105 citations · 193 across the 20 of their papers we have counts for
30 papers
Geometry-Aware Decentralized Sinkhorn for Wasserstein Barycenters
Ali Baheri, Alireza Vahid
Distributed systems require fusing heterogeneous local probability distributions into a global summary over sparse and unreliable communication networks. Traditional consensus algo…
Recovering a Message from an Incomplete Set of Noisy Fragments
Aditya Narayan Ravi, Alireza Vahid, Ilan Shomorony
We consider the problem of communicating over a channel that breaks the message block into fragments of random lengths, shuffles them out of order, and deletes a random fraction of…
Physical Layer Authentication and Security Design in the Machine Learning Era
Tiep M. Hoang, Alireza Vahid, Hoang Duong Tuan +1
Security at the physical layer (PHY) is a salient research topic in wireless systems, and machine learning (ML) is emerging as a powerful tool for providing new data-driven securit…
Control and Placement of Finite-Resolution Intelligent Surfaces in IoT Systems with Imperfect CSI
Sajjad Nassirpour, Alireza Vahid, Dinh-Thuan Do +1
In this paper, we study the advantages of using reconfigurable intelligent surfaces (RISs) for interference suppression in single-input single-output (SISO) distributed Internet of…
GreenMO: Virtualized User-proportionate MIMO
Agrim Gupta, Sajjad Nassirpour, Manideep Dunna +3
With the turn of new decade, wireless communications face a major challenge on connecting many more new users and devices, at the same time being energy efficient and minimizing it…
Reassembly Codes for the Chop-and-Shuffle Channel
Sajjad Nassirpour, Ilan Shomorony, Alireza Vahid
We study the problem of retrieving data from a channel that breaks the input sequence into a set of unordered fragments of random lengths, which we refer to as the chop-and-shuffle…
Coded Shotgun Sequencing
Aditya Narayan Ravi, Alireza Vahid, Ilan Shomorony
Most DNA sequencing technologies are based on the shotgun paradigm: many short reads are obtained from random unknown locations in the DNA sequence. A fundamental question, studied…
On the Stability Region of Intermittent Interference Networks
Sajjad Nassirpour, Alireza Vahid
Recent information-theoretic studies have resulted in several interference management (IM) techniques that promise significant capacity improvements over interference avoidance tec…
Distortion-Based Outer-Bounds for Channels with Rate-Limited Feedback
Alireza Vahid
We present a new technique to obtain outer-bounds on the capacity region of networks with ultra low-rate feedback. We establish a connection between the achievable rates in the for…
Content Delivery over Broadcast Erasure Channels with Distributed Random Cache
Alireza Vahid, Shih-Chun Lin, I-Hsiang Wang +1
We study the content delivery problem between a transmitter and two receivers through erasure links, when each receiver has access to some random side-information about the files r…
Topological Content Delivery with Feedback and Random Receiver Cache
Alireza Vahid
We study the problem of content delivery in two-user interference channels with altering topology, random available cache at the receivers, and delayed channel knowledge at the tra…
Communicating over the Torn-Paper Channel
Ilan Shomorony, Alireza Vahid
We consider the problem of communicating over a channel that randomly "tears" the message block into small pieces of different sizes and shuffles them. For the binary torn-paper ch…
Embedding Information in Radiation Pattern Fluctuations
Milad Johnny, Alireza Vahid
The radiation pattern of transmit antennas varies and fluctuates as receivers change their location, other objects move around, and due to the antenna design itself. In this paper,…
Erasure Broadcast Channels with Intermittent Feedback
Alireza Vahid, Shih-Chun Lin, I-Hsiang Wang
Achievable data rates in wireless systems rely heavily on the available channel state information (CSI) throughout the network. However, feedback links, which provide this informat…
Capacity Region of Erasure Broadcast Channels with Common Message and Feedback
Alireza Vahid, Shih-Chun Lin, I-Hsiang Wang
Jolfaei et al. used feedback to create transmit signals that are simultaneously useful for multiple users in a broadcast channel. Later, Georgiadis and Tassiulas studied erasure br…
On the Degrees-of-Freedom of Two-Unicast Wireless Networks with Delayed CSIT
Alireza Vahid
We characterize the degrees-of-freedom (DoF) region of a class of two-unicast wireless networks under the assumption of delayed channel state information at the transmitters. We co…
Capacity Results for Intermittent X-Channels with Delayed Channel State Feedback
Alireza Vahid
We characterize the capacity region of noiseless X-Channels with intermittent connectivity and delayed channel state information at the transmitters. We consider the general case i…
Throughput Region of Spatially Correlated Interference Packet Networks
Alireza Vahid, Robert Calderbank
In multi-user wireless packet networks interference, typically modeled as packet collision, is the throughput bottleneck. Users become aware of the interference pattern via feedbac…
Correcting Two Deletions and Insertions in Racetrack Memory
Alireza Vahid, Georgios Mappouras, Daniel J. Sorin +1
Racetrack memory is a non-volatile memory engineered to provide both high density and low latency, that is subject to synchronization or shift errors. This paper describes a fast c…
When Does Spatial Correlation Add Value to Delayed Channel State Information?
Alireza Vahid, Robert Calderbank
Fast fading wireless networks with delayed knowledge of the channel state information have received significant attention in recent years. An exception is networks where channels a…
Informational Bottlenecks in Two-Unicast Wireless Networks with Delayed CSIT
Alireza Vahid, Ilan Shomorony, Robert Calderbank
We study the impact of delayed channel state information at the transmitters (CSIT) in two-unicast wireless networks with a layered topology and arbitrary connectivity. We introduc…
Two-User Erasure Interference Channels with Local Delayed CSIT
Alireza Vahid, Robert Calderbank
We study the capacity region of two-user erasure interference channels with local delayed channel state information at the transmitters. In our model, transmitters have local misma…
Approximate Capacity Region of the Two-User MISO Broadcast Channels with Delayed CSIT
Alireza Vahid, Mohammad Ali Maddah-Ali, Amir Salman Avestimehr
We consider the problem of multiple-input single-output Broadcast Channels with Rayleigh fading where the transmitter has access to delayed knowledge of the channel state informati…
Binary Fading Interference Channel with No CSIT
Alireza Vahid, Mohammad Ali Maddah-Ali, Amir Salman Avestimehr +1
We study the capacity region of the two-user Binary Fading (or Erasure) Interference Channel where the transmitters have no knowledge of the channel state information. We develop n…