Search Results for author: A. Lee Swindlehurst

Found 66 papers, 4 papers with code

Semi-Blind Channel Estimation for Downlink Communications Based on Dynamic Metasurface Antennas

no code implementations14 Jun 2025 Amarilton L. Magalhães, André L. F. de Almeida, A. Lee Swindlehurst

Dynamic metasurface antennas (DMAs) are emerging as a promising technology to enable energy-efficient, large array-based multi-antenna systems.

Near-Field Secure Beamfocusing With Receiver-Centered Protected Zone

no code implementations26 May 2025 Cen Liu, Xiangyun Zhou, Nan Yang, Salman Durrani, A. Lee Swindlehurst

To this end, we consider secure communications through the creation of a virtual protected zone using a full-duplex legitimate receiver.

Simultaneously Exposing and Jamming Covert Communications via Disco Reconfigurable Intelligent Surfaces

no code implementations18 May 2025 Huan Huang, Hongliang Zhang, Yi Cai, Dusit Niyato, A. Lee Swindlehurst, Zhu Han

Then, we define the detection error probabilities, i. e., the false alarm rate (FAR) and the missed detection rate (MDR), as the monitoring performance metrics for Willie's detections, and the signal-to-jamming-plusnoise ratio (SJNR) as a communication performance metric for the covert transmissions between Alice and Bob.

A Tutorial on MIMO-OFDM ISAC: From Far-Field to Near-Field

no code implementations27 Apr 2025 Qianglong Dai, Yong Zeng, Huizhi Wang, Changsheng You, Chao Zhou, Hongqiang Cheng, Xiaoli Xu, Shi Jin, A. Lee Swindlehurst, Yonina C. Eldar, Robert Schober, Rui Zhang, Xiaohu You

Integrated sensing and communication (ISAC) is one of the key usage scenarios for future sixth-generation (6G) mobile communication networks, where communication and sensing (C&S) services are simultaneously provided through shared wireless spectrum, signal processing modules, hardware, and network infrastructure.

Integrated sensing and communication ISAC +1

Exploiting Symmetric Non-Convexity for Multi-Objective Symbol-Level DFRC Signal Design

no code implementations19 Apr 2025 Ly V. Nguyen, Rang Liu, Nhan Thanh Nguyen, Markku Juntti, Björn Ottersten, A. Lee Swindlehurst

We refer to this as symmetric-rotation invariance, upon which we develop low-complexity yet efficient DFRC signal design algorithms.

Sensing-Oriented Adaptive Resource Allocation Designs for OFDM-ISAC Systems

no code implementations9 Apr 2025 Peishi Li, Ming Li, Rang Liu, Qian Liu, A. Lee Swindlehurst

In this paper, we propose adaptive resource allocation strategies for OFDM-ISAC systems to achieve optimal trade-offs between diverse sensing requirements and communication quality-of-service (QoS).

Integrated sensing and communication ISAC

Byzantine-Resilient Over-the-Air Federated Learning under Zero-Trust Architecture

no code implementations24 Mar 2025 Jiacheng Yao, Wei Shi, Wei Xu, Zhaohui Yang, A. Lee Swindlehurst, Dusit Niyato

To facilitate the targeted optimization, we propose a dynamic Byzantine identification method using historical reputation based on ZTA.

Clustering Federated Learning

Joint Array Partitioning and Beamforming Designs in ISAC Systems: A Bayesian CRB Perspective

no code implementations18 Mar 2025 Rang Liu, Ming Li, A. Lee Swindlehurst

Building on this, we formulate a joint optimization framework for transmit beamforming and dynamic array partitioning to minimize the derived BCRBs for direction-of-arrival (DOA) estimation.

