# Tagged Questions

Signal-to-noise ratio (often abbreviated SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise.

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### Understanding SNR in fading channels and MIMO systems

Signal to Noise ratio plays an important role in understanding the performance of any communication system. I understand the basic concepts of SNR but I am having trouble when trying to bring in a ...
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### Why is PSNR used for image quality metrics instead of SNR?

I have been trying to determine why is PSNR used instead of SNR for image quality metrics? I have read through several books and most just say that PSNR is used instead of SNR, but don't give a ...
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### Signal to noise ratio for Word in noise

I want to mix several monosyllabic word with multitalker babble. I uses Adobe audition for measuring rms of the both. Duration of the word is less than 600 ms. Could I use this equation for SNR?: SNR=...
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### How to get SNR if we only have output noisy signal?

I only have access to a noisy signal obtained from a sensor which was kept static. I did apply filters to smoothen the signal: Zoomed in: So, it is visible that the amount of variation in the ...
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### GNSS carrier to noise ratio in digital

I'd like to know, how can I calculate the carrier-to-noise ratio (C/N0 in db-hz) of the GNSS signal. For example I have a 2048 complex samples of the signal right after the matched filter. So I have ...
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### Calculate signal to noise ratio from the Hillbert envelope of a stacked signal

I am working with seismic waveforms and more specifically with a stack of years of daily seismograms, that I would call the reference waveform. I am trying to calculate the SNR for each daily ...
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### How to calculate SIR when the min signal level is greater than 0?

I want to calculate the signal to interference ratio. The type of noise I consider here is the intersymbol interference (ISI). Usually the SNR is calculated as the ratio between the integral (i.e. ...
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### Does the quality of the pictures taken by a USB 3.0 camera depend on cable length?

I've got a JAI GO-5000-USB camera and have tried several cable lengths, ranging from 40cm to 5m. So far, I haven't observed many differences in the quality of the pictures I've taken. Since I want ...
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### Calculating SNR for ECG signals

I'm reading through the literature for finding the best way to calculate SNR for a ECG signal. While there are many algorithms for improving SNR, I couldn't find any that details any standard ...
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### How to calculate SNR before and after filtering for noise cancellation in an ecg signal in matlab?

I am working on noise cancellation in ecg signal and I want to calculate the Signal to noise ratio(SNR) before applying filter to the signal and after applying filter i.e., snr_before and snr_after. I ...
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### How can noise be added to a signal to obtain a specific SNR?

How can I add noise to a recording to obtain a SNR value provided by the user? I am tryin to test the effects of noise on my algorithm. Is there any function or app for doing that kind of task? Thank ...
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### Sampling rate effect on quantizer SNR

I am currently reading the 'Coding' chapter on Rabiner & Schafer's Book on speech processing. In one of its exercises, the reader is given a simple A/D converter using 16-bit uniform ...
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### How to determine SNR from FFT of measured data?

I am doing impedance measurements, where I do a frequency sweep of a test current, and I measure the resulting voltage. Offline, I compute the FFTs of the voltage and current, and I want to make sure ...
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### Exercise related to frequency resolution and SNR

I'm studying a book aboud dsp and trying to make excercises. Here is one I'm interested in: A scientist acquires 65,536 samples from an experiment at a sampling rate of 1 MHz. He knows that the ...
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### SINR averaging in communication system

Under the simulation of a communication system suffering from noise (AWGN) and co-channel interference, what is the appropriate way of calculating SINR? Could one calculate it at a packet level as: \$...
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### What is OSNR in Fiber Optics?

I have seen that the SNR is measured for optical fibers "OSNR". What is the difference? Is there any equivalent?
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### Adding white noise to complex signal (complex envelope)

Good day everyone. So, i run in to trouble - how to add white noise to signal samples? For now i'm working with MSK signal - quadrature modulator and quadrature demodulator + viterbi processor. My ...
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### Can I compute signal-to-noise ratio on a vector-valued or multi-channel signal?

I have a dataset that contains multiple channels recorded over time (think EEG or EMG), and I'm working on a computational model for this data. When I have a working version of the model, I'd like to ...
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### Measure the SNR of a signal in the frequency domain?

How do you measure the SNR of a sinewave in the frequency domain? (Assuming no filtering.) Suppose: $$x(n) = s(n) + n(n)$$ Create the signal (nCycles of a sinewave) in MATLAB...: ...
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### High SNR value unacceptable

I am stuck in a situation here while calculating received SNR in AWGN channel. When I performed calculations directly in decibels, I got very high SNR value for instance 140 dB. I am using the ...
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### How to separate a low amplitude signal of same frequency but different phase

I have a signal consisting of two sine waves of same frequency but have different phase (and also a lot of hf noise). Their amplitudes differ by about 120dB. How to I go about separating them? SNR is ...
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### Relationship between entropy and SNR

In general any form of enropy is defined as uncertainty or randomness. In a noisy environment, with increase in noise, I believe that entropy increases since we are more uncertain about the ...