Performance Evaluation of Adaptive Modulation Techniques of WiMAX System with Optimized Cyclic Prefix

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Maninder Singh
Kiran Ahuja


Orthogonal frequency division multiple access uses adaptive modulation technique on the physical layer of WiMAX and it uses the
concept of cyclic prefix that adds additional bits at the transmitter end. The signal is transmitted through the channel and it is received at the
receiver end. Then the receiver removes these additional bits in order to minimize the inter symbol interference, to improve the bit error rate and
to reduce the power spectrum. In this paper, we have investigated the physical layer performance on the basis of bit error rate vs. signal to noise
ratio by varying cyclic prefix of adaptive modulation techniques (BPSK, QPSK, 16-QAM and 64-QAM). These parameters are discussed with
two different channel Models (AWGN Channel model and Rayleigh Channel model). The BER curves were used to compare the performance of
different modulation techniques with optimized cyclic prefix. BPSK modulation technique under different channels provides satisfactory
performance among the four considered modulation techniques.



Keywords : Adaptive Modulation techniques, IEEE-802. 16, OFDMA


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