Integrated sensing and communication ISAC

Intelligent Reflecting Surface-Aided Electromagnetic Stealth over Extended Regions

no code implementations7 Mar 2025 Qingjie Wu, Beixiong Zheng, Guangchi Zhang, Derrick Wing Kwan Ng, A. Lee Swindlehurst

Compared to traditional electromagnetic stealth (ES) materials, which are effective only within specific frequencies and orientations, intelligent reflecting surface (IRS) technology introduces a novel paradigm for achieving dynamic and adaptive ES by adapting its reflection pattern in real time to neutralize radar probing signals echoed back from the target.

Channel Estimation for RIS-Aided MU-MIMO mmWave Systems with Practical Hybrid Architecture

no code implementations8 Feb 2025 Liuchang Zhuo, Cunhua Pan, Hong Ren, Ruisong Weng, Shi Jin, A. Lee Swindlehurst, Jiangzhou Wang

Based on the observation that the overall cascaded MIMO channel can be decomposed into multiple sub-channels, the cascaded channel for a typical user is estimated in Stage II.

Compressive Sensing

RIS-Assisted Sensing: A Nested Tensor Decomposition-Based Approach

no code implementations3 Dec 2024 Kenneth Benício, Fazal-E-Asim, Bruno Sokal, André L. F. de Almeida, Behrooz Makki, Gabor Fodor, A. Lee Swindlehurst

We study a monostatic multiple-input multiple-output sensing scenario assisted by a reconfigurable intelligent surface using tensor signal modeling.

Tensor Decomposition

Deep Unfolding-Empowered MmWave Massive MIMO Joint Communications and Sensing

no code implementations25 Nov 2024 Nhan Thanh Nguyen, Ly V. Nguyen, Nir Shlezinger, Yonina C. Eldar, A. Lee Swindlehurst, Markku Juntti

We first derive closed-form expressions for the gradients of the communications sum rate and sensing beampattern error with respect to the analog and digital precoders.

Non-Reciprocal Reconfigurable Intelligent Surfaces

no code implementations23 Nov 2024 Jiaqi Xu, Haoyu Wang, Rang Liu, Josef A. Nossek, A. Lee Swindlehurst

In contrast to conventional RIS, the scattering matrix of a non-reciprocal RIS (NR-RIS) is non-symmetric, leading to differences in the uplink and the downlink components of NR-RIS cascaded channels.

Performance Analysis and Power Allocation for Massive MIMO ISAC Systems

no code implementations16 Nov 2024 Nhan Thanh Nguyen, Van-Dinh Nguyen, Hieu V. Nguyen, Hien Quoc Ngo, A. Lee Swindlehurst, Markku Juntti

Furthermore, we devise a power allocation strategy based on successive convex approximation to maximize the communications rate while guaranteeing the CRLB constraints and transmit power budget.

ISAC

CRB Optimization using a Parametric Scattering Model for Extended Targets in ISAC Systems

no code implementations31 Oct 2024 Rang Liu, A. Lee Swindlehurst, Ming Li

This paper presents a novel parametric scattering model (PSM) for sensing extended targets in integrated sensing and communication (ISAC) systems.

Integrated sensing and communication ISAC +1

Channel-Coded Precoding for Multi-User MISO Systems

no code implementations30 Oct 2024 Ly V. Nguyen, Junil Choi, Bjorn Ottersten, A. Lee Swindlehurst

In this paper, we consider the precoding problem in multi-user multiple-input single-output (MISO) systems, incorporating channel coding into the design.

RIS-Aided Dual-Polarized MIMO: How Large a Surface is Needed to Beat Single Polarization?

no code implementations30 Oct 2024 Zizhou Zheng, Huan Huang, Hongliang Zhang, A. Lee Swindlehurst

Dual-polarized (DP) multiple-input-multiple-output (MIMO) systems have been widely adopted in commercial mobile wireless communications.

Diversity

DOA Estimation-Oriented Joint Array Partitioning and Beamforming Designs for ISAC Systems

no code implementations16 Oct 2024 Rang Liu, Ming Li, Qian Liu, A. Lee Swindlehurst

Integrated sensing and communication has been identified as an enabling technology for forthcoming wireless networks.

