Constant-modulus beamforming method for secure secret communication system

A beamforming method and technology of a communication system, applied in the field of constant modulus beamforming, can solve problems such as increasing the cost of hardware implementation, and achieve the effects of high frequency band utilization efficiency, cost reduction, and utilization efficiency improvement

Active Publication Date: 2017-10-17
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Recent studies have shown that large-scale antenna array beamforming technology can effectively improve the efficiency of frequency ba

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  • Constant-modulus beamforming method for secure secret communication system
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  • Constant-modulus beamforming method for secure secret communication system

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Embodiment Construction

[0045] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0046] Such as figure 1 As shown, the constant modulus beamforming method in the secure and confidential communication system includes the following steps:

[0047] S1, initialization parameters;

[0048] S2, according to the parameter of initialization, adopt Dinkelbach algorithm to objective function value η by following formula i Iterate, get and save an objective function value η i ;

[0049]

[0050] in is the c...

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Abstract

The invention discloses a constant-modulus beamforming method for a secure secret system. The method comprises the following steps: S1, initializing parameters; S2, iterating a target function value eta solution formula by a Dinkelbach algorithm according to the initialized parameters to obtain a target function value eta, and saving the target function value eta; S3, iteratively solving a next-generation constant-modulus wave beam w<i+1> and a corresponding target function value eta<i+1> by an ADMM algorithm; and S4, performing judgment and outer layer iteration according to the eta obtained in the step S2 and the eta<i+1> obtained in the step S3, and outputting the constant-modulus wave beam w<i+1>. The method has relatively high frequency band utilization efficiency, and the frequency spectrum utilization efficiency is increased by a multi-antenna technology. Elements in a pre-coding matrix have constantly-equal modulus lengths, so that pre-coding of information can be realized by a single radiofrequency link and a simple phase shifter, and the hardware cost of a large-scale antenna array is lowered greatly. The transmitting power of each antenna is fixed, so that the operation power consumption of the whole system can be lowered, and the energy utilization efficiency is increased.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a constant modulus beam forming method in a secure and confidential communication system. Background technique [0002] MISOME (Multiple-Input Single-Output Multiple-Evesdropper) is one of the commonly studied scenarios in the field of physical layer security. In a past study [1], Khisti and Wornell derived a mathematical representation of the MISOME secrecy capacity and demonstrated that beamforming techniques can optimally achieve this secrecy capacity. Transmit beamforming technology is a simple and efficient technology for transmitting information. Recent studies have shown that large-scale antenna array beamforming technology can effectively improve the efficiency of frequency band utilization. However, when the number of transmit antennas increases, the cost of hardware implementation will be greatly increased. In order to utilize large-scale antenna arrays more effe...

Claims

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Application Information

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IPC IPC(8): H04B7/0426H04B7/0456H04B7/06
CPCH04B7/0426H04B7/0456H04B7/0617Y02D30/70
Inventor 利强李超林静然
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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