Bits to frame

GNU Radio
1

What is the GNURadio method to convert bits into a
frame. A frame is a set of bits which constitutes and
complete message. The data stream usually comes in
having a dotting, syncword, message-bits format. How
can I put all of this in a set/frame and send it to
the next block as a set/frame. Also, how does the
receiving block accept data on a per set/frame method?

Thanks,

George B.
[email protected]

2

Eric,

In the meantime while I wait for the mblock to be
stable, I plan to use the simplest method to pass say
100 bits of data messages at a time to a GNURadio
block. This GNURadio block I plan to create will
accept the first 100 bits as a message and each
subsequent 100 bit blocks as messages. Of course, of
this block is off by even 1 bit, the messages will not
be retrieved correctly. My question is would this
simple method work and how reliable would it be?

Thanks,

— Eric B. [email protected] wrote:

to

To fully utilize
it with the USRP, we’ll also need the
inband-signaling extensions for
the USRP. Those will will take longer to complete.
We’re currently
estimating May for those.

The work is taking place in the svn repository here:

http://gnuradio.org/svn/gnuradio/branches/features/inband-usb

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/pmt/src/lib/pmt.h

The primary interfaces:

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_runtime.h

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_mblock.h

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_message.h

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_port.h

Eric

George B.
[email protected]

3

On Sun, Apr 08, 2007 at 12:28:34PM -0700, George B. wrote:

simple method work and how reliable would it be?

Thanks,

With fixed length messages everything should work fine.

Eric

4

On Sun, Apr 08, 2007 at 03:01:23AM -0700, George B. wrote:

George B.
[email protected]

Hi George,

You’ll want to use the new mblock features.
http://gnuradio.org/trac/wiki/MessageBlocks

The wiki page and BBN doc are a bit out of date. See the files below
for the current API.

This is work-in-progress, and not currently usable. However, I expect
to have much of it working sometime later this week. To fully utilize
it with the USRP, we’ll also need the inband-signaling extensions for
the USRP. Those will will take longer to complete. We’re currently
estimating May for those.

The work is taking place in the svn repository here:

http://gnuradio.org/svn/gnuradio/branches/features/inband-usb

The files below provide the bulk of the API. It’s still moving around
a bit, but the basic flavor is unlikely to change much.

Polymorphic types (similar to Python or LISP data types):

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/pmt/src/lib/pmt.h

The primary interfaces:

http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_runtime.h
http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_mblock.h
http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_message.h
http://gnuradio.org/trac/browser/gnuradio/branches/features/inband-usb/mblock/src/lib/mb_port.h

Eric