Title :
Subspace-based blind adaptive multiuser detection for multirate DS/CDMA signals
Author :
Huang, L. ; Zheng, F.-C. ; Faulkner, M.
Author_Institution :
Sch. of Commun. & Informatics, Victoria Univ. of Technol., Melbourne, Vic., Australia
fDate :
6/23/1905 12:00:00 AM
Abstract :
The existing dual-rate blind linear detectors, which operate at either the low-rate (LR) or the high-rate (HR) mode, are not strictly blind at the HR mode and lack theoretical analysis. This paper proposes the subspace-based LR and HR blind linear detectors, i.e., bad decorrelating detectors (BDD) and blind MMSE detectors (BMMSED), for synchronous DS/CDMA systems. To detect an LR data bit at the HR mode, an effective weighting strategy is proposed. The theoretical analyses on the performance of the proposed detectors are carried out. It has been proved that the bit-error-rate of the LR-BDD is superior to that of the HR-BDD and the near-far resistance of the LR blind linear detectors outperforms that of its HR counterparts. The extension to asynchronous systems is also described. Simulation results show that the adaptive dual-rate BMMSED outperform the corresponding non-blind dual-rate decorrelators proposed by Saquib, Yates and Mandayam (see Wireless Personal Communications, vol. 9, p.197-216, 1998)
Keywords :
adaptive signal detection; code division multiple access; decorrelation; error statistics; land mobile radio; multiuser channels; spread spectrum communication; 3rd-generation wireless communications systems; BER; adaptive dual-rate blind MMSE detectors; bit error rate; blind decorrelating detectors; dual-rate blind linear detectors; high-rate mode; low-rate data bit detection; low-rate mode; multirate DS/CDMA signals; near-far resistance; nonblind dual-rate decorrelators; simulation results; subspace-based blind adaptive multiuser detection; subspace-based blind linear detectors; synchronous DS/CDMA systems; weighting strategy; AWGN; Adaptive signal detection; Additive white noise; Binary decision diagrams; Covariance matrix; Decorrelation; Detectors; Gaussian noise; Multiaccess communication; Wireless communication;
Conference_Titel :
Statistical Signal Processing, 2001. Proceedings of the 11th IEEE Signal Processing Workshop on
Print_ISBN :
0-7803-7011-2
DOI :
10.1109/SSP.2001.955233