- #1
Fiona Rozario
- 52
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Why not work with the complete signal, instead of breaking it into in-phase and quadrature components?
Why do we need in-phase & quadrature components of a signal?
- Context: Undergrad
- Thread starter Fiona Rozario
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- Components Signal
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Discussion Overview
The discussion revolves around the necessity of using in-phase and quadrature components of a signal, exploring the reasons for breaking down signals rather than working with them in their complete form. The scope includes theoretical considerations and practical applications in signal processing.
Discussion Character
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- Some participants suggest that breaking a signal into in-phase and quadrature components allows for working with a lower frequency version of the signal, such as demodulated to baseband or to an intermediate frequency.
- Others argue that it is possible to deal with the signal as a variation of voltage with time, noting that some processes may be easier in the frequency domain using complex numbers, though this depends on the familiarity of the user with these concepts.
- A participant mentions that quadrature components are orthogonal to each other, allowing them to be treated separately and independently, which can facilitate the recovery of multiple AM signals transmitted together on quadrature carriers, provided the quadrature relationship is maintained throughout the process.
Areas of Agreement / Disagreement
Participants express differing views on whether it is necessary to break signals into in-phase and quadrature components, with some supporting the practice for specific applications while others advocate for working with the complete signal. The discussion remains unresolved regarding the necessity and advantages of each approach.
Contextual Notes
Some limitations include the dependence on the user's familiarity with frequency domain processes and the potential complexity involved in understanding these concepts in both time and frequency domains.
- #2
Dale
Mentor
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Usually that is done because you want to work with a lower frequency version of the signal. Either demodulated to baseband or to some Intermediate frequency.
- #3
sophiecentaur
Science Advisor
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It is quite possible to deal with the signal as it comes - a variation of Voltage with time. Some processes are just easier to accomplish in the frequency domain and using complex numbers. When I say "easier", that assumes that your a familiar with that stuff. If you aren't then those processes could be pretty hard to comprehend in either time or frequency domains. It gets difficult pretty rapidly. 
I guess a simple answer is that quadrature components of a signal; are orthogonal to each other and the components can be treated separately and independently. You could, for example, get two AM signals transmitted together on quadrature carriers and then recover them separately. But you would need to keep the quadrature relationship going throughout the process.
I guess a simple answer is that quadrature components of a signal; are orthogonal to each other and the components can be treated separately and independently. You could, for example, get two AM signals transmitted together on quadrature carriers and then recover them separately. But you would need to keep the quadrature relationship going throughout the process.
- #4
Fiona Rozario
- 52
- 1
Thank you...DaleSpam said:
- #5
Fiona Rozario
- 52
- 1
Thank you...sophiecentaur said:It is quite possible to deal with the signal as it comes - a variation of Voltage with time. Some processes are just easier to accomplish in the frequency domain and using complex numbers. When I say "easier", that assumes that your a familiar with that stuff. If you aren't then those processes could be pretty hard to comprehend in either time or frequency domains. It gets difficult pretty rapidly.
I guess a simple answer is that quadrature components of a signal; are orthogonal to each other and the components can be treated separately and independently. You could, for example, get two AM signals transmitted together on quadrature carriers and then recover them separately. But you would need to keep the quadrature relationship going throughout the process.
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