4-SNR and Noise Figure

# 4-SNR and Noise Figure - MULTI STAGE SYSTEM PROBLEM SET 2 1...

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PRINCIPLES OF COMMUNICATIONS 4 SIGNAL TO NOISE RATIO AND NOISE FIGURE

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SIGNAL TO NOISE RATIO Comparison of noise and signal at any point to ensure that the noise is not excessive. An important parameter used to determine how well the system will operate or how successfully the system can recover a weak signal. Shows how much stronger (or weaker) the desired signal is as compared to the unwanted noise.
NOISE FIGURE Defined as the dB ratio of the input signal and noise ratio to the output signal and noise ratio. A measure of how much noise a component (amplifier) adds to the signal Noise figure provides information on how much noises will certain equipment such as receivers will add to the incoming signal. A noise free amplifier is said to have a noise figure of 0dB.

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EFFECT OF RECEIVED NOISE IN A

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Unformatted text preview: MULTI STAGE SYSTEM PROBLEM SET 2 1. Determine the overall gain of the satellite system and the power at the loudspeaker. 2. Determine the noise figure of an amplifier whose input signal is 1 W, the input noise is 0.01 W, the output signal is 10 W, and the output noise power is 0.3 W. 2. A certain satellite communications link (shown in figure 1) has a transmitted output power of 0.5W. This power is effectively increased in the direction of transmission by the transmitter antenna, which has a gain of 20dB. The RF signal is attenuated by a path loss of 200dB. The total noise level at the receiver input is estimated to be 2dBf. The desired signal to noise ratio at the receiver input is 15dB. Determine the minimum antenna gain G r (dB) that will meet the specifications. END...
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4-SNR and Noise Figure - MULTI STAGE SYSTEM PROBLEM SET 2 1...

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