Hi Julian, That's a lot of info. Thank you so much. Yeah, I have realized that flow graph is not sufficient. I am going through the first approach that you mentioned. Thanks a lot again.
On Fri, Jan 6, 2017 at 4:18 AM, Julian Arnold <jul...@elitecoding.org> wrote: > Hi Mallesham, > > I meant that with your B210 you can only capture up to 56 MHz of real > time bandwidth (in theory). > > By whole WiFi band, I mean from 2.401G to 2.473G, > However, you require over 70MHz at once. I didn't realize that you still > want to use the sweeping approach. > In that case, the flow graph I suggested is not sufficient. > > You might want to take a look at [1] which is the block > usrp_spectrum_sense.py is using internally and modify it to your needs. > I guess you could just remove the FFT and Complex to Mag Square block > from usrp_spectrum_sense.py > (change self.connect(self.u, s2v, ffter, c2mag, stats) to > self.connect(self.u, s2v, stats)) and make sure > that [1] accepts a vector of complex float as input and stores it to a > file instead of sending a message to the top block. > > Or you take a look at [2]. > The USRP Source can be controlled via a message interface. Therefore, > you could create a block that writes N samples to a file and then sends > a tune command > back to the USRP Source. > > If you need more help, let me know. > > [1] > http://gnuradio.org/doc/doxygen/classgr_1_1blocks_1_ > 1bin__statistics__f.html > [2] http://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax > > Cheers, > Julian > > On 01/04/2017 10:42 PM, Mallesham Dasari wrote: > > Hi Julian, > > > > Thank you so much again. I am able to collect the raw IQ samples using > > USRP source and File sink with gnuradio-companion. But, I am confused > > why you said that I will run into additional problems. > > > > On Wed, Jan 4, 2017 at 12:22 PM, Mallesham Dasari > > <mdas...@cs.stonybrook.edu <mailto:mdas...@cs.stonybrook.edu>> wrote: > > > > Hi Julian, > > > > Thank you so much for the response. By whole WiFi band, I mean > > from 2.401G to 2.473G, which is complete WiFi band. Is it possible > > to sweep entire band by using the approach you mentioned? I > > thought using gnuradio-companion, we can scan only one or few > > channels depending on the sample rate. > > > > Regarding Hardware: I am using USRP B210 with a sample rate of 8Msps. > > > > On Wed, Jan 4, 2017 at 4:00 AM, Julian Arnold > > <jul...@elitecoding.org <mailto:jul...@elitecoding.org>> wrote: > > > > Hi Mallesham, > > > > the easiest way would probably be to create your own simple > > flowgraph > > using GRC like so: > > > > |---------------------| |-----------------| > > | USRP Source | ----------> | File Sink | > > |---------------------| |-----------------| > > > > However, remember that writing to a file can be slow. You > > might want to > > consider using a ramdisk. > > Also, what whole Wifi band are you talking about? Depending on > > your > > hardware configuration you might run into additional problems. > > > > Cheers, > > Julian > > > > On 01/03/2017 09:04 PM, Mallesham Dasari wrote: > > > Hello, > > > > > > I am writing the raw IQ samples (m.raw_data) from > > > usrp_spectrum_sense.py to a file. I would like to bypass the > FFT > > > overhead, which I will do later. I want to scan the whole > > wide band of > > > wifi as fast as possible. Can anyone throw some light on how > > to take > > > only raw samples without FFT? > > > > > > -- > > > Best Regards, > > > *Mallesham Dasari* > > > Department of Computer Science > > > Stony Brook University > > > USA - 11794 > > > > > > > > > _______________________________________________ > > > Discuss-gnuradio mailing list > > > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> > > > > > > > > > > > > -- > > Best Regards, > > *Mallesham Dasari* > > Department of Computer Science > > Stony Brook University > > USA - 11794 > > > > > > > > > > -- > > Best Regards, > > *Mallesham Dasari* > > Department of Computer Science > > Stony Brook University > > USA - 11794 > > > -- Best Regards, *Mallesham Dasari* Department of Computer Science Stony Brook University USA - 11794
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