Integrated sensing and communication ISAC

Meta-Learning-Driven Adaptive Codebook Design for Near-Field Communications

no code implementations10 Oct 2024 Mianyi Zhang, Yunlong Cai, Jiaqi Xu, A. Lee Swindlehurst

Specifically, we first design a deep neural network (DNN) to learn the near-field codebook.

Meta-Learning

MIMO Detection with Spatial Sigma-Delta ADCs: A Variational Bayesian Approach

no code implementations4 Oct 2024 Toan-Van Nguyen, Sajjad Nassirpour, Italo Atzeni, Antti Tolli, A. Lee Swindlehurst, Duy H. N. Nguyen

The effects of the steering angle of the $\Sigma\Delta$ architecture, the number of ADC resolution bits, and the number of antennas and users are also extensively analyzed.

Quantization

Digital and Hybrid Precoding Designs in Massive MIMO with Low-Resolution ADCs

no code implementations26 Sep 2024 Mengyuan Ma, Nhan Thanh Nguyen, Italo Atzeni, A. Lee Swindlehurst, Markku Juntti

Low-resolution analog-to-digital converters (ADCs) have emerged as an efficient solution for massive multiple-input multiple-output (MIMO) systems to reap high data rates with reasonable power consumption and hardware complexity.

Quantization

Symbol Level Precoding for Systems with Improper Gaussian Interference

no code implementations11 Sep 2024 Lu Liu, Rang Liu, Ly V. Nguyen, A. Lee Swindlehurst

This paper focuses on precoding design in multi-antenna systems with improper Gaussian interference (IGI), characterized by correlated real and imaginary parts.

Design and Operation Principles of a Wave-Controlled Reconfigurable Intelligent Surface

no code implementations3 Sep 2024 Gal Ben Itzhak, Miguel Saavedra-Melo, Benjamin Bradshaw, Ender Ayanoglu, Filippo Capolino, A. Lee Swindlehurst

A potential solution to this problem was previously proposed by the authors in which "biasing transmission lines" carrying standing waves are sampled at each RIS location to produce the desired bias voltage for each RIS element.

Optimality of the Bussgang Linear MMSE Channel Estimator for MIMO Systems with 1-Bit ADCs

no code implementations18 Jul 2024 Minhua Ding, Italo Atzeni, Antti Tölli, A. Lee Swindlehurst

We compare the BLMMSE with the optimal minimum mean squared error (MMSE) channel estimator, which is generally non-linear, and we develop a novel framework based on the orthant probability of a multivariate normal distribution to compute the MMSE channel estimate.

MIMO-OFDM ISAC Waveform Design for Range-Doppler Sidelobe Suppression

no code implementations25 Jun 2024 Peishi Li, Ming Li, Rang Liu, Qian Liu, A. Lee Swindlehurst

In addition, the proposed waveform design achieves target detection and estimation performance close to that achievable by waveforms designed only for radar, which demonstrates the superiority of the proposed SLP-based ISAC approach.

Integrated sensing and communication ISAC

Enhanced Automotive Radar Collaborative Sensing By Exploiting Constructive Interference

no code implementations27 May 2024 Lifan Xu, Shunqiao Sun, A. Lee Swindlehurst

This approach considerably decreases the data bandwidth requirements for the wireless channel, making it a more feasible and practical solution for automotive radar collaboration.

object-detection Object Detection

Intelligent Reflecting Surface-Enabled Anti-Detection for Secure Sensing and Communications

no code implementations12 Apr 2024 Beixiong Zheng, Xue Xiong, Tiantian Ma, Jie Tang, Derrick Wing Kwan Ng, A. Lee Swindlehurst, Rui Zhang

The ever-increasing reliance on wireless communication and sensing has led to growing concerns over the vulnerability of sensitive information to unauthorized detection and interception.

