Howtosignalprocessing
- Why carrier frequency is higher than modulating frequency?
- What is meant by carrier frequency offset?
- How do you shift a signal in the frequency domain?
- What is frequency shifting?
Why carrier frequency is higher than modulating frequency?
To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency). this is when the carrier frequency is higher , and we noticed that bandwidth is just twice of the highest frequency of modulating signal.
What is meant by carrier frequency offset?
Carrier frequency offset often occurs when the local oscillator signal for down-conversion in the receiver does not synchronize with the carrier signal contained in the received signal.
How do you shift a signal in the frequency domain?
Multiplying a function with a complex exponential with period t0=1/f0, corresponds to shifting the frequency domain by 1/t0=f0.
What is frequency shifting?
This phenomenon is known as “frequency shifting”, where the term “up- conversion” refers to the process of shifting a lower frequency tone to the upper frequency range (used in RF transmitters), while “down-conversion” refers to the frequency shifting from higher to lower frequency ranges (used in RF receivers).
