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Wireless data communication method and device

A wireless data communication and signal technology, applied in the field of communication, can solve the problem of not being able to capture signals quickly and effectively, and achieve the effect of fast and effective signal capture and low SNR

Active Publication Date: 2018-06-29
SHENZHEN RENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiments of the present invention provide a wireless data communication method and device to solve the problem in the prior art that signals cannot be captured quickly and effectively under low SNR working conditions

Method used

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  • Wireless data communication method and device

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Experimental program
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Embodiment 1

[0071] see figure 1 , showing a schematic flow chart of the wireless data communication method of the present invention, detailed as follows:

[0072] Step S101, generating a sequence set of preamble symbols, wherein the set of preamble symbol sequences includes coarse synchronization symbols and fine synchronization symbols.

[0073] see figure 2 , showing the composition of the preamble symbol sequence. It can be seen from the figure that the preamble symbol includes two parts, a coarse synchronization symbol 201 and a fine synchronization symbol 202, which are respectively used for the coarse synchronization process and the fine synchronization process of subsequent received signals.

[0074] Optionally, the coarse synchronization signal 201 includes one or more continuous forward chirp signals and reverse chirp signals, and the fine synchronization signal includes a synchronization signal with an autocorrelation characteristic.

[0075] see image 3 , shows a coarse s...

Embodiment 2

[0127] Corresponding to the wireless data communication method described in the first embodiment above, a structural block diagram of a wireless data communication device provided in the embodiment of the present invention.

[0128] The leading symbol generating module is configured to generate a sequence set of leading symbols, wherein the sequence set of leading symbols includes coarse synchronization symbols and fine synchronization symbols.

[0129] The modulation module is used to modulate the digital signal to be sent to generate a modulated signal, and insert a set of preamble symbol sequences before the modulated signal to form a transmitted signal.

[0130] The synchronization module is configured to receive the transmitted signal, perform coarse synchronization and fine synchronization processing on the received signal, and obtain the timing deviation, carrier frequency deviation and carrier phase of the received signal.

[0131] The carrier adjustment module perform...

Embodiment 3

[0134] Corresponding to the wireless data communication method described in Embodiment 1 above, Figure 7 A structural block diagram of a wireless data communication device provided by an embodiment of the present invention is shown. For ease of description, only the parts related to this embodiment are shown.

[0135] see Figure 7 , the wireless data communication device includes a digital modulator 70 and a digital demodulator 71.

[0136] The digital modulator 70 is configured to generate a sequence set of preamble symbols, and modulate a digital signal to be transmitted to generate a modulated signal, and insert a sequence set of preamble symbols before the modulated signal to form a transmission signal; wherein, the set of preamble symbol sequences Including coarse synchronization symbols and fine synchronization symbols;

[0137] The digital demodulator 71 receives the transmitted signal, and performs coarse synchronization and fine synchronization processing on the ...

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Abstract

The invention provides a wireless data communication method and device, applied to the technical field of communication. The wireless data communication method comprises the following steps: generating a sequence set of preamble symbols, wherein the sequence set of the preamble symbols comprises coarse synchronization symbols and fine synchronization symbols; modulating a digital signal to be sentto generate a modulated signal, and inserting the sequence set of the preamble symbols before the modulated signal to form a transmitting signal; performing coarse synchronization and fine synchronization processing on a received signal to obtain the timing deviation, carrier frequency deviation and carrier phase of the received signal; performing timing recovery compensation processing on the received signal according to the timing deviation and carrier frequency deviation of the received signal; and performing carrier recovery on the received signal after the timing recovery compensation processing according to the carrier frequency deviation and the carrier phase. According to the invention, the coarse synchronization detection is carried out on the received signal first, and then thefurther fine synchronization detection is carried out on the received signal, which are based on the Chirp; therefore, the wireless data communication method can capture signals effectively under theworking condition of low SNR.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a wireless data communication method and device. Background technique [0002] Wireless low-power wide-area network is a long-distance wireless communication technology that emerged to meet the needs of the Internet of Things. This communication technology requires devices to have low receiving sensitivity and devices to work at low power consumption and low cost. . [0003] According to Shannon's theorem, reducing the communication service rate is the most direct and effective means to improve receiving sensitivity. When other overheads such as spread spectrum and FEC are not considered, the service rate can be effectively reduced by reducing the symbol rate of the physical layer at the same time, but excessively reducing the symbol rate of the physical layer It will bring about a decrease in the effective bandwidth Bw of the signal, which may be limited by th...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/00H04B1/7075
CPCH04B1/7075H04L27/0014H04L27/2662H04L27/2663H04L27/2665H04L2027/0026
Inventor 陈力赵琮吴晓立丘聪陈世超丘家行
Owner SHENZHEN RENERGY TECH
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