SNR calculation for conventional AM small noise caseSolutio

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SNR calculation for conventional AM small noise case?

Solution

1. In practical applications, the modulation index a is in the range of 0.8-0.9.
2. Power content of the normalized message process depends on themessage source.
3.Speech signals : Large dynamic range, PM is about 0.1.
4. The overall loss in SNR, when compared to a baseband system, is a
5.factor of 0.075 or equivalent to a loss of 11 dB.
6. The reason for this loss is that a large part of the transmitter power is used to send the carrier component of the modulated signal and not the desired signal.
7.In this case, the demodulator detects the envelope of the received signal and the noise process.