Coherence bandwidth measurement in indoor broadband propagation channel at unlicensed 60 GHz band


Reported are the results of a coherence bandwidth experimental investigation of broadband propagation measurements for future millimetre-wave WLANs. Based mostly on a sweeping-frequency sounding technique (59.half-dozen-sixty.half-dozen-GHz), the channel coherence bandwidth (Bc) is estimated in 2 typical indoor environments: (a) a 20 m, non-line-of-sight (NLOS) T-formed corridors intersection, with and without the presence of a transmission route deflecting obstacle (DO), and (b) a line-of-sight (LOS) empty conference area. Results demonstrate thats millimetre-wave communications are very sensitive to the propagation environment. Therefore, precise information of phases and amplitudes across the band of interest are essential for accurate estimation of the channel Bc. Results also indicate that the NLOS millimetre-wave environments are very hostile and therefore the presence of DOs may enhance significantly the millimetre-wave propagation characteristics as well as the channel Bc.

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