Noise Figure and SNR KU ITTC（图和信噪比 KU ITTC噪音）.pdf

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Noise Figure and SNR KU ITTC（图和信噪比 KU ITTC噪音）.pdf

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Noise Figure and SNR KU ITTC（图和信噪比 KU ITTC噪音）

10/26/2006 Noise Figure and SNR 1/9 Noise Figure and SNR Of course, in addition to noise, the input to an amplifier in a receiver will typically include our desired signal. Say the power of this input signal is P in . The output of the s amplifier will therefore include both a signal with power P out , s and noise with power P out : n P in ,N P out ,P out s in s n G where: P out G P in s s and: P out N +G kT B n in e G k T =+T B ( in e ) In order to accurately demodulate the signal, it is important that signal power be large in comparison to the noise power. Thus, a fundamental and important measure in radio systems is the Signal-to-Noise Ratio (SNR): P SNR s P n Jim Stiles The Univ. of Kansas Dept. of EECS 10/26/2006 Noise Figure and SNR 2/9 The larger the SNR, the better! At the output of the amplifier, the SNR is: P out SNR s out P out n