TUTCRIS - Tampereen teknillinen yliopisto


5G new radio evolution towards sub-THz communications



Otsikko2nd 6G Wireless Summit 2020
AlaotsikkoGain Edge for the 6G Era, 6G SUMMIT 2020
ISBN (elektroninen)9781728160474
DOI - pysyväislinkit
TilaJulkaistu - 1 maaliskuuta 2020
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
Tapahtuma6G Wireless Summit6G Wireless Summit, 6G SUMMIT -
Kesto: 1 tammikuuta 2000 → …


Conference6G Wireless Summit6G Wireless Summit, 6G SUMMIT
Ajanjakso1/01/00 → …


In this paper, the potential of extending 5G New Radio physical layer solutions to support communications in sub-THz frequencies is studied. More specifically, we introduce the status of third generation partnership project studies related to operation on frequencies beyond 52.6 GHz and note also the recent proposal on spectrum horizons provided by federal communications commission (FCC) related to experimental licenses on 95 GHz-3 THz frequency band. Then, we review the power amplifier (PA) efficiency and output power challenge together with the increased phase noise (PN) distortion effect in terms of the supported waveforms. As a practical example on the waveform and numerology design from the perspective of the PN robustness, link performance results using 90 GHz carrier frequency are provided. The numerical results demonstrate that new, higher subcarrier spacings are required to support high throughput, which requires larger changes in the physical layer design. It is also observed that new phase-tracking reference signal designs are required to make the system robust against PN. The results illustrate that single-carrier frequency division multiple access is significantly more robust against PN and can provide clearly larger PA output power than cyclic-prefix orthogonal frequency division multiplexing, and is therefore a highly potential waveform for sub-THz communications.