NDLI: Throughput effects of noisy feedback of channel state information in multiple-antenna systems

Content Provider	IEEE Xplore Digital Library
Author	Zhang, J. Lehnert, J.S.
Copyright Year	2005
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA (Zhang, J.; Lehnert, J.S.)
Abstract	With a new throughput metric, the impact of noisy feedback of channel state information (CSI) is studied for a multiple-input, single-output (MISO) system. The covariance matrix of the input that maximizes the throughput is obtained. Results show that beamforming can achieve the maximal throughput only if the SNR of the CSI feedback is sufficiently large. With a new throughput metric, a necessary condition for the optimality of beamforming is determined, and the necessary and sufficient condition is numerically found with the Gauss-Chebyshev quadrature method. Analysis of beamforming transmission shows that at a fairly high SNR for CSI feedback the rate allocation needs to be reduced, while at low SNR for CSI feedback, the allocated rate should be increased. When two-mode transmission is adopted, beamforming may be preferred over spatial diversity even when the necessary condition for the optimality of beamforming is not met.
Starting Page	826
Ending Page	830
File Size	810192
Page Count	5
File Format	PDF
ISBN	0780388674
DOI	10.1109/SPAWC.2005.1506255
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput State feedback Channel state information Array signal processing Physical layer Transmitters Measurement Gaussian processes Sufficient conditions Availability
Content Type	Text
Resource Type	Article

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