Bftsync logo
Talk to Our Experts:


What exactly is SNR and how does it influence your signal?

What exactly is SNR and how does it influence your signal?

Written by Sadia Jahangir
24th Dec, 2022

What is meant by SNR?

SNR, which can also be written as S/N ratio, is an abbreviation for “Signal to Noise Ratio.” The noise level is the ratio of the signal power to the power of all other electrical signals in the area. The Root-Mean-Square (RMS) value of the fluctuations over time is used to measure noise. The measurement of this ratio is in decibels (dB).

SNR can also be defined statistically as the ratio of the mean to the standard deviation. However, we will concentrate on SNR in relation to wireless communications for the purposes of this article.


SNR is what? Why is SNR so significant?

A very technical definition of SNR can be provided. It basically serves as a balance beam between the signal and noise power of your system. Your overall SNR value will be higher or lower depending on how high the value on one end is in relation to the value on the other. Simply put, SNR tells you how usable your signal will be.

The signal is clearer if the SNR value is higher. With a lower value, you begin to introduce static, or Gaussian noise, into your network. As the value gets closer to 1, the static gets worse. Your network’s signal processing capabilities are harmed as a result of the noise, which results in random noise and amplitude modulation. The signal ceases to be usable if the SNR value falls below one. The term for this is “noise floor.”

Data corruption may cause retransmissions between the transmitter and receiver for signals close to the noise floor. Since the retransmitted signals will take up airtime in the wireless environment, this will reduce wireless throughput and latency. The channel’s data throughput also goes up when SNR goes up. This indicates that an increase in noise will result in a decrease in data throughput for a given signal level. The less space available for the actual data that is being transmitted on the channel, the higher the level of noise.

The environment’s background noise influences the noise floor. One of the extraordinary difficulties in giving cell, radio, and Wi-Fi is giving sufficient transmission solidarity to transcend some other types of obstruction. In such circumstances, raising the signal level will be beneficial.

What is a good value for SNR?

The kind of signal you’re working with will determine whether or not your SNR value is adequate.In general, you want the highest possible SNR value. The basics are as follows:

  • >40dB SNR = Excellent signal (5 bars). Lightning fast, always associated
  • 25dB to 40dB SNR = Very good signal (3 – 4 bars). Very fast, always associated
  • 15dB to 25dB SNR = Low signal (2 bars). Usually fast, always associated
  • 10dB – 15dB SNR = Very low signal (1 bar). Mostly slow, usually associated
  • 5dB to 10dB SNR = No signal, almost never associated, agonizingly slow

These values were provided by Wireless-Nets.

However, different SNR levels will be needed for different networks to work properly. Because data networks’ speed isn’t as important to their function as voice networks’, for instance, they don’t need as high a ratio. Even with 20 dB of SNR, a data network can still function quickly. However, in order to consistently deliver crystal-clear voice and excellent signal quality, a voice-over network like cellular or Voice-Over LTE will need a higher SNR value.

How is SNR determined?

SNR calculations can be straightforward or intricate. You can subtract the quantity of noise from the desired signal if your SNR measurements are already expressed in decibels: This is because subtracting logarithms is the same as dividing normal numbers, so SNR = S – N.

The difference between the numbers is equivalent to the SNR .For instance, if you measure a radio signal with a strength of -10 dB and a noise signal with a strength of -50 dB, the SNR is 40 dB. A very favorable signal-to-noise ratio!

Divide the value of the desired signal by the amount of noise for more complicated calculations. Then, compute the result’s common logarithm, or log (S N).After that, divide by 20 if the measurements of signal strength are in watts (power).However, you will multiply by 10 if they are voltage units.

SNR is equal to 20 log (S N) for power and 10 log(S N) for voltage. Additionally, the SNR in decibels is the result of the calculation. For instance, your deliberate commotion esteem (N) is 2 microvolts, and your sign (S) is 300 millivolts. A Fourier transform is used to represent the SNR, which is 10 log (.3 .000002), or approximately 62 dB.

Did you get that? When you try to add SINAD to the mix, it can get even more complicated, but we’ll stop there because this is already much more complicated than you probably expected. Your odds of winning are significantly reduced.

Low Signal-to-Noise Ratio: What Causes It?

Noise disturbs all real measurements. Numerous factors influence an environment’s background noise level, including phenomena like wind, rain, snow, temperature, humidity, and the moon’s gravitational attraction, among others, are power spectral density phenomena in electronic systems.

Density of sound and radio waves Magnetic fields The most common causes of a low signal-to-noise ratio are a weak input signal (or the signal in your environment) and abnormally strong nearby electrical currents, such as those from transmission lines, generators, power plants, and so on.The noise floor can also be raised by numerous smaller sources of noise in a small space, such as mobile phones or computers.

How to Make Your SNR Better

Your SNR can be improved in two obvious ways:

  • Enhance the signal strength
  • Lessen the amount of background noise in your area

Both of these are largely within your control. For instance, it will be very difficult to silence a significant transmission line and lower your noise floor if you are right next to one. However, if you have a large server hub, removing a few unnecessary servers may significantly improve wireless signal clarity.

There is a way to boost the power of your cellular signal. They are called “cell phone signal boosters” and significantly boost a building’s signal strength.

How Can We Help?

The most well-known manufacturer of cellular signal boosters is Bftsync. For home, office, or vehicle use, cell phone boosters can amplify 5G, 4G, LTE, and other networks for any phone with any carrier. They work best with an antenna pointed toward the nearest cell tower.

We truly detest dropped calls and poor coverage, so one satisfied customer at a time, we want to rid the world of spotty signals:

  • Contact our US-based customer support at for a complimentary consultation or call us at 1-281-616-5786 to ask us anything.
  • Free delivery.
  • Better signal or you’ll get your money back in 90 days.
  • We offer lifetime technical support and a two-year warranty on all products because we want everyone to be happy.

If you have any questions, we are happy to assist.

Leave a Reply

Your email address will not be published. Required fields are marked *


Your Cart is Empty

Back To Shop