Abstract
An improved feed-forward carrier phase estimation
scheme with further complexity reduction is presented
and numerically verified for quadrature amplitude
modulation (QAM) formats. Based on the blind phase
search (BPS) algorithm, a general two-stage
configuration is first derived by removing several
restrictions assumed in the prior art. Two guidelines
for determining the design parameters are then proposed
to minimize the computational complexity while
mitigating the pattern effect and maintaining the
tolerance to laser linewidth. Taking square 64QAM as an
example, the computational efforts can be reduced by a
factor of 4 while keeping the same tolerance to laser
linewidth as compared to a single-stage BPS
estimator.
© 2011 IEEE
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