ofdm video

[nolsqn]

i am trying to transmit video using ofdm ....but problem is that i am not able to get vedio and then converting it to bits to perform rest of the operation ..i have used ivison toolkit  1.8 but it always giv error proxy filter not registered error.....i need help!!!!!!!!!!!!!!!!!!!!

[Wiebe@CARYA]

Have you asked the people at ivision? They should know.

Regards,

Wiebe.

[Paul_C.]

Hi nolsqn,

Can you tell us a little more about your application?  Are you using any National Instruments hardware?  Are you using the modulation toolkit for the ofdm transmission?  Did you get any error code with the error?  This type of information would be very beneficial when trying to troubleshoot the error your referring to.  The ivision toolkit is make by a third party and it might also be beneficial to contact them regarding errors if they are specific to their vi's.

Regards,
Paul C.

[nolsqn]

uptil now i hav done ofdm using an image ........only on software ...no hardware .........but the problem is that i cannot convert audio or video in bitstream ...... meaning that i dun no how to convert them.......for converting audio or video into bitstream i didnt get any error as i dont know where to start ....i tried the  simple read.vi to aquire a .wav file  bit its output is an array of wavforms ...now how to convert an array of wave forms in to bits...........for video i dun even have a clue where to start....and i m new to labview...

[Jim_M]

Hi,

      Are you using the IVision toolkit to try to accomplish your goal here?  If so, it may be best to try to contact them.  If you are not using the IVision toolkit currently, can you explain on a high level what you are trying to do by converting your wav file to a bitstream and then what you want to do with it next and which hardware/communication you are trying to use ultimately.  It will make it easier for us to assist you if we can understand what your ultimate goal is.  Good luck and have a great day.

[nolsqn]

well my ultimate goal is to simulate a video streaming ofdm ...  i first used an image .....and now i am trying to use an .wav file to simulate ofdm  but the problem is that i cant get it to convert  to bitstream....and how might i be able to contact the ivision people

[Jim_M]

Hi nolsqn,

         There are many sound examples available in the LabVIEW help that I recommend you take a look at to get an idea for what you may be trying to do.  You can find them by navigating through the menu system Help >> Find Examples... Once you open the NI Example Finder, browse for the following path Hardware Input and Output >> Sound.  There are many examples here that may help you understand how to properly use National Instruments' sound functions.  Also, if you are interested in contacting the company that develops IVision, you can find  their contact information here.  Have a great day.

[RVLV]

Hi, I've made an OFDM baseband transmitter and receiver myself. Presently using a PN sequence generator as the source. I wanted to know how you used an image file as the source.  Can you please throw some light on it? It would be best if you could send me the VI as I need it to show some of my students. Cheers, RVLV

[jschwartz]

Hello RVLV,

Are you using any National Instruments hardware, either as instruments or to communicate with your instruments?  How is your data getting into the computer?  Do you want to know about transmitting and receiving data or the image processing? In LabVIEW, are you using the Modulation Toolkit?

[RVLV]

Hello, I'm using LV 2009 along with Modulation and spectral Measurement toolkits. Presently I don't have any hardware. But will be acquiring the PXIe chassis with the IFRIO cards for proving wireless transmission. I have achieved the image conversion into bitstream and further OFDM modulation. I'm just able to make one OFDM symbol at a time. I have not achieved any control on how to choose the number of carriers, cyclic prefix or the bandwidth. I used a 128 bit PN sequence earlier. So I guess I was doing a 128 Point IFFT to get my time domain OFDM waveform.

But if its a long bitstream like a converted JPG, how do you go about it?

RVLV

P.S. Really appreciate the prompt response.