What is a channel in cellular systems

  • Thread starter Thread starter bos1234
  • Start date Start date
  • Tags Tags
    Channel Systems
AI Thread Summary
In cellular systems, a 5kHz channel typically accommodates one full duplex connection, meaning each person-to-person communication requires its own dedicated slot. While modulation schemes can allow for more efficient use of bandwidth, generally, each call needs a separate channel. The discussion highlights concerns about efficiency when there are significantly more users than available channels, as this can lead to a high probability of call blocking. Users express confusion about how multiple users can connect with limited channels, emphasizing the need for a better understanding of channel allocation. Overall, the efficiency of channel usage in cellular systems is a critical consideration for managing user connections.
bos1234
Messages
26
Reaction score
0
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?
 
Engineering news on Phys.org
bos1234 said:
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

.
 
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??

syy26w.png
 
Last edited:

Thread 'What happens if shielded cable has short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Question about bonding ground and neutral'

I am not an electrical engineering student, but a lowly apprentice electrician. I learn both on the job and also take classes for my apprenticeship. I recently wired my first transformer and I understand that the neutral and ground are bonded together in the transformer or in the service. What I don't understand is, if the neutral is a current carrying conductor, which is then bonded to the ground conductor, why does current only flow back to its source and not on the ground path...
View full post »

Similar threads

RF Tuner: Adjacent Channel Interference Rejection Filters
Replies
24
Views
4K
Cellular Spectrum Bandwidth: How Much Space is Needed for a Single Call?
Replies
15
Views
2K
What are the factors influencing Error Vector Magnitude (EVM)?
Replies
1
Views
2K
Dual Channel Network Acceleration on Android Phone
Replies
3
Views
2K
Two Channel Microphone: Right & Left Channels Explained
Replies
4
Views
2K
What is the Notation Used in Simulating an OFDM Channel?
Replies
1
Views
1K
How can I create frequency channels for a 4-channel FM communication system?
Replies
5
Views
2K
What type of battery pack can power a device with 9V 0.5A output?
2
Replies
79
Views
8K
Finally finished: Tube amp project
Replies
21
Views
3K
Radio Wave Induced Firing Of Neurons Through Ca2+ Channel Manipulation
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top