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Re: [Discuss-gnuradio] [QPSK modulation and demodulation using PSK mod a

From: Martin Braun
Subject: Re: [Discuss-gnuradio] [QPSK modulation and demodulation using PSK mod and demod blocks]
Date: Tue, 7 Feb 2017 17:29:16 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 02/07/2017 01:55 PM, Minh Pham wrote:
> Dear Martin Braun,
> Thank you very much for such quick response, I really appreciate that. I
> wish to clarify several things:
>  - By "Differential modulation", do you mean that in my case, I should use
> Differential Quadrature Phase Shift Keying (DQPSK)?


>  - For the more sophisticated option, can you give me a hint where to start?

Well, you need to figure out what your actual phase is. So, you need a
preamble, and then need something else to pick one of the four
rotations. And then you need to feed that into the demod.

-- M
> Sincerely,
> Minh.
> --
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> http://gnuradio.4.n7.nabble.com/QPSK-modulation-and-demodulation-using-PSK-mod-and-demod-blocks-tp62774p62782.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
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