Untrusted relay full-duplex transmission method and system combined with sink zero-forcing scrambling

A technology of zero-forcing scrambling and transmission method, applied in the field of communication systems, can solve the problems of affecting the security rate of the system, the complexity of signal processing is large, and the complexity of implementation is low, so as to improve the security transmission performance, eliminate adverse effects, and improve transmission. The effect of efficiency

Active Publication Date: 2021-12-31
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the existing solution uses the half-duplex mode, which needs to complete the transmission process within two time slots, which affects the improvement of the system security rate.
In addition, there are other solutions that use multi-antenna technology to enhance transmission performance. Multi-antenna technology is also divided into two types: 1) beamforming technology, which designs the optimal beamforming vector or matrix with the goal of optimizing the system rate, but the signal of this solution The processing complexity is large, and it increases the difficulty of obtaining channel state information; 2) Antenna selection technology, through a certain antenna selection criterion, selects one or more antennas among the transmitting or receiving antennas to optimize system performance. Low implementation complexity, but insignificant performance improvement over unscrambled schemes
[0004] In addition, there are also solutions that use one or more external friendly scrambling nodes to reduce the eavesdropping effect of untrusted relays by sending friendly interference signals. The friendly interference signals are known to legitimate nodes in advance, so they can be eliminated from the received signal , but this scheme relies on the assistance of external nodes, requires a large amount of information exchanged between nodes, and lacks flexibility and autonomy

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  • Untrusted relay full-duplex transmission method and system combined with sink zero-forcing scrambling
  • Untrusted relay full-duplex transmission method and system combined with sink zero-forcing scrambling
  • Untrusted relay full-duplex transmission method and system combined with sink zero-forcing scrambling

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Embodiment Construction

[0028] The present invention will be further described below through specific embodiments.

[0029] see figure 1 , an untrusted relay full-duplex transmission system combined with sink zero-forcing scrambling, including a secure wireless communication system with three nodes: source A, full-duplex relay R, and sink B. The information source A needs to transmit information to the destination B with the help of an untrusted relay, that is, a full-duplex relay R. The relay R is not only the assistant of information transmission, but also the eavesdropper E of the information.

[0030] Both source A and sink B are configured with multiple antennas, full-duplex relay R is configured with 1 transmitting antenna and 1 receiving antenna, and B is configured with N Bt root transmit antenna and N Br root receiving antenna, and satisfy N Bt >N Br . In order to improve transmission efficiency, both the full-duplex relay R and the sink B work in full-duplex mode, so the entire transmi...

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Abstract

Combining the untrusted relay full-duplex transmission method and system with zero-forcing scrambling at the sink, the source A sends a secret signal x to the full-duplex relay R, and the sink B simultaneously sends the artificial noise interference signal v to the full-duplex relay R; full-duplex relay R receives y R , and use the amplification and forwarding protocol to forward the signal x R =βy R To the destination B, β is the amplification and forwarding factor; the destination B adopts the maximum ratio receiving strategy to design the receiving vector r=g B , the received signal is y B = r H (g B x R +n B ), n B N for sink B Br ×1 dimensional additive white Gaussian noise vector, N Br is the number of receiving antennas. The invention improves the transmission efficiency and effectively reduces the reception effect of the eavesdropping node on the secret signal.

Description

technical field [0001] The invention relates to the field of communication systems, in particular to an untrusted relay full-duplex transmission method and system combined with zero-forcing and scrambling at a sink. Background technique [0002] In an untrusted relay communication system, the relay eavesdrops on the information while assisting the source to transmit information. In order to reduce the eavesdropping rate of the relay, the sink scrambling method is usually used, that is, when the source sends confidential information , the sink sends an interference signal, and then relays the received information in the second time slot using the amplification and forwarding protocol. After receiving the information, the sink cancels the interference signal sent by itself, so the interference signal will not reduce the received SINR. [0003] However, the existing solution adopts a half-duplex mode, and the transmission process needs to be completed within two time slots, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06H04B7/08H04B7/155H04B17/336H04L5/14H04W12/03
CPCH04B7/0456H04B7/0626H04B7/0617H04B7/086H04L5/14H04B7/15507H04B17/336H04W12/03
Inventor 赵睿
Owner HUAQIAO UNIVERSITY
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