Open-Access Full-Duplex Wireless

Full-duplex (FD) wireless – simultaneous transmission and reception at the same frequency – has the potential to double network capacity at the PHY layer and to provide other benefits at higher layers. Despite extensive research, there is no open-access wireless testbed with FD-capable nodes, which is crucial for experimental evaluations of FD-related algorithms at the higher layers. To allow the broader community to experiment with FD, we developed and integrated an open-access 1st-generation narrowband RF canceller with a USRP N210 SDR in the ORBIT testbed [1], [3—5]. We also developed a 2nd-generation FD radio that achieves improved performance and bandwidth of RF self-interference cancellation through the technique of frequency-domain equalization (FDE) [2]. We are now integrating this wideband FD radio in the COSMOS testbed and provide more advanced example experiments at different layers of the network stacks (PHY, Link, and above).

[1] T. Chen, J. Welles, M. Kohli, M. Baraani Dastjerdi, J. Kolodziejski, M. Sherman, I. Seskar, H. Krishnaswamy, and G. Zussman, “Experimentation with full-duplex wireless in the COSMOS testbed,” in Proc. IEEE ICNP’19 Workshop Midscale Education and Research Infrastructure and Tools (MERIT), 2019. [download]

[2] 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 (to appear), 2019. [download]

[3] T. Chen, M. Baraani Dastjerdi, G. Farkash, J. Zhou, H. Krishnaswamy, and G. Zussman, “Open-access full-duplex wireless in the ORBIT testbed,” arXiv:1801.03069v2 [cs.NI], May 2018. [download]

[4] The Columbia FlexICoN project

[5] Full-duplex experiments instructions

[6] Source code (GitHub)

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