This section describes WiFi calibration parameters

WiFi products need us to manually measure and debug the WiFi power information of each product, so how much do you know about the parameters of WiFi calibration? Let me introduce it to you below:

1, TX Power: refers to the wireless product transmitting antenna working power, the unit is dBm. The power of wireless transmission determines the strength and distance of wireless signals. The greater the power, the stronger the signal. In a wireless product design, there is a target power as the basis of our design, in the premise of meeting the spectrum plate and EVM, the greater the transmission power, the better the performance.

2. RX Sensitivity: a parameter that characterizes the reception performance of the object to be tested. The better the reception sensitivity is, the more useful signals it will receive and the larger its wireless coverage. When testing the receiving sensitivity, make the product in the receiving state, use the WiFi calibration device to send specific waveform files, and the product receives. The power level of sending can be modified on the WiFi calibration device until the packet error rate (PER%) of the product meets the standard.

3. Frequency Error: represents the magnitude of the deviation of the RF signal from the center frequency of the channel where the signal is located (unit PPM).

4, error vector amplitude (EVM) : is an indicator to consider the quality of the modulation signal, the unit is dB. The smaller the EVM, the better the signal quality. In a wireless product, TX Power and EVM are related, the larger the TX Power, the larger the EVM, that is, the worse the signal quality, so in practical applications, to take a compromise between TX Power and EVM.

5. The frequency offset template of the transmitted signal can measure the quality of the transmitted signal and the interference suppression ability of the adjacent channel. The spectrum template of the measured signal is qualified within the standard spectrum template.

6. Channel, also known as channel and frequency band, is a data signal transmission channel with wireless signal (electromagnetic wave) as the transmission carrier. Wireless networks (routers, AP hotspots, computer wireless cards) can run over multiple channels. In the range of wireless signal coverage of various wireless network equipment should try to use different channels to avoid interference between signals.