Abstract
In this paper, a new precoder for a coherent optical filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) system is proposed. The precoder is designed based on an iterative polynomial eigenvalue decomposition (PEVD) algorithm to jointly mitigate the inter-symbol interference (ISI) and inter-carrier interference (ICI). The PEVD algorithm is used to decompose a polynomial channel matrix into polynomial eigenvectors and eigenvalues matrices, then a precoder is designed based on the decomposed matrices. The precoder acts as a filter applied to each subcarrier and to its adjacent subcarriers. In addition, a new adaptive optimum energy algorithm is proposed to truncate the insignificant precoder filter coefficients produced by the PEVD algorithm and consequently reduce the computational complexity. A mathematical model and algorithm for implementing the precoder are also presented. Robustness of the proposed precoder has been analyzed and compared to existing precoder in optical channel with different dispersion effects. Numerical results demonstrate that the new precoder significantly outperforms the existing precoder in terms of error vector magnitude (EVM), bit error rate (BER), Frobenius norm of the error matrix, and computational complexity.
Highlights
The Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an emerging waveform, which applies filter banks to the multicarrier signal and eliminates the need for cyclic prefix (CP) used in the popular orthogonal frequency division multiplexing (OFDM) system
The precoder is designed based on an iterative polynomial eigenvalue decomposition (PEVD) algorithm to jointly mitigate the inter-symbol interference and inter-carrier interference
The results demonstrate that the proposed system has better performance and tolerance to chromatic dispersion, while the performance of the conventional precoder is much worse especially with higher chromatic dispersion in the fiber
Summary
The Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an emerging waveform, which applies filter banks to the multicarrier signal and eliminates the need for cyclic prefix (CP) used in the popular orthogonal frequency division multiplexing (OFDM) system. We propose a new precoder channel matrix and apply it to optical communication systems. In [14], truncation methods for paraHermitian polynomial matrix had been evaluated for each iteration of the SBR2 algorithm and after convergence. This technique is based on discarding the coefficients with the smallest Frobenius norm.
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