Novel Cyclic Prefix Selection to Improve Spectral Efficiency and Signal Strength in OFDM Systems

The primary objective of using a guard interval in form of Cyclic Prefix (CP) for WiMAX has always been to mitigate the adverse effect of Inter Symbol Interference (ISI) due to multipath fading. However, recent researches on Adaptive Cyclic Prefix (ACP) have been suggested instead of the existing fixed CP duration for changing Channel SNR. These strategies provide a better Quality of Service (QoS) and also enhances the performance of OFDM based WiMAX systems. Based on these strategies, an “error on the fly” correction based ACP has been proposed in this paper. The proposed method, accompanied by exhaustive simulation results, show its effectiveness by the improved Spectral Efficiency (SE) and better Signal strength for a typical WiMAX scenario under fast fading multipath channel conditions. Keywords-Data Rate; Spectral Efficiency; Adaptive Cyclic Prefix

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