Multimedia applications and interfaces will change radically the way computer systems will look like in the coming years. Radio and TV broadcasting will assume a digital format and their distribution networks will be integrated to the Internet. Existing hardware and software infrastructures, however, are unable to provide all the scalability, ̄exibility, and quality of service (QoS) that these ...

The digital transition of analog TV is rapidly taking place throughout the world. However, the digital transition of radio is progressing at a slower rate. Diverse standards are being considered for adoption and different countries have different frequencies allocated for digital radio. As a consequence, the progress in the development of digital radio receiver chipsets has been rather stagnant...

During the last decades, the demand for higher data rates in wireless communication systems grew steadily. While the number of communication systems increased significantly, the amount of available spectral resources has remained constant. To exploit spectral resources more efficiently, cognitive radio concepts have become of utmost interest. The goal of cognitive radio systems is to sense the ...

background: timely notification is of great importance in health emergencies. so identifying the most important sources of information used by people in emergencies seems necessary. the objective of this study was to assess peoples’ level of awareness concerning the symptoms, routes of transmission, prevention, and treatment of h1n1 at the time of the pandemic and also to identify their most im...

Cognitive radio (CR) is a technology that is of growing interest internationally. Currently, there is a highly active worldwide community of academic and industrial researchers working in this field. Significant efforts have been made and focused on the many technical questions as well as on the economic and political challenges in order to move this new technology from research concept to real...

Femtocell is envisioned as a highly promising solution to tackle the communications in the indoor environments, which has been a very challenging problem for mobile network operators. Currently, the spectrum allocated to femtocells is from the same licensed spectrum of macrocells, and the same mobile network operator. In this case, the capacity of femtocell networks may be largely limited due t...

Spectrum Sensing is an essential part of Cognitive Radio. Spectrum can be sensed by numerous algorithms. Energy Based can easily detect presence of signal and cyclostationary based detection can easily detect signals at low SNR. We havecollaborated the two algorithms resulting in a Collaborative Approach. In addition to that a feature based detection has been used for calculating the probabilit...

Key techniques used in the ANx concept are ATM multiplexing, permanent virtual circuits (PVC), and a variety of modem techniques. These “off-the-shelf” techniques are combined with edge routers that provide IP routing, remote authentication, RADIUS and service-provider selection to create a high-speed Internet access solution. Because ANx is based on asynchronous transfer mode (ATM), it can enh...