The MIMO Communications system model is presented with reference to actual transmission line measurements on a 5 x 5 twisted – pair telephone cable. It is thought that such a model could be useful in complementing a fibre optic backbone internet system since twisted – pair connections to consumer premises are more economically viable then fibre optic ones. This paper shows that a successful imp...

Since 2013, a stream of disclosures has prompted reconsideration of surveillance law and policy. One of the most controversial principles, both in the United States and abroad, is that communications metadata receives substantially less protection than communications content. Several nations currently collect telephone metadata in bulk, including on their own citizens. In this paper, we attempt...

Since its creation in 1934, the Federal Communications Commission has exercised regulatory jurisdiction over all interstate common carrier communications service in the U.S. The Commission has broad powers to review rates and tariffs, determine investment and operating practices, approve new plant installations, and literally shape the entire communications carrier industry, but historically th...

Based on cellular automata (CA), the diffusion of communication products, namely the mobile phone (MP) and the landline telephone (LT), were modeled and simulated. The ordinary least squares (OLS) procedure and nonlinear regression method were carried out to estimate the diffusion parameters. The predicted results were compared with the actual data. It is found that: (1) the diffusion processes...

In this analysis we examine the market entry patterns of new local telephone companies. We construct and estimate a multinomial logit model using information describing numbering code distribution within local telephone markets and the associated income, density, and regulatory characteristics of these markets. Our findings support the conventional wisdom that facilities-based entry by new loca...

High assurance computer systems are computer systems where convincing evidence is required that the system satis es a collection of critical properties. To operate correctly, these systems must satisfy properties such as safety and security. Examples of high assurance systems include ight control systems, medical systems, and control systems for nuclear plants. In addition, increased reliance o...

Three experiments explore several factors which influence information transmission when warning messages are passed from person to person. In Experiment 1, messages were passed down chains of participants using five different modes of communication. Written communication channels resulted in more accurate message transmission than verbal. In addition, some elements of the message endured furthe...

In this article, we examine the existence of regions and borders in Belgium by means of an original data set of more than 200 million mobile communications and a mathematical method which allows networks to be divided into coherent groups in a natural and automatic manner. A geography of mobile communications is thus proposed based on the relative frequency of communications as well as their av...

This tutorial paper describes the current development in the use of low earth orbiting satellites (LEOS) for global personal communications. The basic architectures and rationales for design choices are discussed. Representative TDMA and CDMA systems are outlined and a summary of the diierences between LEOS communications and terrestrial cellular is presented along with the prospects for CDMA b...