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Journal articles on the topic 'Frequency demodulation'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Renuka, Kajur, and V. Prasad K. "Design and analysis of optimized CORDIC based GMSK system on FPGA platform." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (2020): 4679–86. https://doi.org/10.11591/ijece.v10i5.pp4679-4686.

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The gaussian minimum shift keying (GMSK) is one of the best suited digital modulation schemes in the global system for mobile communication (GSM) because of its constant envelop and spectral efficiency characteristics. Most of the conventional GMSK approaches failed to balance the digital modulation with efficient usage of spectrum. In this article, the hardware architecture of the optimized CORDIC-based GMSK system is designed, which includes GMSK Modulation with the channel and GMSK Demodulation. The modulation consists of non-return zero (NRZ) encoder, an integrator followed by Gaussian fil

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2

Zhu, Shou Zhong, Zheng Liu, and Wen Li Jiang. "Counteraction of Constant Modulus Demodulation Scheme for Mixing Space Borne AIS Signals." Applied Mechanics and Materials 340 (July 2013): 523–28. http://dx.doi.org/10.4028/www.scientific.net/amm.340.523.

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Demodulation scheme was proposed in satellite systems to received Automatic Identification Systems (AIS) signals, with the potential presence of other interfering signals. The counteraction of constant modulus demodulation scheme, referred to as CCMDS, yields a set of single short signals based on the prior information of AIS after estimating the frequency, code rate and modulation index. It demodulates the corresponding short codes according to the constant modulus characters of GMSK signals. The proposed demodulation scheme is simple and easy to implement. Simulations show the satisfying per

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3

Wang, Chun, Dong Ling Peng, and Ge Zhu. "Energy Operator Demodulation Method and Its Application in Gears Fault Diagnosis." Advanced Materials Research 403-408 (November 2011): 2972–80. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.2972.

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Base on the analysis of the localization of the demodulation methods, a new optimizing arithmetic model, the energy operator optimizing arithmetic, is put forward first. Through theoretical analysis and engineering application, this new arithmetic is compared with the classic arithmetic, Hilbert demodulating method, from the precision, sensitivity, anti-jamming, complexion and some other fields by experiments. At last, this dissertation validates that the high-frequency resonance technique based on energy operator optimizing arithmetic which combine with LabView is availability with gear fault

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Peng, Kang-Chun, and Chan-Hung Lee. "A Novel Quadrature-Tracking Demodulator for LTE-A Applications." Wireless Communications and Mobile Computing 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/8712414.

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This work develops an advanced quadrature-tracking demodulation technique for coherently demodulating the orthogonal frequency-division multiplexing (OFDM) signal of LTE-A systems. To overcome the fact that traditional coherent demodulators are extremely sensitive to the quadrature imbalance of a system, especially an OFDM system, the proposed architecture uses a novel quadrature phase-locked loop (QPLL) to track simultaneously the in phase (I-phase) and the quadrature phase (Q-phase) of the received signal. This advanced quadrature-tracking demodulator is realized using TSMC 0.18 μm CMOS tech

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Harcombe, David M., Michael G. Ruppert, Michael R. P. Ragazzon, and Andrew J. Fleming. "Lyapunov estimation for high-speed demodulation in multifrequency atomic force microscopy." Beilstein Journal of Nanotechnology 9 (February 8, 2018): 490–98. http://dx.doi.org/10.3762/bjnano.9.47.

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An important issue in the emerging field of multifrequency atomic force microscopy (MF-AFM) is the accurate and fast demodulation of the cantilever-tip deflection signal. As this signal consists of multiple frequency components and noise processes, a lock-in amplifier is typically employed for its narrowband response. However, this demodulator suffers inherent bandwidth limitations as high-frequency mixing products must be filtered out and several must be operated in parallel. Many MF-AFM methods require amplitude and phase demodulation at multiple frequencies of interest, enabling both z-axis

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Fu, Gang, Yan Jun Wu, and Yue Feng. "Research on Demodulation of Pulse Code Modulated Signal Based on Instantaneous Frequency Measurement." Advanced Materials Research 989-994 (July 2014): 3997–4000. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3997.

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According instantaneous frequency measurement theory, we propose a new PCM / FM telemetry signal demodulation method. This paper introduces the basic principles of this demodulation method and implementation process, the influence of instantaneous frequency measurement accuracy and the impact of factors on the Doppler frequency demodulation performance is proposed to improve the accuracy and instantaneous frequency measurement method demodulation performance .

