NDLI: MIMO-CDMA systems: signature and beamformer design with various levels of feedback

Content Provider	IEEE Xplore Digital Library
Author	Serbetli, S. Yener, A.
Copyright Year	1991
Abstract	We investigate the signature and beamformer design problem for the uplink of multiple-input multiple-output code-division multiple-access (MIMO-CDMA) systems with the sum capacity and the systemwide mean-square error (MSE) as performance metrics. We first construct iterative algorithms to find the jointly optimum temporal signatures and transmit beamformers under the assumption of perfect temporal signature and transmit beamforming feedback. Next, motivated by the need to reduce the amount of feedback, we present a low-complexity sequential orthogonal temporal signature assignment algorithm for given transmit beamformers. Our approach is based on minimizing the difference between the performance of the MIMO-CDMA system and the described upper bounds at each signature assignment step. We next note that the transmit beamformers can be shaped depending on the channel state information (CSI) available at the transmitter. We investigate the cases of various levels of available feedback resulting in different beamformer structures and present a joint orthogonal temporal signature assignment and beamforming algorithm. We observe that as the available feedback level is increased, the performance of the joint signature and beamformer assignment algorithm approaches the performance upper bounds. In particular, we observe that a substantial performance gain is obtained when the individual channel state information is available at the transmitter side
Sponsorship	IEEE Signal Processing Society
Starting Page	2758
Ending Page	2772
Page Count	15
File Size	583588
File Format	PDF
ISSN	1053587X
Volume Number	54
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback Iterative algorithms Array signal processing Upper bound Channel state information Transmitters MIMO Multiaccess communication Measurement Performance gain transmit beamforming Mean-square error (MSE) multiple-input multiple-output code-division multiple-access (MIMO-CDMA) system signature sequences sum capacity
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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