Hi !

I am modeling a high frequency phased array in Ptomely.

However I have no idea how to model the antenna array.
Should I model the "antenna array+channel" in the matlab?
After that, I wonder if Ptomely will allow me put a matlab black box inside the system.

What is the interface between ADS and Matlab? I know matlab codes can give an output text for Ptomely to use for modulation purposes..


Or should I try option 2? Designing the whole system in Simulink using baseband envelope? then modeling the channel and integrating it in the system may be simply, but I can't replace the circuits in transceiver instead of using behavioral models.

pancho_hideboo! I know you have a big depth of knowledge. Would you be able to help me with this problem? I appreciate your help!

Wishing you all a nice weekend!
Mehmet

memomemomemo wrote on Aug 8^th, 2009, 6:45pm:
I recommend you to use MATLAB.

memomemomemo wrote on Aug 8^th, 2009, 6:45pm:
Yes, you can do.

memomemomemo wrote on Aug 8^th, 2009, 6:45pm:
Ability of importing of MATLAB functions are provided as standard menu in Agilent ADS.
http://edocs.soco.agilent.com/display/ads2009/MATLAB+Cosimulation+Introduction

memomemomemo wrote on Aug 8^th, 2009, 6:45pm:
MATLAB is different from Simulink.
Simulink is alternative solution for Agilent Ptolemy. But there is no alternative solution for MATLAB in Agilent ADS.

However I recommend you to use Simulink not Ptolemy since we can't expect any progress in Agilent Ptolemy any more.
Only one benefit of Ptolemy is it's ability of post processing, here you can use same usemodel for Analog/RF domain.
But Simulink is superior than Ptolemy regarding performance as simulator.

memomemomemo wrote on Aug 8^th, 2009, 6:45pm:
I can't understand what you mean.
There is no difference between Simulink simulation and Ptolemy simulation.
See http://www.designers-guide.org/Forum/YaBB.pl?num=1238242506/1#1

Create another thread.

memomemomemo wrote on Nov 3^rd, 2009, 11:31pm:
Basically there is no difference between Ptolemy and Simulink if you can understand concept of equivalent lowpass model for RF bandpass system very correctly.
See http://www.designers-guide.org/Forum/YaBB.pl?num=1245687123

Compared to Ptolemy, Simulink have "Frame-based sampling mode" in addition to "Sample-based sampling mode".
On the other hand, Ptolemy have only "Sample-based sampling mode".

memomemomemo wrote on Nov 3^rd, 2009, 11:31pm:
If your system is not bandpass system,
it is almost impossible to simulate since we can't use equivalent lowpass model or equivalent baseband model.
This is true for both Ptolemy and Simulink.

memomemomemo wrote on Nov 3^rd, 2009, 11:31pm:
I can't understand what you mean. Which do you mean "true baseband" or "equivalent baseband" ?

memomemomemo wrote on Nov 3^rd, 2009, 11:31pm:
Show me "signal attributes" of each node, e.g. signal type, sampling rate, etc. You can show them easily in Simulink.
See http://www.designers-guide.org/Forum/YaBB.pl?num=1233929450

memomemomemo wrote on Nov 3^rd, 2009, 11:31pm:
I can't understand what you mean.
Describe with correct terminologies.

Equivalent lowpass model is not used in the following.
See http://www.designers-guide.org/Forum/YaBB.pl?num=1245687123


You have to make clear followings.
 - True Baseband Signal
 - Representation of RF Bandpass Signal as Equivalent Baseband Signal
 - Representation of RF Bandpass Signal as True RF Bandpass Signal

About phase noise of RF Bandpass Signal, it is impossible to treat it as "Representation of RF Bandpass Signal as True RF Bandpass Signal".

It might be impossible to treat "s2p" file in "True RF Bandpass Signal" as far as you use the following "RF Blockset".
  RF Blockset>Physical>Input/Output Ports>Input Port
  RF Blockset>Physical>Input/Output Ports>Output Port
  RF Blockset>Physical>Black Box Elements>General Passive Network

Instead, create real coefficients FIR model to express S21 as true RF Bandpass model.

Ptolemy can treat "s2p" in both "Equivalent Baseband Signal" and "True RF Bandpass Signal" seamlessly.
Ptolemy calculate complex coefficietns FIR model for former case and real coefficients FIR model for latter case.

memomemomemo wrote on Nov 5^th, 2009, 10:27am:
I'm not kind and patient enough.

You had better expect that other people who is very kind and patient could help you.