PM, QPSK, QAM, OFDM software simulations and examples

[Serina]

Hi everyone,

                   I am trying to find examples on Phase Modulation and other modulation examples (but currently PM modulation is the 1st priority) but i look for the tutorial in NI website they only provide Amplitude and Frequency Modulations Examples on software simulation. Anybody knows where to find or even has this modulation example can you please tell me because i really need it for my project. Thanks!

[altenbach]

Are you using the modulation toolkit or are you trying to make your own in plain LabVIEW?

(here are the examples for the toolkit: http://zone.ni.com/devzone/cda/tut/p/id/6722)

Message Edited by altenbach on 04-21-2008 07:02 PM

[Serina]

Hi,

    actually i just trying to use examples in NI for my project as a VI exercise  to let understand the concept of each modulation. Because in NI tutorial website, there are simple software simulation exercises to let people download and know the concept of each modulation. I am trying to use these examples in my project to let people understand more in the modulation. Please see the exercise i have uploaded you will understand more. I have downloaded AM, FM, ASK, FSK and PSK but i still need others. Now, i trying to finish the catergory for analog modulation, AM, FM and PM. So i finding PM modulation now, the url u have written i seen it before but i think i cant find what i want. that's y i am also asking if anyone happen to have it or create it by yourself, would you mind 'sharing' it with me by uploading the files if you happen to have it. 🙂

[ajayramk@google.com]

 Hello friends

I am new to LabVIEW and I am trying to learn the basics of the RF modulation toolkit .I tried simulating QAM baseband modulator and demodulator on LabVIEW. Initially I did not use any impairments in the system. I could establish the communication link properly. But I always lose out on certain bits from the input bit stream at the recovered output.  For eg,  I tried sending 10 bits through the system . However I recieved only 6 bits at the output. These recovered bits correspond to the first six bits of the input stream.  I also tried out one of the QAM examples to see what is wrong in  my system. However, in this case too, I lose out on certain bits from the input bit stream. I tried digging into the modulkator block. 

Essentially what I assume is being done is the input bit stream is mapped into symbols depending upon the modulation scheme. After that we interpolate the symbols depending on the sampling scheme. I understand that there is padding for the first symbol. and so there will be double the no. of samples for the first symbol. However at the output of the pulse shaper I get 72 samples instead of 96 ( expected). There are 8 samples of the first symbol and 16 samples of the remaining symbols. This is my first doubt.

At the matched filter, the output of the fractional resampler returns only 52 samples. I also do no understand why this happens

  It would be really nice if someone could help me with this

Cheers

Ajay

[ajayramk@google.com]

oh I am sorry . I forgot to attach my file