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Cooperative wave beam formation method capable of improving physical layer security based on null space

A physical layer security, zero-space technology, applied in space transmit diversity, radio relay systems, diversity/multi-antenna systems, etc., can solve the problem of difficult to apply multiple eavesdroppers, and achieve the effect of improving the security rate

Inactive Publication Date: 2013-10-16
XIDIAN UNIV
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Problems solved by technology

However, this algorithm is only applicable to the situation where there is a single eavesdropper in the network, and it is difficult to apply to the situation where there are multiple eavesdroppers in the next generation broadband wireless cooperative communication system

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  • Cooperative wave beam formation method capable of improving physical layer security based on null space
  • Cooperative wave beam formation method capable of improving physical layer security based on null space
  • Cooperative wave beam formation method capable of improving physical layer security based on null space

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Embodiment Construction

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] refer to figure 1 , the system model used in the present invention consists of a source node S, a destination node D, K relay nodes and M eavesdropping nodes, where K>M. Each node is equipped with a single antenna and adopts a half-duplex working mode. Assuming that all channels experience independent flat Rayleigh fading, there is no direct link between the source node and the destination node, and the source node can obtain global channel state information. For convenience, the channel vector from the source node to all relay nodes is expressed as f, the channel vector from all relay nodes to the destination node is expressed as g, and the channel vector from all relay nodes to the mth eavesdropping node is expressed as h j ,in, E represents the set containing all eavesdropping nodes. Assume that the received noise at each node is additive Gaus...

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Abstract

The invention discloses a cooperative wave beam formation method capable of improving physical layer security based on null space. In the prior art, a safety transmission problem when there is a plurality of eavesdropping nodes in a relay network can not be guaranteed. By using the method of the invention, the above problem is mainly solved. The method comprises the steps that 1) a source node sends confidential information to all the relay nodes and a relay carries out weighting processing on a received signal and then forwards to a destination node and the eavesdropping nodes; 2) a received signal to noise ratio of the destination node and the eavesdropping nodes is calculated; 3) according to the received signal to noise ratio, a safe rate of the destination node is calculated; 4) according to the signal after the weighting processing which is performed by the relay, consumption of relay total power and the power is calculated so as to obtain a power constraint; 5) the null space of an equivalent channel matrix of the eavesdropping nodes is calculated so as to obtain a space constraint; 6) under the condition that the power constraint and the space constraint are satisfied, an optimal wave beam shaping weight vector is designed; 7) the optimal wave beam shaping weight vector is distributed to each relay node. By using the method of the invention, the safe rate of the relay network where the plurality of eavesdropping nodes exist can be effectively increased.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a cooperative beamforming method when there are multiple eavesdroppers in the wireless relay network and each relay node has its own power constraints, which can be used to enhance the physical layer in the next-generation broadband wireless cooperative communication system Safety. Background technique [0002] In order to meet the high data rate and high system capacity requirements of 3GPP Long Term Evolution LTE, MIMO technology is widely used in the uplink and downlink systems of LTE. MIMO technology can make full use of the space diversity brought by multiple antennas on the transceiver equipment except time and frequency diversity, effectively improve the quality of the received signal and increase the data transmission rate. For single-antenna devices, the introduction of cooperative relay technology paves the way for the application of MIMO. Essentia...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/14
Inventor 葛建华林梅露高明杨烨岳安军程勇
Owner XIDIAN UNIV
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