Automated measurements setup for investigating space-temporal characteristics of indoor wireless channels

An automated hardware-software system for probing and measuring the spatiotemporal characteristics of short-range multipath radio channels in indoor environments is presented. Using ultra-wideband channel sounding in a test room of approximately 6 × 7 m square, the frequency and impulse responses of the wireless channel as well as their spatial correlation functions were measured. Measurements were performed in the 2.0…3.0 and 5.3…6.3 GHz frequency bands under line-of-sight (LoS) and non-line-of-sight (NLoS) conditions at 1680 spatial observation points uniformly distributed over a 1200 × 1200 mm area. The measured frequency re-sponses revealed frequency-selective fading with depths of up to 30 dB. The measured impulse responses identified a dominant line-of-sight component with a delay of 8…10 ns and numerous reflections with delays of up to 40 ns, consistent with the geometry of the test room. Three-dimensional spatial correlation maps of the channel characteristics were constructed; the transition from LoS to NLoS conditions resulted in a 15–25 % reduction in the spatial correlation coefficient.

Authors: R. F. Khaliullin, A. I. Sulimov

Direction: Physics

Keywords: wireless communications, multipath propagation, frequency-selective fading, channel impulse response, spatial correlation, MIMO systems

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