Interference management for CDMA systems through power control, multiuser detection, and beamforming

Among the ambitious challenges to be met by the third-generation systems is to provide high-capacity flexible services. Code-division multiple access (CDMA) emerges as a promising candidate to meet these challenges. It is well known that CDMA systems are interference-limited, and interference manage...

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Bibliographic Details
Published in:IEEE transactions on communications 2001-07, Vol.49 (7), p.1227-1239
Main Authors: Yener, A., Yates, R.D., Ulukus, S.
Format: Article
Language:English
Subjects:
Algorithms
Code Division Multiple Access
Control systems
Energy management
Filtering
Filters
Filtration
Interference
Interference suppression
Iterative algorithms
Multiaccess communication
Multiuser detection
Multiuser systems
Power control
Power system management
Receivers
Temporal logic
Wireless networks
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Summary:Among the ambitious challenges to be met by the third-generation systems is to provide high-capacity flexible services. Code-division multiple access (CDMA) emerges as a promising candidate to meet these challenges. It is well known that CDMA systems are interference-limited, and interference management is needed to maximally utilize the potential gains of this access scheme. Several methods of controlling and/or suppressing the interference through power control, multiuser detection (temporal filtering), and receiver beamforming (spatial filtering) have been proposed to increase the capacity of CDMA systems up to date. We investigate the capacity increase that is possible by combining power control with intelligent temporal and spatial receiver filter design. The signal-to-interference ratio maximizing joint temporal-spatial receiver filters in unconstrained and constrained filter spaces are derived. Two-step iterative power control algorithms that converge to the optimum powers and the joint temporal and spatial receiver filters in the corresponding filter domains are given. A power control algorithm with a less complex filter update procedure is also given. We observe that significant savings in total transmit power are possible if filtering in both domains is utilized compared with conventional power control and joint optimal power control and filtering in only one domain.
ISSN:0090-6778
1558-0857
DOI:10.1109/26.935163