[article-cris] Sähkötekniikan korkeakoulu / ELEC

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Browsing [article-cris] Sähkötekniikan korkeakoulu / ELEC by Subject "140 GHz"

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  • Comparing radio propagation channels between 28 and 140 GHz bands in a shopping mall
    (2018) Nguyen, Sinh; Järveläinen, Jan; Karttunen, Aki; Haneda, Katsuyuki; Putkonen, Jyri
     A4 Artikkeli konferenssijulkaisussa
    In this paper, we compare the radio propagation channels characteristics between 28 and 140 GHz bands based on the wideband (several GHz) and directional channel sounding in a shopping mall environment. The measurements and data processing are conducted in such a way to meet requirements for a fair comparison of large- and small- scale channel parameters between the two bands. Our results reveal that there is high spatial-temporal correlation between 28 and 140 GHz channels, similar numbers of strong multipath components, and only small variations in the large-scale parameters between the two bands. Furthermore, when including the weak paths there are higher total numbers of clusters and paths in 28 GHz as compared to those in 140 GHz bands. With these similarities, it would be very interesting to investigate the potentials of using 140 GHz band in the future mobile radio communications.
  • Comparison of Indoor Propagation Channels at 28 GHz and 140 GHz Bands
    (2024) De Guzman, Mar Francis; Haneda, Katsuyuki
     A4 Artikkeli konferenssijulkaisussa
    In this paper, a comparison between the measured 28 GHz and 140 GHz channels in an entrance hall is presented. The path loss, angular spread, delay spread, and composite power angular spectrum (PAS) are evaluated and compared with reference indoor channels in an office, existing model, and shopping mall. The existing model and office path loss curves align with the path loss of line-of-sight (LOS) and non-LOS (NLOS) links, respectively. When using the full dynamic range, the angular spread does not change with frequency, while the delay spread decreases with frequency in the entrance hall. The differences in angular spread and delay spread vary between the entrance hall and other indoor environments due to differences in layout. The composite PAS at both bands are similar for both LOS and NLOS links. The channels have larger angular and delay spread at 140 GHz than 28 GHz when the same dynamic range is used.