On Mon, Apr 2, 2012 at 11:45 AM, Anh Duc Nguyen <
address@hidden> wrote:
> Dear all,
>
> I have a question on the order of the processing stages for the psk
> receiver.
> As I have seen from some source code (e.g., dqpsk.py in earlier version of
> GnuRadio 3.4.2 backwards), the sequence of blocks for a psk receiver is:
>
> AGC -> RRC filter -> mpsk receiver (mpsk_receiver_cc) -> differential
> decoding -> symbol demapping (find closest constellation point) -> gray code
> decoding (optional) -> and so on.
>
> My confusion here is why the differential decoding is placed before the
> symbol demapping block, while as my usual thought the demapping should goes
> ahead of the differential decoding stage.
>
> Can anyone explain that to me or just show me the related documents, i would
> be greatly grateful for it,
>
> With best regards,