This paper describes a measurement system enabling the complete real-time characterization of the wideband radio channel. The system is based on a wideband radio channel sounder and a spherical antenna array, and it aims to describe the three-dimensional (3-D) spatial radio channel seen by the mobile terminal, including polarization. This information is highly valuable in designing antennas for...

he demand for cost-efficient provision of mobile multimedia services is faced with the reality of scarce radio resources. The requirement of spectrum efficiency has driven the development of various digital radio technologies — digital audio broadcasting (DAB), digital video broadcasting (DVB), Global System for Mobile Communications (GSM), General Packet Radio System (GPRS), Universal Mobile T...

The standardisation work of GSM-based systems has its roots in the 1980s, when a standardisation body ‘Groupe Special Mobile’ (GSM)1 was created within the Conference Europeenne des Postes et Telecommunications (CEPT), whose task was to develop a unique digital radio communication system for Europe, at 900 MHz. Since the early days of GSM development, the system has experienced extensive modifi...

In this paper, the issue of time synchronization between base station and user equipment in a fifth-generation cellular communication system is considered. order to reduce complexity current method estimating start symbol offset, modification algorithm proposed, which cross-correlation computed parallel for each DMRS (Demodulation Reference Signal) symbol. Furthermore, calculating allows develo...

The present paper introduces a prototype design and experimental results for a multi-user MIMO linear precoding system. A base station and two mobile stations are implemented by taking full advantage of the software-defined radio. The base station consists of general purpose signal analyzers and signal generators controlled by a personal computer. Universal software radio peripherals are used a...

Recently, there is an increasing yet challenging demand on broadband mobile communications for high-speed trains. In this article, cognitive Doppler spread compensation algorithms are proposed for high-speed rail broadband mobile communications, which make use of the dedicated radio environment map (REM) for railway to compensate the time-varying Doppler spread. The dedicated REM for high-speed...

A mobile radio channel model is an essential prerequisite for the simulation, development and accurate testing of mobile radio systems. The European Co-operation in the Field of Scientific and Technical Research (COST) projects have a long history of research about channel models. The COST 207 project in the 1980s and in the early 1990s played an important role in the development and approval o...

The growth of the mobile network system of which the cellular systems like Global System Mobile Communications (GSM) and Personal Digital Cellular (PDC) are representative and the IP network attracts worldwide attention. The IP network access through the mobile data network system is required strongly to use the useful IP services anytime and anywhere. Therefore on the mobile data network syste...

This paper presents a study of packet data services over wireless connections in the context of Universal Mobile Telecommunication System (UMTS). To perform the study an emulator of the radio access part has been made which includes the mobile terminal and the UMTS Terrestrial Radio Network (UTRAN). The main features, the validation procedure and some results are contained.

This paper presents a measurement system for directional 3D real-time measurements of the wideband mobile radio channel. The system is based on a spherical antenna array and it enables the complete characterization of the mobile radio channel including time, delay, polarization, and direction in 3D. The measured signal statistics can be used e.g. for developing polarization or pattern diversity...