Re: [Discuss-gnuradio] Error when switching between QPSK and BPSK modulations

[Marcus Müller]

We'll have to see the minimal flowgraph that makes this behaviour reproducible in order to understand what's going wrong here.

Best regards,
Marcus

On 06/20/2016 10:38 PM, Damindra Bandara wrote:

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

--

Damindra Savithri Bandara,

Ph.D. in Information Technology (Candidate)
George Mason University,
Fairfax,
Virginia

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