Evolution of Positioning Radio Interfaces in Mobile Radio Networks

In this paper, we analyze the evolutionary features of the radio interfaces of cellular 2G–4G mobile radio systems from the point of view of solving network positioning problems. The analysis shows that along with the improvement of the parameters of positioning signals, special mechanisms appeared for their formation, processing and reuse in different cells, which contributed to increasing the accuracy of the collection of primary measurements.

EVOLUTION OF POSITIONING PROCEDURES IN MOBILE RADIO NETWORKS

In this paper, we analyze the evolutionary features of positioning procedures in cellular 2G - 4G mobile radio systems. The analysis shows that along with the improvement of the architecture and methods of network positioning, new special mechanisms and procedures for the exchange of data appeared for the collection and processing of primary measurements during location estimation.

Mission critical ICT

In this paper, three technologies intended to be implemented in Private Mobile Radio systems are analyzed and compared: TETRA (Terrestrial Trunked Radio), LTE (Long Term Evolution) and DMR (Digital Mobile Radio). Characteristics of these networks are collected and compared in one SWOT table. Based on this analysis, appropriate recommendations are made, which should be taken into account when choosing a specific solution for specific uses in Critical Communications systems.

MIMO Fading Emulator Development with FPGA and Its Application to Performance Evaluation of Mobile Radio Systems

We present four new developments for a multiple-input multiple-output (MIMO) over-the-air measurement system based on our previous studies. The first two developments relate to the channel model for multipath environment generation. One is a further simplification of the circuit configuration without performance degradation by reducing the number of delay generation units, which dominate the performance limit when implementing the circuit on a field-programmable gate array (FPGA). The other is to realize spatial correlation characteristics among the input ports on the transmission side, whereas the previously proposed channel model did not consider this correlation. The third development involves the details of implementing the MIMO fading emulator on an FPGA as a two-stage scheme. The fourth is the demonstration of application examples of the developed system.