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This paper investigates a power control scheme for cooperative cognitive communication system which employs an untrusted relay. More explicitly, a friendly jammer transmits a jamming signal enabling secure communication between the source and the destination, in the presence of an untrusted relay. In return, the source compensates the potential jammer with an access to its bandwidth for a fraction...
In wireless networks, wireless devices strictly limited power, size, cost, etc. The wireless communication needs not only high reliability but also low complexity and power. Recently MIMO system is remarkable for diversity technique that requires several antennas at transmitter, but to implement in wireless devices is difficult now. So in this paper, we use cooperative protocol using one antenna at...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
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