537 citations · 5.2k across the 258 of their papers we have counts for
25 papers · 2 filters
Fairness Scheduling in Dense User-Centric Cell-Free Massive MIMO Networks
Fabian Göttsch, Noboru Osawa, Takeo Ohseki +4
We consider a user-centric scalable cell-free massive MIMO network with a total of distributed remote radio unit antennas serving user equipments (UEs). Many works in the…
On the Capacity of "Beam-Pointing" Channels with Block Memory and Feedback: The Binary Case
Siyao Li, Giuseppe Caire
Millimeter-wave (mmWave) communication is one of the key enablers for 5G systems as it provides larger system bandwidth and the possibility of packing numerous antennas in a small…
A Note on Fourier-Motzkin Elimination with Three Eliminating Variables
Hao Xu, Kai-Kit Wong, Giuseppe Caire
In this note, we show how difficult the brute-force Fourier-Motzkin elimination is, even in a simple case with three eliminating variables. Specifically, we first give a theorem, w…
Little or no equalization is needed in energy-efficient sub-THz mobile access
Lorenzo Miretti, Thomas Kühne, Alper Schultze +5
By trading coverage and hardware complexity for abundance of spectrum, sub-THz mobile access networks are expected to operate under highly directive and relatively spectrally ineff…
SD-Based Low-Complexity Precoder Design for Gaussian MIMO Wiretap Channels
Hao Xu, Kai-Kit Wong, Giuseppe Caire
This paper considers a Gaussian multi-input multi-output (MIMO) multiple access wiretap (MAC-WT) channel, where an eavesdropper (Eve) wants to extract the confidential information…
Orthogonal Time Frequency Space Modulation -- Part III: ISAC and Potential Applications
Weijie Yuan, Zhiqiang Wei, Shuangyang Li +2
The first two parts of this tutorial on orthogonal time frequency space (OTFS) modulation have discussed the fundamentals of delay-Doppler (DD) domain communications as well as som…
Orthogonal Time Frequency Space Modulation -- Part II: Transceiver Designs
Shuangyang Li, Weijie Yuan, Zhiqiang Wei +2
The fundamental concepts and challenges of orthogonal time frequency space (OTFS) modulation have been reviewed in Part I of this three-part tutorial. In this second part, we provi…
Orthogonal Time Frequency Space Modulation -- Part I: Fundamentals and Challenges Ahead
Zhiqiang Wei, Shuangyang Li, Weijie Yuan +2
This letter is the first part of a three-part tutorial on orthogonal time frequency space (OTFS) modulation, which is a promising candidate waveform for future wireless networks. T…
Coding-Enhanced Cooperative Jamming for Secret Communication: The MIMO Case
Hao Xu, Kai-Kit Wong, Yinfei Xu +1
This paper considers a Gaussian multi-input multi-output (MIMO) wiretap channel with a legitimate transmitter, a legitimate receiver (Bob), an eavesdropper (Eve), and a cooperative…
MAC Wiretap Channels with Confidential and Open Messages: Improved Achievable Region and Low-complexity Precoder Design
Hao Xu, Kai-Kit Wong, Giuseppe Caire
This paper investigates the achievable region and precoder design for multiple access wiretap (MAC-WT) channels, where each user transmits both secret and open (i.e., non-confident…
FDD Massive MIMO Channel Training Optimal Rate Distortion Bounds and the Efficiency of one-shot Schemes
Mahdi Barzegar Khalilsarai, Yi Song, Tianyu Yang +1
We study the problem of providing channel state information (CSI) at the transmitter in multi-user massive MIMO systems operating in frequency division duplexing (FDD). The wideban…
Overloaded Pilot Assignment with Pilot Decontamination for Cell-Free Systems
Noboru Osawa, Fabian Göttsch, Issei Kanno +4
The pilot contamination in cell-free massive multiple-input-multiple-output (CF-mMIMO) must be addressed for accommodating a large number of users. In previous works, we have inves…
