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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Design Examples >
Nexxim RF Design Examples >
   Nexsys MPSK Example >
       Run All Analyses and View Reports           

Run All Analyses and View Reports

The main project MPSK_Nexxim_System is organized in three subprojects, MPSK_Baseband, MPSK_Mixed, and MPSK_SweptBER. All of these subprojects have the same Transient analysis setup:

This setup controls the Nexxim library elements. For the System elements, the discrete time domain analysis uses a fixed timestep controlled by the bit rate in the System source.

In addition, each subproject includes a few typical reports.

1. Click on the MPSK_Nexxim_System project and select Analyze All from the menu. The Progress window displays a red line to show each analysis as it runs. It may take a few moments for all analyses to run to completion.

2. Expand the Results icon under the MPSK_Baseband project. The four reports, Envelope, Spectrum, Constellation, and Eye Diagram show the output from the Baseband transmitter (system probe out) in different ways. Double click on each of the four reports to open it.

Here is the Envelope report.

The System simulator discrete time analysis automatically performs envelope analysis on an I/Q modulated signal. This graph shows the output from the Baseband transmitter [SP(out)] resolved into its In-band (re) and Quadrature-band (im) components.

Here is the Spectrum report.

This graph shows the output from the Baseband transmitter [SP(out)] analyzed in the spectral domain. The energy is centered around 1GHz, the upshifted signal frequency.

Here is the Constellation report.

This graph shows the Quadrature-band (im) component of the output from the Baseband transmitter [SP(out)] graphed against the In-band (re) component.

The four nodes about the points (+/-700, +/-700) correspond to the four symbols in the transmission. The distinctness of the constellation indicates a good signal.

Here is the Eye Diagram report.

The Eye diagram report confirms the quality of the Baseband transmitter output. The green diamond indicates the portion of the unit interval (UI) that must be open to guarantee the desired bit error rate (BER).

3. Expand the Results icon under the MPSK_Mixed project. The three reports, Center Frequencies, Signal Noise, and Noisy Channel show the output from the RF transmitter (system probe channel) plus the noise contribution from the channel (system probe noisy). Double click on each of the three reports to open it.

Here is the Center Frequencies report.

This graph compares the upshifted spectral output from the Baseband transmitter [SP(out)] at around 1GHz with the combined spectrum of the signal and carrier coming from the RF transmitter [SP(channel)] at around 10GHz.

Here is the Signal Noise report.

This graph shows the combined signal and noise output from the channel [SP(noisy)] analyzed in the time domain.

Here is the Noisy Channel report.

This graph shows the superimposition of the signal [SP(channel) and the Gaussian white noise added by the channel [SP(noisy)].

4. Expand the Results icon under the MPSK_SweptBER project. The single report, Bit Error Rate, shows the BER calculated by comparing the initial bit stream with the end result.

Here is the Bit Error Rate report.

This data table shows that no bit errors were detected.

These examples are just a few of the many possible reports. In addition, you can vary or sweep any of the netlist parameters to investigate the effects.

For additional information, see Nexsys Discrete Time Domain Analysis.

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