Full-duplex Wireless: From Integrated Circuits to Networks (FlexICoN)
The growing demand for wireless bandwidth and congestion of the wireless spectrum call for the design of spectrum efficient methods to support emerging new 5G standards. Full-duplex communication — simultaneous transmission and reception on the same frequency channel — is an emerging and transformative communication technology that can substantially improve spectrum efficiency.
To bring full-duplex communication closer to practical implementation and evaluate the benefits of using such a technology, we have been performing research as a part of the Full-duplex Wireless: From Integrated Circuits to Networks (FlexICoN) project. This is a cross-disciplinary multi-PI research effort to exploit the interactions between the physical and the higher layers in full-duplex systems.
At the WiMNet lab, we have been evaluating the benefits of full-duplex communication based on realistic full-duplex hardware models, for the hardware that was designed and developed within the FlexICoN project. Our results include insightful analytical and algorithmic results for power control on full-duplex links. We have also quantified the achievable full-duplex gains in various full-duplex communication scenarios. Our current research efforts are directed towards the design of joint scheduling and resource allocation algorithms for Wi-Fi and small-cell cellular networks. We are also developing a full-duplex testbed that will be used for implementation and evaluation of our algorithmic results.
An overview of the project is available in an IEEE Spectrum Article (July 2016).
Publications
[1]
M. Kohli, M. B. Dastjerdi, J. Zhou, I. Seskar, H. Krishnaswamy, G. Zussman, and T. Chen, “Design and testbed deployment of frequency-domain equalization full duplex radios,” IEEE Transactions on Wireless Communications (to appear), 2025.
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[1]
A. Levin, E. F. Portillo, S. Garikapati, A. Bechhofer, B. Zhang, M. Kohli, I. Kadota, H. Krishnaswamy, M. Seok, and G. Zussman, “Demo: Achieving self-interference cancellation across different environments,” in Proc. ACM MobiCom’24, 2024.
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[1]
A. Levin, M. Kohli, I. Kadota, T. Chen, S. Garikapati, A. Nagulu, M. B. Dastjerdi, J. Zhou, I. Seskar, H. Krishnaswamy, and G. Zussman, “Enabling integrated circuit-based full-duplex wireless in GNU radio,” in Proc. GNU Radio Conference, 2024.
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[1]
A. Nagulu, N. Reiskarimian, T. Chen, S. Garikapati, I. Kadota, T. Dinc, S. L. Garimella, M. Kohli, A. S. Levin, G. Zussman, and H. Krishnaswamy, “Doubling down on wireless capacity: A review of integrated circuits, systems, and networks for full duplex,” Proceedings of the IEEE, vol. 112, no. 5, pp. 405–432, Aug. 2024.
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[1]
S. Garikapati, A. Nagulu, I. Kadota, M. Essawy, T. Chen, S. Wang, T. Pande, A. Natarajan, G. Zussman, and H. Krishnaswamy, “Full-duplex receiver with wideband, high-power RF self-interference cancellation based on capacitor stacking in switched capacitor delay lines,” IEEE Journal of Solid-State Circuits, vol. 59, no. 7, pp. 2105–2120, Jul. 2024.
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[1]
M. Kohli, M. B. Dastjerdi, J. Zhou, I. Seskar, H. Krishnaswamy, G. Zussman, and T. Chen, “Design and testbed deployment of frequency-domain equalization full duplex radios,” arXiv:2401.17751 [cs.NI], Jan. 2024.
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[1]
A. Levin, I. Kadota, S. Garikapati, B. Zhang, A. Jolly, M. Kohli, M. Seok, H. Krishnaswamy, and G. Zussman, “Demo: Experimentation with wideband real-time adaptive full duplex radios,” in Proc. ACM SIGCOMM’23, 2023.
