Performance Analysis of Adaptive MIMO Based OFDM using FFT and DWT

Abstract

In this paper we examine the performance of Discrete Wavelet Transform (DWT) based Multiple Input Multiple output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system using adaptive modulation and compare with DWT based MIMO OFDM system and Fast Fourier Transform (FFT) based MIMO OFDM system. Wavelet based OFDM has lot of advantages compare to the FFT based OFDM like there is no need of cyclic prefix, flexibility and optimal resolution. DWT with Haar mother constructed multi carrier in addition to the predictable OFDM is less than the consequence of taking multiple antennas scheme while taking BPSK and QPSK as dual modulation schemes in additive white Gaussian noise channel (AWGN). Based on the performance of bit error rate to the signal to noise ratio, the DWT constructed multicarrier scheme was established to be higher than the predictable OFDM. While using adaptive modulation in DWT based MIMO OFDM system with BPSK results in higher BER performance than DWT based MIMO OFDM system