Abstract
In a previous paper ,
we noted when the transmitted signal constellations has rotational symmetry,
laser phase noise can be mitigated using non-data-aided (NDA) feedforward
(FF) carrier recovery. The structures of a FF carrier recovery unit and a
NDA soft-decision phase estimator were shown in Fig. 3 and 4(a), respectively.
We have found that in an NDA FF carrier recovery unit, the order of the linear
filter and phase estimator can be exchanged in a manner not possible with
a decision-directed (DD) FF carrier recovery unit. We show that this alternative
NDA (ANDA) FF carrier recovery unit exhibits better immunity to cycle slips
compared to standard NDA.
© 2009 IEEE
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