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Today's Topics:
1. Re: [Discuss-gnuradio] Re: UHD Announcement - February 25rd
2011 (Feng Andrew Ge)
2. Synchronization problem (Massimo Piras)
3. Synchronization problem (Massimo Piras)
4. Re: Multiple-carrier signal with Simulink and USRP2 (Nick Pers)
5. Re: Synchronization problem (Mike McLernon)
6. Re: Multiple-carrier signal with Simulink and USRP2
(Mike McLernon)
----------------------------------------------------------------------
Message: 1
Date: Tue, 01 Mar 2011 18:30:41 -0500
From: Feng Andrew Ge <[email protected]>
To: Marc Epard <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] [Discuss-gnuradio] Re: UHD Announcement -
February 25rd 2011
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
In my case, I used tunnel.py and the ping RTT time between two nodes
jumped to many seconds from time to time. It seems that data were
buffered somewhere.
Andrew
On 03/01/2011 06:16 PM, Marc Epard wrote:
> On Mar 1, 2011, at 5:08 PM, Feng Andrew Ge wrote:
>
>> However, I confirmed that the LONG GAPs Marc mentioned is severe, sometimes
>> up to many seconds. If possible, would you say some words on what you have
>> changed.
> Sorry, I didn't mean to imply gaps created by the UHD. The gaps were my own,
> as I was spending time editing MATLAB code, scratching my head, or whatever.
> During an actual measurement run, it does hundreds of tx+rx in a row with
> very little time between them. In both cases, the same C++ server process was
> keeping the UHD objects alive while waiting for another request. I've seen no
> unexpected delays between issuing a send and having it happen.
>
> -Marc
>
------------------------------
Message: 2
Date: Wed, 2 Mar 2011 11:25:03 +0100 (CET)
From: Massimo Piras <[email protected]>
To: [email protected]
Subject: [USRP-users] Synchronization problem
Message-ID:
<4118356.454791299061503489.JavaMail.defaultUser@defaultHost>
Content-Type: text/plain;charset="UTF-8"
Hello. I have solved the problems with the transmission block USRP2
transmitter on Simulink, I have some questions to ask at the reception:
1) what is the relationship between the value of interpolation in
transmission and the value of decimation in reception? For example: if
I set the 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
------------------------------
Message: 3
Date: Wed, 2 Mar 2011 11:26:33 +0100 (CET)
From: Massimo Piras <[email protected]>
To: [email protected]
Subject: [USRP-users] Synchronization problem
Message-ID:
<3155554.20341299061593507.JavaMail.defaultUser@defaultHost>
Content-Type: text/plain;charset="UTF-8"
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
------------------------------
Message: 4
Date: Wed, 2 Mar 2011 12:59:38 +0200
From: "Nick Pers" <[email protected]>
To: "Mike McLernon" <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] Multiple-carrier signal with Simulink and
USRP2
Message-ID: <7ED8E85E6F7746BC8D227797001D62F9@REX>
Content-Type: text/plain; charset="iso-8859-1"
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
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Message: 5
Date: Wed, 2 Mar 2011 14:00:24 +0000
From: Mike McLernon <[email protected]>
To: Massimo Piras <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Synchronization problem
Message-ID:
<e3879be9a282cb45aab7ce258a9ae48f059...@exmb-01-ah.ad.mathworks.com>
Content-Type: text/plain; charset="utf-8"
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: [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
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USRP-users mailing list
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------------------------------
Message: 6
Date: Wed, 2 Mar 2011 14:03:56 +0000
From: Mike McLernon <[email protected]>
To: Nick Pers <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] Multiple-carrier signal with Simulink and
USRP2
Message-ID:
<e3879be9a282cb45aab7ce258a9ae48f059...@exmb-01-ah.ad.mathworks.com>
Content-Type: text/plain; charset="us-ascii"
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<mailto:[email protected]>
To: Nick Pers<mailto:[email protected]>
Cc: [email protected]<mailto:[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]>
[mailto:[email protected]] On Behalf Of Nick Pers
Sent: Tuesday, March 01, 2011 6:33 AM
To: [email protected]<mailto:[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
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End of USRP-users Digest, Vol 7, Issue 4
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