Hey everyone, thanks for coming back to Wi Fi fundamentals with location and analytics. This course will help you to muster the air. We have started to touch upon free space path loss, and even made some calculation to find out the signal loss over a one meter from an access point that transmits in the 2.4 gigahertz frequency. In our calculations, free space path loss factors were frequency and distance. We didn't take into account the antenna and the transmission power, the gain of the antenna can decrease the loss by a certain decimal value. Let's make free space path loss even simpler using absolute values.

So we have a setup which consists of two Access Point, the first one transmit, and the second one access the receiver. Let's look at the basic parameters, label them, and then add the numbers. Our transmitter power will be labeled as PT, its antenna gain will be labeled as GT. The path loss, the path that the signal goes to travels and attenuates will be labeled as LP. Our receivers antenna gain will be labeled as gr and its received power will be labeled as PR. Let's add some numbers.

Our transmitter has a power of 15 but its antennas gain will double the transmitter power. The path loss will be 15 and the receivers antenna gain is two times What is the received power? the received power is also known as the station's received sensitivity. What is the least power station or an access point can still decode frames. We'll start with the transmission power at 15 volt, we multiplied with the antennas gain we get 30 volt power over the path the power decreases by a factor of 15 times. So we divided in 15 we get to reflect the received power at the other side is too much, but it has it has an antenna which increases the power the antennas game doubles the signal and we have a received power off for that.

So the power received at the other side is for what we can calculate it using that equation, the power that is being transmitted 15 VAT, multiply it with the antenna gain, the transmitters antenna gain multiplied with the receivers antenna gain and divided with the path loss. the received power is for VAT next up we are moving to the real thing rssi the received signal strength indicator, it is probably the most popular method nowadays to measure raging See you soon