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Re: [Discuss-gnuradio] How to implement 64QAM?
From: |
alanluo |
Subject: |
Re: [Discuss-gnuradio] How to implement 64QAM? |
Date: |
Sun, 31 Jan 2010 21:52:06 -0800 (PST) |
Any response?
alanluo wrote:
>
> Hi, everyone:
>
> recently I have a project which need to use higher modulation scheme, such
> as 16QAM or 64 QAM. I noticed that in python/gnuradio/blksimpl, there is
> no demodualtion part for higher modulation schemes. Does that mean we need
> to finish it by ourself?
> And i also noticed that from the maillist attached as below, Tom seems
> working on the modualtion models. Did he finish this work, and post at
> some place i just did not find ?
>
> I really appreciate any help from you guys. Since I am very new to the
> python language and dont have confidence to programme the model in such
> short time.
>
> ====
> RE: constellation mapping
>
> by trondeau Mar 06, 2007; 05:44am :: Rate this Message: - Use ratings
> to moderate (?)
>
> Reply | Reply to Author | Print | View Threaded | Show Only this Message
>> -----Original Message-----
>> From: address@hidden [mailto:discuss-
>>
>> On Sun, Mar 04, 2007 at 06:20:07PM -0500, address@hidden wrote:
>>
>> > I want to do constellation mapping in pyhton. I have code that does
>> > a gr.packed_to_unpacked_bb and then gr.chunks_to_symbols_bc using a
>> > constellation of:
>> >
>> > constellation=array((1+1j,1-1j,-1-1j,-1+1j),Complex)
>>
>> Use this:
>>
>> constellation=(1+1j,1-1j,-1-1j,-1+1j)
>>
>> > My understanding is that this is the constellation mapping for QPSK.
>> > I want to do constellation mapping for BPSK and 64-QAM. I don't
>> > have a lot of GNU radio experience so I'm not really sure how to do
>> > this. Is all I do is change the array (all the possibilities from
>> > 4+4j to -4-4j for 64-QAM and 1+0j to -1+0j for BPSK) and the code
>> > will do the rest to map the data for the other modulation schemes?
>>
>> Have you looked at the mpsk code that's in the tree? Most of this
>> stuff is already in place. I believe that Tom Rondeau is working on
>> QAM too.
> ... [show rest of quote]
>
> Yep, you can already look in python/gnuradio/blksimpl for DBPSK and DQPSK.
> I'm finishing up the tests on the new stuff now and hopefully will get
> those
> checked in to the trunk by the end of today.
>
> This will include D8PSK and a number of square QAM modulations up to
> M=256.
> These are currently disabled until the receivers are finished, but the
> code
> will be there to see how I'm doing it. The modulators have been verified
> using our signal analyzer.
>
> Tom
> ====
>
>
> Best wishes,
>
> Alan
>
--
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- Re: [Discuss-gnuradio] How to implement 64QAM?,
alanluo <=