A New Intelligent Reflecting Surface-Aided Electromagnetic Stealth Strategy

no code implementations19 Mar 2024 Xue Xiong, Beixiong Zheng, A. Lee Swindlehurst, Jie Tang, Wen Wu

Electromagnetic wave absorbing material (EWAM) plays an essential role in manufacturing stealth aircraft, which can achieve the electromagnetic stealth (ES) by reducing the strength of the signal reflected back to the radar system.

Feature Allocation for Semantic Communication with Space-Time Importance Awareness

no code implementations26 Jan 2024 Kequan Zhou, Guangyi Zhang, Yunlong Cai, Qiyu Hu, Guanding Yu, A. Lee Swindlehurst

To tackle this challenge, we introduce a framework called Feature Allocation for Semantic Transmission (FAST), which offers adaptability to channel fluctuations across both spatial and temporal domains.

Attribute Semantic Communication

Near-Field Communications: A Comprehensive Survey

no code implementations11 Jan 2024 Yuanwei Liu, Chongjun Ouyang, Zhaolin Wang, Jiaqi Xu, Xidong Mu, A. Lee Swindlehurst

Throughout this paper, promising directions are highlighted to inspire future research endeavors in the realm of NFC, underscoring its significance in the advancement of wireless communication technologies.

Survey

RIS-Aided Interference Cancellation for Joint Device-to-Device and Cellular Communications

no code implementations7 Dec 2023 Ly V. Nguyen, A. Lee Swindlehurst

This paper considers an RIS-aided joint D2D and cellular communication system where the RIS is exploited to cancel interference to the D2D links and maximize the minimum signal-to-interference plus noise (SINR) of the device pairs and cellular users.

Doubly 1-Bit Quantized Massive MIMO

no code implementations4 Dec 2023 Italo Atzeni, Antti Tölli, Duy H. N. Nguyen, A. Lee Swindlehurst

Enabling communications in the (sub-)THz band will call for massive multiple-input multiple-output (MIMO) arrays at either the transmit- or receive-side, or at both.

DISCO Might Not Be Funky: Random Intelligent Reflective Surface Configurations That Attack

1 code implementation1 Oct 2023 Huan Huang, Lipeng Dai, Hongliang Zhang, Chongfu Zhang, Zhongxing Tian, Yi Cai, A. Lee Swindlehurst, Zhu Han

Unlike the extensive research on legitimate IRS-enhanced communications, in this article we present an adversarial IRS-based fully-passive jammer (FPJ).

Decision-Directed Hybrid RIS Channel Estimation with Minimal Pilot Overhead

no code implementations20 Sep 2023 Ly V. Nguyen, A. Lee Swindlehurst

We also perform a detailed spectral efficiency analysis for both the pilot-directed and decision-directed frameworks.

Channel Reciprocity Attacks Using Intelligent Surfaces with Non-Diagonal Phase Shifts

no code implementations20 Sep 2023 Haoyu Wang, Zhu Han, A. Lee Swindlehurst

While reconfigurable intelligent surface (RIS) technology has been shown to provide numerous benefits to wireless systems, in the hands of an adversary such technology can also be used to disrupt communication links.

Anti-Jamming Precoding Against Disco Intelligent Reflecting Surfaces Based Fully-Passive Jamming Attacks

no code implementations30 Aug 2023 Huan Huang, Lipeng Dai, Hongliang Zhang, Zhongxing Tian, Yi Cai, Chongfu Zhang, A. Lee Swindlehurst, Zhu Han

Numerical results are also presented to evaluate the effectiveness of the proposed anti-jamming precoder against the DIRS-based FPJs and the feasibility of the designed data frame used by the legitimate AP to estimate the statistical characteristics.

A Novel Joint Angle-Range-Velocity Estimation Method for MIMO-OFDM ISAC Systems

no code implementations7 Aug 2023 Zichao Xiao, Rang Liu, Ming Li, Qian Liu, A. Lee Swindlehurst

The proposed joint estimation algorithm can achieve larger signal-to-noise-ratio (SNR) processing gains and higher resolution by fully exploiting the echo signals and jointly estimating the angle-range-velocity information.

