Spectrum

Waveform – Block used in order to capture a temporal signal waveform and perform FFT with association of a frequency scale.

Figure: Diagram block


The input pins 1 :

  • [1] : Input port for temporal waveform.
Figure: Dialog box


  • Probe name : the name which appears in output results window.

  • Result Display : format of the data. In order to perform the demodulation the schemma and modulation type must be filled here. User can choose between :

    • Real and Imaginary.
    • Magnitude and Phase
    • dB20 and Phase - When signal X is defined in sqrt(mW) : P = 20*log10(X).
    • dBm (Voltage wave) - When signal X is defined in Volts : P = 10*log10(X^2/(2*Z0)) +30
    • dBm (A power wave) - When signal is defined in sqrt(Watts) : P = 10*log10(X^2)) +30
  • Phase unit : degree or Radian
  • Label : one label can be defined.

    Example of result for 4 modulated carriers multiplexed :



    One can note that the frequency scale is obtained in base-band.