carrier recovery in a QPSK receiver

[[email protected]]

Hi

Im really new to comms

can somebody pls explain

"how carrier recovery can be achieved in a QPSK receiver"

i check on google and every where i couldnt find the way !

pls help me out

thanks a lot

 

[Jim Thompson]

Hi

Im really new to comms

can somebody pls explain

"how carrier recovery can be achieved in a QPSK receiver"

i check on google and every where i couldnt find the way !

pls help me out

thanks a lot

It's a secret ;-)

...Jim Thompson

 

[[email protected]]

thanks telling me that

 

[Jim Thompson]

thanks telling me that

It's like a Costas loop.

Google on "clock recovery" and QPSK

...Jim Thompson

 

[[email protected]]

i did google on QPSK
but couldnt find anything on carrier recovery !

thnaks for help me

 

[Jim Thompson]

i did google on QPSK
but couldnt find anything on carrier recovery !

thnaks for help me

Google Advanced...

Exact Phrase box... carrier recovery

With all the words box... QPSK

The very first item... a PLL clock re-insertion.

You ARE required to think ;-)

If you haven't studied the professor's notes... oh well... what can I
say?

...Jim Thompson

 

[[email protected]]

my bloody lecturer didnt give any notes in this subject area and gave
us this assignment

anyway i did the google advanced search

and i found this

Digital Receiver: Carrier Recovery

i saw that page earlier and it was all about a "The phase-locked loop
(PLL)" so i thought its not good for me
never heard of "phase-locked loop " before

thanks !

 

[[email protected]]

i did google on "QPSK", couldnt find anything on carrier recovery

 

[Ken Taylor]

i did google on "QPSK", couldnt find anything on carrier recovery

You're kidding, right?? Try again with QPSK and 'carrier recovery' both
in the search term.

Ken

 

[Rick]

Here is everything you would ever need to know about QPSK.

http://www.maxim-ic.com/appnotes.cfm/appnote_number/686

 

[Michael A. Terrell]

my bloody lecturer didnt give any notes in this subject area and gave
us this assignment

anyway i did the google advanced search

and i found this

Digital Receiver: Carrier Recovery

i saw that page earlier and it was all about a "The phase-locked loop
(PLL)" so i thought its not good for me
never heard of "phase-locked loop " before

thanks !

It sounds like you should be posting on if you don't know what a PLL is.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Richard Henry]

Google Advanced...

Exact Phrase box... carrier recovery

With all the words box... QPSK

The very first item... a PLL clock re-insertion.

You ARE required to think ;-)

If you haven't studied the professor's notes... oh well... what can I
say?

The very first time I saw a PLL circuit, I was trying to fix it. That's
educational.

 

[Jim Thompson]

The very first time I saw a PLL circuit, I was trying to fix it. That's
educational.

Yep. Hands-on beats all other forms of education.

...Jim Thompson

 

[Richard Henry]

Yep. Hands-on beats all other forms of education.

It was buried in the middle of an analog sonar analyzer. All kinds of stuff
in there that no one makes any more -- a delay-line time-compressor built
around a length of glass fiber, a D/A circuit built of discrete transistors
with two pots for each bit (the alignment procedure for that board had a
handwritten note in the margin - "I've got spurs that jingle, jangle,
jingle" - spurs being the nickname for spurious signals). That generation
of instruments was eventually replaced by all-digital FFT circuits that had
5V, 100A power supplies hung on the back of each cabinet.

Now it's all done in software.