Integrated sensing and communication ISAC

An Anti-Jamming Strategy for Disco Intelligent Reflecting Surfaces Based Fully-Passive Jamming Attacks

no code implementations7 Jul 2023 Huan Huang, Hongliang Zhang, Yi Cai, A. Lee Swindlehurst, Zhu Han

Emerging intelligent reflecting surfaces (IRSs) significantly improve system performance, while also pose a huge risk for physical layer security.

Near-Field Beam Management for Extremely Large-Scale Array Communications

no code implementations28 Jun 2023 Changsheng You, Yunpu Zhang, Chenyu Wu, Yong Zeng, Beixiong Zheng, Li Chen, Linglong Dai, A. Lee Swindlehurst

Extremely large-scale arrays (XL-arrays) have emerged as a promising technology to achieve super-high spectral efficiency and spatial resolution in future wireless systems.

Management Scheduling

SCA-Based Beamforming Optimization for IRS-Enabled Secure Integrated Sensing and Communication

no code implementations5 May 2023 Vaibhav Kumar, Marwa Chafii, A. Lee Swindlehurst, Le-Nam Tran, Mark F. Flanagan

Integrated sensing and communication (ISAC) is expected to be offered as a fundamental service in the upcoming sixth-generation (6G) communications standard.

Integrated sensing and communication ISAC

One-Bit Massive MIMO Precoding for Frequency-Selective Fading Channels

no code implementations20 Mar 2023 Ly V. Nguyen, Lu Liu, Nguyen Linh-Trung, A. Lee Swindlehurst

While block-wise processing (BWP) can effectively address the inter-symbol-interference (ISI) in frequency-selective fading channels, its computational complexity and processing delay can be too high for practical implementation.

Disco Intelligent Reflecting Surfaces: Active Channel Aging for Fully-Passive Jamming Attacks

no code implementations1 Feb 2023 Huan Huang, Ying Zhang, Hongliang Zhang, Yi Cai, A. Lee Swindlehurst, Zhu Han

A theoretical analysis of the proposed DIRS-based FPJ that provides an evaluation of the DIRS-based jamming attacks is derived.

Quantization

SNR/CRB-Constrained Joint Beamforming and Reflection Designs for RIS-ISAC Systems

1 code implementation26 Jan 2023 Rang Liu, Ming Li, Qian Liu, A. Lee Swindlehurst

Two optimization problems are formulated for maximizing the achievable sum-rate of the multi-user communications under an SNR constraint for target detection or a CRB constraint for parameter estimation, the transmit power budget, and the unit-modulus constraint of the RIS reflection coefficients.

Integrated sensing and communication ISAC +1

Robust Symbol Level Precoding for Overlay Cognitive Radio Networks

no code implementations20 Jan 2023 Lu Liu, Christos Masouros, A. Lee Swindlehurst

This paper focuses on designing robust symbol-level precoding (SLP) in an overlay cognitive radio (CR) network, where the primary and secondary networks transmit signals concurrently.

Philosophy Quantization

Disentangled Representation Learning for RF Fingerprint Extraction under Unknown Channel Statistics

1 code implementation4 Aug 2022 Renjie Xie, Wei Xu, Jiabao Yu, Aiqun Hu, Derrick Wing Kwan Ng, A. Lee Swindlehurst

Deep learning (DL) applied to a device's radio-frequency fingerprint~(RFF) has attracted significant attention in physical-layer authentication due to its extraordinary classification performance.

Data Augmentation Representation Learning

Integrated Sensing and Communication with Reconfigurable Intelligent Surfaces: Opportunities, Applications, and Future Directions

no code implementations17 Jun 2022 Rang Liu, Ming Li, Honghao Luo, Qian Liu, A. Lee Swindlehurst

Integrated sensing and communication (ISAC) is emerging as a key enabler to address the growing spectrum congestion problem and satisfy increasing demands for ubiquitous sensing and communication.