[download] ACM SIGCOMM Student Research Competition (SRC) Winner – First Place
[1]
S. Garimella, S. Garikapati, A. Nagulu, I. Kadota, A. Davidson, G. Zussman, and H. Krishnaswamy, “Frequency-domain-equalization-based full-duplex receiver with passive-frequency-shifting N-path filters achieving >53 dB SI suppression across a record 160 MHz BW,” in Proc. IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2023.
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[1]
A. Jolly, “Real-time adaptive wideband full duplex radios,” M.S. Thesis, Columbia University, 2023.
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T. Chen, M. Baraani Dastjerdi, H. Krishnaswamy, and G. Zussman, “Wideband full-duplex phased array with joint transmit and receive beamforming: Optimization and rate gains,” IEEE/ACM Transactions on Networking, vol. 29, no. 4, pp. 1591–1604, Aug. 2021.
[download] [presentation]
[1]
M. Kohli, T. Chen, M. Baraani Dastjerdi, J. Welles, I. Seskar, H. Krishnaswamy, and G. Zussman, “Open-access full-duplex wireless in the ORBIT and COSMOS testbeds,” Computer Networks, no. 199, p. 108420, Aug. 2021.
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[1]
T. Chen, S. Garikapati, A. Nagulu, A. Gaonkar, M. Kohli, I. Kadota, H. Krishnaswamy, and G. Zussman, “A survey and quantitative evaluation of integrated circuit-based antenna interfaces and self-interference cancellers for full-duplex,” IEEE Open Journal of the Communications Society, Special issue on Full-Duplex Transceivers for Future Networks: Theory and Techniques, vol. 2, pp. 1753–1776, Jul. 2021.
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[1]
A. Nagulu, A. Gaonkar, S. Ahasan, S. Garikapati, T. Chen, G. Zussman, and H. Krishnaswamy, “A Full-duplex receiver with true-time-delay cancelers based on switched-capacitor-networks operating beyond the delay-bandwidth limit,” IEEE Journal of Solid-State Circuits, vol. 56, no. 5, pp. 1398–1411, May 2021.
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[1]
A. Nagulu, S. Garikapati, I. Kadota, M. Essawy, T. Chen, A. Natarajan, G. Zussman, and H. Krishnaswamy, “Full-duplex receiver with wideband multi-domain FIR cancellation based on stacked-capacitor, N-path switched-capacitor delay lines achieving >+54dB SIC Across 80MHz BW and >+15dBm TX power handling,” in Proc. IEEE ISSCC’21, 2021.
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[1]
J. Zhou, T. Chen, Y. Cao, G. Zussman, and H. Krishnaswamy, “Frequency-domain RF cancellation,” in In-Band Full-Duplex Technologies and Applications (ed: K. Kolodziej) (invited), Artech House, 2021.
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[1]
M. Baraani Dastjerdi, T. Chen, G. Zussman, and H. Krishnaswamy, “Multiple-input multiple-output array systems,” in In-Band Full-Duplex Technologies and Applications (ed: K. Kolodziej) (invited), Artech House, 2021.
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[1]
A. Nagulu, T. Chen, G. Zussman, and H. Krishnaswamy, “Multi-watt, 1GHz CMOS circulator based on switched-capacitor clock boosting,” IEEE Journal of Solid-State Circuits, vol. 55, no. 12, pp. 3308–3321, Dec. 2020.
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[1]
S. Garikapati, A. Gaonkar, A. Nagulu, T. Chen, G. Zussman, and H. Krishnaswamy, “Performance comparison of time-domain and frequency-domain RF self-interference cancellation in full-duplex wireless systems,” in Proc. Asilomar Conference on Signals, Systems, and Computers (invited), 2020.
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[1]
T. Chen, “Algorithms and experimentation for future wireless networks: From Internet-of-things to full-duplex,” Ph.D. Thesis, Columbia University, 2020.
