Abstract: A novel Discrete Wavelet Packet Modulation(DWPM) system based on Fractionally Spaced Equalizers(FSE) and the Maximum Likelihood (ML) algorithm is studied for multipath fading channels. The proposed FSE based on the least mean square (LMS) algorithm can mitigate the detrimental effects of the inter-symbol interference (ISI) caused by the multipath fading channel. The demodulated symbols are detected by the maximum likelihood (ML) algorithm. The transmission performance is analyzed in the multipath fading channel and the Additive Gaussian White Noise (AWGN). Simulation results show that the proposed DWPM scheme can provide greater immunity to multipath fading channels and AWGN than the traditional orthogonal frequency division multiplexing (OFDM) scheme.

Key words: DWPM, fractionally spaced equlizers, maximum likelihood algorithm, multipath fading channels, LMS algorithm