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In this paper, we compare the radio propagation channels characteristicsbetween 28 and 140 GHz bands based on the wideband (several GHz) anddirectional channel sounding in a shopping mall environment. The measurementsand data processing are conducted in such a way to meet requirements for a faircomparison of large- and small- scale channel parameters between the two bands.Our results reveal that there is high spatial-temporal correlation between 28and 140 GHz channels, similar numbers of strong multipath components, and onlysmall variations in the large-scale parameters between the two bands.Furthermore, when including the weak paths there are higher total numbers ofclusters and paths in 28 GHz as compared to those in 140 GHz bands. With thesesimilarities, it would be very interesting to investigate the potentials ofusing 140 GHz band in the future mobile radio communications.

Comparing Radio Propagation Channels Between 28 and 140 GHz Bands in a Shopping Mall