Search Results for author: Ian P. Roberts

Found 25 papers, 1 papers with code

Space-Time Beamforming for LEO Satellite Communications

no code implementations12 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.

Management

Satellite Selection for In-Band Coexistence of Dense LEO Networks

no code implementations19 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.

Can TDD Be Employed in LEO SatCom Systems? Challenges and Potential Approaches

no code implementations12 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.

Active Beam Learning for Full-Duplex Wireless Systems

no code implementations4 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.

Beam Tracking for Full-Duplex User Terminals in Low Earth Orbit Satellite Communication Systems

no code implementations6 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.

Analog Beamforming Codebooks for Wideband Full-Duplex Millimeter-Wave Systems

no code implementations6 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.

A Survey on Advancements in THz Technology for 6G: Systems, Circuits, Antennas, and Experiments

no code implementations2 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.

Nonlinear Self-Interference Cancellation With Learnable Orthonormal Polynomials for Full-Duplex Wireless Systems

no code implementations17 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.

Analog Beamforming for In-Band Full-Duplex Phased Arrays with Quantized Phase Shifters under a Per-Antenna Received Power Constraint

no code implementations25 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.

Feasibility Analysis of In-Band Coexistence in Dense LEO Satellite Communication Systems

no code implementations30 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.

Real-World Evaluation of Full-Duplex Millimeter Wave Communication Systems

no code implementations20 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.

Spatial and Statistical Modeling of Multi-Panel Millimeter Wave Self-Interference

no code implementations14 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.

Full-Duplex Transceivers for Next-Generation Wireless Communication Systems

no code implementations14 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.

STEER: Beam Selection for Full-Duplex Millimeter Wave Communication Systems

no code implementations15 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.

Downlink Analysis and Evaluation of Multi-Beam LEO Satellite Communication in Shadowed Rician Channels

no code implementations14 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.

LoneSTAR: Analog Beamforming Codebooks for Full-Duplex Millimeter Wave Systems

1 code implementation22 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.

Beamformed Self-Interference Measurements at 28 GHz: Spatial Insights and Angular Spread

no code implementations15 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.

28 GHz Phased Array-Based Self-Interference Measurements for Millimeter Wave Full-Duplex

no code implementations5 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.

System-Level Analysis of Full-Duplex Self-Backhauled Millimeter Wave Networks

no code implementations10 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.

MIMO for MATLAB: A Toolbox for Simulating MIMO Communication Systems

no code implementations9 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.

Downlink Analysis of LEO Multi-Beam Satellite Communication in Shadowed Rician Channels

no code implementations29 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.

Millimeter Wave Analog Beamforming Codebooks Robust to Self-Interference

no code implementations27 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.

Hybrid Beamforming for Millimeter Wave Full-Duplex under Limited Receive Dynamic Range

no code implementations21 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.

Millimeter Wave Full-Duplex Radios: New Challenges and Techniques

no code implementations13 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.

Management

Beamforming Cancellation Design for Millimeter-Wave Full-Duplex

no code implementations18 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.

Cannot find the paper you are looking for? You can Submit a new open access paper.