An asynchronous duplex zero radio frequency wireless communication system

Abstract

The invention provides an asynchronous duplex zero-radio-frequency wireless communication system. A method comprises the following steps: attaching information on a starting frequency for sending a variable-frequency signal only in need of one reference frequency, directly performing baseband modulation in a frequency band supported by communication so as to obtain a variable-frequency broadband signal, demodulating to obtain the starting frequency, and solving one or more codes according to a mapping function relationship, wherein the starting frequency, the reference frequency and one or more codes are in the one-to-one mapping function relationship. The asynchronous duplex zero-radio-frequency wireless communication system sends and receives signals through energy conversion, so that a radio-frequency transmission module is unnecessary; a low-frequency transmitting head of a sender supports transmission of wideband signals; and a receiver receives the signals through a multi-mode small-calibre receiving array. According to the invention, the frequency band utilization rate is high; few carriers are required; frequency variations are resistant; the codes are demodulated through frequency estimation; and the asynchronous duplex zero-radio-frequency wireless communication system is applied to an occasion, in which wireless communication is carried out through energy conversion, such as thermo-acousto-optic electromagnetism.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a zero-radio frequency system that directly utilizes baseband frequency conversion signals to carry codeword information for asynchronous duplex communication. Background technique [0002] All kinds of wireless communications are currently facing the problem of shortage of spectrum resources, especially for low-frequency wireless communications, such as underwater wireless communications. Since electromagnetic waves are severely attenuated in water, and sound waves are the only form of energy known to humans so far that can travel long distances in water, underwater communications usually use sound waves. The attenuation coefficient of 1Hz-50KHz sound wave in water is about 10 -4 dB / m~10 -2 dB / m, as the frequency increases, the attenuation of sound waves becomes larger and larger, so underwater communication uses low-frequency acoustic communication and the available bandwi...

AI Technical Summary

Problems solved by technology

[0007] For current wireless communication methods, radio frequency technology is often used to move the transmitted signal to the high-frequency band, which is not suitable for low-frequency wireless communication. It is greatly affected by the carrier, which increases the cost of hardware. Demodulation is mainly based on the detection range, and the estimation accuracy is low.

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