Blockage/shadowing and polarization measurements at 2.45 GHz for interference evaluation between Bluetooth and IEEE 802.11 WLAN

We present measurement results at 2.45 GHz to evaluate blockage/shadowing and fading effects due to furniture and people next to terminals for short range indoor communication systems. The following are the results: people crossing the link near to a terminal can cause fading of up to 20 dB, which is more than the measured furniture blockage of about 5-13 dB, depending on objects over the link; polarization coupling was also measured, by using a dual polarized antenna at the receiving end, and coupling is higher for obstructed links, which suggests the use polarization diversity (see Kim, S., "Modeling and Analysis of Indoor Wireless Communication Channel", Ph.D. Thesis, Polytechnic University, Brooklyn, 1995).