[link]
[1]
M. Kohli, T. Chen, M. Baraani 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) (invited), 2020.
[download] [presentation] [video]
[1]
M. Kohli, T. Chen, J. Welles, M. Baraani Dastjerdi, J. Kolodziejski, M. Sherman, I. Seskar, H. Krishnaswamy, and G. Zussman, “Demo: Remote experimentation with open-access full-duplex wireless in the COSMOS testbed,” in Proc. ACM MOBICOM’20, 2020.
[download] [presentation] [video]
[1]
A. Nagulu, A. Gaonkar, S. Ahasan, T. Chen, G. Zussman, and H. Krishnaswamy, “A full-duplex receiver leveraging multiphase switched-capacitor-delay based multi-domain FIR filter cancellers,” in Proc. IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2020.
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[1]
T. Chen, J. Diakonikolas, J. Ghaderi, and G. Zussman, “Hybrid scheduling in heterogeneous half- and full-duplex wireless networks,” IEEE/ACM Transactions on Networking, vol. 28, no. 2, pp. 764–777, Apr. 2020.
[download] [presentation]
[1]
A. Nagulu, T. Chen, G. Zussman, and H. Krishnaswamy, “Non-magnetic 180nm SOI circulator with multi-watt power handling based on switched capacitor clock boosting,” in Proc. IEEE ISSCC’20, 2020.
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[1]
T. Chen, J. Zhou, G. Zussman, and H. Krishnaswamy, “Integrated full-fuplex radios: System concepts, implementations, and experimentation (invited),” in Full-Duplex Communications for Future Wireless Networks (eds: H. Alves, T. Riihonen, and H. Suraweera), Springer, 2020, pp. 299–320.
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[1]
T. Chen, M. Baraani Dastjerdi, J. Welles, J. Zhou, H. Krishnaswamy, and G. Zussman, “Poster: Enabling wideband full-duplex wireless via frequency-domain equalization,” in Poster description in Proc. ACM MOBICOM’19, 2019.
[download] [poster] ACM MobiCom Student Research Competition (SRC) Winner – First Place
[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] [presentation]
[1]
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, 2019.
[download] [presentation]
[1]
T. Chen, M. Baraani Dastjerdi, H. Krishnaswamy, and G. Zussman, “Wideband full-duplex phased array with joint transmit and receive beamforming: optimization and rate gains,” in Proc. ACM MOBIHOC’19, 2019.
[download] [presentation] Best Paper Finalist
[1]
A. Nagulu, T. Chen, G. Zussman, and H. Krishnaswamy, “A full-duplex radio using a CMOS non-magnetic circulator achieving +95 dB overall SIC,” in in Proc. IEEE APS-URSI’19 (invited), 2019.
[download] [presentation]
[1]
A. Nagulu, T. Chen, G. Zussman, and H. Krishnaswamy, “A single antenna full-duplex radio using a non-magnetic, CMOS circulator with in-built isolation tuning,” in Proc. IEEE ICC’19 Workshop on Full-Duplex Communications for Future Wireless Networks (invited), 2019.
[download] [presentation]
[1]
N. Reiskarimian, T. Dinc, J. Zhou, T. Chen, M. Baraani Dastjerdi, J. Diakonikolas, G. Zussman, and H. Krishnaswamy, “A one-way ramp to a two-way highway: Integrated magnetic-free non-reciprocal antenna interfaces for full duplex wireless,” IEEE Microwave, vol. 20, no. 2, pp. 56–75, Feb. 2019.
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[1]
T. Chen, J. Diakonikolas, J. Ghaderi, and G. Zussman, “Fairness and delay in heterogeneous half- and full-duplex wireless networks,” in Proc. Asilomar Conference on Signals, Systems, and Computers (invited), 2018.
[download] [presentation]
[1]
M. Baraani Dastjerdi, T. Chen, N. Reiskarimian, G. Zussman, and H. Krishnaswamy, “Self-interference cancellation via beamforming in an integrated full duplex circulator-receiver phased array,” in Proc. SPCOM 2018, 2018.
