In WLANs, retransmission exerts a negative impact on throughput and delay. If the difference between the received signal and the background noise is too small, the data is damaged and needs to be transmitted again. The background noise of a channel is determined by the noise factor, temperature, and channel width of the RF component used in the radio. Background noise is also referred to noise floor. The SNR is essentially not a ratio, but a decibel difference between the received signal and the background noise. Similar to the SNR, a larger SINR indicates better signals. Interference, such as co-channel interference and multipath interference, is caused by the system and other systems. The difference between SNR and SINR is that SINR takes the impact of interference into account and is the ratio of signals to interference and noise. SNR, as well as SINR, is used to measure communication reliability. The SNR is calculated using the following formula: Therefore, the two persons must attempt to overwhelm the surrounding noise for better communication. The SNR indicates the impact of surrounding noise on communication content. When two persons try to communicate with each other, the communication content is signals, and the voices of other people around them are noise. Imagine a large room in which people are crowded. The difference between distortion and noise is that distortion is regular while noise is irregular. In addition, distortion and noise are actually related. Distortion is also an extra signal that does not exist in the original signals generated by a device. Noise signals are related to the environment and do not change as the original signals change. Noise refers to irregular extra signals that do not exist in original signals generated by a device. A signal is an electronic signal that comes from outside a device and needs to be processed by the device. Decibel can be defined as a unit that expresses relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels. SNR refers to the ratio of signal power to noise power in a system, often expressed in decibels (dB). This document describes the SNR in the wireless communication sector. In this case, it is easier for the search engine to obtain pages. A higher web page SNR indicates more plain text content on the page. Therefore, the web page SNR can be understood as the ratio of the text content on a web page to the generated HTML tag content when the text is produced. The content can be considered as undistorted sound signals, and the HTML tag content generated at the same time can be considered as noise. When a search engine obtains pages, it mainly obtains the text content after HTML tags are removed. This concept also exists in web page optimization. Web page SNR: It is a concept originated in the electroacoustic field, and refers to the ratio of the maximum undistorted sound signal strength generated by the sound source to the noise strength generated at the same time. A low SNR may result in static noise in the image. The image SNR refers to the ratio of the video signal strength to the noise signal strength. Image SNR: Similar to the image definition, the image SNR is an important indicator for measuring the image quality. At a low SNR, when small signals are input, the noise is severe and greatly affects the voice quality. The SNR is also referred to as a normalized SNR or an energy SNR, which is a common indicator.Īudio SNR: The audio SNR refers to the ratio of the normal sound signal strength to the noise signal strength when a sound device is playing. In a digital communications system, the SNR typically refers to the ratio of the average signal energy of each digital waveform (bit) to the noise power in a unit frequency band at the output end of a digital demodulator or decoder of a terminal set. In an analog communications system, the SNR typically refers to the ratio of the average signal power to the average noise power at the output end of the demodulator of a communications terminal. It applies not only to the communications sector but also to other sectors.Ĭommunication SNR: In modulation signal transmission, the SNR typically refers to the ratio of the average power of carrier signals at the output end of a channel (that is, the input end of a receiver) to the average noise power on the channel, and can be referred to as a carrier-to-noise ratio (CNR). The signal-to-noise ratio (SNR) is a main technical indicator for measuring communication reliability.
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