Inside Wireless: Link Budget

The equation essentially calculates the power for an RF signal on the receiver side considering three main components:
- Power provided by the transceiver radio
- Gains of antennas on both sides of a link
- Any loss that occurs during the transfer

The loss component is composed of many parts:
- cables + connectors introduce power loss and reflection
- atmospheric conditions dissipate the wave power depending on the frequency of the signal
- multipath reflections cause random attenuation
- polarization mismatch results into power loss as well

In reality, parts of the loss can be often neglected while still maintaining good accuracy of the calculation. Naturally, the biggest loss factor is the most important, so if a cable loss is a fraction of dB, it can be ignored.

Nevertheless, the calculation of link budget is always an estimate that can be done manually on paper, but most of the manufacturers in the WISP industry have a link calculator that does the math for you with varying level of detail - some include trees, maybe weather, but very few include multipath propagation due to the computational intensity when modeling it.

0:00 introduction
0:12 The equation
1:04 Loss components
1:51 Loss & MCS rate connection
2:00 Link calculator

#RFelements #InsideWireless #LinkBudget #Antennas #AntennaTheory #WISP #SaveSpectrum #RejectNoise #growsmart #UbiquitiNetworks #CambiumNetworks #MimosaNetworks #Mikrotik

[Rfelements]

What tool do you use to calculate link budget? Or maybe you still do it by hand?

[telecommunicationstraining]

Great work sir..I have my channel Telecommunication portal but this channel is in my native language . Iam very well experienced in wireless and fixed networks i will make my channel in English language very soon so that other nationalities may also get benefits.

[chipotle]

Wonderful video! Great explanation with nice visualization. Thank you!

[aysuc]

Thank you very much for this great explanation. I've got a question.
How Amplifiers/ Low Noise Amplifiers should be taken into consideration for link budget calculation?
Thanks in advance.

[manrajsharma]

Thanks for the Video. Got one question:) So What factor is NOT taken into account when calculating the Link budget of a point-to-point link

[bstanis]

Thank you so much,
Please, how much is the receiver sensitivity (in dBm) of WiFi (IEEE 802.11 n) that should be received by mobile end-user to achieve good signal detection?
for example 40 MHz WiFi signal (OFDM modulation) of 65 Mbps transmitted over multipath wireless channel?
I'll so thankful to you :)

[kubtastic]

Although it's true that the frequency affects the path loss isn't the frequency also going to affect G_TX in reverse? Which is dominant?

[elim]

Please decrease the speed of teaching a little bit.