Integrated sensing and communication ISAC

A Variational Bayesian Perspective on Massive MIMO Detection

no code implementations23 May 2022 Duy H. N. Nguyen, Italo Atzeni, Antti Tölli, A. Lee Swindlehurst

In this paper, we build upon variational Bayes (VB) inference to design low-complexity multiuser detection algorithms for massive MIMO systems.

Leveraging Deep Neural Networks for Massive MIMO Data Detection

no code implementations11 Apr 2022 Ly V. Nguyen, Nhan T. Nguyen, Nghi H. Tran, Markku Juntti, A. Lee Swindlehurst, Duy H. N. Nguyen

Massive multiple-input multiple-output (MIMO) is a key technology for emerging next-generation wireless systems.

Joint Beamforming and Reflection Design for RIS-assisted ISAC Systems

no code implementations1 Mar 2022 Rang Liu, Ming Li, A. Lee Swindlehurst

In this paper, we investigate the potential of employing reconfigurable intelligent surface (RIS) in integrated sensing and communication (ISAC) systems.

Integrated sensing and communication ISAC

Wave-Controlled Metasurface-Based Reconfigurable Intelligent Surfaces

no code implementations2 Feb 2022 Ender Ayanoglu, Filippo Capolino, A. Lee Swindlehurst

Reconfigurable Intelligent Surfaces (RISs) are programmable metasurfaces that can adaptively steer received electromagnetic energy in desired directions by employing controllable phase shifting cells.

An Overview of Signal Processing Techniques for RIS/IRS-aided Wireless Systems

no code implementations11 Dec 2021 Cunhua Pan, Gui Zhou, Kangda Zhi, Sheng Hong, Tuo Wu, Yijin Pan, Hong Ren, Marco Di Renzo, A. Lee Swindlehurst, Rui Zhang, Angela Yingjun Zhang

In the past as well as present wireless communication systems, the wireless propagation environment is regarded as an uncontrollable black box that impairs the received signal quality, and its negative impacts are compensated for by relying on the design of various sophisticated transmission/reception schemes.

Dual-Functional Radar-Communication Waveform Design: A Symbol-Level Precoding Approach

no code implementations11 Aug 2021 Rang Liu, Ming Li, Qian Liu, A. Lee Swindlehurst

In this paper, we consider multi-input multi-output (MIMO) DFRC systems and focus on transmit beamforming designs to provide both radar sensing and multi-user communications.

A Generalizable Model-and-Data Driven Approach for Open-Set RFF Authentication

1 code implementation10 Aug 2021 Renjie Xie, Wei Xu, Yanzhi Chen, Jiabao Yu, Aiqun Hu, Derrick Wing Kwan Ng, A. Lee Swindlehurst

To enable the discrimination of RFF from both known and unknown devices, we propose a new end-to-end deep learning framework for extracting RFFs from raw received signals.

Inductive Bias

Deep Learning for Estimation and Pilot Signal Design in Few-Bit Massive MIMO Systems

no code implementations26 Jul 2021 Ly V. Nguyen, Duy H. N. Nguyen, A. Lee Swindlehurst

In this paper, we propose a deep learning framework for channel estimation, data detection, and pilot signal design to address the nonlinearity in such systems.

Quantization

Channel Estimation for RIS-Aided Multiuser Millimeter-Wave Systems

no code implementations28 Jun 2021 Gui Zhou, Cunhua Pan, Hong Ren, Petar Popovski, A. Lee Swindlehurst

In the first coherence block, we propose a two-phase channel estimation method, in which the cascaded channel of one typical user is estimated in Phase I based on the linear correlation among cascaded paths, while the cascaded channels of other users are estimated in Phase II by utilizing the partial CSI of the common base station (BS)-RIS channel obtained in Phase I.

