Nonlinear distortions

In this study, we propose an optical back propagation (OBP) approach for compensation of the nonlinear and dispersion distortions in direct-detection optical OFDM system. The proposed OBP using split-step Fourier method is implemented at transmitter that is suitable for high-rate OFDM-based LR-PONs applications.

10p tamynhan6 14-09-2020 13 2   Download

Evaluating nonlinear HPA models regarding to problem of simulating intermodulation products (IMP). Proposing the polysine model for precise simulation of IMPs, especially for signals with complex structures. Proposing the use of predistortion schemes for MIMO-STBC systems based on thorough analyses of the nonlinear HPA effects on these systems with transmit/receive filters introduced in the model.

14p gaocaolon6 30-07-2020 36 1   Download

Study counter measures to limit the adverse impacts of nonlinear distortions in MIMO-STBC systems using predistortion at the transmitter; propose phase estimation and compensation schemes that overcome the adverse impacts of nonlinear distortions at the receiver.

158p gaocaolon6 30-07-2020 25 3   Download

The main question studied in this article may be viewed as a nonlinear analogue of Dvoretzky’s theorem in Banach space theory or as part of Ramsey theory in combinatorics. Given a finite metric space on n points, we seek its subspace of largest cardinality which can be embedded with a given distortion in Hilbert space. We provide nearly tight upper and lower bounds on the cardinality of this subspace in terms of n and the desired distortion. Our main theorem states that for any 0, every n point metric space contains a subset of size at least n1−...

68p noel_noel 17-01-2013 37 5   Download