|Subject:||Re: [Discuss-gnuradio] How to extract stable fine frequency offset based on the benchmark program?|
|Date:||Thu, 19 May 2016 12:41:11 +0200|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0|
I'm not sure what's going on here, but I think it could be likely that your estimate of the preamble-autocorrelation simply doesn't work all too well.
Generally: ditch benchmark_rx and the blocks it uses. They are really superseeded by the OFDM blocks that were introduced in 2013 – they are far better, and also, will simply give you the estimates you want, I think.
Make sure you have a recent version of GNU Radio, and look for the rx_ofdm.grc example (likely somewhere in /usr/share/gnuradio/examples/digital/ofdm). The "Schmidl & Cox OFDM synch." block actually has an output "freq_offset", and the "OFDM Channel Estimation" block adds a stream tag containing the full subcarrier offset (if any).
Other than that:
I've been trying to figure out the frequency offset of USRP recently.Could you specify this a bit more?
On 19.05.2016 05:53, DingJing wrote:
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