Carrier Recovery for QPSK

Hi everyone,  

   As a part of problem, I have to implement carrier recovery in some
distributed MISO communication system. I was following one paper to
implement that problem which targeted to estimate the f offset in the range
of  (1 / (2Ts) ) ( for Ts is the oversampling time ). The f offset is
estimated with minute error about which author suggested the use of PLL to
handle it, but didn't refer any paper. There are many papers in IEEE
explore, which address to handle carrier recovery. Can anyone please tell
me of any paper from his experience , that you have implemented and working
and can handle small freq offset like in the range of ( 1/ (8Ts) ) for
QPSK?


Thanks in advance.

On Nov 7, 11:37&#4294967295;pm, "Ali A Nasir" <aliarsha...@hotmail.com> wrote:
> Hi everyone, &#4294967295;
>
> &#4294967295; &#4294967295;As a part of problem, I have to implement carrier recovery in some
> distributed MISO communication system. I was following one paper to
> implement that problem which targeted to estimate the f offset in the range
> of &#4294967295;(1 / (2Ts) ) ( for Ts is the oversampling time ). The f offset is
> estimated with minute error about which author suggested the use of PLL to
> handle it, but didn't refer any paper. There are many papers in IEEE
> explore, which address to handle carrier recovery. Can anyone please tell
> me of any paper from his experience , that you have implemented and working
> and can handle small freq offset like in the range of ( 1/ (8Ts) ) for
> QPSK?
>
> Thanks in advance.

There is a variant of the Costas loop that can be used for carrier
recovery with QPSK; you might try searching for that.

Jason