Hi,
This last couple of months have been my first to get introduced to the GNU
radio. It has been a fun and frustrating learning experience so far. I and my
team member are using two USRP's to communicate to each other. We have been
able to send and receive data by just sending a cosine wave and or a bit stream
successfully. But the problem is that when we try to send a bit stream through
BPSK we are not receiving the data correctly. First of all we are using grc to
run the blocks with a carrier frequency of 2.5GHz with a bandwidth of 500KHz.
On the receiver side we are using AGC, a matchedou filter(rrc), pll, time
recovery and a slicer to finalize it. We are placing the FFT scope after the
matched filter to see if we are receiving any data and it seems like we are
because you can see the peaks changing as we change the frequency but our BER
is of 1/2 therefore our system its not working.
We first thought we should make the online dbpsk source code working prior to
us attempting anything but not even running the modulation and demodulation
dbpsk block works.
Any suggestions or creative ideas are encouraged please.
We think it may be the parameters we are setting each block to be although to
our knowledge we have calculated them all based on our carrier frequency and
bandwidth. We also attempted placing a bandpass filter after the antenna but it
will not permit us, it gave an error. The parameter used for that was of cutoff
of high frequency of 2.501e9 and cutoff of low frequency of 2.499e9 with a
transition bandpass of 500KHz or 1MHz.
I hope to hear from someone soon.
Thank you,
Student
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