Title :
A noise whitening approach to multiple-access noise rejection .II. Implementation issues
Author :
Davis, Mark ; Monk, Anton ; Milstein, Laurence B.
Author_Institution :
COM-Solutions, Encinitas, CA, USA
fDate :
10/1/1996 12:00:00 AM
Abstract :
Several practical methods are proposed for the implementation of linear filters that reject multiple-access noise in direct sequence code-division multiple-access (DS-CDMA) receivers. These methods rely on taking advantage of variations in the received chip spectrum, and do not require locking and despreading multiple signals. The resulting structures are simple, and some can operate at a high chip rate. Adaptive structures are also proposed. It is shown that a close relationship exists between noise whitening and chip-equalization for a DS-CDMA receiver. System issues affecting the choice of the chip spectrum, and thus the applicability of these methods, are described
Keywords :
adaptive equalisers; adaptive filters; code division multiple access; correlators; filtering theory; interference suppression; noise; pseudonoise codes; radiofrequency interference; spectral analysis; spread spectrum communication; DS-CDMA receivers; adaptive equalization; adaptive filters; chip equalization; chip spectrum; direct sequence code-division multiple-access; high chip rate; linear filters; multiple-access noise rejection; noise whitening; received chip spectrum; transversal filter; Adaptive algorithm; Correlators; Helium; Multi-stage noise shaping; Multiaccess communication; Nonlinear filters; RAKE receivers; Signal to noise ratio; Spread spectrum communication; Transmitters;
Journal_Title :
Selected Areas in Communications, IEEE Journal on