Simulation of 16 QAM OFDM Modulator Using MATLAB

Abstract

In this paper the 16 QAM (M=16) Modulator is simulated for OFDM using MATLAB tools. In 16QAM, BER performance is better than 64 QAM [2], [3]. OFDM (Orthogonal Frequency Division Multiplexing) is technology that will  certainly play a vital role in next generation wireless communication systems [1].To improve BER performance  in OFDM, no frequency diversity is changed. The Orthogonality is shown by the OFDM carriers on a symbol interval if they are spaced in frequency exactly at the reciprocal of the symbol interval, which can be done by utilizing the discrete Fourier transform(DFT)[2].This is acceptable  in the presence of fading environment and for high data rate application. Orthogonality of signals is the basic key behind its usage which reduces the interference to a large extent. For direct and quadrature component Filtered and unfiltered scatter plot are generated.