Discrete wavelet packet based multitone modulation for transmitting complex symbols

Multicarrier modulation (MCM) methods have been attracting considerable attention lately. In this paper, we address MCM techniques based on wavelet packets for QAM (quadrature amplitude modulation) and PM (phase modulation) symbol constellations. We first discuss the design of complex wavelet packets, which serve as orthonormal carriers for MCM, and then describe a DWMT (discrete wavelet multitone) scheme for transmitting QAM and PM symbols. We consider both blind and non-blind schemes for retrieving the symbols at the receiver. Simulations have been carried out to study the performance with both the schemes.