Joint beamforming and optimal power allocation method in bidirectional untrusted relay network

A technology of beamforming and optimal power, which is applied to the shaping network, power management, wireless communication and other directions in the transmitter/receiver, and can solve the problems of not considering two-way transmission and power allocation problems

Active Publication Date: 2018-02-23
NORTHWESTERN POLYTECHNICAL UNIV
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However, the patent does not consider tw...

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  • Joint beamforming and optimal power allocation method in bidirectional untrusted relay network
  • Joint beamforming and optimal power allocation method in bidirectional untrusted relay network
  • Joint beamforming and optimal power allocation method in bidirectional untrusted relay network

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[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0045] The present invention provides beamforming and optimal power allocation in a two-way untrusted relay network, and designs the interference signal precoding matrix Q at the source node and the destination node A and Q B , so that reaching the relay node The cooperative interference signal power is maximized; a new method is proposed to jointly optimize the useful signal precoding matrix F A and F B And a power allocation scheme for each user to send useful signals and cooperative interference signals, thereby further improving the achievable security rate of the network.

[0046] At present, the research on physical layer security technology is mainly aimed at optimizing the design of eavesdropping nodes. The relay network itself is credible (such as document 1). ...

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Abstract

The invention provides a joint beamforming and optimal power allocation method in a bidirectional untrusted relay network. Interference signal pre-coding matrices QA and QB at a source node and a target node are designed, so that power of a collaborative interference signal reaching a relay node is maximized; and useful signal pre-coding matrices FA and FB and a power allocation scheme for each user to send a useful signal and the collaborative interference signal are optimized in a joint mode, so that a reachable safety rate of the network is further improved. According to the invention, theuseful signal is aligned to an equivalent signal space and the interference signal orthogonality is forced; meanwhile, the optimal power allocation of each user is generated; and the safety rate is improved to the greatest extent.

Description

technical field [0001] The present invention relates to a beam forming and power allocation method. Background technique [0002] In recent years, the security of wireless networks has received more and more attention. Unlike traditional encryption mechanisms, physical layer security has the advantages of low computational complexity and saving time and spectrum resources. As the problem of improving the security of wireless communication becomes more and more urgent, physical layer security has been widely paid attention in both theoretical research and practical application. [0003] With the shortage of communication resources and the development of multi-antenna technology, research on physical layer security based on multi-antenna has attracted extensive attention. In practical application systems, the source, sink and relay are generally configured with multiple antennas, which provide greater degrees of freedom (DoF) and flexibility for system optimization. However,...

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Application Information

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IPC IPC(8): H04B7/0426H04B7/0456H04W52/46H04L25/03H04B7/155
CPCH04B7/043H04B7/0456H04B7/15571H04L25/0391H04W52/46
Inventor 姚如贵姚鲁坤陆亚南徐菲徐娟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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