Outage analysis for optimal beamforming MIMO systems in multikeyhole channels
IEEE Transactions on Signal Processing
Cooperative diversity can mitigate keyhole effects in wireless MIMO systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Performance analysis of optimal joint beamforming in multi-keyhole MIMO channels
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
IEEE Transactions on Communications
On marginal distributions of the ordered eigenvalues of certain random matrices
EURASIP Journal on Advances in Signal Processing
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It has been predicted theoretically that for some environments, the capacity of wireless multiple-input multiple-output systems can become very low even for uncorrelated signals; this effect has been termed "keyhole" or "pinhole". In this paper the first unique measurements of this effect are presented. The measurements were performed in a controlled indoor environment that was designed to obtain a keyhole channel. We analyze limitations due to measurement imperfections for measurement-based capacity calculations and keyhole investigations. We further present a bound for the higher eigenmodes as a function of the finite measurement signal-to-noise ratio and multipath component leakage. The bound is compared to the measurement results and shows excellent agreement. Finally, we analyze the envelope distribution and, as expected from theory, it follows a double-Rayleigh distribution