Digital signal processing method based on wia-pa wireless gateway

Abstract

The invention relates to a digital signal processing method based on a WIA-PA wireless gateway, comprising the following steps: sampling a received radio-frequency signal and obtaining a wireless signal by passing through a digital control oscillator; performing power control and channel selection to the wireless signal and performing interference suppression processing according to selected channel; obtaining received original data by passing through bit synchronization, OQPSK demodulation and OQPSK despreading. The digital signal processing method based on the WIA-PA wireless gateway of the invention can be used for restraining interference, increasing wireless environment adaptive capacity of WIA-PA industry network and avoiding abundant manual survey and debugging work. The digital signal processing method based on the WIA-PA wireless gateway of the invention can be used for recovering the original signal to the largest extent via a bit synchronization method and recovering the original signal via correlation detection even being influenced by the interference.

Description

technical field [0001] The invention belongs to the field of industrial internet of things, and in particular relates to a digital signal processing method for an industrial wireless gateway applied in an industrial control system capable of self-adaptive frequency conversion digital baseband interference suppression. Background technique [0002] The WIA-PA industrial wireless network, WLAN, and Bluetooth devices work on the 2.4G public frequency, and the interference they receive increases; its low power consumption determines that the transmit power of the node module is usually less than 100mW when it is working. In addition, its operating frequency bandwidth is 5MHz, which is not conducive to the lossless transmission of signals. [0003] The working bandwidth of the WIA-PA industrial wireless network is 83.5MHz, and most ADCs cannot meet such a wide sampling bandwidth; even if it is satisfied, the increase in cost is unacceptable. The physical layer protocol processin...

AI Technical Summary

Problems solved by technology

[0002] The WIA-PA industrial wireless network, WLAN, and Bluetooth devices work on the 2.4G public frequency, and the interference they receive increases; its low power consumption determines that the transmit power of the node module is usually less than 100mW when it is working. In addition, its operating frequency bandwidth is 5MHz, which is not conducive to the lossless transmission of signals

[0003] The working bandwidth of the WIA-PA industrial wireless network is 83.5MHz, and most ADCs cannot meet such a wide sampling bandwidth; even if it is satisfied, the increase in cost is unacceptable

The physical layer protocol processing is all completed by IC, and the scalability, system adaptation and function scalability are poor

[0004] At present, there is no similar digital baseband interference suppression technology in the industry. It must be filtered through the filter integrated in the physical layer chip itself. However, the performance of this filter cannot meet the application in complex sites. It requires a lot of manual survey and debugging before and after networking. The work is not only inefficient, but the effect is not significant, and there have been many failed application cases

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