flat fading channel的意思|示意

Flat fading channels refer to radio channels in which the signal attenuation over the distance between the two transmit and receive antennas is the same regardless of the type of frequency of the transmitted signal. This is different from frequency-selective fading channels, where the signal attenuation depends on the frequency of the transmitted signal.

Flat fading channels are most commonly used in wireless communication systems because they are simpler to model and analyse. To illustrate, in a flat fading channel, the signal is transmitted from a source to a receiver through a single path. This means that the signal attenuation is the same over the whole distance between the antennas, regardless of the frequency of the transmitted signal. As a result, the received signal can be modelled as a simple attenuation factor, which can be easily calculated.

On the other hand, in a frequency-selective fading channel, the signal attenuation is not constant over the whole distance. Instead, the signal attenuates differently depending on the frequency of the transmitted signal. This means that the received signal must be modelled as a complex set of attenuation factors, which makes the analysis of the signal much more difficult.

In addition, flat fading channels are ideal for wireless systems where the signal must be transmitted over a short distance, such as in a cell phone network. This is because the simple attenuation model makes it easier for the system to compensate for the signal loss over the distance.

In conclusion, flat fading channels are the most commonly used in wireless communication systems due to their simple modelling and analysis. They are ideal for applications where the signal must be transmitted over a short distance, such as in a cell phone network.