Gen-2 Open Access Wideband Full-Duplex Radios Integrated in the COSMOS Testbed
We recently integrated four Open-Access Gen-2 Wideband Full-Duplex Radios into the PAWR COSMOS Testbed, allowing for remotely-accessible experimentation. Each Gen-2 FD radio consists of an antenna, a customized Gen-2 RF self-interference (SI) canceller box, and a USRP software-defined radio (SDR). All four Gen-2 FD radios are synchronized via an external clock source and are connectted to a remotely accessible compute node. The RF canceller PCB, shown in Figure 1(a) below, can achieve >50 dB RF SI cancellation across a bandwidth of 20 MHz, as shown in Figure 1(b).
Figure 1. Gen-2 FD canceller board. (a) The implemented Gen-2 RF canceller consisting of a wideband frequency-domain equalization (FDE) path and a narrowband path, (b) the measured TX/RX isolation of the Gen-2 RF canceller without turning on the canceller, and with the narrowband (Gen-1)/wideband (FDE) path on, when the circulator antenna port is connected to an antenna.
For information about accessing and using the integrated Gen-2 FD radios, please see the following resources:
- COSMOS Wiki: Open-access full-duplex wireless in the COSMOS testbed
- COSMOS Wiki: Tutorial on full-duplex wireless (more events and slides can be found here)
GitHub: Open-source FD software for GNU Radio
For further information on the Gen-2 FD hardware and the integration in the COSMOS testbed, please see:
M. Kohli, T. Chen, M. Baarani Dastjerdi, J. Welles, I. Seskar, H. Krishnaswamy, and G. Zussman, "Open-Access Full-Duplex Wireless in the ORBIT and COSMOS Testbeds," in Proc. ACM MobiCom'20 Workshop on Wireless Network Testbeds, Experimental evaluation & CHaracterization (WiNTECH '20) (invited paper), Sept. 2020. [download] [presentation] [video]
T. Chen, M. Baraani Dastjerdi, J. Zhou, H. Krishnaswamy, and G. Zussman, “Wideband Full-Duplex Wireless via Frequency-Domain Equalization: Design and Experimentation,” in Proc. ACM MobiCom’19, Oct. 2019. [download] [presentation]