NTT DOCOMO, Rohde & Schwarz explore new research beyond mmWave

29 Nov 2018

RCR Wireless News writes that while the telecoms industry gears up to realise the commercial availability of 5G by making use of millimetre wave (mmWave) frequencies for cellular services, test company Rohde & Schwarz and Japanese cellco NTT DOCOMO are already looking beyond the horizon to exploit frequency bands from 100GHz to 300GHz. This week, the pair reportedly began exploring the potential of spectrum up to 150GHz, conducting channel sounding experiments to characterise those bands, in what Rohde & Schwarz claims in ‘the world’s first ultra-wideband channel sounder for mobile communications exceeding 100GHz’. The company see the potential in higher bands to deliver even higher data speeds and large-capacity communication for the next generation beyond 5G, although it recognises that bands between 100GHz and 300GHz are ‘even more likely to be strongly affected by path loss and blocking by objects and weather such as rain, necessitating research into exactly how they behave’. Nonetheless, the joint statement notes that DOCOMO has been using Rohde & Schwarz’s SMW200A signal generator with its SMZ frequency multiplier to generate the signal, and the R&S FSW85 signal and spectrum analyser with the R&S FS-Z170 harmonic mixer for analysis, with analysis bandwidth of up to two gigahertz. Measurement parameters include the propagation loss, the power delay profile (or the arrival time of radio waves), and the angular profile, an indicator of radio wave arrival, according to Rohde & Schwarz.