no code implementations • 12 May 2025 • Jungbin Yim, Jinseok Choi, Jeonghun Park, Ian P. Roberts, Namyoon Lee
Inter-beam interference poses a significant challenge in low Earth orbit (LEO) satellite communications due to dense satellite constellations.
no code implementations • 19 Mar 2025 • Eunsun Kim, Ian P. Roberts, Taekyun Lee, Jeffrey G. Andrews
We study spectrum sharing between two dense low-earth orbit (LEO) satellite constellations, an incumbent primary system and a secondary system that must respect interference protection constraints on the primary system.
no code implementations • 12 Feb 2025 • Hyunwoo Lee, Ian P. Roberts, Jehyun Heo, Joohyun Son, Hanwoong Kim, Yunseo Lee, Daesik Hong
Frequency-division duplexing (FDD) remains the de facto standard in modern low Earth orbit (LEO) satellite communication (SatCom) systems, such as SpaceX's Starlink, OneWeb, and Amazon's Project Kuiper.
no code implementations • 4 Dec 2024 • Jeong Min Kong, Ian P. Roberts
In this paper, we present a novel active beam learning method for in-band full-duplex wireless systems, that aims to design transmit and receive beams which suppress self-interference and maximize the sum spectral efficiency.
no code implementations • 6 Nov 2024 • Chaeyeon Kim, Joohyun Son, Daesik Hong, Ian P. Roberts
This paper introduces a novel beam tracking scheme for full-duplex ground user terminals aiming to transmit uplink and receive downlink from two low Earth orbit (LEO) satellites at the same time and same frequency.
no code implementations • 6 Nov 2024 • Sungho Cho, Ian P. Roberts
In this work, we present the first analog beamforming codebooks tailored to wideband full-duplex mmWave systems, designed to both combat beam squint and cancel frequency-selective self-interference.
no code implementations • 2 Jul 2024 • Sidharth Thomas, Jaskirat Singh Virdi, Aydin Babakhani, Ian P. Roberts
Terahertz (THz) carrier frequencies (100 GHz to 10 THz) have been touted as a source for unprecedented wireless connectivity and high-precision sensing, courtesy of their wide bandwidth availability and small wavelengths, but noteworthy implementation challenges remain to make this a reality.
no code implementations • 17 Mar 2024 • Hyowon Lee, Jungyeon Kim, Geon Choi, Ian P. Roberts, Jinseok Choi, Namyoon Lee
In this paper, we propose a novel algorithm for nonlinear digital SIC that adaptively constructs orthonormal polynomial basis functions according to the non-stationary moments of the transmit signal.
no code implementations • 25 Jan 2024 • Ao Liu, Ian P. Roberts, Taneli Riihonen, Weixing Sheng
This letter develops a novel transmit beamforming (BF) design for canceling self-interference (SI) in analog in-band full-duplex phased arrays.
no code implementations • 30 Nov 2023 • Eunsun Kim, Ian P. Roberts, Jeffrey G. Andrews
We carefully model and study the potential downlink interference between the two systems and investigate how strategic satellite selection may be used by Kuiper to serve its ground users while also protecting Starlink ground users.
no code implementations • 20 Jul 2023 • Ian P. Roberts, Yu Zhang, Tawfik Osman, Ahmed Alkhateeb
Noteworthy strides continue to be made in the development of full-duplex millimeter wave (mmWave) communication systems, but most of this progress has been built on theoretical models and validated through simulation.
no code implementations • 14 Oct 2022 • Ian P. Roberts, Aditya Chopra, Thomas Novlan, Sriram Vishwanath, Jeffrey G. Andrews
Characterizing self-interference is essential to the design and evaluation of in-band full-duplex communication systems.
no code implementations • 14 Oct 2022 • Ian P. Roberts, Himal A. Suraweera
Wireless communication systems can be enhanced at the link level, in medium access, and at the network level when transceivers are equipped with full-duplex capability: the transformative ability to simultaneously transmit and receive over the same frequency spectrum.
no code implementations • 15 Jul 2022 • Ian P. Roberts, Aditya Chopra, Thomas Novlan, Sriram Vishwanath, Jeffrey G. Andrews
Modern millimeter wave (mmWave) communication systems rely on beam alignment to deliver sufficient beamforming gain to close the link between devices.
no code implementations • 14 Jul 2022 • Eunsun Kim, Ian P. Roberts, Jeffrey G. Andrews
The extension of wide area wireless connectivity to low-earth orbit (LEO) satellite communication systems demands a fresh look at the effects of in-orbit base stations, sky-to-ground propagation, and cell planning.
1 code implementation • 22 Jun 2022 • Ian P. Roberts, Sriram Vishwanath, Jeffrey G. Andrews
This work develops LoneSTAR, a novel enabler of full-duplex millimeter wave (mmWave) communication systems through the design of analog beamforming codebooks.
no code implementations • 15 Jun 2022 • Ian P. Roberts, Aditya Chopra, Thomas Novlan, Sriram Vishwanath, Jeffrey G. Andrews
We present measurements and analysis of self-interference in multi-panel millimeter wave (mmWave) full-duplex communication systems at 28 GHz.
no code implementations • 5 Mar 2022 • Aditya Chopra, Ian P. Roberts, Thomas Novlan, Jeffrey G. Andrews
We present measurements of the 28 GHz self-interference channel for full-duplex sectorized multi-panel millimeter wave (mmWave) systems, such as integrated access and backhaul.
no code implementations • 10 Dec 2021 • Manan Gupta, Ian P. Roberts, Jeffrey G. Andrews
We use this to characterize the network-level improvements seen when upgrading from conventional HD IAB nodes to FD ones by deriving closed-form expressions for (i) latency gain of FD-IAB over HD-IAB and (ii) the maximum number of hops that a HD- and FD-IAB network can support while satisfying latency and throughput targets.
no code implementations • 9 Nov 2021 • Ian P. Roberts
We present MIMO FOR MATLAB (MFM), a toolbox for MATLAB that aims to simplify the simulation of multiple-input multiple-output (MIMO) communication systems research while facilitating reproducibility, consistency, and community-driven customization.
no code implementations • 29 Jul 2021 • Eunsun Kim, Ian P. Roberts, Peter A. Iannucci, Jeffrey G. Andrews
The coming extension of cellular technology to base-stations in low-earth orbit (LEO) requires a fresh look at terrestrial 3GPP channel models.
no code implementations • 27 May 2021 • Ian P. Roberts, Hardik B. Jain, Sriram Vishwanath, Jeffrey G. Andrews
This paper develops a novel methodology for designing analog beamforming codebooks for full-duplex millimeter wave (mmWave) transceivers, the first such codebooks to the best of our knowledge.
no code implementations • 21 Dec 2020 • Ian P. Roberts, Jeffrey G. Andrews, Sriram Vishwanath
To prevent self-interference from saturating the receiver of a full-duplex device having limited dynamic range, our design addresses saturation on a per-antenna and per-RF chain basis.
no code implementations • 13 Sep 2020 • Ian P. Roberts, Jeffrey G. Andrews, Hardik B. Jain, Sriram Vishwanath
Equipping millimeter wave (mmWave) systems with full-duplex capability would accelerate and transform next-generation wireless applications and forge a path for new ones.
no code implementations • 18 Aug 2019 • Ian P. Roberts, Sriram Vishwanath
In recent years, there has been extensive research on millimeter-wave (mmWave) communication and on in-band full-duplex (FD) communication, but work on the combination of the two is relatively lacking.