DefinePK

Abstract

Orthogonal frequency division multiplexing (OFDM) is a popular modulation technique that is widely utilized in many wireless communication systems. Traditional OFDM based on fast Fourier transform (FFT) involves the use of a rectangular window; consequently, high side lobes are created. Hence, OFDM based on discrete multiwavelet critical sampling transform (DMWTCS) is proposed in this paper. DMWTCS is more flexible in terms of data rate and has much lower side lobes than OFDM based on FFT. Given that the multiwavelet can overlap both in time and frequency domains and eliminates the need for a cyclic prefix, OFDM based on DMWTCS has higher bandwidth efficiency than OFDM based on FFT. In this paper, the performance of OFDM based on DMWTCS is compared with that of traditional OFDM based on FFT and OFDM based on discrete wavelet transform (DWT) through the use of various quadrature amplitude modulation (QAM) constellation points, such as 4-QAM, 8-QAM, and 16-QAM. These systems are examined in additive white Gaussian noise (AWGN), flat fading, and frequency-selective fading channels through MATLAB software. Simulation results reveal that the performance of the proposed system is better than that of the other two systems in all types of channels.