Spatial vs. multi-user diversity trade-offs for cross-layer scheduling in limited feedback systems

In this paper, we explore spatial vs. multi-user diversity trade-offs in a cellular system with or without bandwidth restrictions in the feedback channel. More precisely, we are interested in assessing the impact of both antenna selection and space–time coding strategies in such a multi-user system. The centralized scheduler makes an extensive use of physical layer measures and, hence, this constitutes a cross-layer design. Performance assessment is conducted both analytically and by means of computer simulations, in terms of pdf and CDF distributions, average system capacity and throughput. Closedform expressions are derived for the SNR densities associated to the different transmission configurations along with an approximate expression for system throughput. r 2005 Elsevier B.V. All rights reserved.