Discrete wavelet transform based OFDM-IDMA system with AWGN channel

This paper presents a model which is Discrete Wavelet Transform based Orthogonal Frequency Division Multiplexing-Interleaver Division Multiple Access (OFDM-IDMA) system for next generation wireless communication system. With IDMA, interleavers are the only means of user separation. In Discrete Fourier Transform based OFDM-IDMA systems, signals only overlap in the frequency domain while the Wavelet Transform signals overlap both in the time and frequency domains, so there is no need for the cyclic prefix (CP) in the proposed model. Performance of the proposed model is experimented and compared for different BPSK, QPSK, 16 QAM channel with transmitter & receivers and observed better BER. Also compared for different wavelet families and found the suitable with Daubechie wavelet. The proposed model Comparisons with other alternative technologies such as DFT-OFDM-IDMA is provided. The proposed model is discussed for multi-user detection, flexible rate adaptation, frequency diversity, and significant advantages regarding spectral and power efficiency. This paper concludes with efficient performance of the system which can be considerable for next wireless communication system.