85 citations · 164 across the 14 of their papers we have counts for
16 papers
Active User Detection and Channel Estimation for Spatial-based Random Access in Crowded Massive MIMO Systems via Blind Super-resolution
Abolghasem Afshar, Vahid Tabataba Vakili, Sajad Daei
This work presents a novel framework for random access in crowded scenarios of multiple-input multiple-output(MIMO) systems. A multi-antenna base station (BS) and multiple single-a…
A Novel Dimension Reduction Scheme for Intrusion Detection Systems in IoT Environments
Amir Andalib, Vahid Tabataba Vakili
Internet of Things (IoT) brings new challenges to the security solutions of computer networks. So far, intrusion detection system (IDS) is one of the effective security tools, but…
An Autonomous Intrusion Detection System Using an Ensemble of Advanced Learners
Amir Andalib, Vahid Tabataba Vakili
An intrusion detection system (IDS) is a vital security component of modern computer networks. With the increasing amount of sensitive services that use computer network-based infr…
Deep learning for channel estimation in FSO communication system
M. A. Amirabadi
Perfect channel estimation is very hard, time/ power consuming, and expensive; so it is not preferred (e.g. in mobile) communication systems. This paper seeks for new, cheap, low c…
Strong Interference Alignment
Zainalabedin Samadi, Vahid Tabatabavakili, Farzan Haddadi
Interference alignment (IA) adjusts signaling scheme such that all interfering signals are squeezed in interference subspace. IA mostly achieves its performance via infinite extens…
Performance of a Relay-Assisted Hybrid FSO/RF Communication System
Mohammad Ali Amirabadi
This paper investigates performance of a relay assisted hybrid Free Space Optical / Radio Frequency (FSO/RF) communication system. The proposed structure is particularly recommende…
Performance Comparison of two novel Relay-Assisted Hybrid FSO / RF Communication Systems
Mohammad Ali Amirabadi
In this manuscript, two novel multi-hop relay-assisted hybrid Free Space Optical / Radio Frequency (FSO / RF) communication systems are presented and compared. In these structures,…
On the Construction of Polar Codes for Achieving the Capacity of Marginal Channels
Amirsina Torfi, Sobhan Soleymani, Siamak Aram +1
Achieving security against adversaries with unlimited computational power is of great interest in a communication scenario. Since polar codes are capacity achieving codes with low…
Enhancement of Physical Layer Security Using Destination Artificial Noise Based on Outage Probability
Ali Rahmanpour, Vahid T. Vakili, S. Mohammad Razavizadeh
In this paper, we study using Destination Artificial Noise (DAN) besides Source Artificial Noise (SAN) to enhance physical layer secrecy with an outage probability based approach.…
Polar Coding for Achieving the Capacity of Marginal Channels in Nonbinary-Input Setting
Amirsina Torfi, Sobhan Soleymani, Seyed Mehdi Iranmanesh +3
Achieving information-theoretic security using explicit coding scheme in which unlimited computational power for eavesdropper is assumed, is one of the main topics is security cons…
Proactive SRV spectrum handoff protocol based on GCS scheme in cognitive radio adhoc network
Morteza Mehrnoush, V. T. Vakili
Cognitive radio technology allows the secondary users to utilize the spectrum, when it is not occupied by the primary users. Whenever a primary user wants to utilize a channel whic…
Perfect Interference Alignment for an Interference Network with General Message Demands
Zainalabedin Samadi, Vahid Tabatabavakili, Farzan Haddadi
Dimensionality requirement poses a major challenge for Interference alignment (IA) in practical systems. This work evaluates the necessary and sufficient conditions on channel stru…
On feasibility of perfect interference alignment in interference networks
Zainalabedin Samadi, Vahid Tabatabavakili, Farzan Haddadi
Interference alignment(IA) is mostly achieved by coding interference over multiple dimensions. Intuitively, the more interfering signals that need to be aligned, the larger the num…
Channel Aided Interference Alignment
Zainalabedin Samadi, Vahid Tabataba Vakily, Farzan Haddadi
Interference alignment (IA) techniques mostly attain their degrees of freedom (DoF) benefits as the number of channel extensions tends to infinity. Intuitively, the more interferin…
CB-REFIM: A Practical Coordinated Beamforming in Multicell Networks
Mohammad Hossein Akbari, Vahid Tabataba Vakili
Performance of multicell systems is inevitably limited by interference and available resources. Although intercell interference can be mitigated by Base Station (BS) Coordination,…
Secure FSM- based arithmetic codes
Hashem Moradmand Ziyabar, Mahnaz Sinaie, Ali Payandeh +1
Recently, arithmetic coding has attracted the attention of many scholars because of its high compression capability. Accordingly, in this paper a method which adds secrecy to this…