Building leakage propagation measurements for indoor cognitive radio systems

Measurements of radio signal leakage from a building at 821 MHz and 2.193 GHz are presented. It is shown that the COST231 outdoor-to-indoor building penetration model is suitable for predicting this leakage. Indoor locations that give the best indication of leaked power are also identified. These are important if indoor cognitive radio transmitter powers are to be controlled dynamically by an indoor sensor network. Signal strength at indoor locations near the building walls exhibits high correlation with the leaked power.