Title :
Performance of CDMA receivers under imperfect channel estimation
Author_Institution :
Dept. of Electr. Eng., California Univ., Riverside, CA, USA
Abstract :
In a CDMA system, imperfect channel estimation causes performance degradation of a minimum mean-square-error (MMSE) receiver. This paper studies the effects of channel estimation error on the performance of a direct matrix inversion (DMI) MMSE receiver and subspace MMSE receiver when channel parameters are estimated by a covariance-matching technique based on finite data samples. The receivers´ output signal-to-interference-plus-noise ratios (SINRs) and bit-error-rates (BERs) are adopted for performance measures. Those 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; error statistics; least mean squares methods; matrix inversion; radio receivers; radiofrequency interference; BER; CDMA receivers; MMSE receiver; SINR; bit-error-rate; covariance-matching technique; direct matrix inversion receiver; imperfect channel estimation; minimum mean-square-error receiver; multiuser interference; perturbation; signal-to-interference-plus-noise ratio; subspace receiver; wireless communication; Channel estimation; Covariance matrix; Degradation; Interference; Matrix decomposition; Multiaccess communication; Noise measurement; Performance analysis; Signal to noise ratio; Statistics;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
Print_ISBN :
0-7803-8484-9
DOI :
10.1109/ICASSP.2004.1326990
