Hey guys, thanks for coming back to WiFi fundamentals location and analytics. This course will help you to muster the air. We have spoken of waves and waves tend to lose their power and faith. This is our topic today RF loss. Our influence is something you want to avoid in your network, but it happens as a second nature to RF behavior to facts that are good to remember, free space path loss is the number one reason for signal loss. interferences are everywhere and you can do a lot to avoid them when planning your WiFi network.
So what will you learn? We will look at what causes a loss what is the free space path Last theoretical module, we will look at different types of interferences that you are about to witness on your Wi Fi network, what is the receiver sensitivity and what does it have in relation with data rate? What is rssi and what is a signal to noise ratio. When RF wave spreads in the air it will most often meet obstacles, it can be trees, people walls, just about anything. Depending on the type of the obstacle it will be reflected refracted and sometimes even observed some of the signal will arrive in short delay and some will have a phase shift. This phenomenon is called multi path.
Many times do a tune Receiving the signal, our station will retransmit the phrase over and over again, free space path loss. This is a key topic that we will dedicate a treat part video. But in short, when your Wi Fi signal goes into space, it attenuates. Just like your sound wave when we talk, the farther you are the weaker the energy carried by your wave. free space path loss is based on the inverse square law and frequency propagation. I promise you we will deal with each respectively.
Assuming the same transmission power higher frequency waves tend to attenuate more than lower frequency. You will see it all over. When 2.4 gigahertz transmit, they're much more immune to interferences than the five gigahertz frequency devices. Whenever if loss is witnessed in the air due to interferences or free space path loss, our signal degrades and we can't achieve high data rates. That is the receiver sensitivity. The minimum loss acceptable in order to achieve a good data rate.
A station that is close to the access point can use a high data rate. As it gets farther away, it has to use lower data rate. Vendors tend to report receiver sensitivity in their product spec sheet. Look for their different devices have different receiver sensitivity. And when you plan your network for location and analytics, think always about your weakest receiver sensitivity vices Next up are floss part two. See you there.