Performance Analysis Of Cyclic Prefix OFDM Using Adaptive Modulation Techniques

A Orthogonal Frequency Division Multiplexing (OFDM) scheme provides high spectral efficiency and better resistance to fading environments. In OFDM the data is modulated using multiple number of sub-carriers that are orthogonal to each other. The Inter Symbol Interference (ISI) and Inter Channel/Carrier Interference (ICI) are reduced to a great extent with use of OFDM. A guard time, in the form of Cyclic Prefix (CP) is inserted between OFDM symbols to eliminate both the lSI and ICI. In this article, OFDM based BPSK, QPSK and QAM modulation systems are demonstrated incorporating AWGN channels using MATLAB Simulink model. The performance of the system is evaluated in terms of BER. The effect of the CP on the BER is also evaluated for BPSK, 4-QAM, 16-QAM, and 64-QAM modulation schemes.

Related Organizations

National Institute of Technology
Indonesia

Keywords

QAM;, QPSK;, WIMAX, BER;, SNR;, BPSK;, OFDM;, Cyclic Prefix;

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