[Discuss-gnuradio] gr-lte：can't decode MIB

[kevin_L]

Dear Johannes,I use the usrp source, and ran the "lte_top_block_siso",but it
just stucked. Should I impove my computer performance？ Or is there something
wrong with my flowgragh? Wait for your reply,thank you!
the two pictures following are my outputs.
 
 







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[Discuss-gnuradio] Use gnu-radio & usrp to make a wireless relay node

[Shilei Tian]

Dear all,

Recently, I'm working on a subject about wireless relay network energy 
efficiency, and I want to do do some experiments, so I need a wireless relay 
whose wireless signal power is adjustable. The client nodes are mobile devices, 
like Android phones, iPhones, and iPads.

My idea now is to use USRP(I own N210 now) and GNU Radio. The USRP implements 
the RF side of Wi-Fi, and GNU Radio implements all protocols, like MAC, NAT and 
DHCP Server, just make it a wireless router. But the work is so huge, so I'm 
afraid that I cannot make it. Besides, I've read the paper "An IEEE 802.11a/g/p 
OFDM Receiver for GNU Radio", but it could only work on the pure OFDM mode, 
which my clients don't support.

So I want to ask whether there are existing 3rd party GNU Radio modules that 
could do this job.

Wow, a new idea occurs to me, could the USRP only amplify the Wi-Fi signal of 
the selected base station? For example, I have a base station, whose SSID is 
"Base_Station", "my relay" (USRP + GNU Radio) receives the signal from the base 
station and amplify it. If the mobile devices connect to my "replay" want to 
send data, it sends to "my relay", my relay receive it and then send to the 
base station, transmission done. In this way, the assignments of IP address and 
NAT service are still finished by the base station. In this way, "my relay" 
don't need to implement protocols. Can this way work?

By the way, I want to ask, is there any relay that suits for me on the market?

--

Sincerely yours,

Shilei Tian（田世磊）
Postgraduate Student
Department of Computer Science and Engineering
Shanghai Jiao Tong University


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Re: [Discuss-gnuradio] gr-lte：can't decode MIB

[Johannes Demel]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hi Kevin,

I assume you use a N2x0. UHD tells you that the requested sample rate
is not supported and even exceeds the connection capacity.

Then the resampler does upampling by a large factor which will feed
the flowgraph with the wrong sample rate.

'samp_rate' specifies the rate the decoder flowgraph expects for your
configuration.

Hope those hints help.

Cheers
Johannes



On 13.12.2015 10:33, kevin_L wrote:
> Dear Johannes,I use the usrp source, and ran the
> "lte_top_block_siso",but it just stucked. Should I impove my
> computer performance？ Or is there something wrong with my
> flowgragh? Wait for your reply,thank you! the two pictures
> following are my outputs. 
>  
> 
> 
> 
> 
> 
> 
> 
> 
> -- View this message in context:
> http://gnuradio.4.n7.nabble.com/gr-lte-can-t-decode-MIB-tp57267.html
>
> 
Sent from the GnuRadio mailing list archive at Nabble.com.
> 
> ___ Discuss-gnuradio
> mailing list Discuss-gnuradio@gnu.org 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
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Re: [Discuss-gnuradio] Use gnu-radio & usrp to make a wireless relay node

[Marcus Müller]

Hello Shilei Tian,

I'm pretty sure that the cited gr-ieee-802-11 module is the most
developed IEEE802.11 (wifi) implementation for GNU Radio in existence.
> Wow, a new idea occurs to me, could the USRP only amplify the Wi-Fi signal of 
> the selected base station? For example, I have a base station, whose SSID is 
> "Base_Station", "my relay" (USRP + GNU Radio) receives the signal from the 
> base station and amplify it. If the mobile devices connect to my "replay" 
> want to send data, it sends to "my relay", my relay receive it and then send 
> to the base station, transmission done. In this way, the assignments of IP 
> address and NAT service are still finished by the base station. In this way, 
> "my relay" don't need to implement protocols. Can this way work?
Sadly, I don't think so. The USRP you have has only one RX and one TX
port, so you can only have one full-duplex operation: You can only
forward signal from your client to your Access Point, or from your
Access point to your client, but not simultaneously. You'd have to be
very clever to detect when to switch between forwarding in one and the
other direction. I think it might not even be possible at all --
802.11a/b/g/n, as far as I know, uses CSMA/CA as access scheme, which
means that there's no "fixed" time at which you can be sure only one
party uses the medium.

