• So far: only a single transmitter assumed
• Only disturbance: self-interference of a signal with multi-path
“copies” of itself
• In reality, two further disturbances
• Noise: due to effects in receiver electronics, depends on
temperature
• Interference from third parties
• Co-channel interference: another sender uses the same spectrum
• Adjacent-channel interference: another sender uses some other part
of the radio spectrum, but receiver filters are not good enough to fully
suppress it