*1 IMT-Advanced: A standard positioned as the successor to IMT-2000 at International Telecommunication Union Radiocommunication sector (ITU-R). It calls for data rates of about 100 Mbit/s for high mobility and 1 Gbit/s for low mobility. *2 ad hoc network: A network in which several mobile terminals communicate without any dedicated infrastructures such as base stations or access points. *3 UWB:...

This paper shows results of narrowband path loss measurements in a typical urban and suburban mobile-tomobile radio environment at 900 MHz band. The measurements were made with two omni-directional antennas with a transmitter and a receiver antenna height of 1.5 meters. The results of measurements provide practical values for path loss exponent and standard deviation of shadowing in a nonline-o...

Radio communications often take place in confined environments like city areas. The propagation channel presents shadowing and multipath phenomena due to interactions between radio wave and environment. In this work, a general hybrid channel model concept is proposed to associate the advantages of existing deterministic and statistical models. One of the model applications is introduced using a...

The aim of this paper is to investigate the handoff / handover concepts in wireless communication. Mobility is the distinct feature of wireless mobile cellular system. As a mobile subscriber move between different radio networks, a handover process is needed to change its point of attachment. The continuation of an active call is one of the most important quality measurements in cellular system...

In this paper a view of the European developments in the field of wireless broadband multimedia communications is given following two lines: on one side evolution in Second and Third Generation of mobile communications; on the other side evolution of multimedia data communications. This two evolutions will merge into a new concept of communications: the Mobile Broadband Systems, or fourth gener...

Cellular networks and wireless local area networks (WLAN) are being widely deployed for mobile radio communications. Taking into account the advantageous and drawbacks of both network architectures, it becomes obvious that a combination of them is the logical consequence for future mobile radio networks. The scope of this paper is to introduce a future radio network architecture called hierarch...

Mobile phone use and wireless communication technology have grown explosively over the past decades. This rapid growth has caused widespread global concern about the potential detrimental effects of this technology on human health. Stem cells generate specialized cell types of the tissue in which they reside through normal differentiation pathways. Considering the undeniable importance of stem ...

This paper extends the traditional Clarke/Jakes model for a frequency at fading process in a land mobile radio system to facilitate the examination of coherent space-time demodu-lation systems. The work develops a space-time correlation function using a ring of scatterers model around the mobile unit. The resulting correlation function permits the investigation of a variety of issues concerning...

Demand-based Radio Network Planning of Cellular Mobile Communication Systems Kurt Tutschku Institute of Computer Science, University of W urzburg Am Hubland, D-97074 W urzburg, Germany Tel.: +49-931-8885511, Fax: +49-931-8884601 E-mail: [email protected] Abstract: This paper presents a demand-based engineering method for designing radio networks of cellular mobile communica...