Howtosignalprocessing
- How is phase noise measured using the spectrum?
- What is spread spectrum in CDMA?
- How is phase noise calculated?
- What is phase noise analysis?
How is phase noise measured using the spectrum?
Although there are many ways of measuring phase noise, the most straightforward is to use a spectrum analyzer. Essentially the analyzer is connected to the output of the unit under test via any suitable attenuator needed to reduce the power into the analyzer (if the output power from the unit under test is high).
What is spread spectrum in CDMA?
Spread spectrum is a form of wireless communications in which the frequency of the transmitted signal is deliberately varied resulting higher bandwidth. Spread-spectrum is apparent in the Shannon and Hartley channel-capacity theorem − C = B × log2 (1 + S/N)
How is phase noise calculated?
Phase noise measurements quantify the short term stability of a frequency source. That is because phase and frequency are mathematically related by a differential function [ω(t) = dΦ(t)/dt] so they are directly connected.
What is phase noise analysis?
Phase noise is the most generic method of expressing frequency instability. The carrier frequency instability is expressed by deriving the average carrier frequency and then measuring the power at various offsets from the carrier frequency in a defined bandwidth.
