Re: [Discuss-gnuradio] How to implement 64QAM?

[alanluo]

Thanks Isaac for your kindly suggestion. I think i have to dive into python
now...



idg101 wrote:
> 
> Hi,
>   I haven't looked at any of the QAM-related code in the GNU Radio
> baseline, but it should be possible to design a generic MQAM demodulator.  
> 
> In fact, you should be able to build a generic MQAM demodulator for a
> given constellation set.  This, I've done before in Matlab.  You start
> with an AGC, feed through an equalizer which is optimized for minimizing
> the phase error between recovered and truth symbols.  Another way to look
> at it that for each symbol, find the symbol that matches closest to the
> constellation vector (thats your decode symbol) and then feed the error
> into the equalizer.  
> 
> I believe there is a way to form a generic carrier recovery and symbol
> recovery loops that can deal with generic MPSK style constellation of
> which MQAM is a part of.  In fact, you could write a routine that can do
> anything from BPSK to 64QAM.
> 
> my 2 cents,
> Isaac
> 
> 
> 

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