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[1]
M. Baraani Dastjerdi, N. Reiskarimian, T. Chen, G. Zussman, and H. Krishnaswamy, “Full duplex circulator-receiver phased array employing self-interference cancellation via beamforming,” in Proc. IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2018.
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[1]
T. Chen, J. Diakonikolas, J. Ghaderi, and G. Zussman, “Hybrid scheduling in heterogeneous half- and full-duplex wireless networks,” in Proc. IEEE INFOCOM’18, 2018.
[download] [presentation]
[1]
T. Chen, M. Baraani Dastjerdi, G. Farkash, J. Zhou, H. Krishnaswamy, and G. Zussman, “Demo Abstract: Open-access full-duplex wireless in the ORBIT testbed,” in Proc. IEEE INFOCOM’18, 2018.
[download] [ORBIT instructions] [code]
[1]
J. Diakonikolas and G. Zussman, “On the rate regions of single-channel and multi-channel full-duplex links,” IEEE/ACM Transactions on Networking, vol. 26, no. 1, pp. 47–60, Feb. 2018.
[download] [presentation]
[1]
T. Chen, J. Zhou, M. Baraani Dastjerdi, J. Diakonikolas, H. Krishnaswamy, and G. Zussman, “Demo abstract: Full-duplex with a compact frequency domain equalization-based RF canceller,” in Proc. IEEE INFOCOM’17, 2017.
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[1]
J. Zhou, N. Reiskarimian, J. Marasevic, T. Dinc, T. Chen, G. Zussman, and H. Krishnaswamy, “Integrated full-duplex radios,” IEEE Communications (invited), vol. 55, no. 4, pp. 142–151, Apr. 2017.
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[1]
J. Marasevic, J. Zhou, H. Krishnaswamy, Y. Zhong, and G. Zussman, “Resource allocation and rate gains in practical full-duplex systems,” IEEE/ACM Transactions on Networking, vol. 25, no. 1, pp. 292–305, Feb. 2017.
[download] [presentation]
[1]
H. Krishnaswamy, G. Zussman, J. Zhou, J. Marasevic, T. Dinc, N. Reiskarimian, and T. Chen, “Full-duplex in a hand-held device - From fundamental physics to complex integrated circuits, systems and networks: An overview of the Columbia FlexICoN project,” in Asilomar Conference on Signals, Systems, and Computers (invited), 2016.
[download] [presentation]
[1]
J. Marasevic, T. Chen, J. Zhou, N. Reiskarimian, H. Krishnaswamy, and G. Zussman, “Full-duplex wireless: Algorithms and rate Improvement bounds for Integrated circuit implementations,” in Proc. ACM HotWireless’16 (invited), 2016.
[download] [presentation]
[1]
J. Marasevic, “Resource allocation in wireless networks: Theory and applications,” Ph.D. Thesis, Columbia University, 2016.
[link]
[1]
T. Chen, J. Zhou, N. Grimwood, R. Fogel, J. Marasevic, H. Krishnaswamy, and G. Zussman, “Demo: Full-duplex wireless based on a small-form-factor analog self-interference canceller,” in Proc. ACM MobiHoc’16, 2016.
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[1]
J. Marasevic and G. Zussman, “On the capacity regions of single-channel and multi-channel full-duplex links,” in Proc. ACM MOBIHOC’16, 2016.
[download] [presentation]
[1]
H. Krishnaswamy and G. Zussman, “1 Chip 2x the bandwidth,” IEEE Spectrum, vol. 53, no. 7, pp. 38–54, Jul. 2016.
[1]
J. Zhou, J. Marasevic, G. Zussman, and H. Krishnaswamy, “Co-design of full-duplex RFIC and resource allocation algorithms,” in IEEE Power Amplifier Symposium, 2015.
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[1]
J. Marasevic, J. Zhou, H. Krishnaswamy, Y. Zhong, and G. Zussman, “Resource allocation and rate gains in practical full-duplex systems,” in Proc. ACM SIGMETRICS’15, 2015.
[download] [presentation]