Distributed Information Bottleneck for a Primitive Gaussian Diamond Channel with Rayleigh Fading
Hao Xu, Kai-Kit Wong, Giuseppe Caire +1
This paper considers the distributed information bottleneck (D-IB) problem for a primitive Gaussian diamond channel with two relays and Rayleigh fading. Due to the bottleneck const…
Robust PCA for Subspace Estimation in User-Centric Cell-Free Wireless Networks
Fabian Göttsch, Noboru Osawa, Takeo Ohseki +2
We consider a scalable user-centric cell-free massive MIMO network with distributed remote radio units (RUs), enabling macrodiversity and joint processing. Due to the limited uplin…
Optimal User Load and Energy Efficiency in User-Centric Cell-Free Wireless Networks
Fabian Göttsch, Noboru Osawa, Takeo Ohseki +2
Cell-free massive MIMO is a variant of multiuser MIMO and massive MIMO, in which the total number of antennas is distributed among the remote radio units (RUs) in the syst…
Optimal Bandwidth Allocation for Multicast-Cache-Aided on-Demand Streaming in Wireless Networks
Mohsen Amidzadeh, Giuseppe Caire, Olav Tirkkonen
We consider a hybrid delivery scheme for streaming content, combining cache-enabled Orthogonal Multipoint Multicast (OMPMC) and on-demand Single-Point Unicast (SPUC) transmissions…
On the Fundamental Tradeoff of Integrated Sensing and Communications Under Gaussian Channels
Yifeng Xiong, Fan Liu, Yuanhao Cui +3
ISAC is recognized as a promising technology for the next-generation wireless networks, which provides significant performance gains over individual S&C systems via the shared use…
Multiple-antenna Placement Delivery Array for Cache-aided MISO Systems
Ting Yang, Kai Wan, Minquan Cheng +1
We consider the cache-aided multiple-input single-output (MISO) broadcast channel, which consists of a server with antennas and single-antenna users, where the server conta…
SwiftAgg+: Achieving Asymptotically Optimal Communication Loads in Secure Aggregation for Federated Learning
Tayyebeh Jahani-Nezhad, Mohammad Ali Maddah-Ali, Songze Li +1
We propose SwiftAgg+, a novel secure aggregation protocol for federated learning systems, where a central server aggregates local models of distributed users, ea…
Subspace-Based Pilot Decontamination in User-Centric Scalable Cell-Free Wireless Networks
Fabian Göttsch, Noboru Osawa, Takeo Ohseki +2
We consider a cell-free wireless system operated in Time Division Duplex (TDD) mode with user-centric clusters of remote radio units (RUs). Since the uplink pilot dimensions per ch…
Channel State Acquisition in FDD Massive MIMO: Rate-Distortion Bound and Effectiveness of "Analog" Feedback
Mahdi Barzegar Khalilsarai, Yi Song, Tianyu Yang +1
We consider the problem of estimating channel fading coefficients (modeled as a correlated Gaussian vector) via Downlink (DL) training and Uplink (UL) feedback in wideband FDD mass…
SwiftAgg: Communication-Efficient and Dropout-Resistant Secure Aggregation for Federated Learning with Worst-Case Security Guarantees
Tayyebeh Jahani-Nezhad, Mohammad Ali Maddah-Ali, Songze Li +1
We propose SwiftAgg, a novel secure aggregation protocol for federated learning systems, where a central server aggregates local models of distributed users, each of size ,…
Uplink-Downlink Duality and Precoding Strategies with Partial CSI in Cell-Free Wireless Networks
Fabian Göttsch, Noboru Osawa, Takeo Ohseki +2
We consider a scalable user-centric wireless network with dynamic cluster formation as defined by Björnsson and Sanguinetti. After having shown the importance of dominant channel s…
Coded Caching with Private Demands and Caches
Ali Gholami, Kai Wan, Hua Sun +2
Recently it was shown that the seminal Maddah-Ali and Niesen (MAN) coded caching scheme leaks the demand information of each user to the others. Many works have considered coded ca…