When transmitting data signals in a channel with random thermal noise, the relationship between data transmission rate Rmax and channel bandwidth b and signal-to-noise ratio S/N is: Rmax = b * logχ( 1+S/N).
In the related fields of signal processing and information theory, a famous formula-shannon theory is obtained by studying how the signal attenuates after a certain distance and how much data can be loaded in a given signal. It gives the upper limit of link speed in the form of bits per second (bps), which is expressed as a function of link signal-to-noise ratio, and the link signal-to-noise ratio is in decibels (dB). So we can use Shannon theory to detect the data rate of telephone lines.
Shannon theory is given by the following formula: c = blog2 (1+S/N), where c is the available link speed, b is the bandwidth of the link, s is the average signal power, and n is the average noise power. Signal-to-noise ratio (S/N) is usually expressed in decibels (dB), and the number of decibels = 10× log65438+.
Specifically, you can check the teaching materials of computer network engineering in universities:>
Channel ratio-refers to the ratio of the signal power of the channel to the power of Gaussian noise in the channel, usually expressed as 10log 10S/N, and the unit is decibel.
The formula is C=Hlog2( 1+S/N).
This is the formula for calculating the channel capacity, and the signal-to-noise ratio is the degree of interference during network transmission. It is also related to transmission rate, and the signal-to-noise ratio will affect the transmission rate.
The maximum rate can be calculated as follows:
C=2Hlog2N
C is the maximum rate.
H is the bandwidth (Hz)
N is the number of modulation batteries.
Channel capacity-refers to the maximum data transmission rate that the channel can bear. The unit is b/s. The channel capacity is limited by the channel bandwidth. The wider the channel bandwidth, the more information will be transmitted on the channel in a certain period of time.
Bandwidth-refers to the bandwidth of the physical channel, which is the difference between the highest frequency and the lowest frequency promised by the channel!
Having said so much, you should understand something, right?
If you don't understand, join an exchange group and ask the master! Hmm. How interesting