Machine Learning-based Reconfigurable Intelligent Surface-aided MIMO Systems

no code implementations1 May 2021 Nhan Thanh Nguyen, Ly V. Nguyen, Thien Huynh-The, Duy H. N. Nguyen, A. Lee Swindlehurst, Markku Juntti

Reconfigurable intelligent surface (RIS) technology has recently emerged as a spectral- and cost-efficient approach for wireless communications systems.

BIG-bench Machine Learning

Reconfigurable Intelligent Surfaces for 6G Systems: Principles, Applications, and Research Directions

no code implementations9 Nov 2020 Cunhua Pan, Hong Ren, Kezhi Wang, Jonas Florentin Kolb, Maged Elkashlan, Ming Chen, Marco Di Renzo, Yang Hao, Jiangzhou Wang, A. Lee Swindlehurst, Xiaohu You, Lajos Hanzo

Reconfigurable intelligent surfaces (RISs) or intelligent reflecting surfaces (IRSs), are regarded as one of the most promising and revolutionizing techniques for enhancing the spectrum and/or energy efficiency of wireless systems.

DNN-based Detectors for Massive MIMO Systems with Low-Resolution ADCs

no code implementations5 Nov 2020 Ly V. Nguyen, Duy H. N. Nguyen, A. Lee Swindlehurst

Low-resolution analog-to-digital converters (ADCs) have been considered as a practical and promising solution for reducing cost and power consumption in massive Multiple-Input-Multiple-Output (MIMO) systems.

A Comprehensive Overview on 5G-and-Beyond Networks with UAVs: From Communications to Sensing and Intelligence

no code implementations19 Oct 2020 Qingqing Wu, Jie Xu, Yong Zeng, Derrick Wing Kwan Ng, Naofal Al-Dhahir, Robert Schober, A. Lee Swindlehurst

On the other hand, providing such communication services simultaneously for both UAV and ground users poses new challenges due to the need for ubiquitous 3D signal coverage as well as the strong air-ground network interference.

Linear and Deep Neural Network-based Receivers for Massive MIMO Systems with One-Bit ADCs

no code implementations9 Aug 2020 Ly V. Nguyen, A. Lee Swindlehurst, Duy H. N. Nguyen

Based on the reformulated ML detection problem, we propose a model-driven deep neural network-based (DNN-based) receiver, whose performance is comparable with an existing support vector machine-based receiver, albeit with a much lower computational complexity.

Intelligent Reflecting Surface based Passive Information Transmission: A Symbol-Level Precoding Approach

no code implementations29 Jul 2020 Rang Liu, Ming Li, Qian Liu, A. Lee Swindlehurst, Qingqing Wu

Intelligent reflecting surfaces (IRS) have been proposed as a revolutionary technology owing to its capability of adaptively reconfiguring the propagation environment in a cost-effective and hardware-efficient fashion.

Multiuser Full-Duplex Two-Way Communications via Intelligent Reflecting Surface

no code implementations9 Jun 2020 Zhangjie Peng, Zhenkun Zhang, Cunhua Pan, Li Li, A. Lee Swindlehurst

Low-cost passive intelligent reflecting surfaces (IRSs) have recently been envisioned as a revolutionary technology capable of reconfiguring the wireless propagation environment through carefully tuning reflection elements.

Fairness Vocal Bursts Valence Prediction

Massive MIMO Channel Estimation with Low-Resolution Spatial Sigma-Delta ADCs

no code implementations15 May 2020 Shilpa Rao, Gonzalo Seco-Granados, Hessam Pirzadeh, Josef A. Nossek, A. Lee Swindlehurst

We consider channel estimation for an uplink massive multiple-input multiple-output (MIMO) system where the base station (BS) uses an array with low-resolution (1-2 bit) analog-to-digital converters and a spatial Sigma-Delta ($\Sigma\Delta$) architecture to shape the quantization noise away from users in some angular sector.

Quantization

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