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Communication 3
Communication 3

1. Classified by transmission medium

Wired communication: refers to the communication medium in the form of wires, cables, optical cables, waveguides, nanomaterials, etc., which is characterized by the fact that the medium can be seen and touched (bright line communication, cable communication, optical cable communication, fiber optic cable communication).

Wireless communication: A form of communication in which the transmission medium cannot be seen or touched (such as electromagnetic waves).

(microwave communication, shortwave communication, mobile communication, satellite communication, scatter communication).

2. Classified by signal transmitted in the channel

Analog signal: Any parameter of the signal (such as the amplitude, frequency, phase of the continuous wave, amplitude, width, position, etc. of the pulse wave) can take an infinite number of values and directly correspond to the message. The analog signal is sometimes called Continuous signal. This continuity means that a certain parameter of the signal can be continuously changed.

Digital signal: A parameter of a signal can only take a finite number of values, and often does not directly correspond to the message, also known as a discrete signal.

3. Classified by operating frequency band

Long wave communication.

China Mobile Communications.

Shortwave communication.

Microwave communication.

4. Classified by modulation

Baseband transmission: means that the signal is sent directly to the channel without being modulated.

Communication method.

Band transmission: means that the signal is modulated and then sent to the channel for transmission.

Communication method with corresponding demodulation measures.

5. Classified according to the division of labor and data transmission direction of both parties.

For point-to-point communication, according to the direction of message transmission, the communication mode can be divided into simplex communication, half-duplex communication and full-duplex communication.

The so-called simplex communication refers to a communication working mode in which messages can only be transmitted in one direction. There are many examples of simplex communication, such as broadcasting, remote control, and radio paging. Here, the signal (message) is transmitted only from the broadcast transmitting station, the remote controller, and the radio paging center to the radio, the remote control object, and the BP machine.

The so-called half-duplex communication method refers to the way in which both parties can send and receive messages, but not both at the same time. Intercoms, transceivers, etc. are all such communication methods.

The so-called full-duplex communication refers to the way in which both parties can simultaneously transmit messages in both directions. In this way, both parties can send and receive messages at the same time. It is obvious that the channel for full duplex communication must be a bidirectional channel. There are many examples of full-duplex communication in life, such as ordinary telephones, mobile phones, and so on.


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