Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

M-FSK modulation method, device and system

A technology of M-FSK and modulation method, which is applied in the field of information communication, can solve problems such as waste of spectrum resources, interference scenarios, and fixed bandwidth, and achieve the effects of improving transmission rate or coverage, solving spectrum utilization, and improving coverage

Active Publication Date: 2021-02-02
SHANGHAI JINGXING INFORMATION TECH CO LTD
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the existing FSK technology is relatively single, with fixed bandwidth, and relatively fixed rate and coverage, it cannot be well adapted to multi-scenario wireless communication
For example, in the unlicensed spectrum, the bandwidth can often be used up to 200KHZ. If only the existing fixed 2FSK method is used, the available bandwidth cannot be fully utilized, resulting in a waste of spectrum resources.
[0006] In addition, due to the lack of wireless channel coding in the existing frame data, there may be interference scenarios when the channel is fading, resulting in a high frame error rate

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
  • M-FSK modulation method, device and system
  • M-FSK modulation method, device and system
  • M-FSK modulation method, device and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In Embodiment 1 of this application, the M-FSK modulation method is compatible with the original 2FSK or 2GFSK format, the Preamble frame is sent in the original 2FSK or 2GFSK format, the SYNC code is modulated in 2FSK or 2GFSK, and the SYNC frame contains various modulation information. If the information is the same as the original 2FSK or 2GFSK format, the Data frame adopts the original 2FSK or 2GFSK format; if the modulation information is different, the frame structure of the Data frame is modulated and transmitted according to the pre-agreed.

Embodiment 2

[0035] In the second embodiment of the present application, the modulation order M of the M-FSK modulation method is greater than or equal to 2, and the Preamble frame, the SYNC frame and the Data frame are all modulated in the M-FSK format;

[0036] Among them, the format of the Preamble frame or the sequence information sent is different from the original 2FSK or 2GFSK format; specifically, it can have the following forms:

[0037] ①The Preamble code can be a repeated sequence, the minimum repetition granularity is N symbols, N≥2, and the total number of Preamble code symbols is an integer multiple of N;

[0038] ②The Preamble code is a non-repetitive m-sequence modulated by 2FSK or 2GFSK, wherein the m-sequence is the abbreviation of the longest linear shift register sequence. The longest code sequence generated; in the binary shift register, if n is the number of stages of the shift register, the n-stage shift register has a total of 2n states, and there are 2n-1 states in...

Embodiment 3

[0041] Embodiment 3 of the present application provides an M-FSK modulation method, which is applied to a low-power wide-area communication system. The low-power wide-area communication system includes an M-FSK modulation device and an M-FSK demodulation device. The M-FSK The FSK modulation device performs as described in figure 1 The shown M-FSK modulation method, the method specifically includes the following steps:

[0042] Step 110, setting the modulation format of the Preamble code of the Preamble frame, using the modulation format set to send the Preamble code;

[0043] In the embodiment of the present application, the symbol of the Preamble code can be modulated by M-FSK technology, and the Preamble code is a relatively fixed transmission format, and the two ends of the transceiver (ie, the M-FSK modulation device and the M-FSK demodulation device) are agreed in advance , can also be modulated without repeating the m sequence.

[0044] Specifically, for modulation us...

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 invention discloses an M-FSK modulation method, device and system. The method comprises the following steps: setting a modulation format of a Preamble code of a Preamble frame, and sending a symbol of the Preamble code by using the set modulation format; determining the modulation bit number of the SYNC frame according to the modulation order, determining the bit number of the SYNC code according to the supported sending format number, encoding the SYNC code, and mapping the encoded SYNC code to the SYNC frame; defining different modulation modes by using different SYNC codes, sending theSYNC code corresponding to the selected modulation mode in the SYNC frame, and modulating and sending the Data frame of the frame structure by using the selected modulation mode. By adopting the technical scheme of the invention, 2FSK is compatible, an M-FSK modulation technology can also be adopted, the error code problem caused by the spectrum utilization rate and a fading channel is solved, andthe coverage is effectively improved.

Description

technical field [0001] The present application relates to the field of information communication, in particular to an M-FSK modulation method, device and system. Background technique [0002] In low-power LPWAN (Low-Power Wide-Area Network, low-power wide-area network) wireless communication, because FSK modulation is simple and uplink power consumption is low, the physical layer often uses FSK technology. The existing frame format generally adopts a fixed modulation format, that is, 2FSK (Frequency Shift Keying, which is binary digital frequency modulation, also known as binary frequency shift keying), and the frame format is as follows: [0003] Preamble(2FSK) SYNC(2FSK) Data (2FSK) [0004] Among them, the Preamble frame is a random access preamble, which is used for frame detection; the SYNC frame is a synchronization code, which is used for frame synchronization and sends fixed bits; the Data frame is an information bit, and the information bit in a co...

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
IPC IPC(8): H04L27/10
CPCH04L27/106
Inventor 郑德来李卓群
Owner SHANGHAI JINGXING INFORMATION TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com