Baud rate vs Bit Rate

In the field of electronic communication,Baud Rate (Baudrate) that isModulation rateIndicates the unit time after the signal is modulated.PorterNumber, that is, the number of times the carrier parameter changes within the unit time. It is a measure of the symbolic transmission rate. Generally, the unit is "Porter per second" (BPS, 1 port transfers 1 Symbol per second (may contain multiple bits ). The rate of the analog line signal, also known as the modulation rate, measured by the number of vibrations per second of the waveform. The baud rate is the modulation rate of the carrier based on the signal. It is expressed by the number of times the carrier modulation status changes within a unit of time, and its unit is port (baud ). The relationship between the baud rate and the bit rate is: Bit Rate = the binary digits corresponding to the baud rate X individual modulation status.

The baud rate is sometimes mixed with the bit rate. In fact, the latter is a measure of the information transmission rate (transfer rate. The baud rate can be understood as the number of symbols transmitted per unit of time (symbol transfer rate). Different modulation methods can load multiple bit information on a single symbol. Therefore, the information transmission rate (bit rate) has the following relationship with the baud rate:

WhereIIs the mail transfer rate,SIs the baud rate,NThe amount of information loaded for each symbol, in bits. Therefore, only when each symbol represents only one bit information, such as the baseband binary signal, the baud rate and bit rate are equal in numerical values, but their meanings are different.

How to distinguish the two? Obviously, the bit rate of two-phase modulation (one modulation State corresponds to one binary bit) is equal to the baud rate; the bit rate of four-phase modulation (one modulation State corresponds to two binary digits) is twice the baud rate; the bit rate of the Eight-phase modulation (a single modulation State corresponds to three binary bits) is three times the baud rate, and so on.