Re: [Discuss-gnuradio] 2xB210 boards via USB 3.0 (UHD C++)

Hello Martin, Thanks for your reply. I made this yesterday (as you said, 2 different usrp object's, 2 different streamer object's etc.). Finnaly got 4 separated channels, using two separated boards. As we are talking about synchronization im planning to follow UHD API hint: - external 10 MHz r

[Discuss-gnuradio] 2xB210 boards via USB 3.0 (UHD C++)

Greetings, Any one trying to connect two of those boards to collect samples from 4 channels simultaneously? One of ettus examples says that: Specify --args to select multiple motherboards in a configuration.\n" " Ex: --args=\"addr0=192.168.10.2, addr1=192.168.10.3\"\n" but what should i pick in

Re: [Discuss-gnuradio] 802.11 Beacon frame transmitter - mobile devices

So, following your idea, after waiting a larger period of time, passive scanning should "catch" my beacon right? (becouse when entering new area, or getting in range of unknown AP, there are no information to send direct probe request by mobile device). I think that mobile device is performing so

Re: [Discuss-gnuradio] 802.11 Beacon frame transmitter - mobile devices

I think yes. Rest of 802.11 beacon in my area also have CRC (while in monitor mode - Windows Network Monitor). -- View this message in context: http://gnuradio.4.n7.nabble.com/802-11-Beacon-frame-transmitter-mobile-devices-tp51215p51217.html Sent from the GnuRadio mailing list archive at Nabble

[Discuss-gnuradio] 802.11 Beacon frame transmitter - mobile devices

Greetings After creating beacon frames transmitter based on usrp i decided to check its performance. Im sending a beacon frames and correctly decoding it by my wlan card (in monitor mode - screen attached). Any ideas why i cant find this

Re: [Discuss-gnuradio] Gettin data out from GRC to C++ or java?

Thanks for those tips. Matlab can handle 20M samples due to receiver object, which is buffering data, and than sending it to Matlab. My receiver is able to demodulate around 5x802.11 frames per second but i want something more faster. So i can use UHD driver in C++ enviroment directly right? Sorr

Re: [Discuss-gnuradio] Gettin data out from GRC to C++ or java?

So i if would like to create a simple flow graph, with USRP source and file sink only, is there any way to control file buffer size (i.e i want that any file consist of 3k 32complex samples every write)? Any 3.7 compatibile pipe pack? tried gr-pipe but typical "gnuradio-core" error :( -- View t

Re: [Discuss-gnuradio] Gettin data out from GRC to C++ or java?

So i can just constantly write data to file (with file sink) and open it in a loop in any C++ enviroment right? -- View this message in context: http://gnuradio.4.n7.nabble.com/Gettin-data-out-from-GRC-to-C-or-java-tp50824p50826.html Sent from the GnuRadio mailing list archive at Nabble.com. _

[Discuss-gnuradio] Gettin data out from GRC to C++ or java?

Greeting, After building up some strong Matlab's prototype of my 802.11 receiver, I have to make really big and complicated GUI with lot of button's, plots, different tabs etc. And my question is simple: Any way to output complex data collected by USRP from grc to any other enviroment (c++ or j

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Ok. All working fine :D -- View this message in context: http://gnuradio.4.n7.nabble.com/GRC-3-6-802-11-a-g-test-signal-tp50585p50731.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@g

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Greetings, finnaly got it working :D Problem was with descrambler. Now it gives results as follows: Service: 'ok' Duration: '' Source_MAC_Adress: '232323232323' Destination_MAC_Adress: '' Protocol_ver

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Ok fixed. Now giving correct results :) Ill try with your frame once more and hit you up later. Thanks for your amazing feedback Bastian. Best, Ernest -- View this message in context: http://gnuradio.4.n7.nabble.com/GRC-3-6-802-11-a-g-test-signal-tp50585p50690.html Sent from the GnuRadio m

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

So... After going deep into Annex L i found that my scrambler fails. Also MATLAB built-in scrambler gives wrong results. Could you pls check this code fragment? Asumme that we have 20 data bits to scramble. Initial scrambler state is [1 0 1 1 1 0 1] (bit nr 7 left side). scrambler_register=[1 0 1

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Got the pilot sequence but ill check it once more. I also got Annex L so not neccesary to post it but thanks. Ill check everything once more, according to L. -- View this message in context: http://gnuradio.4.n7.nabble.com/GRC-3-6-802-11-a-g-test-signal-tp50585p50678.html Sent from the GnuRadio

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Ok. After couple of days trying to decode your frame i decided to check my receiver with real samples. Could it be possible that after demodulation (de-interleaving, de-convolutional, de-scrambling) im getting over 40x0's in correct positions (9 reserved bits, 16x0s in duration, correct pads) and s

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Nope, Any way to get it? Is it downloadable? Should be helpfull indeed. -- View this message in context: http://gnuradio.4.n7.nabble.com/GRC-3-6-802-11-a-g-test-signal-tp50585p50661.html Sent from the GnuRadio mailing list archive at Nabble.com. _

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Ok, so i decoded all of the payload (123 data symbols, de-interleaving every one in receiver's loop). After Viterbi and descrambling it gives some strange results: 7 of SERVICE bits are random - OK (i read in standard that those 7 bits are 0's at the transmitter, and will set receivers descrambler

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Hi, much appreciate for your reply Bastian. I have succefully found your frame.bin signal, forwarded by my USRP (generated in MATLAB, received with Windows Network Monitor and wlan card). You were right. It is Data frame, 232323:232323 Source MAC and FF:FF Destination MAC. Still dunno

Re: [Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Greetings, Ok, got this. After some test's i think that the problem is with my descrambler (de-interleaver and Viterbi seems to be ok). Currently, im using Matlab's one provided by comm. toolbox. Is it correct to use 127-bit length pre-defined scrambling/descrambling seq? (i found it in 802.11 s

[Discuss-gnuradio] GRC 3.6 / 802.11 a/g test signal

Greetings engi's! I'm currently working on my masters (802.11 wlan receiver with MATLAB/USRPN210). After creating all the important stuff ie: -symbol finder -time synchronization -coarse and fine frequency compensation -symbol demodulator -deinterleaver -Viterbi decoder -descrambler etc. -MAC la