Re: [Discuss-gnuradio] ofdm channel estimation

[Martin Braun]

On 07/15/2014 09:39 AM, xianda wrote:
> Hi Martin:
>                 Thank you for your kindly reply.
>                 Another question I want to ask.
>                 When I use the rx_ofdm,I add a UHD:USRP
> Source.(Environment: USRP N210)I know when the block Schmidl &Cox OFDM
> synch. detect the signal,the port "detect" will output 1.And I test it.I
> use the rx_ofdm when I don't use the tx_ofdm.It means that no signal
> exist.But I find 1 in the port "detect".Why?When no signal exist,it
> should output 0.Why I see 1 from it?

...bad luck? It's not impossible to generate false alarms. What did you
feed the block?

Martin



>                 Thank you so much.
> Best regards,
> xd
> 
> 
> 
> 
> At 2014-07-14 04:37:37, "Martin Braun" <address@hidden> wrote:
>>On 07/13/2014 01:06 PM, xianda wrote: >> Hi all: >> Have you ever using
> the >> gnuradio/gr-digital/examples/ofdm/rx_ofdm.grc?And I change the >>
> rx_ofdm.py as follows: >>
> self.connect((self.digital_ofdm_chanest_vcvc_0, 1), >>
> blocks.file_sink(gr.sizeof_gr_complex * fft_len,
> 'channel-estimate.dat')) >> And i use the matlab: > >Please read the
> fine manual:
>>http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1ofdm__chanest__vcvc.html#details.
>> >The channel estimate is on a tag. > >M >
>>_______________________________________________ >Discuss-gnuradio
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> 
>