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Sum Rate Analysis of MUMISO Systems with ZF Beamforming over Composite Fading Channels
Ou ZHAO Hidekazu MURATA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E98A
No.2
pp.558568 Publication Date: 2015/02/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E98.A.558 Type of Manuscript: Special Section PAPER (Special Section on Wideband Systems) Category: Keyword: spatially correlated shadowing, correlated rayleigh fading, sum rate, zeroforcing beamforming, MUMISO,
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Summary:
The performance of multiuser multipleinput singleoutput (MUMISO) systems is not only affected by smallscale multipath fading but also by largescale fading (i.e., shadowing) and path loss. In this paper, we concentrate on the sum rate distribution of MUMISO systems employing linear zeroforcing beamforming, accounting for both multipath fading and shadowing effects, as well as spatial correlation at the transmit and receiver sides. In particular, we consider the classical spatially correlated lognormal model and propose closedform bounds on the distribution of the achievable sum rates in MUMISO systems. With the help of these bounds, we derive a relationship between the interuser distance and sum rate corresponding to 10% of the cumulative distribution function under different environmental conditions. A practical conclusion from our results based on the considered system is that the effect of spatially correlated shadowing can be considered to be independent when the interuser distance is approximately five times the shadowing correlation distance. Furthermore, a detailed analysis of the effects of composite channel attenuation consisting of multipath fading and shadowing is also provided.

