UWB indoor propagation channel measurements and data analysis in various types of high-rise apartments

This paper presents the extensive ultra wideband (UWB) indoor propagation channel measurements conducted in various types of high-rise apartments based in several cities in Korea. A vector network analyzer was used to measure the channel transfer functions in the frequency band of 3-10 GHz. The corresponding channel impulse responses were calculated by taking inverse Fourier transforms of the recorded channel transfer functions. Measurements were made in 8-10 distinct receiver (RX) local points throughout the apartment ranging from 1-20 m apart from the fixed transmitter location. At each RX local point; the RX was moved 25 times over a square grid of 5/spl times/5 spatial points spaced 15 cm apart. This measurement procedure allows us to characterize both the small-scale and the large-scale statistics of the channel. Various communication links were considered including both line-of-sight (LOS) and non-LOS (NLOS) scenarios. Both data analysis technique and measurement results are presented in the form of power delay profile and rms delay spread. The aim here is to study in more detail the behavior of the UWB propagation channel and to provide more measurement data required for the standardization activities in the IEEE 802.15.4a channel modeling subgroup.