Abstract
The impact from phase drifts in the different branches of parallel coherent
receivers is investigated and it is shown how the spectrum is broadened when the
receiver branches are not phase stabilized. Based on this, we propose a blind algorithm
for compensating these phase drifts in digital signal processing by minimization of the
spectral width. The algorithm performance is then evaluated by numerical simulations of
quadrature phase-shift keying data using return-to-zero modulation. It is found that the
algorithm is capable of identifying the phases with sufficient accuracy to make the
residual effect of the phase mismatches negligible compared to the signal distortion by
noise at a bit error rate of 10<sup>-3</sup>.
© 2011 IEEE
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