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Re: [Discuss-gnuradio] qam constellation problem


From: Brook Lin
Subject: Re: [Discuss-gnuradio] qam constellation problem
Date: Mon, 16 May 2011 13:36:51 -0700 (PDT)

BTW, I also got more fuzzy 16 points save by chunks2symbols.dat before the
filter. Could anyone help me explain it? 
Thanks,
Brook


Brook Lin wrote:
> 
> Hi All,
> 
> I am plotting the constellation plot for qam8 before and after the root
> raised cosine filter. Why I didn't get clear 8 dots constellation before
> the root raised cosine filter (plotted from the data saved by
> chunks2symbols.dat)? For both constellation before (data saved by
> chunks2symbols.dat) and after (data saved by rrc_filter.dat) the filter, I
> got 8 fuzzy dots. Can anyone tell me why is that? However, for dbpsk, I
> got clear two points before the filter, but fuzzy two points after the
> filter. 
> 
> Thanks in advance,
> Brook
> 
>  http://old.nabble.com/file/p31632653/qam8_before_filter.png 
>  http://old.nabble.com/file/p31632653/qam8_after_filter.png 
> 
> 
> 

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