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NIST is investigating radio communications problems faced by emergency responders (e.g., firefighters and police) in disaster situations such as collapsed buildings. A fundamental challenge to communication into and out of large buildings is the strong attenuation of radio signals caused by losses and scattering in the building materials and structures, and the problem is amplified in a collapsed...
We explore the effect of loading a reverberation chamber on the calculation of the correlation coefficient of two-element antenna arrays (similar to the type used in multiple-input multiple-output (MIMO) wireless devices). The changes in correlation coefficient with loading are compared to the changes in a squared, mismatch-corrected version of the transmission coefficient 〈|Sxy|2〉 as a function of...
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