of broadband wireless network having IEEE 802.16 standard provides innovative fixed as well as mobile platform for broadband internet access anywhere in anytime. The objective of this paper is the comparative study of Stanford University Interim (SUI) fading channels in IEEE802.16d using different cyclic prefix to improving BER at different SNR under digital modulation techniques. The simulation is performed for fixed WiMAX and the performance measures that the authors presented in this paper are: the Bit Error Rate (BER) versus the ratio of bit energy to noise power spectral density (Eb/No).
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