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Today's Topics:
1. Re: Difference between set_rx_rate/set_tx_rate and
set_master_clock_rate (Josh Blum)
2. Re: R: RE: Synchronization problem (Mike McLernon)
3. Re: Multiple-carrier signal with Simulink and USRP2
(Mike McLernon)
4. Re: Multiple-carrier signal with Simulink and USRP2
(Mike McLernon)
----------------------------------------------------------------------
Message: 1
Date: Wed, 02 Mar 2011 10:33:12 -0800
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Difference between set_rx_rate/set_tx_rate
and set_master_clock_rate
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 03/02/2011 06:17 AM, Pol Henarejos wrote:
> Hi list,
>
> Which is the difference between set_rx_rate/set_tx_rate and
this is the rate of samples between host and device
> set_master_clock_rate?
>
this is the clock rate in Hz for the FPGA, DSP, DAC, ADC
-josh
------------------------------
Message: 2
Date: Wed, 2 Mar 2011 20:02:19 +0000
From: Mike McLernon <[email protected]>
To: Massimo Piras <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] R: RE: Synchronization problem
Message-ID:
<e3879be9a282cb45aab7ce258a9ae48f059...@exmb-01-ah.ad.mathworks.com>
Content-Type: text/plain; charset="utf-8"
Hi Massimo,
Here are the steps to frame sync:
1. Prepend a Barker code to your data. Make sure that it is unipolar.
2. Modulate the signal, send it to the USRP I/O block, and through the
board.
3. On the receive side, perform a cross-correlation between your received
data and the known Barker code. At this point, transform your data from
unipolar to bipolar. The peak of the correlation indicates the delay. You can
examine the Find Delay block to see how this is done with Simulink blocks.
4. If you need to process your data on a frame boundary, then once you
find the delay, just tack on an additional delay to get your data aligned on
that frame boundary.
Hth,
Mike
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Massimo Piras
Sent: Wednesday, March 02, 2011 10:56 AM
To: [email protected]
Subject: [USRP-users] R: RE: Synchronization problem
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!!!!
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mc_id=01fw
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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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------------------------------
Message: 3
Date: Wed, 2 Mar 2011 20:08:22 +0000
From: Mike McLernon <[email protected]>
To: "[email protected]" <[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 Paola,
Can you send a model to me?
Mike
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, March 02, 2011 9:40 AM
To: Nick Pers
Cc: Mike McLernon; [email protected]
Subject: Re: Re: [USRP-users] Multiple-carrier signal with Simulink and USRP2
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
>
>
>
>
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Message: 4
Date: Wed, 2 Mar 2011 20:13:36 +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,
Can you send a model?
Mike
From: Nick Pers [mailto:[email protected]]
Sent: Wednesday, March 02, 2011 9:27 AM
To: Mike McLernon
Cc: [email protected]
Subject: Re: [USRP-users] Multiple-carrier signal with Simulink and USRP2
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<mailto:[email protected]>
To: Nick Pers<mailto:[email protected]>
Cc: [email protected]<mailto:[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]<mailto:[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 7
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