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A receiver receives a desired signal always in the presence of electronic noise, which is everpresent. If the signal becomes too weak relative to the noise, or other noise-like signals in the receive band increase due to a natural or man-made source, then signal-to-noise ratio (SNR) is said to be degraded. Every receiver has a minimum SNR that it needs for proper operation, otherwise the system can not distinguish information from random noise.

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