Multipath measurements for indoor high-speed wireless communication systems

There is an increasing demand for high data rate wireless transmission for indoor radio network and personal communication network systems. The millimeter wave frequency band is promising to support such applications since it offers wide bandwidths. However, higher operating frequencies and higher data rates result in increased multipath problems, i.e., the degradation of transmission quality. In fact, in indoor environment energy may amve from different directions and at different times, due to reflections and diffractions from surrounding objects, and these multipath propagation routes cause deep fades in the received signal and give rise to intersymbol interference due to the symbol spreadness. The design and planning of a high-performance broadband systems, requires detailed knowledge of the wave propagation channel and the most critical issues which might influence the channel would be the base-station antennas, because their radiation pattems have a great impact upon the channel capacity and the coverage rangetl]. For this reason, several versions of base-station antennas (BS) must be developed to meet the cell architecture.