Title :
Performance analysis of an adaptive decision-feedback receiver in asynchronous CDMA systems
Author :
Liu, Yong ; Wong, Tan F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
The performance of several linear multiuser receivers including the matched filter receiver, the decorrelator receiver, and the MMSE receiver has been analyzed in CDMA systems with random sequences. Little work has been done for nonlinear decision feedback receivers. In this paper, we extend the results for linear multiuser receivers to an asynchronous CDMA system with an adaptive decision-feedback detector (DFD). The performance of the DFD using both deterministic sequences and random sequences is analyzed. With the assumption of perfect feedback (i.e., the receiver always makes correct decisions), the feedback part of the adaptive DFD can suppress the interference due to the previous symbols of all users completely and correspondingly the user capacity of the whole system increases greatly when compared with a system using an MMSE receiver.
Keywords :
adaptive systems; cellular radio; code division multiple access; feedback; interference suppression; multiuser channels; radio receivers; radiofrequency interference; sequences; signal detection; spread spectrum communication; AWGN channel; MMSE receiver; adaptive decision-feedback detector; adaptive decision-feedback receiver; additive white Gaussian noise channel; asynchronous CDMA systems; decorrelator receiver; deterministic sequences; interference suppression; linear multiuser receivers; matched filter receiver; multiuser detection; nonlinear decision feedback receiver; perfect feedback; performance analysis; random sequences; single-cell DS-CDMA system; user capacity; Adaptive systems; Decorrelation; Design for disassembly; Detectors; Feedback; Interference suppression; Matched filters; Multiaccess communication; Performance analysis; Random sequences;
Conference_Titel :
Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE
Print_ISBN :
0-7803-7376-6
DOI :
10.1109/WCNC.2002.993324
