Sensing the radio frequency bands is an open problem for dynamic spectrum access (DSA) in cognitive radio networks. To address this, numerous signal processing algorithms have been described based on entropy measurement. However, most of the methods lack connectivity between signal detection and appropriateness of the selected entropy. In this work, we propose an optimal detection method which ...

Software-Defined Radios (SDR) have developed exponentially in recent years. This is due to the high versatility that SDR platforms bring to communications systems. This survey aims at designing, developing, and validating a SDR-based Cognitive Radio Sensing System with a very high functionality to cost ratio. A Radio Band Power Measurement System will be implemented, as a proof of concept, whic...

INA (that stands for Institut National de l’Audiovisuel) is the French institute in charge of the archiving for radio and television. INA archives programs broadcasted by the French public radio or TV channels. But INA is also in charge of the legal deposit for Audiovisual: INA archives a selection of all programs broadcasted in France, be they by private or public channels. As a consequence, I...

The Radio spectrum has always been a scarce resource right from its initial deployment in 1920s. The television spectrum band is poorly utilized in Indian scenario. Also more efficient spectrum usage is possible with the migration from analogue to digital broadcasting. The use of Cognitive Radios allows an efficient use of the available resources so as to solve the problem of spectrum scarcity....

Radio propagation measurement is carried out in Jakarta, Indonesia, in anticipation of digital TV implementation in the country. Measurements are made using a fixed, portable receiver outdoors and indoors. Spatial variations of the received power, both large-scale and small-scale, are measured in these locations. Results show that the largescale path loss variation characteristics, as described...

Broadcast digitalization with its enormous benefits to the broadcasting industry will improve the quality of content of programs delivered by television stations. Africa has a switchover date of June, 2017. For Nigerians to have access to television broadcast once the switch over is completed, they must purchase high definition television sets or the set-up box. The awareness among urban dwelle...

-In the US the commercial dawn of unlicensed wireless products based on cognitive radio technology is anticipated to begin in 2008 when the Federal Communications Commission (FCC) will issue rules and regulations for low power operation in the UHF TV Spectrum. Viable products will undergo a rigorous regime of testing to demonstrate their ability to coexist on a non-interfering basis with existi...

Communication technologies are undergoing a very effective transformation in today's conditions. This transformation, on the other hand, brings new perspective to journalism by means of moving and platforms, enables be examined from different perspectives. The understanding journalism, which has been transformed elaborated with perspectives, is integrated communication causes emergence practice...

BACKGROUND The objective of this paper is to describe sources of information on HIV/AIDS and their relationship with AIDS-related knowledge and sexual behaviour in a rural area of south Senegal. METHODS A cross-sectional study using a standardized questionnaire was administered in 1994 by local interviewers to 240 men and 242 women aged 15-59 years, randomly selected from the general populati...