Multi-Access MIMO Systems with Finite Rate Channel State Feedback

Details Multi-Access MIMO Systems with Finite Rate Channel State Feedback Multi-Access MIMO Systems with Finite Rate Channel State Feedback

2007-05-16

arxiv.org/abs/0705.2270v1

Computer Science

Information Theory

10 pages. In Proc. Allerton Conf. on Commun., Control, and Computing, 2005

Scientific paper

This paper characterizes the effect of finite rate channel state feedback on the sum rate of a multi-access multiple-input multiple-output (MIMO) system. We propose to control the users jointly, specifically, we first choose the users jointly and then select the corresponding beamforming vectors jointly. To quantify the sum rate, this paper introduces the composite Grassmann manifold and the composite Grassmann matrix. By characterizing the distortion rate function on the composite Grassmann manifold and calculating the logdet function of a random composite Grassmann matrix, a good sum rate approximation is derived. According to the distortion rate function on the composite Grassmann manifold, the loss due to finite beamforming decreases exponentially as the feedback bits on beamforming increases.

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