[Discuss-gnuradio] multiply signal with unit impulse

2017-02-12 Thread Sagnik Basu
How can we perform a multiplication of signal with unit impulse function in gnu radio ? I have attached the image of the operation I require . Regards, Sagnik Basu B. Tech | 2013-2017 Dept. of Electronics and Communication NIT Rourkela M: 8337942928 image1 Description: Binary data _

[Discuss-gnuradio] parameters for poly-phase clock sync

2017-02-12 Thread Charles Brain
Hi, I am trying to use the the poly-phase clock sync. At high S/N levels it works very well but at low S/N (<20dB S/N) it's performance is very bad. Which probably means I have made a mistake somewhere. The parameters I am passing to the module to generate the mother filter are firdes.root_rais

[Discuss-gnuradio] Changing the modulation based on a stream tag

2017-02-12 Thread Damindra Bandara
Hi, I have a flow graph where I try to change the modulation based on a stream tag. This is how I do it. 1- Based on a event add a 'modulation change tag' at the source block with the required modulation. 2-Inside the 'chunks_to_symbols_bc_impl.cc', I read the tag and change the symbol table bas

[Discuss-gnuradio] flow graph reconfiguration when using tagged streams

2017-02-12 Thread Damindra Bandara
Hi, I am trying to reconfigure a flow graph that uses tagged streams. When I lock() and unlock() the flow graph(or stop()--> wait() and start()) the blocks that uses tagged streams produce 'Missing length tag key' error. The problem does not appear if I reinitiate all the blocks that use tagged s

Re: [Discuss-gnuradio] flow graph reconfiguration when using tagged streams

2017-02-12 Thread Tim
Use async message blocks, whatever you are doing is probably a bad idea On 02/12/2017 04:29 PM, Damindra Bandara wrote: > Hi, > > I am trying to reconfigure a flow graph that uses tagged streams. When > I lock() and unlock() the flow graph(or stop()--> wait() and start()) > the blocks that uses ta

Re: [Discuss-gnuradio] multiply signal with unit impulse

2017-02-12 Thread Cinaed Simson
On 02/12/2017 06:37 AM, Sagnik Basu wrote: > How can we perform a multiplication of signal with unit impulse > function in gnu radio ? The integral of the impulse function times your function integrated from -infinity to +infinity is the function evaluated at t=0 in the limit where the width of t