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Zou, Hui Zhi. "Research on Fm Telemetry Signal Demodulation Based on Instantaneous Frequency Measurement." Applied Mechanics and Materials 602-605 (August 2014): 2225–28. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2225.

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According instantaneous frequency measurement theory, we propose a new PCM/FM telemetry signal demodulation method. This paper introduces the basic principles of this demodulation method and implementation process, the influence of instantaneous frequency measurement accuracy and the impact of factors on the Doppler frequency demodulation performance is proposed to improve the accuracy and instantaneous frequency measurement method demodulation performance. Simulation results show that this method is superior demodulation performance, strong anti-jamming capability, ease of software programmin

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Ruppert, Michael G., David M. Harcombe, Michael R. P. Ragazzon, S. O. Reza Moheimani, and Andrew J. Fleming. "A review of demodulation techniques for amplitude-modulation atomic force microscopy." Beilstein Journal of Nanotechnology 8 (July 10, 2017): 1407–26. http://dx.doi.org/10.3762/bjnano.8.142.

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In this review paper, traditional and novel demodulation methods applicable to amplitude-modulation atomic force microscopy are implemented on a widely used digital processing system. As a crucial bandwidth-limiting component in the z-axis feedback loop of an atomic force microscope, the purpose of the demodulator is to obtain estimates of amplitude and phase of the cantilever deflection signal in the presence of sensor noise or additional distinct frequency components. Specifically for modern multifrequency techniques, where higher harmonic and/or higher eigenmode contributions are present in

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9

Hou, Shumin, Ming Liang, Yi Zhang, and Chuan Li. "Vibration signal demodulation and bearing fault detection: A clustering-based segmentation method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 11 (2013): 1888–99. http://dx.doi.org/10.1177/0954406213514960.

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The resonance demodulation technique has been widely employed in vibration signal analysis. In order to construct a proper bandpass filter, the prior knowledge, i.e. the resonance frequency band of the mechanical system is required in the traditional demodulation method. However, as the collected vibration signal is often tainted by the background noise and interferences often with unknown frequency contents, it is difficult to identify the center frequency and the bandwidth of the filter. This paper introduces a clustering-based segmentation method to determine these parameters automatically.

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10

Sud, Seema. "High Order Chirp Rate Shift Keying Modulation Using the Fractional Fourier Transform." European Journal of Engineering Research and Science 2, no. 4 (2017): 1. http://dx.doi.org/10.24018/ejers.2017.2.4.314.

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In this paper, we discuss an improved demodulation scheme using the Fractional Fourier Transform (FrFT) for a modulation scheme employing chirp rate shift keying (CrSK). CrSK in conjunction with the FrFT enable very high order, e.g. more than 32-ary modulation schemes to be achievable with good bit error rate (BER) performance, even in the absence of coding, thereby overcoming limitations of traditional schemes including phase shift keying (PSK) or QAM (quadrature amplitude modulation). By using an FrFT-based demodulator, we expand our demodulation degrees of freedom from a single (e.g. freque

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Sud, Seema. "High Order Chirp Rate Shift Keying Modulation Using the Fractional Fourier Transform." European Journal of Engineering and Technology Research 2, no. 4 (2017): 1–5. http://dx.doi.org/10.24018/ejeng.2017.2.4.314.

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In this paper, we discuss an improved demodulation scheme using the Fractional Fourier Transform (FrFT) for a modulation scheme employing chirp rate shift keying (CrSK). CrSK in conjunction with the FrFT enable very high order, e.g. more than 32-ary modulation schemes to be achievable with good bit error rate (BER) performance, even in the absence of coding, thereby overcoming limitations of traditional schemes including phase shift keying (PSK) or QAM (quadrature amplitude modulation). By using an FrFT-based demodulator, we expand our demodulation degrees of freedom from a single (e.g. freque

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Weikert, O., and U. Zölzer. "A wireless MIMO CPM system with blind signal separation for incoherent demodulation." Advances in Radio Science 6 (May 26, 2008): 101–5. http://dx.doi.org/10.5194/ars-6-101-2008.

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Abstract. A multiple-input multiple-output (MIMO) wireless transmission system with continuous phase modulation (CPM) is considered. A novel MIMO CPM receiver with incoherent modulation is presented. The incoherent demodulation of CPM allows an uncomplicated handling of a frequency offset compared to coherent approaches requiring exact knowledge of the carrier frequency. Blind signal separation (BSS) is applied in the proposed MIMO CPM receiver to separate the signals without any knowledge of the MIMO channel. The BSS permits the demodulation of each separated signal by an incoherent CPM demod

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Zhang, Han, and Lijun Meng. "Research status of sensor demodulation technology of fiber grating ultrasonic signal." Journal of Physics: Conference Series 2302, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1742-6596/2302/1/012001.

