158 citations · 438 across the 70 of their papers we have counts for
18 papers · 1 filter
Heterogeneous Drone Small Cells: Optimal 3D Placement for Downlink Power Efficiency and Rate Satisfaction
Nima Namvar, Fatemeh Afghah, Ismail Guvenc
In this paper, we consider a heterogeneous repository of drone-enabled aerial base stations with varying transmit powers that provide downlink wireless coverage for ground users. O…
Coverage Analysis of Cellular-Connected UAV Communications with 3GPP Antenna and Channel Models
Zhuangzhuang Cui, Ke Guan, İsmail Güvenç +2
For reliable and efficient communications of aerial platforms, such as unmanned aerial vehicles (UAVs), the cellular network is envisioned to provide connectivity for the aerial an…
Low-Resolution Limited-Feedback NOMA for mmWave Communications
Yavuz Yapici, Ismail Guvenc, Huaiyu Dai
The spectrum-efficient millimeter-wave (mmWave) communications has recently attracted much attention as a viable solution to spectrum crunch problem. In this work, we propose a nov…
NOMA for VLC Downlink Transmission with Random Receiver Orientation
Yavuz Yapici, Ismail Guvenc
Visible light communications (VLC) is an emerging technology with a promise of viable solution to spectrum crunch problem in conventional radio frequency (RF) bands. In this work,…
SLNR Based Precoding for One-Bit Quantized Massive MIMO in mmWave Communications
Yavuz Yapıcı, Sung Joon Maeng, İsmail Güvenç +2
Massive multiple-input multiple-output (MIMO) is a key technology for 5G wireless communications with a promise of significant capacity increase. The use of low-resolution data con…
Low-Complexity Adaptive Beam and Channel Tracking for Mobile mmWave Communications
Yavuz Yapici, Ismail Guvenc
In this paper, we study low-complexity algorithms for beam and channel tracking for millimeter-wave (mmWave) communications. In particular, the least mean squares (LMS) and bidirec…
Adaptive Detection of Structured Signals in Low-Rank Interference
Philip Schniter, Evan Byrne
In this paper, we consider the problem of detecting the presence (or absence) of an unknown but structured signal from the space-time outputs of an array under strong, non-white in…
Comparison of Limited Feedback Schemes for NOMA Transmission in mmWave Drone Networks
Nadisanka Rupasinghe, Yavuz Yapici, Ismail Guvenc +1
Introducing non-orthogonal multiple access (NOMA) transmission to an unmanned aerial vehicle (UAV) based communication network is a promising solution to enhance its spectral effic…
A Graph Theoretic Approach for Training Overhead Reduction in FDD Massive MIMO Systems
Nadisanka Rupasinghe, Yuichi Kakishima, Haralabos Papadopoulos +1
The overheads associated with feedback-based channel acquisition can greatly compromise the achievable rates of FDD based massive MIMO systems. Indeed, downlink (DL) training and u…
Non-Orthogonal Multiple Access for mmWave Drone Networks with Limited Feedback
Nadisanka Rupasinghe, Yavuz Yapici, Ismail Guvenc +1
Unmanned aerial vehicle (UAV) base stations (BSs) can be a promising solution to provide connectivity and quality of service (QoS) guarantees during temporary events and after disa…
Non-Orthogonal Multiple Access for mmWave Drones with Multi-Antenna Transmission
Nadisanka Rupasinghe, Yavuz Yapici, Ismail Guvenc +1
Unmanned aerial vehicles (UAVs) can be deployed as aerial base stations (BSs) for rapid establishment of communication networks during temporary events and after disasters. Since U…
A MAP-Based Layered Detection Algorithm and Outage Analysis over MIMO Channels
Yavuz Yapici, Ismail Guvenc, Yuichi Kakishima
Efficient symbol detection algorithms carry critical importance for achieving the spatial multiplexing gains promised by multi-input multi-output (MIMO) systems. In this paper, we…
Sparsity-Aware Joint Frame Synchronization and Channel Estimation: Algorithm and USRP Implementation
Ozgur Ozdemir, Ridha Hamila, Naofal Al-Dhahir +1
Conventional correlation-based frame synchronization techniques can suffer significant performance degradation over multi-path frequency-selective channels. As a remedy, in this pa…
System-Level Performance of mmWave Cellular Networks for Urban Micro Environments
Nadisanka Rupasinghe, Yuichi Kakishima, Ismail Guvenc
In this paper, we investigate the propagation coupling loss (captures all sources of attenuation between serving cell and mobile station (MS)) and geometry metric (GM) (downlink av…
Multi-Element VLC Networks: LED Assignment, Power Control, and Optimum Combining
Yusuf Said Eroglu, Ismail Guvenc, Alphan Sahin +3
Visible light communications (VLC) is a promising technology to address the spectrum crunch problem in radio frequency (RF) networks. A major advantage of VLC networks is that they…
Impact of Angular Spread in Moderately Large MIMO Systems under Pilot Contamination
Nadisanka Rupasinghe, Yavuz Yapici, Jorge Iscar +1
Pilot contamination is known to be one of the main bottlenecks for massive multi-input multi-output (MIMO) networks. For moderately large antenna arrays (of importance to recent/em…
Smart Grid Security: Threats, Challenges, and Solutions
Anibal Sanjab, Walid Saad, Ismail Guvenc +2
The cyber-physical nature of the smart grid has rendered it vulnerable to a multitude of attacks that can occur at its communication, networking, and physical entry points. Such cy…
Capacity Analysis of LTE-Advanced HetNets with Reduced Power Subframes and Range Expansion
Arvind Merwaday, Sayandev Mukherjee, Ismail Guvenc
The time domain inter-cell interference coordination techniques specified in LTE Rel. 10 standard improves the throughput of picocell-edge users by protecting them from macrocell i…