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The allocation of spectrum for wireless standards in the 5 GHz band within Europe, Japan and the United States has created a big interest for propagation studies in this band. In this paper we present wideband measurements at 5.8 GHz performed by placing a transmitter outside an office building and moving a receiver inside the building while sampling complex impulse responses. The results show that the penetration loss is best described by a non-linear function with the number of wall sections as a parameter. Average penetration loss between indoor and outdoor receiver/transmitter was found to be 16 dB. The specific location inside the building will also affect the shape of the power delay profile with multi-path components becoming more dominant well inside the building. The direction of arrival of the incoming waves is estimated using MUSIC, and power delay direction profiles supporting the nonlinear penetration-loss function are presented.

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