Cooperative OFDMA system power control method under physical layer security constraints
A technology of physical layer security and power control, applied in the field of communication, can solve the problem of not guaranteeing the security of user information, not considering the problem of eavesdropping on relay nodes, etc.
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[0038] refer to figure 1 , the transmission system used in the present invention is a typical single-cell cooperative OFDMA system, and the system includes a base station, a relay node, and a user node. Base station d is located in the center of the cell; K relay nodes r 1 ,...,r K Evenly distributed on the circle with the base station d as the center in the cell; M user nodes s 1 ,...,s M randomly distributed throughout the plot. Each user node has N available subcarriers that cannot be used by other user nodes, user node s m The set of available subcarriers is The sets of relay nodes and user nodes are respectively and Considering the uplink communication link in the cooperative OFDMA system, the base station is the destination node of all user nodes; among them, the user nodes using direct transmission communicate directly with the base station, and the user nodes that need cooperative communication first transmit information to a selected one The relay node, and...
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