What are the communication terms of the channel and the characteristics of the transmission channel

The number of channels can be divided into wired channels and wireless channels.

Wired channels: such as twisted pairs, cables, optical fibers, waveguide rounding, etc.;

Wireless channel: the electromagnetic wave propagation channel of the first segment or wavelength of various frequencies provided by free space.

The basic concept of communication is divided into two parts, broad and narrow.

In the sense of Guangfanling, communication refers to the accurate and safe transmission of information from one party to the other by any method and medium by two or more parties who need information without going against their own will.

In a narrow sense, communication is the transmission and exchange of information, that is, the transmission of information.

The complete definition should be: communication, refers to the exchange and transmission of information between people or between people and people through a certain behavior or medium, and in a broad sense, it refers to the accurate and safe transmission of information from one party to another party by any method and medium by two or more parties who need information without going against their own will.

Channel: The medium through which the signal is transmitted.

Channel: The medium through which the signal is transmitted.

Channel is a visual metaphor for the path between the sender and the receiver in wireless communication, for radio waves, it is transmitted from the sender to the receiver, there is no tangible connection between it, and its propagation path may be more than one, but in order to vividly describe the work between the sender and the receiver, we imagine that there is an invisible road connection between the two, and this connection path is called a channel.

Due to the mobility of mobile stations in mobile communications, there is also a Doppler effect in the wireless channel, as mentioned earlier. In mobile communications, the frequency becomes higher when the mobile station moves to the base station and lower when it moves away from the base station. We should fully consider the "Doppler effect" in mobile communications.

Although it is unlikely that a very large frequency shift will be brought about due to the limitation of our moving speed in daily life, it will undeniably have an impact on mobile communications, and in order to avoid this impact causing problems in our communications, we have to consider various technologies. It also increases the complexity of mobile communications.

To sum up, wireless channels include multipath propagation, delay spread, fading characteristics and Doppler effect of radio waves, and we need to fully consider these characteristics and solutions in mobile communication.

A channel refers to the channel through which information is transmitted. Including ().

a.The empty nucleus collides with the difficult talk of transmission.

b.Time Transfer.

c.Forward transmission to the Tung tree.

d.Reverse transmission.

Correct answer: ab

Summary. 4. Noise: Noise refers to undesirable interfering signals in the channel. Noise can come from the channel itself or from the external environment. Noise can degrade the quality and reliability of the signal.

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Pro, the characteristics of the transmission channel are the characteristics that the signal exhibits when it is transmitted in the channel. The following are several common transmission channel characteristics: 1. Bandwidth:

Bandwidth refers to the range of frequencies that a channel is capable of transmitting, i.e., the difference between the highest and lowest frequencies of the signal transmitted by the channel. The larger the bandwidth, the higher the transmission capacity of the Letters.

2. Delay: Delay refers to the time it takes for a signal to be transmitted in the Sidesong channel. It includes propagation delay (the time it takes for a signal to propagate from the transmitter to the receiver) and processing delay (the time it takes for the signal to be processed during the transmission process).

3. Fading: Fading refers to a random change in signal strength in a channel. It can be caused by multipath propagation, channel shadowing, and clever effects.

Fading imitation noise can be fast fading (e.g., rapid changes due to multipath propagation) or slow standby fading (e.g., slow changes due to channel shading effects).

4. Noise: Noise refers to the undesirable residual interference signal in the channel. Noise can come from the channel itself or from the external environment. Noise can degrade the quality and reliability of the signal.

5. Distortion: Distortion refers to the change of shape, amplitude or phase of the signal during transmission. Distortion can be caused by factors such as the frequency response of the wide dust channel, nonlinear characteristics, and clock skew.

6. Capacity: Capacity refers to the maximum transmission rate that the channel can achieve. It depends on factors such as the bandwidth of the channel, the noise level, and the signal power.

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These characteristics are important for understanding the performance and limitations of the channel. When designing and optimizing communication systems, it is necessary to consider these characteristics and select the appropriate signal modulation, coding, and demodulation techniques to adapt to different channel characteristics.