The first stage is the image segmentation, where the transmitted image is segmented into packets the tested packet lengths are 1, 2, 4, 8, 16 Kbits. The results are evaluated in terms of Bit Error Rate, and Peak Signal to Noise Ratio for various values of Signal to Noise Ratio. The objective is determining the optimum technique in every transmission stage that can be used for obtaining the optimum performance of the image transmission process. This paper studies the performance of image transmission over WiMAX networks under different fading channels. From the analysis it was observed that all the digital modulation schemes with cyclic prefix or guard time of 1/32 provides resistant to inters symbol interference (ISI) thereby improving BER performance with limited SNR. The performance was also extended for different digital modulation schemes. In this paper we have analyzed Bit Error Rate (BER) performance of the WiMAX Physical layer baseband conforming to the parameters established by IEEE 802.16 standards under different Guard time intervals between OFDM symbols. Orthogonal Frequency Division Multiplexing (OFDM) based WiMAX (Worldwide Interoperability for Microwave Access) is the outcome in this direction which promises to solve the last mile access technology to provide high speed internet access in the residential as well as small and medium sized enterprise sectors. To satisfy the user requirements and to overcome the limitations of existing wireless technologies, have led the researchers to come up with more advanced and efficient technology. The demand of mobile Internet and wireless multimedia applications are growing faster than ever.
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