title: Carrier phase estimation for optically coherent QPSK based on Wiener-optimal and adaptive Multi-Symbol Delay Detection (MSDD).
abstract: The MSDD carrier phase estimation technique is derived here for optically coherent QPSK transmission, introducing the principle of operation while providing intuitive insight in terms of a multi-symbol extension of naïve delay-detection. We derive here for the first time Wiener-optimized and LMS-adapted versions of MSDD, introduce simplified hardware realizations, and evaluate complexity and numerical performance tradeoffs of this highly robust and low-complexity carrier phase recovery method. A multiplier-free carrier phase recovery version of the MSDD provides nearly optimal performance for linewidths up to ~0.5 MHz, whereas for wider linewidths, the Wiener or LMS versions provide optimal performance at about 9 taps, using 1 or 2 complex multipliers per tap.
authors.affiliation: EE Dept., Technion, Israel Institute of Technology, Technion City, Haifa 32000, Israel.
authors.forename: Netta
authors.initials: N
authors.lastname: Sigron
authors.forename: Igor
authors.initials: I
authors.lastname: Tselniker
authors.forename: Moshe
authors.initials: M
authors.lastname: Nazarathy
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications