Multi-antenna relay system physical layer safety design method based on signal to noise ratios

A physical layer security and relay system technology, applied in the field of wireless communication, can solve problems such as difficult to obtain accurate channel information, achieve the effect of improving transmission security, low computational complexity, and easy engineering implementation

Active Publication Date: 2017-10-13
SOUTHEAST UNIV
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In the actual system, since the eavesdropper is not a legitimate user o

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  • Multi-antenna relay system physical layer safety design method based on signal to noise ratios
  • Multi-antenna relay system physical layer safety design method based on signal to noise ratios
  • Multi-antenna relay system physical layer safety design method based on signal to noise ratios

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[0022] The present invention will be further clarified below in conjunction with the drawings and specific embodiments.

[0023] The physical layer security design method of a multi-antenna relay system based on signal-to-noise ratio disclosed in the embodiment of the present invention mainly includes the following steps:

[0024] Step 1. Use signal precoding matrix W r For the signal received by the relay terminal z r Process, get y r , The calculation formula is:

[0025] y r =W r z r

[0026] Where z r The expression is p a Indicates the signal power of the transmitter, g ar Indicates the channel from the transmitter to the relay, s a Represents the signal transmitted by the transmitter, n r Represents the additive white Gaussian noise at the relay end and satisfies E{·} means statistical average operation, (·)H means conjugate transpose operation, Is the variance of the noise at the repeater, and I is the unit matrix;

[0027] Step 2. Add the artificial noise signal to the pre-co...

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Abstract

The invention discloses a multi-antenna relay system physical layer safety design method based on signal to noise ratios. Through combined optimization of a precoding matrix of a relay end and an artificial noise autocorrelation matrix, the signal to noise ratio of a legal reception end is maximized on the condition that a signal to noise ratio of a wiretapper is made to satisfy secret communication restriction conditions and relay end emission power restriction conditions. The method is advantaged in that a condition that only the statistics channel state information can be acquired is fully considered, and better practicality is realized.

Description

technical field [0001] The invention relates to a physical layer security design technology of a multi-antenna relay system based on signal-to-noise ratio, and belongs to the technical field of wireless communication. Background technique [0002] In recent years, wireless communication technology has been widely used in various aspects such as military and civilian use, while bringing convenience to people. The openness of wireless channels also makes information security issues more and more prominent. Traditional wired communication usually uses methods such as data encryption to ensure communication security. Although these methods are still feasible in wireless communication, they have not fully compensated for the security holes caused by the openness of wireless channels. The researchers found that the reliability of wireless communication can be improved through the method of physical layer security transmission. [0003] In the middle and late 1990s, the emergence...

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Application Information

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IPC IPC(8): H04B7/04H04B7/0404H04B7/155
CPCH04B7/0404H04B7/046H04B7/15528
Inventor 沈弘张容晟赵春明
Owner SOUTHEAST UNIV
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