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Linear beamforming for the spatially correlated MISO broadcast channel

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/196083

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Title: Linear beamforming for the spatially correlated MISO broadcast channel
Related: IEEE International Symposium on Information Theory (13 - 18 June 2010 : Austin, TX)
Related: ISIT2010 : 2010 IEEE International Symposium on Information Theory Proceedings, p.2268-2272
DOI: 10.1109/ISIT.2010.5513553
Publisher: IEEE
Date: 2010
Author/Creator: Raghavan, Vasanthan
Author/Creator: Veeravalli, Venugopal
Author/Creator: Hanly, Stephen
Description: A spatially correlated broadcast setting with M antennas at the base station and M users (each with a single antenna) is considered. We assume that the users have perfect channel information about their links and the base station has only statistical information about each user's link. The base station employs a linear beamforming strategy with one spatial eigen-mode allocated to each user. The goal of this work is to understand the structure of the beamforming vectors that maximize the ergodic sum-rate achieved by treating interference as noise. In the M = 2 case, we first fix the beamforming vectors and compute the ergodic sum-rate in closed-form as a function of the channel statistics. We then show that the optimal beamforming vectors are the dominant generalized eigenvectors of the covariance matrices of the two links. It is difficult to obtain intuition on the structure of the optimal beamforming vectors for M > 2 due to the complicated nature of the sum-rate expression. Nevertheless, in the case of asymptotic M, we show that the optimal beamforming vectors have to satisfy a set of fixed-point equations.
Description: 5 page(s)
Resource Type: conference paper
Organisation: Macquarie University. Dept. of Electronic Engineering

Identifier: http://hdl.handle.net/1959.14/196083
Identifier: ISBN:9781424469604
Identifier: mq_res-ext-2-s2.0-77955668778
Language: eng
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