Title :
Channel equalization in DS-CDMA downlink communications
Author :
Li, Kemin ; Liu, Hui
Author_Institution :
Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA
Abstract :
A linear receiver is proposed for downlink DS-CDMA communications over unknown frequency-selective fading channels. The new receiver exploits the fact that all synchronized orthogonal CDMA signals go through the same channel to recover the desired signal with a constrained channel equalizer followed by a despreader. Such a scheme allows the receiver to operate blindly in a time varying environment for both periodic CDMA and aperiodic CDMA systems.
Keywords :
adaptive equalisers; code division multiple access; fading channels; land mobile radio; multiuser channels; radio links; radio receivers; spread spectrum communication; synchronisation; DS-CDMA downlink communications; FIR channels; aperiodic CDMA systems; blind equalizer; channel equalization; constrained channel equalizer; despreader; frequency-selective fading channels; linear receiver; periodic CDMA systems; signal recovery; synchronized orthogonal CDMA signals; time varying environment; Data models; Downlink; Equalizers; Fading; Finite impulse response filter; Frequency synchronization; Multiaccess communication; Multiple access interference; RAKE receivers; Time varying systems;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.832300
