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ABSTRACT
In order to support experimentation with full-duplex (FD)
wireless, we recently integrated two generations of FD radios
in the open-access ORBIT and COSMOS testbeds. First, we integrated a customized 1st generation (Gen-1) narrowband FD
radio in the indoor ORBIT testbed. Then, we integrated two
2
nd generation (Gen-2) wideband FD radios in the city-scale
PAWR COSMOS testbed. Each integrated FD radio consists of
an antenna, a customized RF self-interference (SI) canceller
box, a USRP software-defined radio (SDR), and a remotely accessible compute node. The Gen-1/Gen-2 RF SI canceller box
includes an RF canceller printed circuit board (PCB) which
emulates a customized integrated circuit (IC) RF canceller
implementation. The amplitude- and phase-based Gen-1 narrowband RF canceller achieves 40 dB RF SIC across 5 MHz.
The Gen-2 wideband canceller is based on the technique of
frequency-domain equalization (FDE) and achieves 50 dB RF
SI cancellation (SIC) across 20 MHz. In this paper, we present
the design and testbed integration of the two generations
of FD radios. We then present example experiments that
can be remotely run and modified by experimenters. Finally,
we discuss future improvements and potential FD wireless
experiments that can be supported by these open-access FD
radios integrated in the COSMOS testbed.
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