Title :
Impact of imperfect channel estimation on turbo multiuser detection in DS-CDMA systems
Author :
Li, Husheng ; Poor, H. Vincent
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ, USA
Abstract :
In practical wireless communications, channel estimation is imperfect due to the effects of noise and interference. This paper analyzes the impact of imperfect channel estimation on a form of turbo multiuser detection based on linear minimum-mean-square-error (MMSE) detection and parallel interference cancellation. In particular, the variance of the noise caused by the channel estimation error is analyzed for full and reduced rank MMSE detectors and parallel interference cancellation in the large system limit.
Keywords :
channel estimation; code division multiple access; covariance matrices; eigenstructure assignment; error detection codes; filtering theory; interference suppression; iterative methods; least mean squares methods; multiuser detection; parallel algorithms; radiofrequency interference; spread spectrum communication; turbo codes; DS-CDMA systems; covariance matrix; eigenvalues distribution; frequency selective channels; imperfect channel estimation; iterative methods; minimum-mean-square-error detection; minimum-mean-square-error filtering; parallel interference cancellation; turbo multiuser detection; wireless communications; Analysis of variance; Channel estimation; Detectors; Error analysis; Interference cancellation; Multiaccess communication; Multiuser detection; Noise cancellation; Noise reduction; Wireless communication;
Conference_Titel :
Wireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
Print_ISBN :
0-7803-8344-3
DOI :
10.1109/WCNC.2004.1311513
