[Technical Discussion] How to troubleshoot electromagnetic interference in wireless communications?

chenjingjing

[Technical Discussion] How to troubleshoot electromagnetic interference in wireless communications? [Copy link]

Many customers have reported that electromagnetic wave interference in radio communications cannot be seen, touched, or presented. Sometimes, they encounter the following problem: for the same set of equipment in the same environment, wireless communication is very good at certain times, but the signal quality of wireless communication suddenly drops sharply at other times. What is going on?

Since there are many types of radio communication equipment on the market, including WiFi, ZigBee, LoRa, walkie-talkies, radio stations, etc., the electromagnetic wave environment is complex and diverse. As a manufacturer, we cannot completely simulate the user's on-site environment. Users can use the "WiMi-net Wireless Ad Hoc Network Management Platform" software (Download Center) to locate the problem and then solve it.

Methods for troubleshooting electromagnetic interference from third-party radio equipment in wireless communications:

In the "Channel Deployment" page of the "WiMi-net Wireless Ad Hoc Network Management Platform" software, click "Auto Search" to search for electromagnetic wave noise and observe the background noise (including average background noise and maximum background noise). Generally, in an interference-free environment, the average background noise value is around -105dBm, and the maximum background noise does not exceed -95dBm. If this value is 10dBm higher than that in the interference-free environment, it means that there is relatively strong interference nearby.

If the electromagnetic interference of third-party equipment is eliminated, after searching for the value, first select the one with the smallest "average noise floor". The smaller the "average noise floor", the less external interference. If the selected minimum "average noise floor" is the same, then select the one with the smallest "maximum noise floor". The smaller the "maximum noise floor", the less external interference. Try to choose the working channel of the wireless product in this way to avoid interference from external signals. As shown in the figure below, the wireless master station 0XB9C2, select the "4" channel with the smallest average noise floor of "-111dBm", which means the "0" frequency band is the optimal channel.

This search method is universal and can detect any wireless transmission behavior, regardless of the frequency of the electromagnetic wave and the signal format.

wangerxian

Both power meters and spectrum analyzers can be helpful in finding interference.

Fred_1977

Today’s electronic signal environment is very complex, interference is sudden, and evaluation is difficult.

annysky2012

So there is electromagnetic compatibility design.

预提虎牙

First, you need to find the frequency of the interference signal, and then find a suitable method to eliminate it.