Re: [Discuss-gnuradio] DVB-T TX - ImportError: No module named _osmosdr_swig

2018-02-17 Thread Maximilian Stiefel
.com/search?suite=default§ion=all&arch=any&keywords=Swig&searchon=sourcenames Best regards, Maximilian Stiefel Lördag den 17 februari 2018 skrev Andreas Weller: > Hi. > I'm trying to follow the instructions > onhttp://www.irrational.net/2014/03/02/digital-atv/ > &

Re: [Discuss-gnuradio] Floating point FFT usage - suppress half of it?

2018-03-18 Thread Maximilian Stiefel
Hi Brad, Hi Marcus, @ Brad: The basic properties of the Fourier transform give you this symmetry. In general the Fourier transform has the following property, usually refered to as conjungation: F{ x*(t) } = X*(-jw). For purely real input signals, this boils down to Xr(jw) = Xr(-jw) (even)

Re: [Discuss-gnuradio] Floating point FFT usage - suppress half of it?

2018-03-18 Thread Maximilian Stiefel
Hi Brad, > Taking a step back, maybe the mirroring is a product of the method I'm > using to interpret the output of the FFT. I really do not think so, because, as explained below and in the previous mail, the phenomenon, we witness here, results from the physics behind signal theory. As I

Re: [Discuss-gnuradio] problem in LTE uplink sync word

2018-04-03 Thread Maximilian Stiefel
Hej Prabhat, >From a python point of view the sync word has to be a tuple e.g. (1, 1j, 1, >1j). What you have is a list. That's why this exception is raised. Regards, Max Tisdag den 3 april 2018 skrev Prabhat Kumar Rai: > Hi, > I have been working on LTE UPLINK in GNURADIO with help of *OF

[Discuss-gnuradio] Block to Load Taps From File

2018-04-21 Thread Maximilian Stiefel
Hello everybody, it is as far as I know not that convenient to import taps from a filter design file to a design in grc. On stackoverflow it was mentioned, that there is apparently a workarround using numpy.fromfile('filename'): https://stackoverflow.com/questions/36744843/passing-taps-to-t

Re: [Discuss-gnuradio] Frequency hopping code printing UUUUU

2018-04-27 Thread Maximilian Stiefel
Hello Laura, It is definitely not afternoon here in Sweden. There is no flowgraph attached. Happens to me as well, every time ;) This output usually indicates you are doing are something, that causes samples to be dropped, i.e. not transmitted, because something is not fast enough. What sample

[Discuss-gnuradio] Upsampling: Delay and Alignment

2018-07-10 Thread Maximilian Stiefel
Hello everbody, upsampling a complex data stream gives me headaches :( In my flowgraph the upsampling is done by multiplexing 7 zeros with 1 data sample and feeding this into a FIR filter, which is how everybody does it as I understood. However, for further processing I have to take the delay