Hello all
i am looking at gmsk again. i had two questions come up.
1) does clock recovery normally take place after fm demod?
2) what clock recovery algo would one normally find in a receiver like
a GSM receiver?
thanks
jeff
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Discuss-gnuradio mai
Eric Blossom wrote:
(Don't use the ext3 filesystem if you've got to stream continuously.)
Ian, Eric:
At Eric's suggestion, I switched to ext2 and as he guessed, I had no
trouble writing 4e6 complex shorts/sec to disk with file_sink.
Chris
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Di
I am part of the Hydra group at UT Austin
(http://hydra.ece.utexas.edu). We have developed a MIMO prototype
utilizing GNU Radio & the USRP board. The physical layer for our
design is based on the draft standard for IEEE 802.11n. Our current
system is designed to support 2 antennas (i.e. utilizing o
Max,
it seems like this transmission scheme can be modeled using a finite
state machine (fsm). Take a look at the gr_trellis section of gnuradio.
There you can find an abstract class to define fsm's and to
encode/decode their inputs/outputs.
Achilleas
Max Moser wrote:
Sorry for that, shure i
Sorry for that, shure i would be happy to provide you some
information i am currently stuck anyways in developing a decoder
because i am not the best in signaling stuff :-)
Ok well i know that the signal is Miller encoded (Aka Delay encoded)
On this website you can see a short description:
On Thu, Aug 23, 2007 at 07:13:36PM +0200, Dominik Auras wrote:
> Hi!
>
> I think that you can reproduce this behaviour easily by creating a
> hierblock2 without connecting the input port.
>
> Dominik
Thanks. Logged as ticket:174
Eric
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Roshan Baliga wrote:
> In any case, if anybody uses a laptop with ubuntu and gnuradio, I'd love
> to know about it, because I need to buy a laptop for some testing.
> Preferably something on the cheaper side, but not a 8 lbs brick.
Not cheap, but I use a Thinkpad T60 with Ubuntu 7.04 64-bit versi
Hi All,
I looked through the gnuradio archive, and couldn't find this topic, so
I'm posting.
Does anyone have a current recommendation for a laptop for use with
gnuradio? I've never had a problem with any desktop running Ubuntu
6.0.6, but the first laptop I tried (Dell Latitude D520) had rx
On Thu, Aug 23, 2007 at 12:03:25PM -0400, George Nychis wrote:
> Hey all,
>
> I'm slightly confused. I'm trying to find an antenna to use with the
> basic TX/RX boards to transmit and receive over the air. What frequency
> ranges do the basic TX/RX boards do? After checking the wiki, it just
George Nychis wrote:
> but what does Field Tunable mean?
It means you cut the element to the right length to resonate at the
center frequency you want :-)
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com
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Discuss-gnuradio m
thanks for the responses!
I'm looking at this antenna:
http://www.pasternack.com/product-Mobile-Antenna-Field-Tunable-%C2%AC-wave-118--940-MHZ-PE51001-77521.html
but what does Field Tunable mean?
- George
Brian Padalino wrote:
On 8/23/07, Dan Halperin <[EMAIL PROTECTED]> wrote:
-BEGIN P
Hi!
I think that you can reproduce this behaviour easily by creating a
hierblock2 without connecting the input port.
Dominik
start: entered
flattening ofdm_rx
Flattening edge file_source(1):0->throttle(75):0
Flattening edge throttle(75):0->receive_path(2):0
Resolving endpoint receive_path(2):0 a
On 8/23/07, Dan Halperin <[EMAIL PROTECTED]> wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Note that Matt has claimed in the past (and I've partially verified)
> that the Basic boards can go as low as about 100kHz.
>
> - -Dan
Noted (both mentally and on the wiki pages). Thanks!
Br
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Note that Matt has claimed in the past (and I've partially verified)
that the Basic boards can go as low as about 100kHz.
- -Dan
Brian Padalino wrote:
> On 8/23/07, George Nychis <[EMAIL PROTECTED]> wrote:
>> Hey all,
>>
>> I'm slightly confused. I'
On 8/23/07, George Nychis <[EMAIL PROTECTED]> wrote:
> Hey all,
>
> I'm slightly confused. I'm trying to find an antenna to use with the
> basic TX/RX boards to transmit and receive over the air. What frequency
> ranges do the basic TX/RX boards do? After checking the wiki, it just
> says "baseb
Marcus Leech schrieb:
> 김상원 wrote:
>
>> When I used the TVRX and USRP main board for receiving TV signals, I
>> found that the usrp 64MHz Xrystal leakage is serious.
>>
>>
> I see this with the DBS_RX.
>
> My front end is a dish, with about 45dB of low-noise gain right up at
> the dish. The
Hey all,
I'm slightly confused. I'm trying to find an antenna to use with the
basic TX/RX boards to transmit and receive over the air. What frequency
ranges do the basic TX/RX boards do? After checking the wiki, it just
says "baseband." Doing some research, I think it means a band of
freq
Ed Criscuolo wrote:
> Another thought occured to me. Since the LFTX daughterboard goes down
> to DC, shouldn't it be posible to use it to output the bitstream?
> It's a bit of a kludge, but it should be easy. Comments?
That could work. You have a maximum output voltage swing of +-1V open
circui
Eric Blossom wrote:
>1) Is ppio_ppdev fast enough to keep up with this bitrate?
I doubt it. It just bit bangs the serial port. Thus you've got no control
of the data rate, etc.
I assume you meant the parallel port. I suspected as much. I was just
hoping that it would keep up with my low
Max,
could you describe in a bit more detail what is the
decoding function you want to implement.
Chances are it is already implemented in gnuradio.
Achilleas
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Hi!
If I forget to connect a port of an hierblock2, I will get a confusing error
message:
RuntimeError: block is not a valid gr_block or gr_hier_block2!
It would be useful if you check this upon entering the flattening process
for example and give a more useful message. The debug trace finally po
김상원 wrote:
> When I used the TVRX and USRP main board for receiving TV signals, I
> found that the usrp 64MHz Xrystal leakage is serious.
> Even though there is no input signals, very strong leakage sinal is
> ovserved every 16MHz(16MHz*n) and 64MHz(64MHz*n) frequencies.
> I think USRP board need m
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On Thu, Aug 23, 2007 at 08:30:03AM -0500, Arnie Shore wrote:
> Just a lurker here, but I'm always curious/sceptical when I hear that
> function X must be programmed in language Y. Can someone confirm and
> explain?
>
> Arnie Shore
It is technically possible to write signal processing code for GN
On Thu, Aug 23, 2007 at 04:20:20PM +0200, Max Moser wrote:
> Hi List,
>
> well i got much further and was able to gather the signal and am
> shure that it is a Miller encoding (Also known as delay encoding). So
> i like to build now a parser/decoder for that protocol. As far as i
> understan
Just a lurker here, but I'm always curious/sceptical when I hear that
function X must be programmed in language Y. Can someone confirm and
explain?
Arnie Shore
On 8/23/07, Max Moser <[EMAIL PROTECTED]> wrote:
>
> ... decoding blocks have to be in C C++ right? Is it
> possible to write the proce
Hi List,
well i got much further and was able to gather the signal and am
shure that it is a Miller encoding (Also known as delay encoding). So
i like to build now a parser/decoder for that protocol. As far as i
understand gnuradio, decoding blocks have to be in C C++ right? Is it
possibl
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