Average power in Amplitude Modulation

Click For Summary

Discussion Overview

The discussion revolves around the concept of average power in amplitude modulation (AM), specifically focusing on the effects of single-sideband (SSB) operation on power and bandwidth. Participants explore how the removal of the carrier and one sideband influences the overall power transmitted and the implications for bandwidth availability.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant notes that removing one sideband in SSB operation reduces the overall transmitted power compared to the power present when both sidebands and the carrier are included.
  • Another participant questions how the removal of the carrier and one sideband limits the bandwidth of the signal, expressing confusion about this aspect.
  • A suggestion is made to explore "ordinary amplitude modulation" to understand the differences between standard AM and SSB, particularly regarding power distribution among the carrier and sidebands.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the relationship between power reduction and bandwidth limitations in SSB operation. There is no consensus on the specifics of how bandwidth is affected, as some participants seek further clarification.

Contextual Notes

Participants have not fully resolved the mathematical or conceptual details surrounding the trade-offs between power and bandwidth in amplitude modulation. There are indications of missing assumptions and definitions that could clarify the discussion.

onceinalifetim
Messages
38
Reaction score
0

Homework Statement



how the overall power becomes lesser when one side band is taken away by the bandpass filter and also how it limits the bandwidth of the signal

Homework Equations





The Attempt at a Solution



there is will be the trade off between power and bandwidth. Vdc and Vm are peak values of the carrier and modulating sine waves. the power in the carrier and sidebands can be calculated the power formula..
 
Physics news on Phys.org
In single-sideband operation (SSB) the carrier and one of the two sidebands are removed. Since power exists in the carrier and both sidebands, removing two out of the three signals reduces the transmitted power in relation to the power in the remaining sideband. And the absence of the carrier and the other sideband makes room for other SSB signals.
 
hi.. thanks for the reply..

may i know how does it effect the limits the bandwidth go the signal? i still very confuse about this point.
 
hi..

do you have any links that i can read?? thanks
 
onceinalifetim said:
hi.. thanks for the reply..

may i know how does it effect the limits the bandwidth go the signal? i still very confuse about this point.

As I said, removing the carrier and one of the sidebands makes bandwidth available for other signals.

I suggest a search on "amplitude modulation". You need to start with what's called "ordinary amplitude modulation" which is like what your AM radio uses. Then you can see how AM-SSB differs from ordinary AM, including power in the carrier and the sidebands.
 

Similar threads

  • · Replies 15 ·
Replies
15
Views
5K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
4K
Replies
5
Views
4K
Replies
20
Views
7K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
61
Views
16K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
12K
Replies
5
Views
2K