Combined Symbol-Pattern-Dependent Adaptive Equalization and Sequence Detection for Coherent Optical Fiber Communications

Cai, Yi; Chien, Hung‐Chang; Xiang, Meng; Wang, Wei; Fan, Li; Hu, Zihe; Gao, Mingyi; Jiang, Chenxu; Tian, Zhongxing; Xu, Hansheng; Zhang, Kaisheng; Shen, Jiaojie; Huang, Ji Ting

doi:10.1109/jlt.2021.3131121

Cited by 11 publications

(2 citation statements)

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“…To significantly enhance lowlatency communication for future missions and minimize ground station location constraints, optical communication relay node based on inter-satellite coherent detection has been widely studied and experimentally verified its technical feasibility. 5,6 Compared with terrestrial optical fiber communication, 7 inter-satellite coherent laser communication has a large difference in channel impairments. Inter-satellite links undergo strong Doppler effects due to the relative motion between transmitter and receiver.…”

Section: Introductionmentioning

confidence: 99%

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Hardware-efficient adaptive equalizer for inter-satellite coherent laser communication systems

Zhao,

Ju,

Liu

et al. 2024

Opt. Eng.

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We present an inter-satellite coherent laser communication prototype system, highlighting a low complexity receiver with a simplified two independent real-valued (TIR) equalizer suitable for space laser communication scenarios. An extensive comparison of classical single complex-valued equalizer, 2 × 2 real-valued equalizer, TIR, and two dependent real-valued (TDR) equalizer is presented on the basis of equalization principles, algorithm performance, and computational complexity. The analysis results show that TIR equalizer has the advantages of low logic resource consumption in implemented on field programmable gate array (FPGA) and zero sensitivity penalty to combat I/Q gain imbalance and I/Q skew caused by device aging. The constant modulus algorithm-based TIR equalizer fits binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or higher-order QAM modulation format, while the traditional complex-valued equalizer needs to customize the tap coefficient updating algorithm for different modulation formats. In addition, to show the feasibility of the proposed TIR equalizer-based coherent laser receiver as a promising candidate for forthcoming inter-satellite networks, we demonstrate single polarization (SP) on-line 2.5 GBaud data rate, QPSK and BPSK coherent transmissions using an FPGA-based transmitter and receiver prototype. Thanks to our proposed equalizer, the number of hardened multipliers is reduced by 47%, while no receiver sensitivity penalty is observed both in numerical simulation and in real-time FPGA experiment.

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Section: Introductionmentioning

confidence: 99%

“…Compared with terrestrial optical fiber communication, 7 inter-satellite coherent laser communication has a large difference in channel impairments. Inter-satellite links undergo strong Doppler effects due to the relative motion between transmitter and receiver 8 .…”

Section: Introductionmentioning

confidence: 99%