in this paper, we consider a cooperative cognitive radio network in which there is an ofdm primary link and multiple single carrier secondary links.the primary link is required to maintain its secrecy rate above a predefined threshold. if the secrecy rate requirement is not satisfied, the secondary system help primary link to maintain its secrecy rate requirement. in doing so, the secondary trans...

PURPOSE We investigated the effects of subchronic exposure to radio frequency emitted from a conventional cellular telephone on the testicular function in adult rats. MATERIALS AND METHODS A total of 16 male Wistar rats at age 30 days were randomly divided into 2 groups, including experimental and control groups. The experimental group was exposed to radio frequency emitted from a conventiona...

This extensive growth of cellular telephone use around the world is due to the tremendous and rapid advances in the field of wireless communications. Moreover, the societal pressures for increased efficiency, and an improved sense of safety associated with the availability of a cell phone contributed to a dramatic increase in cellular telephone use by drivers in vehicles. It is estimated that m...