Robust Layered Transmission in Secure MISO Multiuser Unicast Cognitive Radio Systems
作者： Mohammad Shaqfeh , Derrick Wing Kwan Ng , Robert Schober , Hussein Alnuweiri
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摘要: This paper studies robust resource allocation algorithm design for a multiuser multiple-input single-output (MISO) cognitive radio (CR) downlink communication network. We focus on secondary system which provides unicast secure wireless layered video information to multiple single-antenna receivers. The is formulated as non-convex optimization problem minimization of the total transmit power at transmitter. proposed framework takes into account quality service (QoS) requirement regarding secrecy in system, imperfection channel state (CSI) potential eavesdroppers (primary receivers) transmitter, and limit maximum tolerable received interference primary Thereby, formulation exploits self-protecting architecture transmission artificial noise generation ensure secrecy. Semidefinite programming (SDP) relaxation employed derive finds global optimal solution problem. Simulation results demonstrate significant savings robustness against CSI compared baseline schemes with traditional single-layer transmission.
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