Signal Processing Stack Exchange
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Questions tagged [snr]

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.

SNR is defined as the ratio of signal power to the noise power. A ratio higher than 1:1 indicates more signal than noise. While SNR is commonly quoted for electrical signals, it can be applied to any form of signal (such as isotope levels in an ice core or biochemical signaling between cells). Signal-to-noise ratio is sometimes used informally to refer to the ratio of useful information to false or irrelevant data in a conversation or exchange.

Source: Wikipedia – Signal-to-noise ratio

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SNR calculation

i have two audacity files, one includes noise data and the other includes signal data. how do I calculate noise to signal ratio between the data in these two files? thank you
Najla Kassis
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Relationship between SNR and link speed

I've been trying to model some radio signal properties of wireless networks wrt its usefulness. For example, most WiFi network adapters would decrease their transmission rate if the overall quality of the signal is bad so as to avoid…
vmivanov
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Comparison of SNR achieved by different weighting schemes

I am reading a paper about High Dynamic Range (HDR) reconstruction. One of the core problems there is how to reconstruct pixel irradiance from multiple observations. Typically, weighted averaging is used; a number of weighting schemes were presented…
taketwo
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Question about SNR in continuous and discrete domain

How to make sure the discrete domain's SNR equals to the corresponding SNR of continuous domain? If the definition of SNR in continuous domain is: $$SNR=\frac{\int_T|s(t)|^2dt}{noiseVariance} $$ if we sampled $s(t)$ ($T_s$ is the sample period)…
Tj L
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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 used the following commands: snr_before =…
me001
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What's the minimum nearest neighbour approximation of this?

What's the minimum nearest neighbour approximation and upper approximation of this? Consider a modulation design with the signal space diagram illustrated in the figure below. The signals are transmitted over an AWGN channel with power spectral…
kile
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Adding Noise to a normalized signal

I saw this adding noise to a signal but I still have some questions. I have normalized IQ data of a signal. Lets suppose that I know what the current SNR is (say 8dBm). How can I add noise to the I and Q components of my signal so that it has a new…
CakeMaster
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Calculate SNR from packet error rate on micro-controller unit

I have the problem of calculating the Signal to Noise Ratio for a packeted transmission using FSK or BPSK modulation with convolutional coding on a micro controller unit which communicates with an RF chip (AX5043). The only information that is…
Sleepwalkr
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How do I calculate the noise variance in this problem?

In a paper about radar, the transmitted signal expressed in low-pass equivalent form is given by $\sqrt{E}s(t)$, where $E$ is the transmitted energy, $s(t)$ satisfies $$ \int_T | s(t) |^2 dt = 1, $$ and $T$ is the pulse duration. Here $$ s(t) =…
Tj L
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For the same SNR, does gaussian noise has the minimum BER?

Let me simplify the question: assuming a PAM-4 signal {-3,-1,1,3} with noise added. I focus on the BER for the signal 1. My question is: with same noise power, does Gaussian noise have the minimum SNR?
DanielB
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Relationship between received SNR and Eb/N0

I want to show the bit error performance of a communication link using QPSK in a system containing a channel and antennas. The resulting received SNR is calculated by: $$ SNR(f) = \frac{P_\text{t} \cdot H(f)}{\text{k}_\text{B} \cdot T \cdot B \cdot…
finalr
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SNR calculation from signal samples

Is it possible to calculate the SNR from finite duration time-domain samples that contain the received signal, $y(t)$, where: $$ y(t) = x(t) + n(t) $$ and $x(t) =$ transmitted signal, and $n(t) =$ AWGN noise The signal $y(t)$ is complex baseband,…
BigBrownBear00
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Confusion about decibels

I know that $\text{dB}$ actually represents dimensionless value, meaning, it is the ratio of two values that have the same dimension, for example: $$p_1=10\log\frac{P_1}{P_0} $$ This can be expressed in decibels if $P_0=1\text{ W}$, however, if…
cdummie
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Why does SNR have an impact on the bit rate?

I have some confusion regarding the impact of SNR on the bit rate. For example, if I have a QPSK-OFDM system, then my bit rate will be 2bits mutiplied by the number of sub-carriers of the OFDM modulation over the symbol time. How can I account for…
ala
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How to evaluate quality of signal?

I'm trying to evaluate received signals from a transceiver. I want to make a threshold of received signals so that we can say some signals are meaningless. I have learnt something about Signal-to-Noise-Ratio (SNR) and Received-Signal-Strength (RSS).…
Mr.Budapest
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