Presentation Information
[B-5A-44]Experimental Evaluation of Frequency and Timing Pre-Compensation for Multiple Terminals in mmWave Distributed MIMO
〇Toshiki Takeuchi1, Daichi Shirase1, Kazushi Muraoka1, Koki Seitaibashi1, Yasushi Maruta1, Takuto Arai2, Shuki Wai2, Hibiki Tsukada2, Huiling Jiang3, Satoshi Suyama3 (1. NEC Corporation, 2. NTT, Inc., 3. NTT DOCOMO, INC.)
Keywords:
mmWave,High-Speed Mobility,Distributed MIMO,Frequency and Timing Pre-Compensation
Millimeter-wave (mmWave) spectrum is a promising candidate for Beyond 5G systems to achieve higher data rates and larger capacity. This paper investigates mmWave distributed MIMO for backhaul links to high-mobility platforms such as cars and trains. In high-mobility scenarios, antenna switching can cause rapid changes in Doppler shift and propagation delay, which may degrade link performance when frequency and timing are compensated only at the terminal.To address this issue in a realistic multi-terminal environment, we extend a user-centric control scheme in which the base station pre-compensates the transmit frequency and timing so that each terminal observes nearly constant received frequency and timing. We evaluate the downlink performance using a 40-GHz-band distributed MIMO prototype in a field experiment where two vehicles equipped with terminals travel in opposite directions at 60 km/h.