Account of gains and losses from transmitter to receiver.
The link budget sums transmit power, gains and losses to find received power: P_r=P_t+G_t+G_r-L_path-L_misc (dB). Compare with receiver sensitivity to obtain fade margin. Applies to satellite, cellular, Wi-Fi and fibre links.
A satellite link budget includes uplink, transponder and downlink segments.
A link budget adds up gains and losses from transmitter to receiver, so you can confirm that a link will work with enough margin.
Account of gains and losses from transmitter to receiver.
A link budget adds up gains and losses from transmitter to receiver, so you can confirm that a link will work with enough margin.
Transmit power, antenna gains, free space loss, other losses and the receiver sensitivity, combined in decibels.
The difference between the received signal level and the minimum required level, which provides protection against fading and other changes.
Typical applications include checking that a satellite link has a 3 dB margin in heavy rain, planning the range of a Wi-Fi access point through walls and specifying the transmit power needed for a radio sensor at 2 km.
Study "Antennas and propagation" first (topic 90 of 101 in Signals, Control & Comms). It covers the groundwork this topic builds on.
EIRP. Noise floor and required SNR. Margin for rain and fading.
A satellite link budget includes uplink, transponder and downlink segments.
The next topic is "Fading and multipath", which builds directly on this one.
It is classed as Advanced in Signals, Control & Comms (topic 91 of 101). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Signals, Control & Comms.
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