Scribd
Upload
102 views3 pages

Signal-to-Noise Ratio & Eye Diagrams

This document discusses an experiment involving adding noise to signals and measuring signal-to-noise ratio (SNR). It asks questions about identifying the type of noise added, how SNR is calculated and affected by different noise levels, and the relationship between noise, bit-clock frequency, and eye diagram size. Specifically, it found that white noise was added, SNR decreased with higher noise levels, and greater noise or higher bit-clock frequency led to smaller eye openings on eye diagrams.

Uploaded by

Marven Yuson
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
102 views3 pages

Signal-to-Noise Ratio & Eye Diagrams

This document discusses an experiment involving adding noise to signals and measuring signal-to-noise ratio (SNR). It asks questions about identifying the type of noise added, how SNR is calculated and affected by different noise levels, and the relationship between noise, bit-clock frequency, and eye diagram size. Specifically, it found that white noise was added, SNR decreased with higher noise levels, and greater noise or higher bit-clock frequency led to smaller eye openings on eye diagrams.

Uploaded by

Marven Yuson
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 3

ECE 106.

1
EXPERIMENT 9-1 VOL2. SIGNAL-TO-NOISE RATIO and EYE
DIAGRAMS

Lab results:
Adding noise to a signal

Band limiting the noisy signal

Question 1
Based on its appearance, what type of noise is the noise generator module modelling?
 White noise

Question 2
Which of the noise generator’s outputs provides the most amount of noise?
 0db
Question 3
Why doesn’t the digital data signal look as “noisy” now as it did before?
 The channel being modelled by the baseband LPF has a frequency response that is removing
many of the sinewaves on the Noisy Generator module’s output.
Question 4
What is the signal-to-noise ratio actually telling you?
 It tells about how many times bigger the signal’s RMS voltage is compared to the noise’s RMS

Question 5
Why are the two signal-to-noise ratios almost identical even though they’ve been calculated in a
different way?
 It is because the SNR is so high

Question 6
What would you expect to happen to the SNR figures if the noise generator module’s -6db or 0db
outputs are used?
 SNR would go down

Question 7
What other change to tha signal-to-noise figures would you expect to see if you used the noise
generator module’s other outputs?
 The error between SNR figures and alternate SNR figures would increase

Eye diagrams
Question 8
What is the relationship between the level of noise that the channel introduces to the digital
data signal and the size of the Eye diagram eyes?
 The greater the noised that’s establish, the more closed the eyes

Question 9
What is the relationship between the digital data signal’s bit-clock and the size of the Eye
diagram eyes?
 The higher the frequency of the bit-clock, the greater than band-limiting and the more
closed the eyes

You might also like