This presentation discusses two types of interference that can impede communication: external interference which comes from outside sources, and internal interference which comes from within. It then explains two basic channels of interference - co-channel interference which occurs when multiple cells use the same frequency, and adjacent channel interference which results from nearby frequencies leaking into the pass band and can be minimized through filtering and channel assignment.

1. Welcome to my presentation

3. •Anything that impedes the
communication of a message.
•Have two kinds of interference in
public speaking.
•External & Internal .
Interference
:

4. Basic Channel of Interference:
1.Co-channel
Interference

5. • Co-channel interference depends on:R:cell
radius
• D=distance to center of the nearest co-channel
cell
• If d/R then spatial separation relative to cell
coverage area
• Improved isolation from co-channel Rf energy
Co –channel:
When frequency reuse is implement ,several cells within a
given coverage area use the same set of frequencies. Two
cells using the same set frequency are called co-channel.

6. Co-Channel Figure:

7. Adjacent Channel:
1.Result from imperfect receiver filter
,allowing nearby frequencies to lack
into pass band.
2.Can be minimized be careful filtering
&channel assignments.
3.Channels are assigned such that
frequency separation between
channel are maximized .

8. Adjacent Channel