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Proceedings Paper

Large system analysis of blind multiuser detection in CDMA networks
Author(s): Junshan Zhang; Xiaodong Wang
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Paper Abstract

We consider wideband CDMA networks with many users, and study the system performance when blind linear multiuser receivers are employed for demodulation. We first characterize the signal-to-interference-plus-noise ratio (SINR) for blind multiuser receivers. Our results reveal that the SIR of these blind receivers saturates when the power of the desired user increases, which is in stark contrast to the fact that the SIR achieved by the exact MMSE receiver can get arbitrarily large. This saturation phenomenon of SINR indicates that the capacity of a wireless network with blind multiuser receivers is not only interference-limited, but also estimation-error limited. Furthermore, the effect of estimation error can be quantified. We then show that the residual interference at the output of these blind receivers is asymptotically Gaussian. The Gaussianity enables easy characterization of bit error probability. A parallel result is that the estimation error of the receiver is asymptotically orthogonal to the signal space.

Paper Details

Date Published: 27 July 2001
PDF: 12 pages
Proc. SPIE 4531, Modeling and Design of Wireless Networks, (27 July 2001); doi: 10.1117/12.434451
Show Author Affiliations
Junshan Zhang, Arizona State Univ. (United States)
Xiaodong Wang, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 4531:
Modeling and Design of Wireless Networks
Edwin K. P. Chong, Editor(s)

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