Title :
Reduced-rank interference suppression for DS-CDMA based on interpolated FIR filters
Author :
De Lamare, Rodrigo C. ; Sampaio-Neto, Raimundo
Author_Institution :
CETUC/PUC-RIO, Rio de Janeiro, Brazil
fDate :
3/1/2005 12:00:00 AM
Abstract :
Reduced-rank receivers based on interpolated finite impulse response (FIR) filters for direct sequence code division multiple access (DS-CDMA) systems are proposed and a novel scheme where the interpolator is rendered time-varying is introduced. The interpolated minimum mean squared error (MMSE) and constrained minimum variance (CMV) solutions are derived for both receiver and interpolator to mitigate multiple access interference (MAI) and intersymbol interference (ISI) in a downlink scenario.
Keywords :
FIR filters; cochannel interference; code division multiple access; interference suppression; interpolation; intersymbol interference; least mean squares methods; spread spectrum communication; CMV; DS-CDMA systems; ISI; MAI; MMSE; constrained minimum variance; direct sequence code division multiple access; finite impulse response; interference suppression; interpolated FIR filters; intersymbol interference; minimum mean squared error; multiple access interference; reduced-rank receivers; time-varying interpolator; Digital filters; Downlink; Filtering; Finite impulse response filter; Interference suppression; Intersymbol interference; Matched filters; Multiaccess communication; Multiple access interference; Parameter estimation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.03010
