Modeling of the Secondary System's Generated Interference and Studying of its Impact on the Secondary System Design

In this paper we study how much capacity a cellular secondary system can achieve if the interference to the TV system is kept under control. The interference is modeled and controlled in a slow fading environment. The secondary system's capacity is computed for the adjacent and for the co-channel (with respect to the TV channel). We study the behavior of the system capacity while changing the size of the no transmission area surrounding the TV coverage area. It turns out that for most of the secondary cell sizes the network with adjacent channel is in interference limited mode and the network with co-channel is in noise limited mode. Since in the co-channel we can not use very high power it is recommended to use in bigger cells only adjacent channel

Performance Analysis of Vertical and Higher Order Sectorization in Urban Environment at 28 GHz

| openaire: EC/H2020/815191/EU//PriMO-5GThe main aim of this paper is to compare the performance of a cellular network using higher order sectorization in a horizontal domain, vertical sectorization, and super cell configuration. The urban macrocellular environment from the city of Helsinki is targeted, and 28 GHz frequency is used as the frequency of operation. Conventional three sector site deployment scenario is also included for reference. The comparative analysis is conducted from different dimensions, and the performance metrics considered in this study includes the SINR, the inner sector traffic share, server dominance with 3 dB overlapping window, and the spectral efficiency of the system. This research work is carried out by doing 3D ray tracing simulations utilizing “sAGA”, a MATLAB based 3D ray tracing tool. It is found more complicated to find the optimal antenna configuration for vertical sectorization and super cell configuration in comparison with higher order sectorization. It is also established from the acquired results that the higher order sectorization is an easy approach for enhancing the cell capacity compared with vertical sectorization and super cell configuration. Higher order sectorization provides a spectral efficiency gain of around 96.7%, whereas the relative spectral efficiency gain of vertical sectorization and super cell configuration is limited to 62.8% and 10.6%, respectively, with respect to three sector site deployment.Peer reviewe

Analysis of Indoor Solutions for Provision of Indoor Coverage at 3.5 GHz and 28 GHz for 5G System

| openaire: EC/H2020/815191/EU//PriMO-5GThe 5th Generation (5G) wireless networks are envisioned to support emerging bandwidth-hungry applications. Millimeter wave (mmWave) communication has been considered as a promising solution for future capacity crunch due to large available bandwidth. However, an outdoor macrocellular layer lacks the capability of providing an adequate coverage to indoor users, especially at higher frequencies i.e. 28 GHz. Therefore, the provision of high data rates and high system capacity in an indoor environment requires a separate indoor solution. The main target of this paper is to analyze the performance of Ultra Dense Network (UDN) and Distributed Antenna System (DAS) deployment in an indoor (university office) environment at 1.8 GHz, 2.6 GHz, 3.5 GHz and 28 GHz frequency. This research work is conducted by performing a ray tracing simulation using a three dimensional floor plan. The obtained results show that the existing indoor solutions which are in operation at 2.6 GHz can be reused at 3.5 GHz frequency with minor power adjustment, or by using antennas with little higher gain. However, the operation at 28 GHz requires a new plan for providing good indoor coverage. Acquired results show that DAS improves the cell capacity by reducing the interference. However, the UDN provides a higher system capacity due to more number of cells. The real gain of operation at 28 GHz can only be achieved by using larger system bandwidth e.g 200 MHz band.Peer reviewe

On the Performance of AoA based Localization in 5G Ultra Dense Networks

| openaire: EC/H2020/815191/EU//PriMO-5GCellular systems are undergoing a transformation toward the fifth generation (5G). Envisioned applications in 5G include intelligent transport system (ITS), autonomous vehicles, and robots as a part of future roads, factories, and society. These applications rely to a great extent on accurate and timely location information of connected devices. This paper proposes a practical scheme for acquiring precise and timely position information by means of a user-centric ultra-dense network (UDN) architecture based on an edge cloud. The considered solution consists of estimating and tracking the azimuth angle-of-arrival (AoA) of the line-of-sight (LoS)-path between a device and multiple transmission-reception points (TRPs), each having a uniform linear antenna array (ULA). AoA estimates from multiple TRPs are fused into position estimates at the edge cloud to obtain timely position information. The extensive measurements have been carried out using a proof-of-concept software-defined-radio (SDR) testbed in order to experimentally assess the achievable positioning accuracy of the proposed architecture. A realistic UDN deployment scenario has been considered in which TRPs consist of antenna arrays mounted on lamp posts. Our results show that practical UDNs can provide sub-meter positioning accuracy of mobile users by employing ULAs with at least four antennas per TRP and by taking into account the non-idealities of the ULAs' phase and magnitude response.Peer reviewe