carrier recovery in a QPSK receiver

It's a secret ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

thanks telling me that :(

It's like a Costas loop.

Google on "clock recovery" and QPSK

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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 !

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

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

It sounds like you should be posting on news:sci.electronics.basics if you don't know what a PLL is.

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

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

Now it's all done in software.