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A 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: 2022-04-15
SHANGHAI JINGXING INFORMATION TECH CO LTD
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  • 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

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  • A m-fsk modulation method, device and system
  • A m-fsk modulation method, device and system
  • A m-fsk modulation method, device and system

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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...

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Abstract

The present application discloses an M-FSK modulation method, device and system. The method includes setting the modulation format of the Preamble code of the Preamble frame, and using the set modulation format to send the symbols of the Preamble code; determining the number of modulation bits of the SYNC frame according to the modulation order, and determining the SYNC code according to the number of supported transmission formats The number of bits, encode the SYNC code and map it to the SYNC frame; use different SYNC codes to define different modulation methods, send the SYNC code corresponding to the selected modulation method in the SYNC frame, and use the selected modulation method to frame The Data frame of the structure is modulated and sent. The technical solution of this application is not only compatible with 2FSK, but also can use M‑FSK modulation technology to solve the problem of spectrum utilization and bit errors caused by fading channels, and effectively improve coverage.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/10
CPCH04L27/106
Inventor 郑德来李卓群
Owner SHANGHAI JINGXING INFORMATION TECH CO LTD
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