Featured
White Paper on Broadband Connectivity in 6G - This white paper explores the road to implementing broadband connectivity in future 6G wireless systems. Different categories of use cases are considered, from extreme capacity with peak data rates up to 1 Tbps, to raising the typical data rates by orders-of-magnitude, to support broadband connectivity at railway speeds up to 1000 km/h.
- The role of small cells, coordinated multipoint, and massive MIMO in 5G - 5G will have to support a multitude of new applications with a wide variety of requirements, including higher peak and user data rates, reduced latency, enhanced indoor coverage, increased number of devices, and so on. The expected traffic growth in 10 or more years from now can be satisfied by the combined use of more spectrum, higher spectral efficiency, and densification of cells.
- Massive machine-type communications in 5g: physical and MAC-layer solutions - MTC are expected to play an essential role within future 5G systems. In the FP7 project METIS, MTC has been further classified into mMTC and uMTC. While mMTC is about wireless connectivity to tens of billions of machinetype terminals, uMTC is about availability, low latency, and high reliability.
Recent
Mobile communication - 6G, 5G
Physical layer
- Scoring the Terabit/s Goal:Broadband Connectivity in 6G - This paper explores the road to vastly improving the broadband connectivity in future 6G wireless systems. Different categories of use cases are considered, from extreme capacity with peak data rates up to 1 Tbps, to raising the typical data rates by orders-of-magnitude, and supporting broadband connectivity at railway speeds up to 1000 km/h. To achieve these, not only the terrestrial networks will be evolved but they will also be integrated with satellite networks, all facilitating autonomous systems and various interconnected structures.
Integrated access and backhaul (IAB)
- On Integrated Access and Backhaul Networks: Current Status and Potentials - In this article, we introduce and study the potentials and challenges of integrated access and backhaul as one of the promising techniques for evolving 5G networks. We study IAB networks from different perspectives.
Resource allocation
- Power Allocation in HARQ-Based Predictor Antenna Systems - In this letter, we study the performance of predictor antenna (PA) systems using hybrid automatic repeat request (HARQ). Here, the PA system is referred to as a system with two sets of antennas on the roof of a vehicle.
- An Error-limited NOMA-HARQ Approach using Short Packets - In this paper, we propose and analyze an error-constrained data transmission approach for uplink communication using non-orthogonal multiple access (NOMA). The results are presented for the cases with hybrid automatic repeat request (HARQ) protocols where, depending on the message decoding status in the previous rounds, the decoding scheme of the receiver as well as the data rates/transmission powers of the transmitters are adapted correspondingly.
Co-operative systems
- MSE Minimized Joint Transmission in
Coordinated MultiPoint Systems with Sparse Feedback and Constrained Backhaul Requirements - In a joint transmission coordinated multipoint (JT-CoMP) system, a shared spectrum is utilized by all neighbor cells. In the downlink, a group of base stations (BSs) coordinately transmit the users’ data to avoid serious interference at the users in the boundary of the cells, thus substantially improving area fairness.
Network security
- Secure Simultaneous Information and Power Transfer for Downlink Multi-User Massive MIMO - In this article, downlink secure transmission in simultaneous information and power transfer (SWIPT) system enabled with massive multiple-input multiple-output (MIMO) is studied. A base station (BS) with a large number of antennas transmits energy and information signals to its intended users, but these signals are also received by an active eavesdropper.
Moving networks
Convergent Communication, Sensing and Localization in 6G Systems: An Overview of Technologies, Opportunities and Challenges - Herein, we focus on convergent 6G communication, localization and sensing systems by identifying key technology enablers, discussing their underlying challenges, implementation issues, and recommending potential solutions.- Predictor Antenna: A Technique to Boost the Performance of Moving Relays - In future wireless systems, a large number of users may access wireless networks via moving relays (MRs) installed on top of public transportation vehicles. One of the main challenges of MRs is the rapid channel variation which may make the channel estimation, and its following procedures, difficult. To overcome these issues, various schemes have been designed, among which predictor antenna (PA) is a candidate technology.
- Predictor Antennas for Moving Relays: Finite Block-length Analysis - In future wireless networks, we anticipate that a large number of devices will connect to mobile networks through moving relays installed on vehicles, in particular in public transport vehicles. To provide high-speed moving relays with accurate channel state information different methods have been proposed, among which predictor antenna (PA) is one of the promising ones.
Positioning
- Tensor completion-based 5G positioning with partial channel measurements - 5G mmWave communication systems have promising properties for high precision user localization and environment mapping. Such information is of high value for emerging applications such as connected automated driving (CAD), and it has also potential to be explored to substantially improve efficiency and reliability of mmWave communications itself.
- 6G White Paper on Localization and Sensings - This white paper explores future localization and sensing opportunities for beyond 5G wireless communication systems by identifying key technology enablers and discussing their underlying challenges, implementation issues, and identifying potential solutions. In addition, we present exciting new opportunities for localization and sensing applications, which will disrupt traditional design principles and revolutionize the way we live, interact with our environment, and do business.
Vehicular communication
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On the Needs and Requirements Arising from Connected and Automated Driving - Future 5G systems have set a goal to support mission-critical Vehicle-to-Everything (V2X) communications and they contribute to an important step towards connected and automated driving. To achieve this goal, the communication technologies should be designed based on a solid understanding of the new V2X applications and the related requirements and challenges. -
Collaborative Localization with Truth Discovery for Heterogeneous and Dynamic Vehicular Networks - Collaborative localization over vehicular networks is challenging if quality varies among the collected multiple sources of information. These information sources are either from vehicle on-board sensors or remote sensing using vehicular communications.
Internet of Things
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A Unified Approach for Uncertainty Analyses for Total Radiated Power and Total Isotropic Sensitivity Measurements in Reverberation Chamber - With the rapid development and explosive application of the internet of things (IoT) technology, IoT devices become ubiquitous and indispensable in people’s daily lives. -
Statistical analysis of measurement uncertainty in total radiated power of wireless devices in reverberation chamber - Due to the explosive increase of wireless devices, efficient over-the-air testing of such devices is highly desirable. The reverberation chamber (RC) offers efficient and cost-effective means to determine performance metrics of wireless devices, such as total radiated power (TRP). In this study, the distribution of the measured TRP in an RC is analytically derived, based on which the statistics (i.e. mean, variance) of the measured TRP are derived as well. RC measurements have been performed to verify the analytically derived statistics.
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An Energy-Efficient Controller for Wirelessly-Powered Communication Networks - In a wirelessly-powered communication network (WPCN), an energy access point (E-AP) supplies the energy needs of the network nodes through radio frequency wave transmission, and the nodes store their received energy in their batteries for possible data transmission. In this paper, we propose an online control policy for energy transfer from the E-AP to the wireless nodes and for data transfer among the nodes.
An Energy-Efficient Controller for Wirelessly-Powered Communication Networks