| Author |
Message |
Miso Soup Addict
Guest
|
 Posted:
Tue Dec 14, 2004 12:07 pm Post subject:
PSK help |
|
|
Hiya,
I have a heavily noise contaminated source (12db sig/noise)
which contains a BPSK signal.
I know the frequency, but obviously not the base phase or amplitude.
Does anyone know any algorithms/code to decode this, and get the
phase and ampltiude etc?
I have other semi stationary noise frequencies near the one in
question,
if that helps selection at all.
Any information, suggestions or even wild guesses warmly accepted.
I'm sure this question must come up quite a bit...
Thanks,
M. |
|
| Back to top |
|
 |
Mike Yarwood
Guest
|
| Posted:
Tue Dec 14, 2004 12:07 pm Post subject:
Re: PSK help |
|
|
"Miso Soup Addict" <mick_from-dsp@yahoo.com> wrote in message
news:1103008071.496249.227520@f14g2000cwb.googlegroups.com...
| Quote: | Hiya,
I have a heavily noise contaminated source (12db sig/noise)
which contains a BPSK signal.
I know the frequency, but obviously not the base phase or amplitude.
Does anyone know any algorithms/code to decode this, and get the
phase and ampltiude etc?
I have other semi stationary noise frequencies near the one in
question,
if that helps selection at all.
Any information, suggestions or even wild guesses warmly accepted.
I'm sure this question must come up quite a bit...
Thanks,
M.
Hi! quite like Miso soup myself - not sure why though. |
Yep , it comes up a lot , 12 dB SNR is not at all bad and you can just
matched filter , decimate and square to get a power estimate and phase
reference (assuming you know what your symbol rate and shaping is). As you
know what your frequency is you won't lose any signal power due to the
matched filtering and should be able to get a pretty good synchronisation.
You can then decide whether you would be better off without matched
filtering (e.g. if you don't have white noise at your receiver).
Best of Luck - Mike |
|
| Back to top |
|
|
Howard Long
Guest
|
| Posted:
Tue Dec 14, 2004 12:07 pm Post subject:
Re: PSK help |
|
|
"Miso Soup Addict" <mick_from-dsp@yahoo.com> wrote in message
| Quote: | I have a heavily noise contaminated source (12db sig/noise)
which contains a BPSK signal.
I know the frequency, but obviously not the base phase or amplitude.
Does anyone know any algorithms/code to decode this, and get the
phase and ampltiude etc?
|
http://www.qsl.net/ae4jy/ao40rcv.htm
Kind Regards, Howard |
|
| Back to top |
|
|
Eric Jacobsen
Guest
|
| Posted:
Wed Dec 15, 2004 2:21 am Post subject:
Re: PSK help |
|
|
On 13 Dec 2004 23:07:51 -0800, "Miso Soup Addict"
<mick_from-dsp@yahoo.com> wrote:
| Quote: | Hiya,
I have a heavily noise contaminated source (12db sig/noise)
which contains a BPSK signal.
I know the frequency, but obviously not the base phase or amplitude.
Does anyone know any algorithms/code to decode this, and get the
phase and ampltiude etc?
I have other semi stationary noise frequencies near the one in
question,
if that helps selection at all.
Any information, suggestions or even wild guesses warmly accepted.
I'm sure this question must come up quite a bit...
Thanks,
M.
|
For BPSK 12dB is actually a pretty high SNR. Synchronization of
BPSK/QPSK at 0-3dB SNR is done pretty frequently, so 12dB shouldn't be
too bad.
As others have suggested, using typical synchronizing loops will do
the job, e.g., a Costas loop for the carrier and a traditional symbol
recovery loop for the timing. There are quite a few texts out there
that have examples, so you might try browsing digital comm texts that
may be available to you.
Eric Jacobsen
Minister of Algorithms, Intel Corp.
My opinions may not be Intel's opinions.
http://www.ericjacobsen.org |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in