Quote:sandman: pancho_hideboo, Perhaps my use of generalisations was ambiguous, so I'll try to clarify it again for everyone's benefit, assuming, like you no one else here understood my questions.
Like I wrote and to explain further, I'm trying to design a multi-mode transmitter (to be extended to multi-band later) which is capable of simultaneously transmitting GSM/WCDMA/LTE signals, using the same RF components - MCPA, VGA, IQ-Modulator etc.
For this I need to be able to generate signals in a software simulation environment, in order to study certain aspects of the combined signal waveform, in time and frequency domain - this, so that I can understand what the requirements of my multi-mode transmitter should be - peak power (via CCDF), spurii etc.
With some level of generality, this could either be done in Agilent (Ptolemy or SystemVue) and Matlab/Simulink, or possibly using hardware equipment such as a signal generator (ex. from R&S SMU200A) and vector analyzers. But how are the signals combined best? Does a single Sig.Gen. exist which generates all internally and provides a multi-mode signal at the RF port of the Generator or does one have to use seperate Sig.Gen.s and combine them using a combiner and some filtering?
Since the above signal types have symbols which have different properties in time domain, some amount of attention needs to be given how a signal that is a combination of GSM/WCDMA/LTE waveforms are sampled, and therefore equal attention needs to be given to interpolation (i.e. DSP filtering)
Learn measurements using actual instruments. Not "EDA Tool Play". Quote:sandman: Not sure I understand why and how this highlighted stmt. is relevant here.
sandman wrote on Nov 5th, 2009, 2:03am:If it is not possible to simulate it together,
I'd like to be able to
What do you mean by "
I'd like to be able to" ?
Quote:sandman: Again, not sure how this can not be understoof, even if vaguely.
sandman wrote on Nov 5th, 2009, 2:03am:generate them seperately and then add them together,
You mean that you want to combine three mode signals with different carriers by power combiner and three DUT ?
Quote:I'm not sure how these signals are combined best, in the harwdare domain which is why I asked this question to the forum.
I can understand "the same RF".
However what do you mean by "
Baseband" ?
You mean DAC and programmable Digital Filter ?
Or only DAC with other all signal processing by DSP ?
Quote: sandman: By RF I mean, the same RF components which support convergent, simultaneous multi-mode transmission. I'm not comfortable yet with baseband terminology, so yes, if you mean DAC+DSP, then I think that would probably agree with that.
I can't understand your questions.
But I think it is possible using any of Agilent Ptolemy, Agilent SystemVue, Mathworks Simulink, CoWare SPD(SPW), etc.
I recommend you to use Agilent SystemVue not Agilent Ptolemy.
Currently main stream of ESL(Electronic System Level) design tool of Agilent is SystemVue not Ptolemy.
I can't expect any progress of Ptolemy any more.
Quote:sandman: Thanks! I was considering Ptolemy because I have a multi-carrier WCDMA simulation setup in Agilent Ptolemy to measure CCDF (i.e. design schematic, which will later include other measurements like ACLR etc.), but was not sure how to add GSM/EDGE and LTE carriers to this schematic, i.e. what factors to pay attention to, when combining multi-mode carriers.
sandman wrote on Nov 5th, 2009, 2:03am:If not, why and if yes, how -
what kind of sampling rates will I have to use,
what kind of filtering will I need to use etc. ?
Your sentences are too poor and your questions are too vague.
Your schematic includes only behavioral model ?
What do you mean by "
filtering" ?
Where is location of "
filtering" in Transmitter signal path ?
The followings are general notes.
- Use correct terminologies.
- Warnigns are different from Errors.
- ADS is not name of simulator.
- There is no tool which name is Cadence.
- All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.
- MATLAB are different from Simulink.
- Learn measurements using actual instruments. Not "EDA Tool Play
Quote:sandman: Like everyone else who's learning from this open forum, I appreciate experienced members who share insightful remarks for the benefit of everyone, not disconnected rants possibly a carry over from other posts and interactions. Nevertheless, I greatly appreciate your and everyone else's technical comments. I would be happy to clarify my question further if it is challenging to understand...
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Multi-carrier simulation (Read 5755 times)