Send USRP-users mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of USRP-users digest..."
Today's Topics:
1. Re: Multiple-carrier signal with Simulink and USRP2
([email protected])
2. R: RE: Synchronization problem (Massimo Piras)
----------------------------------------------------------------------
Message: 1
Date: Wed, 02 Mar 2011 14:40:25 +0000
From: [email protected]
To: Nick Pers <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] Multiple-carrier signal with Simulink and
USRP2
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed";
DelSp="yes"
Hi,
I am having a problem similar to Nick's. I have built a simplified OFDM
model with 16 subcarriers where the column vector that I send to the USPR2
Transmitter block (after zero pad, ifft and cyclic prefix) is 80x1. I
connect my USPR2 device to a spectrum analyzer but I don't get anything
similar to the spectrum displayed by the simulink spectrum scope block.
I have already tried to change my frames to have a length of 358 samples
instead of 80, but it doesn't help.
I would really appreciate any suggestions. Thanks in advance.
Regards,
Paola.
Am schrieb Nick Pers <[email protected]>:
> Yes Mike, this is the demo that I use to
> transmit/create OFDM signals. I have connected a USRP2 Transmitter and a
> FFT
> Spectrum Scope block.
> The Scope shows the OFDM signal as it should
> be, but it is is different from the USRP2 transmitted signal (monitored
> with a spectrum analyzer).
> I am trying to figure out if there is a
> problem with firmware, USRP2 Transmitter block or something else.
> Have you tried this?
> Nick
> ----- Original Message -----
> From:
> Mike McLernon
> To: Nick Pers
> Cc: [email protected]
> Sent: Wednesday, March 02, 2011 4:03
> PM
> Subject: RE: [USRP-users]
> Multiple-carrier signal with Simulink and USRP2
> Hi
> Nick,
> The
> serialized data should be in a column vector format. To see an example
> of OFDM in the Comms Blockset, type 'commwlan80211a' at the MATLAB command
> prompt. That 802.11a demo shows a way to create multiple OFDM symbols,
> then serialize them at the transmitter output.
> Hth,
> Mike
> From: Nick Pers
> [mailto:[email protected]]
> Sent: Wednesday, March 02, 2011 6:00
> AM
> To: Mike McLernon
> Cc: [email protected]
> Subject:
> Re: [USRP-users] Multiple-carrier signal with Simulink and
> USRP2
> Hi Mick and
> all,
> I have already
> tried to send serialized data to the USRP2 Transmitter block but I
> dont get the desired result.
> Is there a special
> way I should use to send the serialize data?
> Could you please
> send me or point me a simple working example?
> Thanks
> Nick
> ----- Original
> Message -----
> From: Mike McLernon
> To: Nick Pers
> Cc: [email protected]
> Sent: Tuesday, March
> 01, 2011 4:06 PM
> Subject: RE: [USRP-users]
> Multiple-carrier signal with Simulink and USRP2
> Hi
> Nick,
> It
> certainly is possible, but you will have to serialize the data first.
> The USRP2 Transmitter block accepts only column vector
> inputs.
> Hth,
> Mike
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Nick
> Pers
> Sent: Tuesday, March 01, 2011 6:33 AM
> To: [email protected]
> Subject:
> [USRP-users] Multiple-carrier signal with Simulink and
> USRP2
> Hi
> all,
> Is it possible to
> transmit multiple carrier signal (OFDM) with Simulink and
> USRP2?
> Thanks,
> NIck
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20110302/2bf42c9e/attachment-0001.html>
------------------------------
Message: 2
Date: Wed, 2 Mar 2011 16:56:09 +0100 (CET)
From: Massimo Piras <[email protected]>
To: [email protected]
Subject: [USRP-users] R: RE: Synchronization problem
Message-ID:
<7164150.738261299081369932.JavaMail.defaultUser@defaultHost>
Content-Type: text/plain;charset="UTF-8"
The transmission and reception are in two different models. I'm not an
expert in Simulink and I'm not sure I understand what you suggested for
synchronization.
I was thinking to add a preamble to transmit data,
and to begin receiving until I note that the preamble itself. But I do
not know how. Explain briefly that I could use blocks in simulink to
sync? Thank you and sorry for my English!!
----Messaggio originale----
Da: [email protected]
Data: 02/03/2011 15.00
A: "Massimo
Piras"<[email protected]>
Cc: "[email protected]"<usrp-
[email protected]>
Ogg: RE: [USRP-users] Synchronization problem
Hi Massimo,
If you are transmitting and receiving with two different
models, then the interpolation and decimation factors can be set
completely independently. Are you using one or two models?
Once
again, if you are using two models, you will have to sync the received
data using carrier and timing loops, and a frame sync capability.
Barker codes, available in the Comms Blockset, can be used for frame
sync.
Hth,
Mike
-----Original Message-----
From: usrp-users-
[email protected] [mailto:[email protected]] On
Behalf Of Massimo Piras
Sent: Wednesday, March 02, 2011 5:27 AM
To:
[email protected]
Subject: [USRP-users] Synchronization
problem
Hello. I have solved my problems with the transmission block
USRP2
transmitter on Simulink, but I have some questions to ask about
receiving:
1) What is the relationship between the value of
interpolation in trasmission and the value of decimation in reception?
For example: if I set interpolation 400, the decimation that the value
should be set?
2) What should I do to sync the two phases of
transmission and reception?
Thanks!!!!
Supera i limiti: raddoppia la
velocit? da 10 a 20 Mega!
Risparmia con Tutto Incluso: telefono +
adsl 20 mega a soli 29,95 ? al mese per due anni!
SCONTO DI 240 EURO!
http://abbonati.tiscali.it/telefono-adsl/prodotti/tc/tuttoincluso/?WT.
mc_id=01fw
_______________________________________________
USRP-users
mailing list
[email protected]
http://lists.ettus.
com/mailman/listinfo/usrp-users_lists.ettus.com
Supera i limiti: raddoppia la velocit? da 10 a 20 Mega!
Risparmia con Tutto Incluso: telefono + adsl 20 mega a soli 29,95 ? al mese per
due anni!
SCONTO DI 240 EURO!
http://abbonati.tiscali.it/telefono-adsl/prodotti/tc/tuttoincluso/?WT.mc_id=01fw
------------------------------
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
End of USRP-users Digest, Vol 7, Issue 6
****************************************
