Prototyping of 40 GHz Band Orbital Angular Momentum Multiplexing System and Evaluation of Field Wireless Transmission Experiments

Prototyping of 40 GHz Band Orbital Angular Momentum Multiplexing System and Evaluation of Field Wireless Transmission Experiments

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We are developing a spatial multiplexing technique based on orbital angular momentum (OAM) that is Course a pied - Accessoires - Livre capable of 1 Tbit/s point-to-point wireless transmissions for the sixth generation mobile communication system.In this paper, we describe a demonstration of 100 Gbit/s wireless transmission over a range of 100 m that used OAM multiplexing of 15 streams with a 1.5 GHz bandwidth ( $39.

5-41$ GHz).The OAM modes of this system were generated using a Butler matrix that allows discrete Fourier transform (DFT) operations to be performed in analog circuits.We designed $8 imes 8$ Butler matrices to generate OAM modes by combining hybrid couplers and phase shifters.

Since this Butler matrix was connected to 16 element antennas, two $8 imes 8$ Butler matrices Vacuum Sound Proofing were connected to make an $8 imes 16$ matrix.Furthermore, since these inputs were in 7 OAM mode, one port was terminated to create a $7 imes 16$ Butler matrix.It was confirmed that the mode isolation was more than 15 dB in the 1.

5 GHz bandwidth.Next, we designed microstrip antennas for a horizontal and vertical polarization uniform circular array (UCA) to radiate the OAM modes.Then, we implemented radio frequency (RF) chains and digital signal processing, including single copyright-frequency domain equalization and adaptive modulation and coding.

A transmission experiment conducted in a field line-of-sight environment showed that the system could transmit at 119.45 Gbit/s at a distance of 100 meters, thereby demonstrating the feasibility of wideband OAM transmission in the millimeter-wave band.