Demonstration of Tunable Steering and Multiplexing of Two 28 GHz Data Carrying Orbital Angular Momentum Beams Using Antenna Array.
In line-of-sight communication systems, accurate alignment between the transmitter and receiver is important to guarantee sufficient signal power at the receiver. Such alignment is even more important for orbital angular momentum (OAM) multiplexing systems since misalignment between the transmitter and receiver may cause crosstalk among channels. In this paper, we demonstrate the simultaneous generation and tunable steering of two OAM beams utilising a custom-designed circular antenna array at 28 GHz. We achieve a steering angle of up to 35 degrees from the antenna array normal. We find that (i) the steering angle of the generated OAM beams is limited by the emitting angle of the antenna elements, and (ii) a larger steering angle may degrade the mode purity of the generated OAM beams as well as induce inter-symbol-interference to each of the individual channels. Moreover, we demonstrate the transmission of two 1-Gbaud quadratic phase shift keying (QPSK) signal over the two steerable OAM beams with both multiplexed channels achieved bit error rates (BERs) of <3.8 × 10-3.
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Guodong
G
Xie
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Zhe
Z
Zhao
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Yan
Y
Yan
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Long
L
Li
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Yongxiong
Y
Ren
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Nisar
N
Ahmed
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Yinwen
Y
Cao
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Asher J
AJ
Willner
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Changjing
C
Bao
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Zhe
Z
Wang
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Cong
C
Liu
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Morteza
M
Ziyadi
Intel Labs, Intel Corporation, Santa Clara, CA 95054, USA.
Shilpa
S
Talwar
Intel Labs, Intel Corporation, Santa Clara, CA 95054, USA.
Soji
S
Sajuyigbe
NxGen Partners, Dallas, TX 75219, USA.
Solyman
S
Ashrafi
School of Electrical Engineering, Tel Aviv University, Ramat Aviv 69978, Israel.
Moshe
M
Tur
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Andreas F
AF
Molisch
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Alan E
AE
Willner