TR2003-136
| Keyhole Effects in MIMO Wireless Channels - Measurements and Theory | |||
| Citation: |
* Almers, P.; Tufvesson, F.; Molisch, A.F., "Keyhold Effect in MIMO Wireless Channels: Measurements and Theory", IEEE Transactions on Wireless Communications, ISSN: 1536-1276, Vol. 5, Issue 12, pp. 3596-3604, December 2006 (IEEE Xplore) Almers, P.; Tufvesson, F.; Molisch, A.F., "Keyhole Effects in MIMO Wireless Channels-Measurements and Theory", IEEE Global Telecommunications Conference (GLOBECOM), Vol. 4, pp. 1781-1785, December 2003 (IEEE Xplore) | ||
| Date: | December 2003 | ||
| MERL Contact: | Andreas F. Molisch | ||
It has been predicted theoretically that for some environments, the capacity of wireless MIMO 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. We analyze limitations for measurement-based capacity calculations and keyhole investigations. We further present error bounds for the capacity and eigenvalue distributions due to measurement imperfections such as finite signal-to-noise ratio and multipath leakage. The bounds are compared to the measurement results and show excellent agreement. Finally, we analyze the envelope distribution and, as expected from theory, if follows a double Rayleigh. | |||
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