NDLI: Design and Analysis of MIMO Spatial Multiplexing Systems With Quantized Feedback

Content Provider	IEEE Xplore Digital Library
Author	Roh, J.C. Rao, B.D.
Copyright Year	1991
Abstract	This paper investigates the problem of transmit beamforming in multiple-antenna spatial multiplexing (SM) systems employing a finite-rate feedback channel. Assuming a fixed number of spatial channels and equal power allocation, we propose a new criterion for designing the codebook of beamforming matrices that is based on minimizing an approximation to the capacity loss resulting from the limited rate in the feedback channel. Using the criterion, we develop an iterative design algorithm that converges to a locally optimum codebook. Under the independent identically distributed channel and high signal-to-noise ratio (SNR) assumption, the effect on channel capacity of the finite-bit representation of the beamforming matrix is analyzed. Central to this analysis is the complex multivariate beta distribution and tractable approximations to the Voronoi regions associated with the code points. Furthermore, to compensate for the degradation due to the equal power allocation assumption, we propose a multimode SM transmission strategy wherein the number of data streams is determined based on the average SNR. This approach is shown to allow for effective utilization of the feedback bits resulting in a practical and efficient multiple-input multiple-output system design
Sponsorship	IEEE Signal Processing Society
Starting Page	2874
Ending Page	2886
Page Count	13
File Size	644903
File Format	PDF
ISSN	1053587X
Volume Number	54
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Feedback Array signal processing Samarium Algorithm design and analysis Iterative algorithms Signal to noise ratio Channel capacity Signal analysis Degradation transmit beamforming channel information feedback matrix quantization multiple antennas multiple-input multiple-output (MIMO) systems spatial multiplexing
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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