Title :
Wavelet packet modulation for orthogonally multiplexed communication
Author_Institution :
Radio Commun. Branch, Rome Lab., NY
fDate :
5/1/1997 12:00:00 AM
Abstract :
Utilizing multidimensional signaling techniques, a generalized multirate wavelet-based modulation format for orthogonally multiplexed communication systems is presented. Wavelet packet modulation (WPM) employs the basis functions from an arbitrary pruning of a dyadic tree structured filter bank as orthogonal pulse shapes for conventional quadrature amplitude modulation (QAM) symbols. This generalized framework affords an entire library of basis sets with increased flexibility in time-frequency (T-F) partitioning. The bandwidth efficiency and power spectral density figures of merit for the general signal are derived and shown to be that of standard QAM
Keywords :
band-pass filters; filtering theory; multiplexing; quadrature amplitude modulation; telecommunication signalling; time-frequency analysis; wavelet transforms; QAM; arbitrary pruning; bandwidth efficiency; basis functions; dyadic tree structured filter bank; generalized multirate wavelet-based modulation; multidimensional signaling techniques; orthogonal pulse shapes; orthogonally multiplexed communication; power spectral density; quadrature amplitude modulation; time-frequency partitioning; wavelet packet modulation; Amplitude modulation; Filter bank; Libraries; Multidimensional systems; Pulse modulation; Pulse shaping methods; Quadrature amplitude modulation; Shape; Time frequency analysis; Wavelet packets;
Journal_Title :
Signal Processing, IEEE Transactions on
