You are welcome
Am 13. Juni 2020 21:54:01 MESZ schrieb Khalilur Rahman <[email protected]>: >Hello, >sorry for the late reply. >Thank you. It was unfortunate that I haven't checked the schematic >diagram >Of Red Pitaya. >It is now clear that analog signal from PC goes to Red pitayas ADC then >CPU. >Have a nice weekend. > >Thanks again for your help. > >Best regards >Khalil > > >On Sat, 13 Jun 2020 at 12:46, Fabian Schwartau <[email protected]> >wrote: > >> Hi, >> take a look at the second page of the schematic of the Red Pitaya: >> >> >http://downloads.redpitaya.com/doc/Red_Pitaya_Schematics_STEM_125-10_V1.0.pdf >> It has an ADC and a DAC. The signal going into the ADC will show up >in >> the source block in GNU Radio, while the signal going into the sink >> block in GNU Radio will come out of the DAC. Simple as that. >> Best regards, >> Fabian >> >> Am 13.06.20 um 12:40 schrieb Khalilur Rahman: >> > Hello Fabian, >> > I hope you are doing great! >> > '' from Gnu Radio in PC digital modulation is done, the generated >signal >> > sink through Red Pitaya(FPGA). We are only concerned about >processing >> > the baseband signal by Gnu radio with Red Pitaya. From GitHub we >found >> > one SDR project. The 'sink' for red pitaya is also available on >that >> > project, so we don't need to make one. Now we are confused as the >analog >> > signal sink to Red pitaya how does it processing it? I mean the >signal >> > as an input to red pitayas CPU should be digital. '' >> > Thank you >> > >> > Best regard >> > Khalil >> > >> > >> > On Sat, 13 Jun 2020 at 11:29, Fabian Schwartau <[email protected] >> > <mailto:[email protected]>> wrote: >> > >> > Hey Khalil, >> > >> > first of all: every signal is digital within the computer. What >you >> > probably mean is what this signal represents. The output of a >> modulator >> > usually represents an anlog signal. It is of type float (or >complex >> > float) and each sample represents for example a voltage. I >don't >> > understand what you are supposed to do with that signal after >that. >> When >> > you say you need to "sink this signal though an embedded >processor" >> you >> > mean an external physical device? If that is the case you need >some >> sort >> > of sink in GNU Radio, like an audio sink, which will convert >you >> digital >> > signal into an analog audio signal (DAC). >> > If you want to process the signal further, e.g. by filtering >it, you >> can >> > do that in GNU Radio. >> > Hope that helps, >> > Fabian >> > >> > Am 13.06.20 um 10:40 schrieb Khalilur Rahman: >> > > Hello Guys, >> > > I was studying the digital modulation in regards to GNU >Radio. I >> have >> > > one confusion which I really need to get over with. >> > > >> > > Let say, I am using BPSK modulation for processing >low-frequency >> > > baseband I- signal. After the digital modulation, the output >> I-signal >> > > is digital or analog type? Yes, as baseband signal it is >> > > obviously analog. I mean the output type of constellation >> > modulator. If >> > > I put a time sink it will show as an analog signal but my >study >> > partner >> > > said it is digital. Same with QPSK or QAM. I know this is >very >> basics >> > > but I did not find any answer. >> > > We need to generate baseband from GNU Radio and sink this >signal >> > through >> > > an embedded processor for further signal processing. If the >> > > constellation modulator gives an analog signal then we have >to >> first >> > > convert signal through ADC. We are very much new on GNU >Radio. >> > > >> > > Thank you in advance. >> > > >> > > Best regards >> > > Khalil >> > >> > >> >> >>
