SNR/Wi-Fi signal strength map
A signal strength map, or SNR map, is quite similar to a Wi-Fi coverage map (heatmap), but this type includes Wi-Fi signal to noise ratio when graphically displayed. Wi-Fi SNR data collection and map generation features are now included in the latest version of Acrylic Wi-Fi Heatmaps wireless coverage analysis software. Signal to noise ratio (SNR or S/N) is defined as the proportion between the propagated signal strength and the interfering noise power. SNR is measured in decibels. This Wi-Fi signal strength map is generated during a passive site survey by measuring Wi-Fi signal strength and Wi-Fi interferences to help identify well performing areas with stronger Wi-Fi signal. SNR signal level is calculated as the difference between signal strength and noise (SNR stands for ‘Signal to Noise Rate’). These values are required to generate Wi-Fi signal strength maps. The higher the value, the better the user experience, transmission speed, and Wi-Fi communication stability. The generation of this type of map requires measurements using an Airpcap NX card set on monitor mode, or Wi-Fi measurements on normal capture mode, which are compatible with all wireless cards.