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Phase-Noise-Tolerant Two-Stage Carrier Recovery Concept for Higher Order QAM Formats

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2 Author(s)
Pfau, T. ; Bell Labs., Alcatel-Lucent, Murray, NJ, USA ; Noé, R.

In this paper, a phase-noise-tolerant two-stage carrier recovery concept for arbitrary quadrature amplitude modulation (QAM) constellations is presented. Possible implementations are evaluated in simulations of square 16-QAM, 64-QAM, and 256-QAM transmission systems, considering fourth-power and decision-directed carrier recovery for the first stage. The second stage uses QAM feedforward carrier recovery. It is shown that the two-stage concept achieves the same phase noise tolerance as the original QAM feedforward carrier recovery concept, but reduces the required hardware effort by factors of 1.5-3 depending on the order of the QAM constellation.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:16 ,  Issue: 5 )