[<<][staapl][>>][..]

Fri Dec 7 09:36:31 CET 2007

cordic

the most elegant solution seems to be to use a cordic I,Q->A,P
transform, so both the AGC and PLL have proper data to work on.

For use in the demodulator, the constant scaling factor is not a
problem. What I would like to do is to perform sequential updates: use
Q to update I and then use the updated I to update Q. With a=s2^(-n)
this amounts to:

| 1  a |   | 1  0 |    | 1 + a^2   a |
|      | * |      | =  |             |
| 0  1 |   | a  1 |    | a         1 |

Which is no longer a scaled rotation. Correcting this looks like more
hassle than just performing the update in parallel.

I don't need a lot of phase resolution. 8 bit is definitely enough.

Hmm.. Is going to be a lot of work..

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