Moving-Window DFT Based Frequency-Locked Loop for FM Demodulation

Singh, Ksh. Milan; Sumathi, P.

doi:10.1109/lcomm.2016.2537342

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…The main process of incoherent demodulation method is the construction of discriminator. In [5], Singh et al proposed a frequency locked loop based on the moving window discrete Fourier Transform. Bakar et al developed a phase locked loop system with active proportional integral filter for FM demodulation applications in [6].…”

Section: Introductionmentioning

confidence: 99%

Deep Learning-Based FM Demodulation in Complex Electromagnetic Environment

Zheng,

Pei,

Chen

et al. 2024

IEEE Open J. Commun. Soc.

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In recent years, deep learning has been applied widely in the field of communication. In this paper, a deep learning-based frequency modulation (FM) demodulation method is proposed for FM signal demodulation in complex electromagnetic environment. The received in-phase and quadrature (IQ) signals are fed into a designed model to recover the source signal. We perform experiments with random, voice and broadcasting signals under noise, multipath fading and single tone jamming scenarios. The results demonstrate that the proposed method outperforms the traditional method in terms of demodulation performance across all scenarios. Especially in the case of multipath fading and single tone jamming, our proposed method exhibits significant performance improvements over traditional demodulation. We further propose to use downsampling to reduce the computational complexity of DeepDeFM. The results indicate that by selecting a proper downsampling factor, it is possible to significantly reduce time complexity while maintaining high sound quality with minimal attenuation.

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Section: Introductionmentioning

confidence: 99%

Deep Learning-Based FM Demodulation in Complex Electromagnetic Environment

Zheng,

Pei,

Chen

et al. 2024

IEEE Open J. Commun. Soc.

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“…The estimation of phase, frequency, and magnitude of the grid voltage is indispensable for the control of grid-tied power converters. Both phase-locked loops (PLLs) [3]- [5] and frequency-locked loops (FLLs) [6]- [17] are applicable to such applications.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to PLLs, FLLs usually use the estimated frequency as a feedback variable. Growing interest has been directed to FLLs as another breed of grid synchronization techniques, which include notch filter-based FLL [6]- [11], limit cycle oscillator-based FLL [12], [13], linear Kalman filter-based FLL [14], consecutive sample-based FLL [15], moving window filter-based FLL [16], moving-window discrete Fourier transform-based FLL [17], etc. Since notch filter-based FLL possesses low complexity and good harmonic suppression capability [6], [7], it has attracted increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Reinvestigation of Single-Phase FLLs

Geng

Yang

2019

IEEE Access

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Besides well-known phase-locked loops, frequency-locked loops (FLLs) are applicable to grid synchronization for grid-tied power converters. The models, principles, and algorithm structures of existing notch filter-based single-phase FLLs are often described with different theories in previous studies. Consequently, a theoretically unified understanding and further advancements of such type of FLLs are restricted. This paper reinvestigates notch filter-based single-phase FLLs and develops a generalized design framework for such types of FLLs. The model derivations of the FLLs are made uniformly via the Popov's model reference adaptive control theory, in order to achieve the theoretically unified understanding. Three major contributions are received in this paper. First, a family of FLLs is derived, and existing seemingly different FLL designs are accordingly developed into a family of homologous FLLs. Second, the performance differences between the FLLs in the whole family are evaluated and compared quantitatively from the algorithm structure point of view, in terms of stability, convergence speed, and harmonic suppression capability. Finally, an enhanced single-phase FLL (named the 1φ-EFLL) is recommended by the family of the homologous FLLs. The designs and the performance evaluations are verified by both simulations and experiments. INDEX TERMS Frequency-locked loop (FLL), grid synchronization, model reference adaptive control (MRAC), phase-locked loop (PLL), power converter control, second-order generalized integrator (SOGI).

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