Downlink and Uplink Cooperative Transmission for Primary Secrecy Based Cognitive Radio Sensor Networks

摘要

Aiming at allocating more licensed spectrum towireless sensor nodes (SNs) under the constraint of the informationsecurity requirement of the primary system, in thispaper, we propose a cooperative relaying and jamming securetransmission (CRJS) scheme in which SNs will relay primarymessage and jam primary eavesdrop concurrently with SN’sdownlink and uplink information transmission in cognitive radiosensor networks (CRSNs). In our proposed CRJS scheme, SNstake advantages of physical layer secure technologies to protectthe primary transmission and acquire some interference-freelicensed spectrum as a reward. In addition, both decode-and-forward(DF) and amplify-and-forward (AF) relaying protocolsare investigated in our proposed CRJS scheme. Our object is tomaximize the transmission rate of SNs by optimal allocating of therelaying power, jamming power, and downlink and uplink transmitpower under the target secure transmission rate requirementof the primary system. Moreover, two suboptimal algorithms areproposed to deal with these optimization problems. Furthermore,we analyze the transmission rate of SNs and allocate the relayingpower, jamming power, and downlink and uplink transmit powerfor the asymptotic scenarios. Simulation results demonstratethe performance superiority of our developed strategy overconventional jamming scheme in terms of the transmission rateof WSN.