Symbol

Symbol in digital communication

Symbol in digital communication
  1. What is a symbol in digital communication?
  2. What is a symbol in digital modulation?
  3. What is the difference between bit and symbol?
  4. What is the difference between signal and symbol?

What is a symbol in digital communication?

A symbol may be described as either a pulse in digital baseband transmission or a tone in passband transmission using modems. A symbol is a waveform, a state or a significant condition of the communication channel that persists, for a fixed period of time.

What is a symbol in digital modulation?

In digital modulation, the Symbol Rate determines the rate (frequency) at which symbols occur. A symbol may consist of one or more bits as determined by the modulation format. For example, in a BPSK. system, each symbol represents 1 bit; in a QPSKQuadrature phase shift keying system, each symbol represents 2 bits.

What is the difference between bit and symbol?

Symbol is used to map more than one bits and are used to transmit bits over channel after baseband and carrier modulation. Bit rate referred as number of bits transmitted per second. Symbol rate referred as number of symbols transmitted per second. It is also known by "Baud rate".

What is the difference between signal and symbol?

A signal is a sequence of symbols transmitted sequentially over time. A symbol is any distinct state of the communication channel. For example, in a binary (two-state) channel, the states could be two voltage levels, two different values of current, or even two different frequencies — i.e., a simple modem.

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