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[Discuss-gnuradio] parameters for poly-phase clock sync
From: |
Charles Brain |
Subject: |
[Discuss-gnuradio] parameters for poly-phase clock sync |
Date: |
Sun, 12 Feb 2017 14:49:51 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 |
Hi,
I am trying to use the the poly-phase clock sync.
At high S/N levels it works very well but at low S/N (<20dB S/N)
it's performance is very bad. Which probably means I have made a
mistake somewhere.
The parameters I am passing to the module to generate the mother filter are
firdes.root_raised_cosine(10,samp_rate*n_filters,symbol_rate,0.35,31*n_filters)
where
samp_rate = 2000000
n_filters = 32 (number of filters in the filterbank)
symbol_rate = 1000000
0.35 is the filter's Beta
31 is the length of each filter in the filterbank
I have read the book the filter is derived from so I know what it is
trying to do
but obviously I have messed up somewhere.
Thanks
- Charles
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