Significance of snr

SNR is imperative to distinguish various output signals to achieve efficient output. Signal-to-Noise Ratio is typically expressed in terms of decibels. The higher the SNR value, the better is the output. The reason is that there's more useful information (signal) than unwanted data (noise) in a high SNR output.

1. What is the significance of SNR during transmission?
2. Why is higher SNR better?
3. What is an acceptable SNR value?
4. What happens when SNR increases?

What is the significance of SNR during transmission?

A signal-to-noise ratio over 0 dB indicates that the signal level is greater than the noise level. The higher the ratio, the better the signal quality. For example, a Wi-Fi signal with S/N of 40 dB will deliver better network services than a signal with S/N of 20 dB.

Why is higher SNR better?

SNR directly impacts the performance of a wireless LAN connection. A higher SNR value means that the signal strength is stronger in relation to the noise levels, which allows higher data rates and fewer retransmissions – all of which offers better throughput.

What is an acceptable SNR value?

The range of SNR may vary between 1dB and 30dB. The optimum SNR range is 18–30dB. 18dB is the minimum value at which the device can still operate and deliver relatively optimum performance. Values lower than 18dB can drastically reduce the performance.

What happens when SNR increases?

When SNR increases, the channel's data throughput also increases. This means that for a given signal level, an increase in noise will decrease the data throughput. The higher the noise level, the less space there is for the actual data that is being transmitted on the channel.