Direct radiation wireless digital communication system and method based on digital coding metamaterial

Abstract

The invention discloses a direct radiation wireless digital communication system based on a digital programmable metamaterial, which comprises a transmitting system and a receiving system, wherein information transmitted by the transmitting system is loaded on the programmable metamaterial and is directly radiated to free space under irradiation of a feed antenna in a constantly-changing far-fieldpattern form; and the receiving system summarizes electric field values received by receiving antennas at different locations in a far-field area to obtain the far-field pattern, and the transmittedoriginal information is restored through a mapping relationship between the far-field pattern and a coding sequence. The communication system provided by the invention saves a digital-to-analog conversion module and a mixing module, the complexity of the communication system is greatly simplified, and the cost of the communication system is reduced; inherent confidentiality is realized, the transmitted information can be ensured not to be intercepted from a single point or a non-key point from the lowest physical level, the performance can be enhanced easily, and the abilities of self adaptation and self perception are achieved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a wireless digital communication system, and more specifically relates to a direct radiation wireless digital communication system based on programmable metamaterials working in the microwave frequency band. Background technique [0002] With the invention of the telegraph, the telephone, and the discovery of electromagnetic waves, fundamental changes have taken place in the way of human communication. People use electric pulses on metal wires for wired information transmission, and use electromagnetic waves for wireless communication. The rapid development of today's communication field benefits from the emergence of digital communication systems. The working principle of modern digital communication systems is roughly as follows: First, the information to be transmitted is converted into digital form (binary code), which is convenient for electronic devices such as comp...

AI Technical Summary

Problems solved by technology

[0004] The coded metamaterials mentioned above have successfully combined digital information and physical information; but at present, there is no wireless communication system built using digitally coded metamaterials

[0005] In addition, in the actual wireless communication system, noise is ubiquitous. How to fight against noise is a key technology in the wireless communication system, and will determine the channel quality and transmission rate of the system. In the research process of traditional wireless digital communication systems , a variety of different technologies and means have emerged to overcome or reduce the impact of noise on the communication system. One of the more effective ways to improve the channel is to increase the signal-to-noise ratio (SNR) of the system, which can be achieved by increasing the output of the transmitter power or using multiple-input multiple-output technology (MIMO), but these two solutions are at the cost of additional power consumption and higher system complexity, which is not possible on power-sensitive devices such as satellites OK

In the prior art, there is no channel optimization method for metamaterial-based wireless communication systems in noisy environments

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