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B6GS Full-Duplex.mp4According to the Ericsson Mobility Report (June 2025), mobile network traffic is expected to more than double by 2030, growing to 430 million terabytes transmitted to and from mobile devices. This exponential growth poses significant challenges and calls for the design of spectrum-efficient methods at all layers of the protocol stack. Existing wireless systems, which are predominantly half-duplex, are inherently inefficient in their utilization of limited resources due to the underlying separation (in either frequency or time) of users’ transmitted and received signals.
Full-duplex communication, the simultaneous transmission and reception of wireless signals on the same frequency channel, is an emerging and transformative technology that can substantially improve spectrum efficiency.
As part of the Full-duplex Wireless: From Integrated Circuits to Networks (FlexICoN) project, we are working to bring full-duplex wireless closer to real-world, practical implementation, developing the technology from nodes to networks and evaluating its performance and benefits.
Self-Interference Cancellation
Self-Interference Cancellation
A significant obstacle to practical full-duplex communication is the presence of strong self-interference (SI) — the signal leaking from a radio's own transmitter into its receiver. This SI is typically 90–120 dB stronger than the desired incoming signal, undergoes substantial frequency dispersion, and varies with the electromagnetic environment, requiring cancellation that is both high-performance and adaptive. Achieving the necessary suppression levels demands a multidomain approach, spanning antenna isolation, analog cancellation, and digital algorithms.
Communication Stack Integration
Communication Stack Integration
Realizing full-duplex in practice requires more than cancellation hardware — it demands a complete software-defined communication stack capable of coordinating transmit and receive signal chains, estimating and tracking the SI channel, applying digital cancellation, and managing various system states. Implementing such a stack requires tight integration between signal processing, packet handling, canceller control, and the underlying FD frontend hardware — all within a unified, reproducible platform for full-duplex experimentation.
A complete adaptive full-duplex transceiver requires multidomain self-interference cancellation — spanning analog and digital stages — within a co-designed hardware and software framework, coordinating signal processing, channel estimation, and adaptive control across the full stack.
My doctoral research at Columbia University's WiMNet Lab, under the supervision of Prof. Gil Zussman, approaches full-duplex wireless from a full-stack systems perspective, from circuits to software.
My doctoral research at Columbia University's WiMNet Lab, under the supervision of Prof. Gil Zussman, approaches full-duplex wireless from a full-stack systems perspective, from circuits to software.
At the hardware level, this work centers on integrating and controlling a state-of-the-art programmable IC analog canceller — a chip with over 10¹⁹ possible configurations — into a complete, real-time adaptive full-duplex radio capable of transmitting data over an actual wireless link and sustaining cancellation as the SI channel evolves. At the software level, this work develops the GNU Radio infrastructure needed to operate IC-based full-duplex radios — from signal processing and channel estimation to system control and hardware interfacing — toward an open, reproducible platform for full-duplex research. Together, these contributions have been demonstrated in experimental settings and presented at leading venues in the wireless networking community.
Relevant Works
Relevant Works
[J01] Doubling Down on Wireless Capacity: A Review of Integrated Circuits, Systems, and Networks for Full-Duplex
[J01] Doubling Down on Wireless Capacity: A Review of Integrated Circuits, Systems, and Networks for Full-Duplex
A. Nagulu, N. Reiskarimian, T. Chen, S. Garikapati, I. Kadota, T. Dinc, S. Garimella, M. Kohli, A. S. Levin, G. Zussman, H. Krishnaswamy
Proceedings of the IEEE, 2024
🔗 [Publication] · [PDF]
[C01] Enabling Integrated Circuit-Based Full-Duplex Wireless in GNU Radio
[C01] Enabling Integrated Circuit-Based Full-Duplex Wireless in GNU Radio
A. S. Levin, M. Kohli, I. Kadota, T. Chen, S. Garikapati, A. Nagulu, M. Baraani Dastjerdi, J. Zhou, I. Seskar, H. Krishnaswamy, G. Zussman
Proceedings of the GNU Radio Conference, 2024
🔗 [Publication] · [PDF] · [Slides] · [Video]
[A02] Demo: Achieving Self-Interference Cancellation Across Different Environments
[A02] Demo: Achieving Self-Interference Cancellation Across Different Environments
A. S. Levin, E. Flores Portillo, S. Garikapati, A. M. Bechhofer, B. Zhang, M. Kohli, I. Kadota, H. Krishnaswamy, M. Seok, G. Zussman
ACM MobiCom, 2024
🔗 [Publication] · [PDF] · [Poster]
[A01] Demo: Experimentation with Wideband Real-Time Adaptive Full-Duplex Radios
[A01] Demo: Experimentation with Wideband Real-Time Adaptive Full-Duplex Radios
A. S. Levin, I. Kadota, S. Garikapati, B. Zhang, A. Jolly, M. Kohli, M. Seok, H. Krishnaswamy, G. Zussman
ACM SIGCOMM, 2023
🔗[Publication] · [PDF] · [Poster]
🔁 Connections: [S05]
🏆 Award: Student Research Competition (SRC) Winner – First Place
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