1 research outputs found
Pilot-aided trellis-based demodulation
In optical transmission systems based on high order modulations
the impact on system performance of Wiener phase noise affecting
the received carrier phase can be relevant. To make less severe
phase noise effects, solutions based on the use of known pilot
symbols, that aid carrier phase recovery, have been recently
introduced. This letter proposes a pilot-aided demodulation scheme
where the memory of phase noise is dealt with by a trellis-based
demodulation algorithm. The benefits in terms of achievable
information rate and bit error rate compared to adversary schemes
are demonstrated by computer simulations for strong phase noise
with 4-ary quadrature amplitude modulation (4-QAM) and 16-QAM