Title :
Detection-aided recursive least squares adaptive multiuser detection in DS/CDMA
Author :
Thanh, Bui Ngoc ; Krishnamurthy, Vikram ; Evans, Robin J.
Author_Institution :
Dept. of Electr. & Electron. Eng., Melbourne Univ., Parkville, Vic., Australia
Abstract :
This letter develops a sequential composite hypotheses test for detecting failure of a decision-directed recursive least square (RLS) adaptive multiuser detector (MUD) and convergence of a blind RLS (BLRS) MUD when used in the downlink of direct-sequence/code division multiple access (DS/CDMA) systems. Simulations are provided to demonstrate the effectiveness of the test and to characterize the SIR improvement achievable in a dynamic environment where the number of interferers is time-varying.
Keywords :
adaptive signal detection; code division multiple access; least squares approximations; receivers; spread spectrum communication; BLRS MUD; DS/CDMA; SIR improvement; blind RLS MUD; convergence; decision-directed RLS MUD; decision-directed recursive least square adaptive multiuser detector; detection-aided recursive least squares adaptive multiuser detection; direct-sequence/code division multiple access systems; downlink; dynamic environment; failure; sequential composite hypotheses test; time-varying interferers; Convergence; Covariance matrix; Detectors; Distributed decision making; Least squares methods; Multiaccess communication; Multiuser detection; Resonance light scattering; Sequential analysis; Testing;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2002.803012
