[Discuss-gnuradio] Benchmark scripts sending erroneous packets

[Daniel Ali]

Hello all, I've got a GNURadio install on two laptops, both of which have version 3.3.0 on them. They are both Dell Latitudes E5500 with Ubuntu 9.10 x86 on them. I have two USRP2s with the correct firmware installed on the SD cards to operate the WBX daughter card (txrx_wbx_raw_eth_20100608.bin). I have been trying to run the out-of-the-box benchmark_tx/rx.py scripts to just get correct packet transfer between the two. At first I found that having the radios too close together was causing the issue but even after moving them apart it still has an unacceptable BER. I followed the install instructions as follows:

1. Install dependencies in the blip of code given for the "sudo apt-get ..." command for Ubuntu 9.10.

2. Download gnuradio-3.3.0, unpack.

3. cd; ./configure; make; sudo make install; sudo ldconfig;

On a another note using a separate computer, a Sony Vaio with GNURadio 3.3.0 installed on Ubuntu 10.04 x86_64 seems to transmit to either of the Dell laptops just fine using the benchmark scripts with no errors at all.

The output on the receive is as follows (Ctrl+c'ed because nothing else was transmitting):

~/Desktop/gnuradio-3.2.2/gnuradio-examples/python/digital: sudo ./benchmark_rx.py -f 910M

>>> gr_fir_fff: using SSE

Requested RX Bitrate: 100k

Actual Bitrate: 100k

ok = False  pktno =    0  n_rcvd =    1  n_right =    0

ok = False  pktno =   85  n_rcvd =    2  n_right =    0

ok = False  pktno =  173  n_rcvd =    3  n_right =    0

ok = False  pktno = 6617  n_rcvd =    4  n_right =    0

ok = False  pktno =  320  n_rcvd =    5  n_right =    0

ok = False  pktno =  401  n_rcvd =    6  n_right =    0

ok = False  pktno =  548  n_rcvd =    7  n_right =    0

ok = False  pktno =  703  n_rcvd =    8  n_right =    0

^C~/Desktop/gnuradio-3.2.2/gnuradio-examples/python/digital: 

The output on the transmit (which seems to runs all at once instead of dot by dot as the Vaio does) is as follows:

~/Desktop/gnuradio-3.2.2/gnuradio-examples/python/digital: sudo ./benchmark_tx.py -f 910M

>>> gr_fir_fff: using SSE

Requested TX Bitrate: 100k Actual Bitrate: 100k

...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Does anyone have any suggestions, comments, etc,? Thanks.

--
Daniel Ali
Graduate Student
Electrical and Computer Engineering
Virginia Tech