In this paper. a blind phase noise estimation method for a coherent optical orthogonal frequency-division multiplexing (CO-OFDM) system is considered. Based on the subspace approach. a simple and robust method is proposed to adaptively estimate and track phase noise in CO-OFDM systems. https://www.getpureroutine.com/limited-deal-swisse-ultiboost-high-strength-magnesium-powder-berry-180g-supply-top-savings/