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In wireless-domain, performance evaluation of preamble detection under varying channel conditions is of compelling research interest nowadays. Most of the existing works, based on preamble detection under channel conditions are limited to ITU, AWGN etc in Mobile WiMAX. In this paper, the authors have performed preamble detection for 1024 point FFT and 512 point FFT data under SUI channel models in addition to ITU - R Vehicular A and Pedestrian B models. The results show that the performance of 1024 FFT is better than 512 FFT under various channel models. Moreover, they analyzed the behavior of various channels for these two different bandwidths.
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