Selecting Wi-Fi Modules for High Interference Industrial Plant Environments
Selecting industrial Wi-Fi modules demands matching transmit power, receiver sensitivity, and hardware coexistence mechanisms to plant RF noise floor profiles.
Sensitivity
Meaning
Wireless receivers must detect and decode very weak signals to maintain reliable communication over long distances. This receiver performance metric, known as sensitivity, represents the minimum input signal power required to achieve a specified error rate or throughput. A more sensitive receiver can operate with weaker signals, which extends the effective range of the device.
This metric is typically measured in decibel-milliwatts and is a baseline factor in system design.
Noise Floor
The thermal noise generated by internal components limits the weakest signal that a receiver can detect. This baseline noise level, combined with the receiver’s noise figure, determines the practical limit of sensitivity.
Link Budget
Calculating the total path loss that a wireless system can tolerate requires knowing the transmitter power, antenna gains, and receiver performance. A higher sensitivity value allows the system to overcome greater path losses and maintain a stable connection over longer distances. This parameter is used by system planners to determine the optimal spacing between wireless nodes.
Signal Amplification
Low-noise amplifiers are used at the front end of the receiver to boost weak incoming signals before they are processed. This amplification increases the signal strength while adding as little noise as possible to the signal. Protecting these circuits from external noise ensures the receiver maintains its specified performance.