[Discuss-gnuradio] qam constellation problem

[Brook Lin]

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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