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A wireless frequency offset automatic calibration method and system

An automatic calibration and frequency offset technology, applied in wireless communication, advanced technology, synchronization devices, etc., can solve problems such as inability to communicate with Wi-Fi chips, and achieve the effect of ensuring normal communication

Active Publication Date: 2022-08-09
ESPRESSIF SYST SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above three problems, if the Wi-Fi chip is used in a high-temperature environment, the frequency deviation may reach 60-120ppm, and it will not be able to communicate with other Wi-Fi chips normally.

Method used

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  • A wireless frequency offset automatic calibration method and system

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Embodiment

[0053] Taking the Wi-Fi wireless transmission module as an ESPWi-Fi chip as an example, the specific implementation method of the wireless frequency offset automatic calibration of the Wi-Fi wireless transmission module in different working modes is described in detail. It is worth noting that the present invention is not limited to ESPWi-Fi -Used on the Fi chip, as long as it is a WiFi chip that can determine the frequency offset of the received data packet, the method of the present invention can be used to realize the automatic calibration of the wireless frequency offset. In this embodiment, taking an ESP8266 Wi-Fi chip as an example, it can obtain the frequency offset value of this device by receiving data packets of other Wi-Fi devices, and for the STA, SoftAP, STA&SoftAP run by the Wi-Fi wireless transmission module The three different working modes of the , respectively, corresponding to the following different calibration schemes 1, 2, and 3:

[0054] 1. When the Wi-F...

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Abstract

The invention discloses a wireless frequency offset automatic calibration method, which comprises: S1, a Wi-Fi wireless transmission module monitors other APs or scans specific data packets of a designated communication AP; S2, a Wi-Fi wireless transmission module according to the specific data packets Information acquisition frequency offset; S3, Wi‑Fi wireless transmission module performs frequency offset tracking according to the frequency offset. The advantage is that the Wi‑Fi wireless transmission module can be close to the theoretical center frequency of the designated communication device, so that it can be used normally at various temperatures, ensuring the normal communication of the Wi‑Fi wireless transmission module.

Description

technical field [0001] The invention relates to a wireless frequency offset automatic calibration method and system. Background technique [0002] Wi-Fi can work in the 2.4GHz or 5.8GHz band, usually each channel occupies 20MHz bandwidth, or can use the bandwidth defined by protocols such as 5, 10, 40, 80, 160MHz, etc. The center point of each channel frequency is the channel center Frequency. When the Wi-Fi chip monitors or transmits on a certain channel, there will be a frequency offset between the center frequency points of the two communicating parties. The protocol stipulates that the frequency offset (frequency offset) is less than 20ppm. [0003] The error of the Wi-Fi chip positioning center frequency point is usually related to the crystal oscillator used, and the frequency offset of the crystal oscillator is related to the ambient temperature. Generally, when the temperature is 120 degrees Celsius, the frequency offset of the crystal oscillator is 60-120ppm, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W24/08
CPCH04W24/08H04W56/0035H04W56/002H04W84/12H04W48/16
Inventor 商轲刘致富黄平
Owner ESPRESSIF SYST SHANGHAI