Chris D. Rouse, Brent R. Petersen and Bruce G. Colpitts, "Characterising an in-room MIMO system employing elevation-directional access point antennas," Wireless Personal Communications, no. 5, pp. 1-17, May. 2017.


The performance of an in-room MIMO system is investigated with the use of elevation-directional access point (AP) antennas which emphasize wall-reflected NLOS components instead of non-directional antennas. Simulation results suggest that the mean MIMO capacity throughout an idealised in-room environment can be improved on the order of 14% coupled with a 3% increase in mean relative MIMO gain if the appropriate main-lobe elevation direction is selected. The associated antennas are omnidirectional in azimuth and exhibit directivities and elevation half-power beamwidths on the order of 6 dBi and 28 degrees, respectively. Experimental results obtained via channel measuremens reveal more modest improvements due to the increased multipath richness exhibited by the real environment; a mean capacity improvement of approximately 5% is achieved, but this is accompanied by a minor reduction in relative MIMO gain. This level of performance may not be significant enough to warrant switching to elevation-directional AP antennas; however, the measured results provide qualitative verification of the simulation model. In any case, the results quantify the modest in-room MIMO performance gains one should expect when considering only wall reflections in the design of elevation-directional AP antennas at microwave frequencies.


This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the University of New Brunswick (UNB).


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