Re: [Discuss-gnuradio] tx_ofdm and rx_ofdm

[xianda]

Hi Martin:
               Thank you so much for your help.It can run.Thanks.
Best regards
xianda
At 2014-05-26 20:40:08,"Martin Braun" <address@hidden> wrote:
>On 26.05.2014 13:03, xianda wrote:
>> Hi:
>>      Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The
>> version of my gnuradio is 3.7.4).
>>     1.But in the receive part I receive two many things like this:
>> INFO: Detected an invalid packet at item 139632
>> INFO: Parser returned #f
>
>Xianda,
>
>this questions pops up a lot on this list, and 99% of the time it means 
>your RF settings are distorting your signal. Try reducing gain and 
>multiplier, and make sure you get a nice spectrum before you try and 
>receive (i.e. check it with uhd_fft and make sure it's rectangular).
>
>> UHD Warning:
>>      The hardware does not support the requested TX sample rate:
>>      Target sample rate: 0.100000 MSps
>>      Actual sample rate: 0.195312 MSps
>> And the device I use is USRP N210.And I set the sample rate is  100k.
>> Some days ago,someone tell me set the sample rate 100M/even number.And
>> the 100k seems right,why this UHD warning?Can someone tell me what is
>> the appropriate sample rate for USRP N210?Thank you very much.
>
>If you want 100K, you need to resample on the host. A stock N210 can go 
>down to 100e6/512 (i.e. what you're seeing). But that's OK, resampling 
>from 200k to 100k is not too CPU-intensive if you have a decent hardware.
>
>M
>
>
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