Temporal correlation between atmospheric anomalies and earthquakes has recently been verified statistically through measuring VHF FM radio waves transmitted beyond the line-of-sight. In order to locate the sources of such atmospheric anomalies, we developed a VHF interferometer system (bistatic-radar type) capable of finding the arrival direction of FM radio waves scattered possibly by earthqua...

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 DARPA RATS Program focuses on the development of new technologies for identifying and processing speaker-tospeaker communications over degraded radio channels. In order to build a corpus to address this research question, we developed a system that takes a clean source signal and transmits it over eight different radio channels, where the variation from channel to channel results in a range...

[1] 3GPP TR 21.905 V11.2.0 (2012-09) Vocabulary for 3GPP Specifications [2] 3GPP TR 23.882 V8.0.0 (2008-09) 3GPP System Architecture Evolution: Report on Technical Options and Conclusions [3] 3GPP TS 22.278 V12.1.0 (2012-06) Service requirements for the Evolved Packet System (EPS) [4] 3GPP TR 25.912 V11.0.0 (2012-09) Feasibility study for evolved Universal Terrestrial Radio Access (UTRA) and ev...

A new method of deriving the cosmological evolution of radio AGN is described which is based on the premise of unified models for quasars and radio galaxies. The 'starburst vs monster' debate takes place on several levels, for example the relation between starburst and AGN nuclear activity[1] and between background contributions[2]. The original version of the Madau diagram [3] led several auth...

LSI +61 303 is an exotic binary system consisting of a 10 M B star and a compact object which is probably a neutron star. The system is associated with the interesting radio source GT 0236+610 that exhibits bright radio outbursts with a period of 26.5 days. We report the results of continuous daily radio interferometric observations of GT 0236+610 at 2.25 and 8.3 GHz from 1994 January to 1996 F...

Digitized-Radio over Fibre (DRoF) techniques provide higher dynamic range and are more robust against optical link impairments. In this paper, a fully-photonic DRoF system is proposed and its performance is investigated in an integrated system with an analogue Radio over Fibre (ARoF) system. In this simulation based evaluation, DRoF and ARoF systems performance in the presence of other channels...

many countries have created systems for monitoring food products. however, these systems need paper and label and also, cannot find the origin and final destination of food product. radio frequency identification (rfid) has the capability of monitoring foods completely and track the mentioned points. this technology also can monitor many food products simultaneously. the usage of this system ca...

This paper discusses results of the recent experiments, which intention was to test security in accessing e-mail servers and radio relay systems within the amateur radio digital infrastructure. There are many opportunities in available safety measures, which support the integrity of user's and system administrator's credentials. This work suggests various methods which aim is to bridge the gap ...

The online observation of a construction site and processes bears significant advantage to all business sector. BIM is the combination of a 3D model of the project and a project-planning program which improves the project planning model by up to 6D (Adding Time, Cost and Material Information dimensions to the model). RFID technology is an appropriate information synchronization tool between the...