Abstract
Digital optical and radio transmission systems based on high order modulations can be severely impaired by phase noise affecting the local oscillators used for up-conversion and down-conversion. Pilot symbols can be of help in mitigating the impact of phase noise. This paper proposes a pilot-aided demodulation scheme where phase noise tracking is performed by a trellis-based 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 coded 4096-QAM.
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