PERFORMANCE ENHANCEMENT OF IEEE 802.16E (MOBILE WI-MAX) SYSTEM WITH ADAPTIVE MODULATION AND CODING TECHNIQUES

WI-MAX is an efficient technology which offers high speed voice, video and data services based on OFDM based adaptive physical layer. WI-MAX is introduced by the institute of electrical and electronics engineers (IEEE) which is used in fixed and mobile wireless applications. This standard only deals with MAC and PHY layer specification of network architecture. This research has already been done on performance analysis of physical layer of WI-MAX system with the help of different modulation techniques such as BPSK, QPSK and QAM. In this thesis work, the performance of WI-MAX system has been analyzed with the help of BPSK, QPSK, QAM-8, QAM-16, QAM-64, QAM-256 and an adaptive modulation and coding scheme (AMC) modulation techniques to find out the best performance of physical layer for 802.16e WI-MAX. The MATLAB simulation has been observed based on performance of different modulation techniques using Bit Error Rate (BER), Signal to Noise Ration (SNR) and Spectral Efficiency as performance parameters. This research proposes that the higher modulation coding techniques such as QAM-256 provides better performance with highest SNR near the base station but as range increases, the lower modulation coding techniques such as BPSK can be adjusted to perform better with lowest SNR using Adaptive modulation coding.