CSE3213_05_AnalogDigitalTransmissionW2012_Part_2 -...

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6 P in P out > Transmission Impairments: Attenuation (cont.) L vs. G ? out in P P L if >1, signal has lost power in out P P G if >1, signal has gained power L 1 G
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1. Signal strength often falls off exponentially, so loss is easily expressed in terms of decibels – linear function in log-plot. 2. The net gain or loss in a cascaded transmission path can be calculated with simple addition and subtraction . In figure below, a signal travels a long distance from point 1 to point 4. The signal is attenuated by the time it reaches point 2. Between points 2 and 3, the signal is amplified. Again, between points 3 and 4, the signal is attenuated. We can find the resultant attenuation just by adding the decibel measurements between each set of points. Why decibel (log function)? 3dB -7dB 3 dB -1 dB In this case, the attenuation can be calculated as: 3-7+3 = -1, which means that the signal has gained power.
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CSE3213_05_AnalogDigitalTransmissionW2012_Part_2 -...

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