DocumentCode :
401293
Title :
A common framework for blind multistage multiuser receivers of DS-CDMA in frequency-selective fading channels
Author :
Wu, Sau-Hsuan ; Mitra, Urbashi ; Kuo, C. C Jay
Author_Institution :
Dept. of Electr. Eng., Southern California Univ., Los Angeles, CA, USA
Volume :
5
fYear :
2003
fDate :
1-5 Dec. 2003
Firstpage :
2468
Abstract :
The multistage (MS) Wiener filter proposed in J.S. Goldstein et al. (1998) is extended to blind maximum likelihood (ML) multiuser detection for direct-sequence (DS) code-division multiple access (CDMA) systems. This multistage ML detector is shown to share the same structure with the MS minimum-mean squared error (MMSE), minimum output energy (MOE) and best linear unbiased estimator (BLUE) filter banks (FBs) derived in S.-H. Wu et al. (2002) and S.-H. Wu et al. (2003), each with a distinctive output scaling matrix. Based on this result, a common framework is proposed for the implementation and analysis of coherent maximum ratio combining (MRC) and non-coherent differential equal gain combining (EGC) of these receivers. A generic bit error rate (BER) formula is provided for receivers constructed within this common framework. The BER floors for EGC receivers are analyzed and compared to those of the MRC schemes presented in S.-H. Wu et al. (2003). Based on simulation results, the heterogeneous EGC BLUE-ML receiver exhibits the best performance due to the fact that BLUE-FB is essentially the ML channel estimator and ML-FB is the ML symbol detector for the linear Gaussian system models of DS-CDMA systems.
Keywords :
Gaussian channels; Wiener filters; channel estimation; code division multiple access; error statistics; fading channels; least mean squares methods; maximum likelihood detection; multiuser channels; radio receivers; spread spectrum communication; BER; DS-CDMA; Wiener filter; best linear unbiased estimator filter bank; bit error rate; blind maximum likelihood multiuser detection; blind multistage multiuser receiver; channel estimation; direct-sequence code-division multiple access; equal gain combining; frequency-selective fading channel; linear Gaussian system; maximum ratio combining; minimum output energy method; minimum-mean squared error method; Bit error rate; Detectors; Diversity reception; Filter bank; Frequency-selective fading channels; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Multiuser detection; Wiener filter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
Print_ISBN :
0-7803-7974-8
Type :
conf
DOI :
10.1109/GLOCOM.2003.1258680
Filename :
1258680
Link To Document :
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