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Abstract Compared with ordinary gratings, phase-shifted fiber gratings have better ultrasonic response sensitivity and higher upper response frequency. The application of phase-shifted fiber gratings in ultrasonic signal detection has gradually become a research hotspot. This paper mainly introduces the demodulation principle of tunable laser power scanning and wavelength feedback control techniques such as wavelength stabilization, frequency stabilization and laser tracking. Most of the existing demodulation techniques are only suitable for single optical channel, and the demodulation frequen

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14

Yan, Hao, Xiaoping Liao, Chenglin Li, and Chen Chen. "A Cascaded MEMS Amplitude Demodulator for Large Dynamic Range Application in RF Receiver." Micromachines 12, no. 12 (2021): 1515. http://dx.doi.org/10.3390/mi12121515.

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An amplitude demodulator with a large dynamic range, based on microelectromechanical systems (MEMS), is proposed in this paper. It is implemented as a cascade of a capacitive and a thermoelectric sensor. Two types of the transducer can improve the measurement range and enhance the overload capacity. This MEMS-based demodulation is realized by utilizing the square law relationship and the low-pass characteristic during the electromechanical and thermoelectric conversion. The fabrication of this device is compatible with the GaAs monolithic microwave integrated circuit (MMIC) process. Experiment

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15

Zhao, Jiaxin, Xinyi Zhang, Qi Wang, et al. "Software-Defined Optical Coherence Measurement of Seawater Refractive Index Variations." Sensors 25, no. 10 (2025): 3119. https://doi.org/10.3390/s25103119.

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The seawater refractive index is an important parameter in marine environments, with its variations depending on the specific environmental conditions. During practical applications, modulation parameters such as the sampling rate, bandwidth, and filters directly affect the signal-to-noise ratio (SNR) and need to be adjusted in real-time according to the characteristics of the target signal. Low-cost software-defined radio (SDR) offers significant advantages in this regard. This paper proposes an optical coherence measurement method for seawater refractive index changes based on orthogonal dem

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16

Harcombe, David M., Michael G. Ruppert, and Andrew J. Fleming. "A review of demodulation techniques for multifrequency atomic force microscopy." Beilstein Journal of Nanotechnology 11 (January 7, 2020): 76–91. http://dx.doi.org/10.3762/bjnano.11.8.

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This article compares the performance of traditional and recently proposed demodulators for multifrequency atomic force microscopy. The compared methods include the lock-in amplifier, coherent demodulator, Kalman filter, Lyapunov filter, and direct-design demodulator. Each method is implemented on a field-programmable gate array (FPGA) with a sampling rate of 1.5 MHz. The metrics for comparison include the sensitivity to other frequency components and the magnitude of demodulation artifacts for a range of demodulator bandwidths. Performance differences are demonstrated through higher harmonic

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17

Mohamed Moubark, Asraf, and Sawal Hamid Md Ali. "A Novel Sample Based Quadrature Phase Shift Keying Demodulator." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/107831.

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This paper presents a new practical QPSK receiver that uses digitized samples of incoming QPSK analog signal to determine the phase of the QPSK symbol. The proposed technique is more robust to phase noise and consumes up to 89.6% less power for signal detection in demodulation operation. On the contrary, the conventional QPSK demodulation process where it uses coherent detection technique requires the exact incoming signal frequency; thus, any variation in the frequency of the local oscillator or incoming signal will cause phase noise. A software simulation of the proposed design was successfu

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18

Fu, Gang, Jian Hua Lin, and Qian He. "Demodulating Method of Frequency Predictable Digital FM Signal." Applied Mechanics and Materials 644-650 (September 2014): 4595–98. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4595.

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This paper presents a new method for strong background noise of known frequency signal estimation method is then applied to the demodulated digital FM signal. This new method only needs to know the frequency of the demodulated carrier signal phase information without the need to complete the digital FM demodulation signal. Computer simulations show that the method has more than non-coherent demodulation noise immunity, and has a very strong ability of anti-phase fluctuations. Thus, the demodulation method has good prospects for engineering applications.

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19

Yang, Ye, Jiang Wu, Hao Wu, and Yu Wang. "Research on onboard multistage digital demultiplexer for satellite communication based on MF-TDMA system." Journal of Physics: Conference Series 2524, no. 1 (2023): 012007. http://dx.doi.org/10.1088/1742-6596/2524/1/012007.

