Title :
Characterization of wideband time-varying channels with multipath-scale diversity
Author :
Jiang, Ye ; Papandreou-Suppappola, Antonia
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
fDate :
28 Sept.-1 Oct. 2003
Abstract :
In this paper, we present a characterization of wideband time-varying wireless channels based on a discrete time-scale framework that can provide multipath-scale diversity. This is important for systems such as underwater or airborne acoustics for which the narrowband conditions no longer hold, and time-scalings cannot be approximated by constant frequency shifts. We design a spreading waveform for direct-sequence code division multiple-access systems based on wavelet functions to realize orthogonal signaling. Furthermore, we use the orthogonal wavelet decomposition for direct channel estimation and coherent detection.
Keywords :
channel estimation; code division multiple access; diversity reception; signal detection; spread spectrum communication; telecommunication signalling; time-varying channels; wavelet transforms; airborne acoustics; coherent detection; direct channel estimation; direct-sequence code division multiple-access system; discrete time-scale framework; multipath-scale diversity; orthogonal signaling; orthogonal wavelet decomposition; spreading waveform; underwater system; wavelet function; wideband time-varying channels; wireless channels; Acoustic applications; Acoustic propagation; Channel estimation; Frequency; Multiaccess communication; Narrowband; Signal design; Time-varying channels; Underwater acoustics; Wideband;
Conference_Titel :
Statistical Signal Processing, 2003 IEEE Workshop on
Print_ISBN :
0-7803-7997-7
DOI :
10.1109/SSP.2003.1289337
