[Discuss-gnuradio] Schmidl & Cox Detector

[David Halls]

Hi guys,

 

Happy New Year to everyone.

 

We are using a flow graph based on the OFDM example in GR, including the Schmidl and Cox detector block. Having spread the USRPs out over our test environment we have increased the receiver gain significantly (to about 30dB). (N210 XCVR240 @ 1MS/s, 2.4GHz)

 

Anything above around 10dB Rx gain, we get a lot of false triggering on the S&C block. Presumably the heightened noise causes false peaks in the peak detector? The technique doesn’t have a fixed threshold does it? So is there a way we can avoid this issue? Not sure how to debug as it’s a hierarchical block so not sure how to effectively get intermediate debugging output.

 

Thanks!

 

David

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