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Low Complexity Channel Estimation for Millimeter Wave Systems with Hybrid A/D Antenna Processing
George C. Alexandropoulos, Symeon Chouvardas
The availability of large bandwidth at millimeter wave (mmWave) frequencies is one of the major factors that rendered very high frequencies a promising candidate enabler for fifth…
Simultaneous Spectrum Sensing and Data Reception for Cognitive Spatial Multiplexing Distributed Systems
Nikolaos I. Miridakis, Theodoros A. Tsiftsis, George C. Alexandropoulos +1
A multi-user cognitive (secondary) radio system is considered, where the spatial multiplexing mode of operation is implemented amongst the nodes, under the presence of multiple pri…
Optimizing Access Mechanisms for QoS Provisioning in Hardware Constrained Dynamic Spectrum Access
Spyridon Vassilaras, George C. Alexandropoulos
One of the major challenges in Dynamic Spectrum Access (DSA) systems is to guarantee a required level of Quality of Service (QoS) to secondary users of the spectrum. In this paper,…
Performance Analysis of -Branch Scan-and-Wait Combining (SWC) over Arbitrarily Correlated Nakagami- Fading Channels
George C. Alexandropoulos, P. Takis Mathiopoulos, Pingzhi Fan
The performance of -branch scan-and-wait combining (SWC) reception systems over arbitrarily correlated and not necessarily identically distributed Nakagami- fading channels i…
User Scheduling and Optimal Power Allocation for Full-Duplex Cellular Networks
George C. Alexandropoulos, Marios Kountouris, Italo Atzeni
The problem of user scheduling and power allocation in full-duplex (FD) cellular networks is considered, where a FD base station communicates simultaneously with one half-duplex (H…
Performance Evaluation of User Scheduling for Full-Duplex Small Cells in Ultra-Dense Networks
Italo Atzeni, Marios Kountouris, George C. Alexandropoulos
Full-duplex (FD) communication is an emerging technology that can potentially double the throughput of cellular networks. Preliminary studies in single-cell or small FD network dep…
Advanced Coordinated Beamforming for the Downlink of Future LTE Cellular Networks
George C. Alexandropoulos, Paul Ferrand, Jean-Marie Gorce +1
Modern cellular networks in traditional frequency bands are notoriously interference-limited especially in urban areas, where base stations are deployed in close proximity to one a…