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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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