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FSK demodulation method based on pulse width isometric mechanism

A demodulation method and equal-length technology, applied in the field of digital information transmission, can solve problems such as increasing circuit complexity and reducing decoding success rate, and achieve the effects of avoiding complexity, reducing overall cost, and overcoming time drift

Active Publication Date: 2017-09-08
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brings great inconvenience to the FSK communication of smart appliances with high-speed single-chip microcomputer or DSP as the main control device, or increases the complexity of the circuit, or reduces the success rate of decoding

Method used

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  • FSK demodulation method based on pulse width isometric mechanism
  • FSK demodulation method based on pulse width isometric mechanism
  • FSK demodulation method based on pulse width isometric mechanism

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Embodiment Construction

[0033] The present invention will be further explained below based on the drawings and specific embodiments of the specification.

[0034] Such as figure 1 As shown, to modulate "0", the symbol width used is t 0 = 11.25us, the number of symbols n = 9, the modulation frequency f 0 Approximately equal to 88.88KHz, the total modulation time T is equal to 101.25us; to modulate "1", the symbol width t used 0 = 10.125us, the number of symbols m = 10, the modulation frequency f 0 It is approximately equal to 98.76KHz, and the total modulation time T is equal to 101.25us. The modulation center frequency is about 93.56KHz. The effective data rate of FSK can reach 9.8Kbit / s.

[0035] A FSK modulation method based on the mechanism of equal pulse width, the steps include:

[0036] 1. Timer initialization

[0037] 1) Take out a byte to be modulated and sent, and set the "byte cycle number A" to 8 bits (times);

[0038] 2) Determine the lowest bit of the transmitted byte to be modulated. When the l...

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Abstract

The invention discloses an FSK demodulation method based on pulse width isometric mechanism. The method comprises the following steps of modulating n pulses with the frequency of f0, and the cycle of t0 regarding ''0'', and modulating m pulses with the frequency of f1, and the cycle of t1 regarding ''1'' in order to make the total modulation width T0 of ''0'' be equal to the total modulation width T1 of ''1''. In the field of low speed carrier communication, the method directly modulates and demodulates with a high speed single chip, DSP and the like as master control devices, and the success rate of demodulation identification can be effectively improved in the premise of remarkably reducing the cost.

Description

Technical field [0001] The invention relates to the field of digital information transmission, in particular to an FSK demodulation method based on a pulse width equal length mechanism. Background technique [0002] FSK (Frequency-Shift Keying, Frequency Shift Keying) is a digital modulation technology that uses changes in carrier frequency to transmit digital information. It has the characteristics of easy implementation, good anti-noise and anti-attenuation performance. It has been widely used in power carrier communication. Such as civilian smart meter reading system, remote control information transmission and reception in the power grid, remote measurement and remote transmission in the mine system, etc. [0003] The most common method of FSK is to modulate the binary numbers 1 and 0 to f respectively 1 With f 2 Two dual-frequency FSK systems with different frequencies. The modulated frequency is much higher than the grid frequency. In the FSK system, "modulation" is relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/156
CPCH04L27/1563
Inventor 吴志祥高波杜玉华黄亮
Owner CHANGZHOU INST OF TECH