Direct Radiation Wireless Digital Communication System and Method Based on Digitally Coded Metamaterial

Abstract

The invention discloses a direct radiation wireless digital communication system based on digital programmable metamaterials, which includes a transmitting system and a receiving system. The ever-changing form of the far-field pattern radiates directly into the free space; the receiving system summarizes the electric field values ​​received by the receiving antennas at different positions in the far-field area to obtain the far-field pattern, and passes the far-field pattern and the code The mapping relationship between the sequences recovers the original information sent. The communication system provided by the present invention omits the modules of digital-to-analog conversion and frequency mixing, which greatly simplifies the complexity of the communication system and reduces the cost of the communication system; Ensure that the transmitted information cannot be intercepted from a single point or non-key point, easy to improve performance, and has the ability of self-adaptation and self-awareness.

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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