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Scalelag diversity reception in mobile wideband channels
 Proc. IEEE Internat. Conf. on Acoustics, Speech, and Signal Processing
, 2005
"... We consider the effect of mobility on a wideband direct sequence spread spectrum (DSSS) communication system, and study a scalelag Rake receiver capable of leveraging the diversity that results from mobility. A wideband signal has a large bandwidthtocenter frequency ratio, such that the typical na ..."
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We consider the effect of mobility on a wideband direct sequence spread spectrum (DSSS) communication system, and study a scalelag Rake receiver capable of leveraging the diversity that results from mobility. A wideband signal has a large bandwidthtocenter frequency ratio, such that the typical narrowband Doppler spread assumptions do not apply to mobile channels. Instead, we assume a more general temporal scaling phenomenon, i.e., a dilation of the transmitted signal's time support. Such analysis applies, for example, to ultrawideband (UWB) radio frequency channels and underwater wideband acoustic channels. 1.
Affine Group Linear Operatorbased Channel Characterization for Mobile Radio Systems
"... Abstract: Mobile radio channel characterization using linear operators of affine group is presented. The foundation of this approach is primarily based on the natural extension of basic concepts of timescale representations of wavelettype to the analysis and representation of the nonstationarity ..."
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Abstract: Mobile radio channel characterization using linear operators of affine group is presented. The foundation of this approach is primarily based on the natural extension of basic concepts of timescale representations of wavelettype to the analysis and representation of the nonstationarity associated with the realtime mobile radio channel. We provide an operatorbased characterization initiated by the need to present an intuitive and physical approach towards describing and representing the various effects of the channel. The concepts of delayscale spreading function and operator as well as delayscale scattering function and operator is introduced. We established the relationship between the continuous wavelet transform and these functions/operators by employing the powerful tool of group theory. We also derived canonical expression for the corresponding channel by discretizing the channel using frame concept. The practical relevance of our approach is illustrated via deterministic examples and the associated simulations. KeyWords: Channel characterization, mobile radio channel, nonstationary channel, timefrequency operator,