Also, most WiFi devices already have adjustable TX power. My home
router, for example, supports a lot of nominal TX power settings from
+0dBm to +20dBm; I don't trust these numbers the least, but I guess you
could calibrate them with a calibrated spectrum analyzer and use them.

An idea: you really don't want to do any processing on the signal. Now,
as much as I like GNU Radio and USRPs, you really don't need to use
either if you just want an adjustable amplifier. You can probably just
use the tools that exist on Linux for the wifi devices to adjus the TX
power.

Also, what you want is really something that basically is analog in
nature; maybe two antennas, a circulator at each one of them and an LNA
in RX and an adjustable amplifier in TX direction would serve you better?

> By the way, I want to ask, is there any relay that suits for me on the market?
So: Many (most, probably) Access Points and repeaters are actually Linux
boxes that run the drivers for the WiFi chipset and Access Point
software (such as HostAPd). Did you already set up an Access Point on
your PC and experiment with it? It might very well be worth the time, as
you might be able to adjust quite a lot of the parameters.

Best regards,
Marcus
On 13.12.2015 16:29, Shilei Tian wrote:
> Dear all,
>
> Recently, I'm working on a subject about wireless relay network energy 
> efficiency, and I want to do do some experiments, so I need a wireless relay 
> whose wireless signal power is adjustable. The client nodes are mobile 
> devices, like Android phones, iPhones, and iPads.
>
> My idea now is to use USRP(I own N210 now) and GNU Radio. The USRP implements 
> the RF side of Wi-Fi, and GNU Radio implements all protocols, like MAC, NAT 
> and DHCP Server, just make it a wireless router. But the work is so huge, so 
> I'm afraid that I cannot make it. Besides, I've read the paper "An IEEE 
> 802.11a/g/p OFDM Receiver for GNU Radio", but it could only work on the pure 
> OFDM mode, which my clients don't support.
>
> So I want to ask whether there are existing 3rd party GNU Radio modules that 
> could do this job.
>
> Wow, a new idea occurs to me, could the USRP only amplify the Wi-Fi signal of 
> the selected base station? For example, I have a base station, whose SSID is 
> "Base_Station", "my relay" (USRP + GNU Radio) receives the signal from the 
> base station and amplify it. If the mobile devices connect to my "replay" 
> want to send data, it sends to "my relay", my relay receive it and then send 
> to the base station, transmission done. In this way, the assignments of IP 
> address and NAT service are still finished by the base station. In this way, 
> "my relay" don't need to implement protocols. Can this way work?
>
> By the way, I want to ask, is there any relay that suits for me on the market?
>
> --
>
> Sincerely yours,
>
> Shilei Tian（田世磊）
> Postgraduate Student
> Department of Computer Science and Engineering
> Shanghai Jiao Tong University
>
>
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Re: [Discuss-gnuradio] How to receive existing AP's signal using gr-ieee802-11?

[Ke Xu]

Bastian Bloessl-2 wrote
> Hi,
> 
> I only have some tips that you might want to try.
> 
> - set the lo_offset to 11M
> - use the LMS equaliser (the other one is total non-sense :-)
> - change the gain
> - use the 5GHz band or assert that it’s really purge-G (non-compatible
> mode)
> 
> The last one is important. In the 5GHz-band you usually have 11a, which is
> perfectly fine.
> In the 2.4GHz band 11g is often in a mode that is backwards compatible
> with 11b. This mode uses a different preamble that is currently not
> supported.
> 
> Some APs (or a MacBook) can be configured to use 11g-only mode. These
> frames should work.
> 
> Best,
> Bastian
> 
> 
>> On 09 Dec 2015, at 17:50, Ke Xu 

> kexukezhao@

>  wrote:
>> 
>> Hi everyone!
>>  I am a beginner of GNU Radio and i'm studying 802.11 recently.I
>> found
>> a very nice work in https://github.com/bastibl/gr-ieee802-11/tree/master
>> and
>> it does me a great favor. I connected two USRP B210,one run wifi_tx.grc,
>> the
>> other run wifi_rx.grc, it worked and i can see the decoded "hello world"
>> in
>> my terminal.But when i use the wifi_rx.grc to receive existing WIFI
>> signal(such as wifi in home) to get the AP' SSID,it failed,i got nothing
>> but
>> disorder code(i enabled the debug in OFDM Decode MAC block).It seems that
>> the flow breaks in the checking checksum step because the checksum is not
>> equal to 558161692,the OFDM Parse MAC block has never been excuted.
>>  What shall i do? Chould the wifi_rx.grc receive existing WIFI signal
>> correctly? I notice that the receiver is limited to BPSK and QOSK, does
>> this
>> caused the problem? I'm not familiar with CRC, can anyone explain why the
>> checksum is a constant?
>> Thanks in advance! Any advice will be welcome! 
>> 
> 
> 
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Hi,Bastian
Thanks for your advice and time. 

