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
INFO: Detected an invalid packet at item 139680
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139728
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139776
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139824
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139872
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139920
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139968
INFO: Parser returned #f
INFO: Detected an invalid packet at item 140016
INFO: Parser returned #f
INFO: Detected an invalid packet at item 140064
And I search the maillist and I find someone encounter the same problem like me.(http://lists.gnu.org/archive/html/discuss-gnuradio/2013-11/msg00082.html)And I see"As long as the receive SNR is high enough, the problem does not show up."And I try to increase the "Multiply Const" to increase the snr.But it failed.And I try to increase the receive gain.And also failed.Can someone help me?Thank you very much.
2.And in the transmit part:
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.
Any advices will be appreciated.Thank you.
Best regards
xianda