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In some textbooks the channel defined to be not only the propagating medium, but it is considered to include some of the components of the transmitter and receiver, usually the analog parts. For example, you might read somewhere that the "channel introduces noise, power loss, etc." and this is true when the channel includes both the propagating medium as ...


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So, it's generally right that a receiver adds noise due to physics (Johnson-Nyquist noise). So, yes, in any system, at least part of the noise in the received signal is caused by the receiver. There's also noise that is background noise from e.g. cosmic sources that happen neither in the receiver nor the transmitter (and also aren't other transmitters ...


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This is a great question and comes down to the AGC design and optimizing the available dynamic range on the ADC, given a receiver minimum SNR, sensitivity and interference rejection requirements. I first need to know or establish these requirements and then usually start a receiver design from the ADC options available within the cost, power and technology ...


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