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SOQPSK demod

SOQPSK demod

Hello

I am trying to implement SOQPSK demodulator.

I want to know is it possible to convert QPSK or OQPSK to SOQPSK

by using the one which is available in LabVIEW and how ??

 

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Re: SOQPSK demod

I haven't worked with OQPSK, but it seems to me the easiest way is to convert from regular QPSK. I'm working from the information here:

http://www.ni.com/tutorial/5487/en/

 

It seems to me you could use the modulation toolkit to do this.

 

  1. Start with a QPSK waveform
  2. Take IQ data from QPSK (after symbol mapping) and upsample by a factor of 2
  3. split complex array into I and Q
  4. Delay Q array by one sample

I'm not familiar with SOQPSK, but maybe you could derive that from the OQPSK IQ data?

 

Edit: Looks like modulation toolkit actually includes some OPQSK examples: MT Offset QPSK Equalization.vi, MT Offset QPSK Mod-Demod.vi, and MT Offset QPSK Transceiver.vi.

Dale S.
RF Systems Engineer - NI
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Re: SOQPSK demod

Hello Sir

 

Thanks for your earnest response.

Sir is there any third order Butterwoth filter or just half sine filter or a average matched filter readily available in the toolkit

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Re: SOQPSK demod

Try browsing the VIs in this palette.

Dale S.
RF Systems Engineer - NI
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