Blind ML Estimation of Timing Offset and Carrier Phase for M-APSK Modulated FSO Systems

This paper presents a blind maximum likelihood (ML) approach for joint estimation of symbol timing offset (STO) and common phase error (CPE) in coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems, applicable to both fiber-optic and free space optical (FSO) communications. B...

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Veröffentlicht in:IEEE photonics technology letters 2024-12, p.1-1
Hauptverfasser: Du, Xinwei, Yu, Keying, Wang, Qian, Kam, Pooi-Yuen
Format: Artikel
Sprache:eng
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Zusammenfassung:This paper presents a blind maximum likelihood (ML) approach for joint estimation of symbol timing offset (STO) and common phase error (CPE) in coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems, applicable to both fiber-optic and free space optical (FSO) communications. By utilizing the phase information from received spectrum data, we derive closed-form maximum likelihood (ML) expressions for STO and CPE estimates. Simulation results show that the proposed ML approach achieves mean squared error (MSE) close to the Cramér-Rao lower bound (CRLB), demonstrating superior robustness to noise and laser linewidths.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2024.3523478