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List: gnuradio-discuss
Subject: Re: [Discuss-gnuradio] Problem with receiver section in BPSK
From: Marcus_Müller <marcus.mueller () ettus ! com>
Date: 2015-05-30 18:03:39
Message-ID: 8B0297CD-A66D-46EF-9B78-4616A6D2584D () ettus ! com
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I'll reiterate: what do you do tree account for real world channels? You haven't told \
us *anything* about your transceiver aside from it using BPSK.
Best regards,
Marcus
Am 30. Mai 2015 20:00:51 MESZ, schrieb Anil Gaddam <gaddamanil16@gmail.com>:
> I was not getting anything till now but lately I made some changes and
> now
> I am getting the output but its no where similar like the input
> signal.And
> about the constellation I am not able to get it anywhere near perfect.
>
> Thanks,Marcus
> On 30-May-2015 23:07, "Marcus Müller" <marcus.mueller@ettus.com> wrote:
>
> > I don't understand -- are you seeing nothing at all or are you seeing
> ISI?
> >
> > Again: what's your pulse shape? Does it fit in your channel
> bandwidth? Do
> > you fulfill the Nyquist ISI criteria?
> >
> > As you know, there's solid theory in why ISI occurs, why you need to
> limit
> > your signal's bandwidth and how you can counter it. What parts of
> these
> > considerations did you address with your transceiver system? You only
> say
> > you do bpsk, but doing symbol mapping is only part of the job that a
> > transceiver needs to do.
> >
> > Best regards,
> > Marcus
> >
> > Am 30. Mai 2015 17:53:25 MESZ, schrieb Anil Gaddam
> <gaddamanil16@gmail.com
> > > >
> > >
> > > I am not getting anything on the output that's the issue if at all
> I'm
> > > getting some output then I would think about matched filtering .
> > >
> > > Thanks,
> > > Marcus
> > > On 30-May-2015 21:16, "Marcus Müller" <marcus.mueller@ettus.com>
> wrote:
> > >
> > > > Hi,
> > > >
> > > > On any multipath channel there will be some isi. What do you do to
> > > > suppress that? What kind of filtering/pulse shaping do you do? Does
> matched
> > > > filtering solve your issue?
> > > >
> > > > Best regards,
> > > > Marcus
> > > >
> > > > Am 30. Mai 2015 15:12:26 MESZ, schrieb Anil Gaddam <
> > > > gaddamanil16@gmail.com>:
> > > > >
> > > > > Hello everyone,
> > > > >
> > > > > I tried to implement bpsk system.I am successful with the
> transmission
> > > > > part but I am able to see the ISI when I am observing the
> constellation at
> > > > > the transmitter side. I tried to design the receiver side same as
> the
> > > > > transmitter but just the opposite way i.e, using block Psk demod
> and packet
> > > > > decoder, but I am not able to get anything on the receiver side.
> Can some
> > > > > one pls help me wid this.
> > > > >
> > > > > Regards,
> > > > > Anil Gaddam
> > > > >
> > > > > ------------------------------
> > > > >
> > > > > Discuss-gnuradio mailing list
> > > > > Discuss-gnuradio@gnu.org
> > > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > > > >
> > > > >
> > > > --
> > > > Sent from my Android device with K-9 Mail. Please excuse my
> brevity.
> > > >
> > >
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
[Attachment #5 (text/html)]
<html><head></head><body>I'll reiterate: what do you do tree account for real \
world channels? You haven't told us *anything* about your transceiver aside from \
it using BPSK.<br> <br>
Best regards,<br>
Marcus<br><br><div class="gmail_quote">Am 30. Mai 2015 20:00:51 MESZ, schrieb Anil \
Gaddam <gaddamanil16@gmail.com>:<blockquote class="gmail_quote" style="margin: \
0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <p \
dir="ltr">I was not getting anything till now but lately I made some changes and now \
I am getting the output but its no where similar like the input signal.And about the \
constellation I am not able to get it anywhere near perfect.</p> <p \
dir="ltr">Thanks,Marcus<br /> </p>
<div class="gmail_quote">On 30-May-2015 23:07, "Marcus Müller" <<a \
href="mailto:marcus.mueller@ettus.com">marcus.mueller@ettus.com</a>> wrote:<br \
type="attribution" /><blockquote class="gmail_quote" style="margin:0 0 0 \
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div>I don't understand -- are \
you seeing nothing at all or are you seeing ISI?<br /> <br />
Again: what's your pulse shape? Does it fit in your channel bandwidth? Do you \
fulfill the Nyquist ISI criteria? <br /> <br />
As you know, there's solid theory in why ISI occurs, why you need to limit your \
signal's bandwidth and how you can counter it. What parts of these considerations \
did you address with your transceiver system? You only say you do bpsk, but doing \
symbol mapping is only part of the job that a transceiver needs to do.<br /> <br />
Best regards,<br />
Marcus<br /><br /><div class="gmail_quote">Am 30. Mai 2015 17:53:25 MESZ, schrieb \
Anil Gaddam <<a href="mailto:gaddamanil16@gmail.com" \
target="_blank">gaddamanil16@gmail.com</a>>:<blockquote class="gmail_quote" \
style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid \
rgb(204,204,204);padding-left:1ex"> <p dir="ltr">I am not getting anything on the \
output that's the issue if at all I'm getting some output then I would think \
about matched filtering . </p> <p dir="ltr">Thanks,<br />
Marcus</p>
<div class="gmail_quote">On 30-May-2015 21:16, "Marcus Müller" <<a \
href="mailto:marcus.mueller@ettus.com" \
target="_blank">marcus.mueller@ettus.com</a>> wrote:<br type="attribution" \
/><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div>Hi,<br /> <br />
On any multipath channel there will be some isi. What do you do to suppress that? \
What kind of filtering/pulse shaping do you do? Does matched filtering solve your \
issue?<br /> <br />
Best regards,<br />
Marcus<br /><br /><div class="gmail_quote">Am 30. Mai 2015 15:12:26 MESZ, schrieb \
Anil Gaddam <<a href="mailto:gaddamanil16@gmail.com" \
target="_blank">gaddamanil16@gmail.com</a>>:<blockquote class="gmail_quote" \
style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid \
rgb(204,204,204);padding-left:1ex"> <p dir="ltr">Hello everyone,</p>
<p dir="ltr">I tried to implement bpsk system.I am successful with the transmission \
part but I am able to see the ISI when I am observing the constellation at the \
transmitter side. I tried to design the receiver side same as the transmitter but \
just the opposite way i.e, using block Psk demod and packet decoder, but I am not \
able to get anything on the receiver side. Can some one pls help me wid this.<br \
/></p> <p dir="ltr">Regards,<br />
Anil Gaddam</p>
<p style="margin-top:2.5em;margin-bottom:1em;border-bottom:1px solid \
#000"></p><pre><hr /><br />Discuss-gnuradio mailing list<br /><a \
href="mailto:Discuss-gnuradio@gnu.org" \
target="_blank">Discuss-gnuradio@gnu.org</a><br /><a \
href="https://lists.gnu.org/mailman/listinfo/discuss-gnuradio" \
target="_blank">https://lists.gnu.org/mailman/listinfo/discuss-gnuradio</a><br \
/></pre></blockquote></div><br />
-- <br />
Sent from my Android device with K-9 Mail. Please excuse my \
brevity.</div></blockquote></div> </blockquote></div><br />
-- <br />
Sent from my Android device with K-9 Mail. Please excuse my \
brevity.</div></blockquote></div> </blockquote></div><br>
-- <br>
Sent from my Android device with K-9 Mail. Please excuse my brevity.</body></html>
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