What is a channel in cellular systems

[bos1234]

If a channel is 5Khz for a full duplex system in cellular systems does that mean person A and person B are using the whole 5Khz to communicate?

Or can the channel accommodate a lot of people?

 

[berkeman]

If a channel is 5Khz for a full duplex system in cellular systems does that mean person A and person B are using the whole 5Khz to communicate?

Or can the channel accommodate a lot of people?

The 5kHz slot would be for one connection. Each person-to-person connection would need its own slot.

There are modulation schemes where this is not totally true -- schemes where the comm "channels" are spread over a wider bandwidth, and interleaved in various ways.

Here is a reasonable introduction to modulation:

http://en.wikipedia.org/wiki/Modulation

.

 

[bos1234]

thanks for reply, but I am having tough time understanding this

I read that
each call requires a channel. But in the question below I have 19 channels but 120 users. Isn't that ineffecient as there will be a lot of calls being blocked.
Would not the probability of a call being blocked be too high??