  Due to its low energy consumption and simplicity, near field communication
(NFC) has been extensively used in various short-range transmission scenarios,
for example, proximity payment and NFC entrance guard. However, the low data
rate of NFC limits its application in high rate demanded scenarios, such as
high-resolution fingerprint identification and streaming media transmission as
well as the future promising high rate indoor communications among pads,
phones, and laptops. In this paper, we model and analyze the performance of the
orbital angular momentum based NFC (OAM-NFC) system, which can significantly
increase the capacity of NFC. We first give the OAM system model. With coils
circularly equipped at the transmitter and receiver, OAM-NFC signals can be
transmitted, received, and detected. Then, we develop the OAM-NFC generation
and detection schemes for NFC multiplexing transmission. We also analyze the
OAM-NFC channel capacity and compare it with those of
single-input-single-output (SISO) as well as multi-input-multi-output (MIMO)
NFC. Simulation results validate the feasibility and capacity enhancement of
our proposed OAM-NFC system. How different variables, such as the transceiver
misalignment, the numbers of transceiver coils, and transceiver distance,
impact the OAM-NFC capacity are also analyzed.
