Title :
The issue of spreading in multipath time-varying channels
Author :
Médard, Muriel ; Gallager, Robert G.
Author_Institution :
Lab. for Inf. & Decision Syst., MIT, Cambridge, MA, USA
Abstract :
The capacity of a multiple-access, time-varying but known multipath channel is considered in the presence of white Gaussian noise, a bandwidth constraint, and power constraints. It is assumed that the product of the time spread and the Doppler spread is small. The general case is specialized to particular cases such as flat fading and specular paths with fixed Doppler shifts. The results provide insight into questions of CDMA and orthogonal systems
Keywords :
Doppler effect; Doppler shift; Gaussian channels; channel capacity; code division multiple access; fading; mobile communication; multipath channels; radiowave propagation; spread spectrum communication; time-varying channels; CDMA; Doppler spread; bandwidth constraint; channel capacity; fixed Doppler shifts; flat fading; mobile communications; multipath time-varying channels; multiple-access system; orthogonal systems; power constraints; radio propagation; specular paths; spreading; time spread; white Gaussian noise; Bandwidth; Baseband; Fading; Frequency; Interference; Laboratories; Mobile communication; Multipath channels; Time varying systems; Time-varying channels;
Conference_Titel :
Vehicular Technology Conference, 1995 IEEE 45th
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-2742-X
DOI :
10.1109/VETEC.1995.504817
