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Frequency shift keying modulation method with configurable carrier frequency and application structure thereof

A technology of carrier frequency and frequency shift keying, which is applied in the direction of frequency modulation carrier system, etc., to achieve the effect of stable performance, high precision and strong anti-interference ability

Inactive Publication Date: 2012-09-12
CHANGZHOU INST OF MECHATRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem faced by communication in the underwater acoustic channel is that when the amount of information to be transmitted is large, the transmission rate of the system needs to be increased.

Method used

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  • Frequency shift keying modulation method with configurable carrier frequency and application structure thereof
  • Frequency shift keying modulation method with configurable carrier frequency and application structure thereof
  • Frequency shift keying modulation method with configurable carrier frequency and application structure thereof

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Embodiment Construction

[0018] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0019] See figure 1 As shown, before the FSK modulator starts to work, the microcontroller first writes the frequency control word to the frequency control word register group. The baseband signal is composed of 4 signal lines (s4, s3, s2, s1), which are connected to the control terminal of the multi-choice data selector, and can realize frequency shift keying in different ways of 2fsk, 4fsk, 8fsk, and 16fsk. When it is necessary to provide frequency shift keying in 16fsk mode, the baseband signals s4, s3, s2, and s1 all control the data selector, and s4, s3, s2, and s1 correspond to 16 states of 0000-1111, which can contro...

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Abstract

The invention relates to a frequency shift keying modulation method with configurable carrier frequency and an application structure thereof. A single-chip microcomputer writes preset frequency control words in a frequency register group; a baseband signal controls a multiple-for-one data selector to output the corresponding carrier frequency control word signal to the input end of a synchronization register; according to the different numbers of terminals selected by the data selector controlled by the baseband signal, different carrier frequency numbers and frequency shift keying modulation can be realized. By adopting the method provided by the invention, the carrier frequency value is configurable and can be adjusted according to the specific circumstances of a channel so as to adapt to the character of the channel; and the method has the advantages of stable performance, high precision, fast frequency conversion speed, continuous phase output in the frequency shift and strong anti-interference capacity.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, in particular to a frequency shift keying modulation method with configurable carrier frequency and its application structure. Background technique [0002] The actual underwater acoustic channel is very complex, and it has two interfaces, the water surface and the bottom. Due to the influence of temperature, salinity and static pressure, the speed of sound is different at different depths in water, and there is a vertical distribution of sound speed, which will cause the refraction of sound waves. The reflection of the upper and lower boundaries and the refraction in water make the actual underwater acoustic channel not a single-path channel but a multi-path channel. In order to reduce the impact of multipath interference, non-coherent detection methods are usually used. The frequency shift keying communication method can be realized by non-coherent detection method. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/12
Inventor 陶国正乔宏哲刘翠梅王艳
Owner CHANGZHOU INST OF MECHATRONIC TECH
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