Latent communication system and method based on non-cooperative blind source signal

Abstract

The invention discloses a latent communication system and method based on a non-cooperative blind source. The latent communication system comprises an information coding and transmitting end, an information receiving and demodulating end and a non-cooperative blind source signal, a non-cooperative blind source is used as a communication carrier wave, double antennas or multiple antennas are used as receiving ends, received electromagnetic waves are demodulated in a receiver, and therefore hidden transmission and passive transmission communication of information are achieved. By adopting the technical scheme of the invention, a signal emission source is not needed, the carrier emission power is saved, and new spectrum resources are not occupied; the circuit structure is simplified, and thehardware cost is reduced; concealed communication is guaranteed in the physical level, and indoor directional fixed-point communication can be achieved. Information can be sent to a sensor at a specific position in the Internet of Things, energy is provided for the radio frequency identification tag, and the wireless communication quality is improved.

Description

technical field [0001] The present invention relates to the technical field of covert, passive, passive and latent communication, in particular to a latent communication system and method based on non-cooperative blind source signals. The ubiquitous Wi-Fi, Bluetooth, GPS and other electromagnetic signals are passive communication methods with carrier waves. Background technique [0002] At present, in the field of wireless communication, the modulation and demodulation method used in the existing system needs to modulate the baseband signal onto the carrier. However, in order to increase the transmission rate and reduce the bit error rate, realize normal communication effect and improve communication quality, it is necessary to consider improving the signal-to-noise ratio of the system. There are currently three mainstream ways to improve the signal-to-noise ratio, increasing the carrier power and reducing the noise figure of the receiver, or using special modulation method...

AI Technical Summary

Problems solved by technology

This technology only realizes the "passive" concept on the side of the communication parties who are responsible for receiving information

Moreover, the communication distance in current RFID technology is limited to the near-field range of electromagnetic waves, and the number of communication terminals is also limited to one-to-one communication.

It is difficult to realize the true passive passive communication between the transmitter and the receiver in the existing technology. The communication capacity and communication distance of the existing RFID technology are limited, and the one-to-many communication is limited.

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