I mean drift, slight shift in the both the input and output receive
waveforms.
best regards,
srinivas.
srinivas naga vutukuri wrote:
Hi,
I am transmitting the sinusoidal wave form (IQ samples), in the
following methods, and found that when i stem plot in the MATLAB both
the input wave form data on one USRP2 and the received data on another
USRP2, initially the waveform is exactly fitting (i mean overlapping),
and after certain samples, it starts ie., in the input wave form and
the output data waveform drifting slightly and at the end samples both
the waveforms overlaps perfectly. Why this slight drifting is
happening when transmitting the I Q samples from one USRP2 to another
USRP2.
1st method:
I used, tx_samples.cc and receive_streaming_samples.cc.
2nd method:
Using the GRC, created a signal source, and file sink and usrp2 sink
on One PC and another PC usrp2 source and file source. So plotting
both the input stored samples and output received samples, observed
the above mentioned drift of mismatch of samples of the waveform and
again at the end and start it perfectly matches or overlaps.
Kindly help me in understanding this phenomena, why this is happening
on raw data (IQ) samples sending. But this never happens, when i
checked with the benchmark_rx.py and benchmark_tx.py used (as
internally these two are using GMSK modulation, sync work and packets
framing method).
best regards,
srinivas.
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