Re: [Discuss-gnuradio] Benchmark_tx/rx with audio input and output

[Eric Blossom]

On Mon, Aug 24, 2009 at 11:29:10AM -0700, udadidd wrote:
> 
> Hi 
> 
> I wanted to do the benchmark tx and rx with Audio instead of the USRP.
> I made all the changes to the transmitter and the receiver. The transmitter
> works fine but the receiver hangs!!
> 
> I do the upconversion on transmitter after modulating, and transmit. and do
> the downconversion on receiver side before demodulating.
> 
> Upconversion : I multiply by a sine wave
> Downconversion : I multiply by both sine and cos, (which make I and Q) and
> use a float_to_complex to make them into one complex stream.
> 
> I set the converter rate = sample rate = 18000
> frequency = 250 Hz
> interp_deci_rate = 200
> Bit rate comes to 45 when samples_per_symbol = 2
> 
> I guess the hanging is at the delete_head() stage of the pkt.py! That just
> means the packets received are not in proper format! Wr can i possibly be
> going wrong? I am stuck here and any suggestion will be of great help!
> 
> Thank u

When we're debugging new code, we generally log the intermediate
results to files using gr.file_sink, then look at the resulting data
using some combination of octave, maplotlib, and/or scipy.

Eric