Physical layer security precoding method and decoding method of Internet of Things downlink network

Abstract

The invention discloses a physical layer safety pre-encoding method and decoding method of an internet of things downlink network. The physical layer safety pre-encoding method and decoding method comprise the following steps: a controller perform pre-encoding processing on private information transmitted by each exciter on the space dimension and the time dimension in the continuous K+1 time slots; the private information transmitted by each exciter is distributed to M antennas, so that each antenna can perform weighted processing on a private signal at each time slot, namely, all signals canbe combined and received in the decoding process through a pre-encoding matrix Wk, and the interference among various secret information is removed; therefore, the physical layer safety pre-encodingmethod and decoding method provided by the invention are simple in computation and less in interference. The physical layer safety pre-encoding method and decoding method are suitable for the internetof things environment with weak computation capacity, large signal interference between equipment, and large signal detection and decoding complexity at the receiving end, and are high in security and low in complexity.

Description

technical field [0001] The invention relates to the field of communication security, in particular to the physical layer security technology in the downlink network of the Internet of Things. Background technique [0002] The Internet of Things paints a brand-new grand picture for the future Internet, that is, everything is connected. Under this network, as long as physical devices have computing and perception capabilities, they can communicate with other devices. By deploying tens of thousands of physical devices, such as sensors, controllers, and actuators, the pervasive sensing and control capabilities of the Internet of Things will revolutionize people's daily lives. [0003] Since the application scope of the Internet of Things involves commercial, industrial, government departments and military equipment, the security of information communication has undoubtedly become one of the basic problems to be solved urgently in the Internet of Things. Traditionally, informat...

AI Technical Summary

Problems solved by technology

First, the signal interference between physical devices deteriorates sharply as the number of devices increases; second, the signal interference between physical devices also increases the complexity of signal detection and decoding at the receiving end

Therefore, security and low complexity are the two major performance indicators for the secure communication of the physical layer of the Internet of Things downlink network, but the relevant research has rarely been reported.

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