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IEEE

Effect of noise on constellation diagram of 100 Gbps DP-QPSK systems under influence of different digital filters

Abstract: In this paper a DP-QPSK modulation scheme has been used at 100 Gbps for the propagation length 500 km. To mitigate effects of Chromatic dispersion (CD) and Polarization mode dispersion (PMD) ...
IEEE

FPGA implementation of an all-digital T/2-spaced QPSK receiver with Farrow interpolation timing synchronizer and recursive Costas loop

Abstract: This paper describes a FPGA implementation of an all-digital QPSK receiver. The non-data-aided early-late delay (NDA-ELD) synchronization scheme based on T/2-Spaced Farrow Interpolation is ...