NDLI: Scaling Law of the Sum-Rate for Multi-Antenna Broadcast Channels with Deterministic or Selective Binary Feedback

Content Provider	IEEE Xplore Digital Library
Author	Diaz, J. Simeone, O. Somekh, O. Bar-Ness, Y.
Copyright Year	2006
Description	Author affiliation: Center for Wireless Communications and Signal Processing Research (CWCSPR), New Jersey Institute of Technology, Newark, NJ 07102, USA, Email: jordi.diaz@njit.edu (Diaz, J.)
Abstract	The sum-capacity of the multi-antenna Gaussian broadcast channel is known to be achieved by Dirty Paper Coding techniques, that require full channel state information at the base station. It has been recently shown that a sum-rate having the same scaling law of the sum-capacity with respect to the number of users n for a fixed signal to noise ratio (i.e., M log log n where M is the number of transmitting antennas) can be achieved by using reduced feedback (or equivalently reduced channel state information at the transmitter). In particular, it has been proved that n real and n integer numbers are enough to guarantee the optimal scaling law. In this paper, the optimal scaling law of the sum-rate is shown to be achievable with an even smaller amount of feedback and, more precisely, with 1) n log2(M + 1) bits, if a deterministic feedback scheme is employed; 2) an average number of feedback bits that scales as M log2M log n with the number of users n, if a selective (random) feedback scheme is employed.
Starting Page	298
Ending Page	301
File Size	369680
Page Count	4
File Format	PDF
ISBN	142440035X
DOI	10.1109/ITW.2006.1633833
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-13
Publisher Place	Uruguay
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadcasting Signal to noise ratio State feedback Transmitters Downlink Array signal processing Quantization Fading Broadcast technology Wireless communication
Content Type	Text
Resource Type	Article

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