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Robust security beam forming method based on multi-objective optimization

A multi-objective optimization and beamforming technology, which is applied in the field of communication, can solve the problems of maximizing the security rate and minimizing the transmission power of the base station without compromising, the physical layer security performance of the satellite-ground fusion cognitive network cannot be guaranteed, and the signal Issues such as eavesdropping by illegal users

Active Publication Date: 2020-03-24
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the inherent broadcast nature of satellite communication makes the signal extremely easy to be eavesdropped by illegal users during the communication process, which leads to the inability to guarantee the physical layer security performance of the satellite-ground fusion cognitive network.
At the same time, there is no compromise between the maximization of the achievable security rate of the satellite-ground fusion cognitive network and the minimization of the base station transmission power

Method used

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  • Robust security beam forming method based on multi-objective optimization
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  • Robust security beam forming method based on multi-objective optimization

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Embodiment Construction

[0069] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0070] Such as figure 1 In the satellite-ground fusion cognitive network shown, we use the satellite communication network as the primary network, which includes a satellite 101 and a main ground user 102 . On the other hand, the terrestrial cellular network is regarded as a secondary network, which includes a terrestrial base station 201 , a secondary user 202 and K eavesdroppers 203 . In the present invention, it is assumed that the ground base station 201 is configured with a uniform linear antenna with N antenna elements, and the satellite 101, the ground primary user 102, the secondary user 202 and the eavesdropper 203 are all configured with a single antenna.

[0071] The base station 201...

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Abstract

The invention discloses a robust security beam forming method based on multi-objective optimization. The robust security beam forming method comprises the following steps: step a, establishing a satellite-ground fusion cognitive network under the condition of spectrum sharing of a satellite communication network and a ground cellular network; step b, setting a secondary user signal-to-interference-and-noise ratio threshold gamma s, an eavesdropping user signal-to-interference-and-noise ratio limit gamma e, the maximum transmitting power Pmax of the base station and the maximum interference power of the base station to the primary user in the satellite-ground fusion cognitive network; step c, establishing two optimization problems of secondary user reachable safety rate maximization and base station transmitting power minimization; step d, establishing a multi-objective optimization problem by adopting a weighted Chebyshev method; and step e, solving a transmitting beam forming weight vector of the base station and an applied artificial noise vector by adopting continuous convex estimation, Taylor series expansion and an interior point method. According to the robust security beam forming method based on multi-objective optimization provided by the invention, compromise between maximization of the reachable security rate and minimization of the transmitting power of the base station can be realized, so that the physical layer security transmission performance of a satellite-ground fusion cognitive network is effectively improved.

Description

technical field [0001] The invention relates to a robust safety beamforming method based on multi-objective optimization, which belongs to the technical field of communication. Background technique [0002] Satellite communication has the advantages of long transmission distance, wide coverage, not limited by geographical conditions, and high-speed data transmission. It has been widely used in many fields such as broadcasting, navigation, national defense, rescue and disaster relief. However, shadowing effects are caused when there are obstacles between the satellite and ground users. The shadowing effect is especially severe when the satellite elevation angle is low or when the user is indoors. In order to solve this problem, someone proposed a satellite-ground fusion cognitive network communication system. In this system, ground terminals receive satellite signals through ground relays. However, the inherent broadcast nature of satellite communication makes the signal e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04W52/24H04W52/26H04W52/42H04B7/185H04W12/12H04W12/122
CPCH04B7/0617H04W52/241H04W52/243H04W52/267H04W52/42H04B7/18565H04B7/18543H04W12/122Y02D30/70
Inventor 林敏淡振雷孔槐聪袁祖霞朱圣祥欧阳键
Owner NANJING UNIV OF POSTS & TELECOMM
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