Re: [oc] RS Codec

["Lior Shtram" <lior@mindless.com>]

Hello all,
    I have a lot of experience in development of digital modems. I first
thought of helping the opencores with developing some kind of USB
controller, but as the USB project in not yet on the way, I might be of more
help with the digital modem project.
    I have done a modem with a combination of RF elements and digital
element to save on logic elements. I was hoping of getting to code the whole
thing on an FPGA. There are a few digital ASICs I have considered using in
making a digital modem, those are of graychip company www.graychip.com
please take a look at those. They can help also because they should most of
their implementation in the data sheets. Those devices are suitable for
realy high speeds of data, impressive. So we might consider a high speed
modem also.
    Also I am interested in two more things. One is the systemC you talked
about. I have been considering working with systemC for quite a while, I
have downloaded the code and read some of the instructions. I have some
problems in trying to make some models using the system but that is for
later discussions, what I still don't know is how do you synthesize the
systemC code into an FPGA. Are there sythesizers already made for this
purpose?
    Another issue is of free tools. I have some commertial tools I am
working in, but I promised not to use those for non job related work. Can
you tell me of a working configuration for VHDL environment (I mean
compiler, simulator, wave display, synthesize and so on) till now I have
checked a lot of free stuff but none of them could realy do the job.

Thanks, Lior Shtram

> Hi Brian ,
> writing c model is fine , have a look at www.systemc.org ,
> shall we start of with modulater , the c models can be synthesized into
> hardware directly .
>
> On Tue, 13 Jun 2000, Brian Edmonston wrote:
>
> > > yeah , that's fine. i have intelsat specs for IDR modems , we can just
> > > take mod , demod portion of the specs and try an all digital
> > > implementation , did u think abt testing , simulation and other stuffs
?
> > > how shall we do it ?
> >
> > Well, I was hoping to build a bit exact c model first.  We could use
that to
> > generate test vectors.  For actual testing we could use a FPGA board,
but
> > that is a ways off...
> >
> > There was one other person who was interested.  Three people might be
enough
> > to get things rolling.
> >
> > -b
> >
> > intelsat specs , i don't have a soft copy and so i'll
> > > write abt mod demod portion alone at the time of starting...
> > > bye
> > >
> > > On Mon, 12 Jun 2000, Brian Edmonston wrote:
> > >
> > > >
> > > > By simple, it should have timing and frequency recovery, and maybe
IF
> > > > downconvertion (actually kind of simple).  No equalization tho.
Assume
> > AWGN
> > > > channel, is what I mean.
> > > >
> > > > The intelsat spec is probably a good starting point.   Do you have
that
> > > > available?
> > > >
> > > >
> > > > -b
> > > >
> > > > ----- Original Message -----
> > > > From: Nanda Kumar K.G <nanda@cdotb.ernet.in>
> > > > To: <cores@opencores.org>
> > > > Sent: Monday, June 12, 2000 12:14 PM
> > > > Subject: Re: [oc] RS Codec
> > > >
> > > >
> > > > >
> > > > > Hi Brian Edmonston ,
> > > > > Yeah , single chip QPSK demodulator might be attempted but if it's
> > > > > simple( subjective term and i can't comment on it :-)} it might
not
> > > > > usable. We can try by taking some specs like INTELSAT specs for
QPSK
> > > > > modems and try to attempt it , or we can plunge directly into
Turbo
> > TCM
> > > > > modems ... ???
> > > > >
> > > > >  On Mon, 12 Jun 2000, Brian Edmonston wrote:
> > > > >
> > > > > > Yes.
> > > > > >
> > > > > > I am also interested in developing a simple, but useable,
> > > > QPSKdemodulator.
> > > > > > Would that be of interest?
> > > > > >
> > > > > > -b
> > > > > >
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: Nanda Kumar K.G <nanda@cdotb.ernet.in>
> > > > > > To: <cores@opencores.org>
> > > > > > Sent: Monday, June 12, 2000 9:32 AM
> > > > > > Subject: [oc] RS Codec
> > > > > >
> > > > > >
> > > > > > > i would like to develop RS codec for opencores , iam currently
> > doing
> > > > > > > research in modems for SAT COM and turbo codes , is anybody
> > interested
> > > > ?
> > > > > > >
> > > > > > >
> > > > > >
> > > >
> >
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > > > K.G.Nanda Kumar
> > > > > > > Research Engineer
> > > > > > > SAT COM  C-DOT
> > > > > > > 71/1,millers road
> > > > > > > Bangalore 560052
> > > > > > > ph:2263399 Extn 323
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> >
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > K.G.Nanda Kumar
> > > > > Research Engineer
> > > > > SAT COM  C-DOT
> > > > > 71/1,millers road
> > > > > Bangalore 560052
> > > > > ph:2263399 Extn 323
> > > > >
> > > >
> > > >
> > >
> > >
> >
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > K.G.Nanda Kumar
> > > Research Engineer
> > > SAT COM  C-DOT
> > > 71/1,millers road
> > > Bangalore 560052
> > > ph:2263399 Extn 323
> > >
> >
> >
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> K.G.Nanda Kumar
> Research Engineer
> SAT COM  C-DOT
> 71/1,millers road
> Bangalore 560052
> ph:2263399 Extn 323
>