Unlock instant, AI-driven research and patent intelligence for your innovation.

A fsk modulation method based on pulse width equal-length mechanism

一种调制方法、FSK的技术，应用在数字信息传输领域，能够解决增加电路复杂性、降低解码成功率等问题，达到简化硬件调制发送耦合”电路、避免复杂性、降低总体成本的效果

Active Publication Date: 2018-05-08
CHANGZHOU INST OF TECH
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A fsk modulation method based on pulse width equal-length mechanism
  • A fsk modulation method based on pulse width equal-length mechanism
  • A fsk modulation method based on pulse width equal-length mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The present invention will be further explained below according to the drawings and specific embodiments of the specification.

[0029] Such as figure 1 As shown, to modulate "0", the adopted symbol width t 0 =11.25us, number of symbols n=9, modulation frequency f 0 It is approximately equal to 88.88KHz, and the total modulation time T is equal to 101.25us; to modulate "1", the used symbol width t 0 =10.125us, number of symbols m=10, 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.

[0030] A kind of FSK modulation method based on pulse width equal length mechanism, the step comprises:

[0031] 1. Timer initialization

[0032] 1) Take out a byte to be modulated and sent, and set the "number of byte cycles A" to 8 bits (times);

[0033] 2) Determine the lowest bit of the byte to be modulated an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention discloses an FSK modulation and demodulation method based on pulse width isometric mechanism. The method includes: 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", so that the total modulation width T0 of "0" equals to the total modulation width T1 of "1". In the field of low speed carrier communication, the present invention directly modulate and demodulate using a high speed single chip, DSP, etc. as master control devices, which can effectively increase success rate of demodulation identification under 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 modulation method based on a pulse width and equal length mechanism. Background technique [0002] FSK (Frequency-Shift Keying, frequency-shift keying) is a digital modulation technology that uses carrier frequency changes to transmit digital information. It has the characteristics of easy realization, good performance of anti-noise and anti-attenuation. It has been widely used in power carrier communication. Such as civilian smart meter reading system, telecontrol information sending and receiving in power grid, telemetry and remote control transmission in mine system, etc. [0003] The most commonly used method of FSK is to modulate the binary numbers 1 and 0 into f 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 relatively simple,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/10
CPCH04L27/1563
Inventor 吴志祥高波杜玉华黄亮
Owner CHANGZHOU INST OF TECH