The more devices on the same channel, the weaker the strength of the WiFi signal. Therefore, in order to make the quality of the WiFi at home high enough, it is necessary to change the WiFi at home to use the same channel as the surrounding WiFi.
For example, if you use 1 channel at home and everyone around you uses channel 2, there is no problem, but if more and more people around you use 1 channel, the WiFi signal will be affected, which will eventually affect your home network.
Capacity and bandwidth of the channel
The channel capacity reflects the maximum information that can be transmitted by the channel. Channel capacity can be expressed as the number of bits that can be transmitted in a unit time (called the data transmission rate and bit rate of the channel), expressed in the form of bits per second (b/s), abbreviated as bps.
Channel bandwidth is defined as the lower limit frequency and the upper limit frequency of signals allowed to pass through the channel, which can be understood as frequency passband. For example, the allowable passband of a channel is 1.5kHz to 15kHz, and its bandwidth is13.5kHz..