Title :
Effects of imperfect blind channel estimation on performance of linear CDMA receivers
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Riverside, CA, USA
Abstract :
In a code division multiple access (CDMA) system, signal detection under multipath distortion typically requires estimation of unknown channel parameters first. In such a scenario, performance of receivers highly relies on the accuracy of channel estimates. In this paper, effects of channel estimation errors on the performance of linear CDMA receivers due to finite data samples are studied when channel parameters are estimated blindly by a recently proposed covariance-matching technique. Those receivers include zero-forcing (ZF), direct matrix-inversion (DMI) minimum mean-square-error (MMSE), subspace MMSE, and RAKE receivers. Their output signal-to-interference-plus-noise ratios (SINRs) and bit-error-rates (BERs) are adopted for performance measures. Expressions for performance indicators under such an imperfect condition are derived from a perturbation perspective and verified by simulation examples.
Keywords :
channel estimation; code division multiple access; covariance analysis; error statistics; least mean squares methods; matrix inversion; multipath channels; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; RAKE receivers; bit-error-rates; channel estimation error; code division multiple access system; covariance-matching technique; direct matrix-inversion; finite data samples; imperfect blind channel estimation; linear CDMA receivers; minimum mean-square-error; multipath distortion; signal detection; signal-to-interference-plus-noise ratio; subspace MMSE; Blind equalizers; Channel estimation; Covariance matrix; Distortion; Fading; Multiaccess communication; Multipath channels; Parameter estimation; RAKE receivers; Signal detection; Code-division multiple access; covariance matching; multiuser detection; perturbation analysis;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2004.834408
