356 citations · 917 across the 37 of their papers we have counts for
20 papers · 1 filter
A Spatially Non-stationary Fading Channel Model for Simulation and (Semi-) Analytical Study of ELAA-MIMO
Jiuyu Liu, Yi Ma, Rahim Tafazolli
In this paper, a novel spatially non-stationary fading channel model is proposed for multiple-input multiple-output (MIMO) system with extremely-large aperture service-array (ELAA)…
Alternative Normalized-Preconditioning for Scalable Iterative Large-MIMO Detection
Jiuyu Liu, Yi Ma, Rahim Tafazolli
Signal detection in large multiple-input multiple-output (large-MIMO) systems presents greater challenges compared to conventional massive-MIMO for two primary reasons. First, larg…
Enhancement of Direct LEO Satellite-to-Smartphone Communications by Distributed Beamforming
Zhuoao Xu, Gaojie Chen, Ryan Fernandez +2
The low earth orbit (LEO) satellite network is undergoing rapid development with the maturing of satellite communications and rocket launch technologies, and the demand for a globa…
Leveraging User-Wise SVD for Accelerated Convergence in Iterative ELAA-MIMO Detections
Jiuyu Liu, Yi Ma, Rahim Tafazolli
Numerous low-complexity iterative algorithms have been proposed to offer the performance of linear multiple-input multiple-output (MIMO) detectors bypassing the channel matrix inve…
Space MIMO: Direct Unmodified Handheld to Multi-Satellite Communication
Yasaman Omid, Zohre Mashayekh Bakhsh, Farbod Kayhan +2
This paper examines the uplink transmission of a single-antenna handsheld user to a cluster of satellites, with a focus on utilizing the inter-satellite links to enable cooperative…
Outage Tradeoff Analysis in a Downlink Integrated Sensing and Communication Network
Marziyeh Soltani, Mahtab Mirmohseni, Rahim Tafazolli
This paper aims to analyze the stochastic performance of a multiple input multiple output (MIMO) integrated sensing and communication (ISAC) system in a downlink scenario, where a…
UAV-RIS-Aided Space-Air-Ground Integrated Network: Interference Alignment Design and DoF Analysis
Jingfu Li, Gaojie Chen, Tong Zhang +4
In space-air-ground integrated networks (SAGIN), receivers experience diverse interference from both the satellite and terrestrial transmitters. The heterogeneous structure of SAGI…
Achieving Maximum-likelihood Detection Performance with Square-order Complexity in Large Quasi-Symmetric MIMO Systems
Jiuyu Liu, Yi Ma, Rahim Tafazolli
We focus on the signal detection for large quasi-symmetric (LQS) multiple-input multiple-output (MIMO) systems, where the numbers of both service (M) and user (N) antennas are larg…
Collaborative Learning with a Drone Orchestrator
Mahdi Boloursaz Mashhadi, Mahnoosh Mahdavimoghadam, Rahim Tafazolli +1
In this paper, the problem of drone-assisted collaborative learning is considered. In this scenario, swarm of intelligent wireless devices train a shared neural network (NN) model…
Secure Transmission for THz-Empowered RIS-Assisted Non-Terrestrial Networks
Jing Yuan, Gaojie Chen, Miaowen Wen +2
The non-terrestrial networks (NTNs) are recognized as a key component to provide cost-effective and high-capacity ubiquitous connectivity in the future wireless communications. In…
Intelligent Omni Surface-Assisted Self-Interference Cancellation for Full-Duplex MISO System
Sisai Fang, Gaojie Chen, Pei Xiao +2
The full-duplex (FD) communication can achieve higher spectrum efficiency than conventional half-duplex (HD) communication; however, self-interference (SI) is the key hurdle. This…
A Non-Stationary Channel Model with Correlated NLoS/LoS States for ELAA-mMIMO
Jiuyu Liu, Yi Ma, Jinfei Wang +4
In this paper, a novel spatially non-stationary channel model is proposed for link-level computer simulations of massive multiple-input multiple-output (mMIMO) with extremely large…
Towards Radio Designs with Non-Linear Processing for Next Generation Mobile Systems
Konstantinos Nikitopoulos, Marcin Filo, Chathura Jayawardena +1
MIMO mobile systems, with a large number of antennas at the base-station side, enable the concurrent transmission of multiple, spatially separated information streams and, therefor…
Rate-Splitting for Multigroup Multicast Beamforming in Multicarrier Systems
Hongzhi Chen, De Mi, Zheng Chu +2
In this paper, we consider multigroup multicast transmissions with different types of service messages in an overloaded multicarrier system, where the number of transmitter antenna…
Massive MIMO performance with imperfect channel reciprocity and channel estimation error
De Mi, Mehrdad Dianati, Lei Zhang +2
Channel reciprocity in time-division duplexing (TDD) massive multiple-input multiple-output (MIMO) systems can be exploited to reduce the overhead required for the acquisition of c…
Stochastic Geometry Analysis of Ultra-Dense Networks: Impact of Antenna Height and Performance Limits
Marcin Filo, Chuan Heng Foh, Seiamak Vahid +1
The concept of Ultra Dense Networks (UDN) is often seen as a key enabler of the next generation mobile networks. However, existing analysis of UDNs, including Stochastic Geometry,…
Uplink Non-Orthogonal Multiple Access for 5G Wireless Networks
Mohammed Al-Imari, Pei Xiao, Muhammad Ali Imran +1
Orthogonal Frequency Division Multiple Access (OFDMA) as well as other orthogonal multiple access techniques fail to achieve the system capacity limit in the uplink due to the excl…
Spatial and Social Paradigms for Interference and Coverage Analysis in Underlay D2D Network
Hafiz Attaul Mustafa, Muhammad Zeeshan Shakir, Muhammad Ali Imran +1
The homogeneous Poisson point process (PPP) is widely used to model spatial distribution of base stations and mobile terminals. The same process can be used to model underlay devic…
Coverage gain and Device-to-Device user Density: Stochastic Geometry Modeling and Analysis
Hafiz Attaul Mustafa, Muhammad Zeeshan Shakir, Muhammad Ali Imran +2
Device-to-device (D2D) communication has huge potential for capacity and coverage enhancements for next generation cellular networks. The number of potential nodes for D2D communic…
Underlay Cognitive Radio with Full or Partial Channel Quality Information
Na Yi, Yi Ma, Rahim Tafazolli
Underlay cognitive radios (UCRs) allow a secondary user to enter a primary user's spectrum through intelligent utilization of multiuser channel quality information (CQI) and sharin…