|Subject:||Re: [Discuss-gnuradio] Using Correlate Estimation with hardware|
|Date:||Mon, 28 Aug 2017 11:11:17 -0400|
i run into trouble using the correlate estimation block.
As far as i understand this blocks is used to search for a praeamble which is modulated and filtered with match filter.
To achieve this i used modulate vector. I used this block like it`s done in the corr_est exapmles provided in /gnuradio/gr-digital/
Using no UHD but a channel modell everything works fine having clear correlation peak.
Using it with hardware device it doesn`t work anymore, having more peaks avaiable.
My flowgraph is very simple:
Vector_source (using prae+data as vector tagged with tx_sob and tx_eob) -> constellation Modulator(default-QPSK-object) -> stream mux with null_source for break -> uhd sink(sync = PC_clock)
Uhd source (sync = PC_clock) -> low_pass -> corr_est(modulated_vector, 0.9) -> Pll-clock-sync -> Costas Loop -> constellation-demodulator -> float_to_char -> qt time sink
Modulate vector is called with default-qpsk-object as constellation object and  as filter taps which i think is right.
The praeamble i am using is the one provided in the examples, so it should be ok too.
I dont have that much experience in this topic so I hope somebody is able to help me.
I am looking forward to hearing from you and thank you in advance.
PS : I am not sure where and how to provide the flowgraph itself but i´ll try to do it asap.
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