Hi,
I am developing an application which changes between the QPSK and BPSK modulations based on the signal level. My transmitter path is set as follows.
File source --> Packet Encoder --> Constellation modulator --.> USRP sink.
Initially, the constellation of the 'Constellation modulator' is set to a QPSK Constellation Rect. Object. To change the modulation to BPSK I change the Constellation Rect. Object to BPSK.
Everything works fine for the change from QPSK to BPSK. But when I try to change back to QPSK from BPSK I get the following error.
sched: <block pfb_arb_resampler_ccf (12)> is requesting more input data
than we can provide.
ninput_items_required = 13525
max_possible_items_available = 8191
If this is a filter, consider reducing the number of taps.
I appreciate if you could help me to solve this problem.
Thank you
Damindra
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Damindra Savithri Bandara,
Ph.D. in Information Technology (Candidate)
George Mason University,
Fairfax,
Virginia