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Multi-relay non-orthogonal multiple access system secure transmission scheme based on artificial noise

A non-orthogonal multiple access, artificial noise technology, applied in diversity/multi-antenna systems, security devices, location diversity and other directions to ensure safe transmission and reduce complexity

Active Publication Date: 2019-06-14
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the system security problem that there may be eavesdroppers in the two-hop transmission of the downlink cooperative multi-relay non-orthogonal multiple access system, the present invention provides an artificially scrambled multi-relay cooperative non-orthogonal multiple access system security Transmission scheme

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  • Multi-relay non-orthogonal multiple access system secure transmission scheme based on artificial noise
  • Multi-relay non-orthogonal multiple access system secure transmission scheme based on artificial noise
  • Multi-relay non-orthogonal multiple access system secure transmission scheme based on artificial noise

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Embodiment Construction

[0051] (1) System default

[0052] The non-orthogonal multiple access communication system described in the embodiment of the present invention includes K+3 nodes in total, where K is the number of half-duplex relay nodes R, and K≥1. In addition, the system also includes source node S, two user nodes U 1 and U 2 (where U 1 and U 2 represent strong users and weak users respectively), eavesdropping node E. Source node S and two users U 1 and U 2 There is no direct transmission link between them due to deep fading, and the communication requires multi-relay assistance, and all nodes are equipped with a single antenna. All channels are assumed to obey independent and identically distributed Nakagami-m fading.

[0053] (2) Implementation process

[0054] The specific implementation process of the present invention is as attached Figure 7 shown. The implementation process of the present invention is divided into seven steps:

[0055] Step S1: System initialization; send ...

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Abstract

The invention provides a multi-relay non-orthogonal multiple access system secure transmission scheme based on artificial noise. The transmission system comprises a source node, two users, an eavesdropping node and a plurality of relay nodes. In the scheme, the whole communication process is divided into four stages: a preparation stage, a multi-relay decoding stage, a relay selection stage and auser decoding stage. System communication is completed in two time slots: a first time slot and information source S broadcast messages to all relay nodes, a message mapping strategy is adopted duringbroadcasting, and the relay receives signals and decodes the signals. In the second time slot, the system performs double-relay selection, selects an optimal relay forwarding user signal from the decodable relay set, and selects an optimal relay sending artificial noise from the undecodable relay set. The relay selection strategy can effectively reduce the complexity and the safety interruption probability of the system while maintaining the diversity gain of the multi-relay system. And the signal-to-noise ratio of the eavesdropping end can be further reduced through artificial noise scrambling, and the safety performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication networks, in particular to a wireless communication network adopting cooperative non-orthogonal multiple access technology, and the invention belongs to the field of physical layer security. Background technique [0002] In the past two decades, mobile communication technology has undergone a rapid development. At the same time, the explosive growth of mobile data volume brought about by the popularization of smart terminals has put forward higher requirements for the rate, delay, and signal coverage of wireless communication networks. Compared with traditional orthogonal multiple access technology, non-orthogonal multiple access technology has attracted extensive attention from the industry and academia due to its high bandwidth efficiency, high user fairness, ultra-high connectivity and compatibility. The cooperative communication technology can not only improve the coverage of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/08H04W24/06H04W40/22H04B7/026
Inventor 雷宏江杨子轩任智
Owner CHONGQING UNIV OF POSTS & TELECOMM
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