Abstract
A simplified quadrature amplitude modulation (QAM) feedforward carrier
recovery algorithm is proposed. By introducing a new two-stage estimation
structure and sliding-block approach, the required computational effort can
be significantly reduced with a tolerable performance deterioration compared
with the original algorithm. In order to choose the size of the sliding
block properly, an analytical model is proposed that takes the optical SNR
(OSNR) and the laser-linewidth-times symbol-rate product into account. The
model reveals different influence of OSNR and the laser-linewidth-times
symbol-rate product on the performance of any carrier recovery algorithm.
The performance of the simplified algorithm is evaluated by Monte Carlo
simulations for square 16-, 64-, and 256-QAM. The simulation results show
that the computational effort for each symbol can be significantly reduced
at the cost of a 11% reduction of laser linewidth tolerance.
© 2011 IEEE
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