Title :
Blind equalization in antenna array CDMA systems
Author :
Liu, Hui ; Zoltowski, Michael D.
Author_Institution :
Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA
fDate :
1/1/1997 12:00:00 AM
Abstract :
Multipath induced interchip-interference (ICI) alters waveforms of transmitted signals and presents a major obstacle to direct-sequence (DS) code-division-multiple-access (CDMA) communications. For systems with aperiodic pseudorandom (PN) spreading sequences, the primary way to counter fading is through employing RAKE receivers that enhance the signal-to-interference ratio (SIR) by combining multipath signals from the desired user. In this paper, we formulate a discrete-time model for antenna array CDMA systems and study the 2-D RAKE receiver problem by casting it into an optimum vector FIR equalizer design and estimation framework. A novel aspect of the present work is the full exploitation of the potential of 2-D RAKE receivers without requiring any detailed knowledge of the multipath channels
Keywords :
FIR filters; antenna arrays; array signal processing; code division multiple access; discrete time filters; equalisers; fading; multipath channels; pseudonoise codes; radio receivers; spread spectrum communication; 2D RAKE receiver problem; DS-CDMA communication; PN spreading sequences; antenna array; aperiodic pseudorandom spreading sequences; blind equalization; direct-sequence code-division-multiple-access; discrete-time model; estimation framework; fading; multipath channels; multipath induced interchip-interference; multipath signals; optimum vector FIR equalizer design; signal-to-interference ratio; Antenna arrays; Array signal processing; Blind equalizers; Diversity reception; Fading; Finite impulse response filter; Interference; Multiaccess communication; Multipath channels; Receiving antennas;
Journal_Title :
Signal Processing, IEEE Transactions on
