Hi all, why does the output of PSK Mod block is imperfect, compared to
theoritical QPSK constellation.( iam implementing qpsk with 4 sampl/sym
and
4 constellation points).The experiment im doing is the same in link ( http://gnuradio.squarespace.com/storage/tutorial/rondeau-costterra2.pdf).
On 06/10/2013 07:25 PM, vamshi krishna dodla wrote:
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Thanks & Regards
Vamshi Krishna.
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This kind of question is much better accompanied by the flow-graph
you’re working, perhaps an FFT and constellation plot, etc, etc.
You question, as presented, reduces to “why does thing thing I’m doing
not work”. Which nobody will be able to help you with.
On Mon, Jun 10, 2013 at 7:25 PM, vamshi krishna dodla [email protected] wrote:
Thanks & Regards
Vamshi Krishna.
Inter-symbol interference. Look up the root raised cosine filter and
you’ll see why. Basically, an RRC is /not/ a Nyquist filter. Now think
about what that means to the receiver.