Field Experiment of 117 Gbit/s Wireless Transmission Using OAM Multiplexing at a Distance of 200 m on 40 GHz Band
Yasunori Yagi, Hirofumi Sasaki, Tomoki Semoto, Tomoya Kageyama, Takayuki Yamada, Jun Mashino, Doohwan Lee
Abstract
In this paper, we demonstrate outdoor wireless transmission using orbital angular momentum (OAM) multiplexing on a 40 GHz band. OAM beams are generated by a Butler matrix analog radio-frequency (RF) circuit and radiated from uniform circular arrays (UCAs). We implemented an OAM multiplexing transmitter (Tx) and receiver (Rx) on a 40-GHz band. This Tx and Rx can generate and separate seven OAM modes (-3, -2, -1, 0, 1, 2, 3) and two polarizations (vertical and horizontal), a total of 15 streams, including the center antenna element which can transmit OAM mode 0. Each channel carries a 1.5 Gbaud signal. We previously reported a 119 Gbit/s transmission at a distance of 100 m using this equipment. This time, we used signal processing with transmit precoding based on singular value decomposition (SVD) to achieve a greater transmission distance. Then, we evaluated the transmission capacity at distances of 100 m and 200 m. The results show that a 137 Gbit/s wireless data transmission is successful at a distance of 100 m and a 117 Gbit/s wireless data transmission is successful at a distance of 200 m.