I have tried what you have said. I use a wireless router as the AP, as it
does not support 11a, I cannot use the 5G band, but it support '11g-only',
so i set it to this mode. And in my testbed, there are many other APs, i
have no idea which mode they operate on. I also annotate the checksum
operation in 'OFDM Ddcode MAC' block because if don't, I will get nothing
output in my terminal. I set the sample rate of my USRP N210 to 20M. 

Sometimes I can get some meaningful string output but it is not sent by my
AP. I also get some beacon frames rarely, however its decoded SSID is messy
code. What confused me is that I can see a lot of decoded mac address which
belong to other APs in my testbed and none for my own AP.

Best regards,
Ke Xu



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[Discuss-gnuradio] GNU Radio release 3.7.9rc1 tarball and Live SDR Environment image available

[Johnathan Corgan]

GNU Radio release 3.7.9rc1 is available for testers to download from:

http://gnuradio.org/releases/gnuradio/gnuradio-3.7.9rc1.tar.gz
http://gnuradio.org/releases/gnuradio/gnuradio-3.7.9rc1.tar.gz.asc (GPG
detached signature)

GNU Radio Live SDR Environment ISO Image

http://s3-dist.gnuradio.org/ubuntu-14.04.3-desktop-amd64-gnuradio-3.7.9rc1.iso
http://s3-dist.gnuradio.org/ubuntu-14.04.3-desktop-amd64-gnuradio-3.7.9rc1.iso.asc
The GNU Radio Project is now be providing digitally signed releases using
the following key:

*pub*  3072D/BB8ED9B2

2015-08-28
 Fingerprint=B90D DFAC 5698 9BF6 2262  EB81 2987 C77C BB8E D9B2
*uid* GNU Radio Project (Admin) 
sig  sig3  BB8ED9B2

2015-08-28 __ 2017-08-27 [selfsig]

sig  sig   671DA2F7

2015-08-28 __ __ Johnathan Corgan


sig  sig   D65EF422

2015-08-28 __ __ Thomas Rondeau 



This release candidate is mainly targeted at distribution maintainers and
Live SDR Environment users and is a snapshot of the GNU Radio git
repository master branch at tag v3.7.9rc1.  Release notes are still in
progress.

-- 
Johnathan Corgan
Corgan Labs - SDR Training and Development Services
http://corganlabs.com
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Re: [Discuss-gnuradio] How to receive existing AP's signal using gr-ieee802-11?

[Bastian Bloessl]

Hi,

> On 13 Dec 2015, at 16:36, Ke Xu  wrote:
> 
> 
> 
> I have tried what you have said. I use a wireless router as the AP, as it
> does not support 11a, I cannot use the 5G band, but it support '11g-only',
> so i set it to this mode. And in my testbed, there are many other APs, i
> have no idea which mode they operate on. I also annotate the checksum
> operation in 'OFDM Ddcode MAC' block because if don't, I will get nothing
> output in my terminal. I set the sample rate of my USRP N210 to 20M. 
> 
> Sometimes I can get some meaningful string output but it is not sent by my
> AP. I also get some beacon frames rarely, however its decoded SSID is messy
> code. What confused me is that I can see a lot of decoded mac address which
> belong to other APs in my testbed and none for my own AP.
> 

I’m not sure what you mean with ‘annotate the checksum’, but if you disabled 
the CRC check it’s no wonder when you see corrupt frames.

Instead of disabling the CRC,  you should try to find out what goes wrong. 
Maybe you want to try the other things from the last email.

Best,
Bastian


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[Discuss-gnuradio] (no subject)

[vingnu GNU]

Hi every one,

Is this possible to generate step frequency continuous wave for frequency
range of 2GHz to 4GHz in GNU radio and step size in range of 250micro
seconds(Dwell time).

regards
Vingnu
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