Title :
Direct-sequence spread-spectrum parallel acquisition in nonselective and frequency-selective Rician fading channels
Author :
Sourour, Essam ; Gupta, Someshwar C.
Author_Institution :
Alexandria Univ., Egypt
fDate :
4/1/1992 12:00:00 AM
Abstract :
This work presents the performance of the direct-sequence spread-spectrum (DS-SS) parallel acquisition system, previously proposed by the authors (1989, 1990), for nonselective and frequency-selective Rician (i.e. specular plus Rayleigh) fading channels. The acquisition system utilizes a bank of parallel I-Q noncoherent matched filters for the search mode, and a coincidence detector for the verification mode. The probabilities of detection and false alarm are derived and the mean and variance of the acquisition time are evaluated as a measure of the system performance. The nonselective channel is a Rayleigh fast fading channel, while the frequency-selective channel model is the so-called wide sense stationary uncorrelated scattering (WSSUS), selective only on frequency. These channels are typical for aircraft-satellite and line-of-sight (LOS) communications
Keywords :
electromagnetic wave scattering; fading; matched filters; radiowave propagation; spread spectrum communication; telecommunication channels; DS-SS; I-Q noncoherent matched filters; LOS communication; Rayleigh fast fading channel; acquisition time; aircraft-satellite communications; coincidence detector; detection probability; direct-sequence spread-spectrum; false alarm probability; frequency-selective Rician fading channels; line of sight communications; mean; nonselective Rician fading; nonselective channel; parallel acquisition system; search mode; system performance; variance; verification mode; wide sense stationary uncorrelated scattering; Aircraft; Artificial satellites; Detectors; Fading; Frequency; Matched filters; Rician channels; Spread spectrum communication; System performance; Time measurement;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