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Abstract A new multicarrier multi-rate digital demultiplexer system structure based on MF-TDMA(Multi-Frequency Time Division Multiple Access) in a wideband satellite communication system is described. Compared with the traditional tree multicarrier demultiplexer method, the new structure uses a half-band filter instead of the quadrature mirror filter, which has three advantages: 1) It fully avoids the shortcomings of the traditional method, such as confusion distortion and amplitude distortion. 2) The computation to achieve filtering is reduced by nearly half. 3) It effectively improves the de

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20

Mayer, Kayol Soares, Candice Müller, Fernando Cesar Comparsi de Castro, and Maria Cristina Felippetto de Castro. "A New CPFSK Demodulation Approach for Software Defined Radio." Journal of Circuits, Systems and Computers 28, no. 14 (2019): 1950243. http://dx.doi.org/10.1142/s0218126619502438.

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This paper proposes a new coherent Frequency-Shift Keying (FSK) demodulation technique for software defined radio platform, based on a new Digital Phase Locked Loop (DPLL) architecture. The proposed DPLL addresses the frequency dependence on classic DPLL architectures found in the literature. In classical approaches, the loop filter constants are dependent on the frequency level of the FSK transmitted symbols. The proposed approach applies a simpler feedback loop, with a single integrator and a phase detector architecture based on the small-angle approximation [Formula: see text], which result

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21

Zhang, Ziyang, Song Ye, Shu Li, et al. "Optimal Demodulation Algorithm of Spatially Modulated Full-Polarization Imaging System." Photogrammetric Engineering & Remote Sensing 86, no. 12 (2020): 761–66. http://dx.doi.org/10.14358/pers.86.12.761.

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Spatially modulated full-polarization imaging systems can obtain full Stokes parameter information by single imaging, with strong characteristics of real-time execution and stability. Since all the polarization information is modulated into an interferogram, demodulation becomes an essential step. As the resolution of the obtained image continuously increases, the data to be calculated also increase. Therefore, a higher speed for the demodulation process is requisite. This article proposes a local filtering method and bypasses the frequency centralization method in the frequency domain to impr

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22

Li, Qinglong, Yong Xu, Qiao Li, Kun Peng, and Xian Zhang. "A Demodulation Circuit For Analog Front End Of Passive Tag Chip." Journal of Physics: Conference Series 2065, no. 1 (2021): 012007. http://dx.doi.org/10.1088/1742-6596/2065/1/012007.

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Abstract The demodulation circuit designed in this paper is suitable for the analog front end of passive UHF RFID tag chip, which can handle ASK signals with large changes in amplitude, modulation depth and signal frequency. Its performance meets the requirements of standards ISO/IEC 18000-6C and GB/T 29768-2013. Envelope detection circuit and limiter circuit are simple in structure and do not consume power. The comparison reference voltage is taken according to the average value of the envelope high and low levels, and is less affected by the dynamic changes of the input signal. Changing the

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23

Platt, Ronald S., Eric A. Hajduk, Manuel Hulliger, and Paul A. Easton. "A modified Bessel filter for amplitude demodulation of respiratory electromyograms." Journal of Applied Physiology 84, no. 1 (1998): 378–88. http://dx.doi.org/10.1152/jappl.1998.84.1.378.

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Platt, Ronald S., Eric A. Hajduk, Manuel Hulliger, and Paul A. Easton. A modified Bessel filter for amplitude demodulation of respiratory electromyograms. J. Appl. Physiol. 84(1): 378–388, 1998.—We studied a device that is commonly used for amplitude demodulation of respiratory muscle electromyograms (EMG). This device contains a rectifier and a low-pass filter called a modified third-order Paynter filter. We characterized this filter and found that it has good transient characteristics that suit its task as an EMG demodulator, but it has poor high-frequency attenuation that passes interfering

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Winholtz, William S., and Lorraine Olson Ramig. "Vocal Tremor Analysis With the Vocal Demodulator." Journal of Speech, Language, and Hearing Research 35, no. 3 (1992): 562–73. http://dx.doi.org/10.1044/jshr.3503.562.

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Acoustic analysis of vocal tremor has the potential to make significant quantitative and diagnostic contributions to the study of vocal disorders. This paper presents a new device for analysis of vocal tremor. The Vocal Demodulator produces amplitude- and frequency-demodulated outputs and measures the frequency and level (percent) of low-frequency tremor components in sustained phonation. A standard microphone is used to transduce the voice signal for input to the demodulator. The input fundamental frequency (F o ) range is 70–1200 Hz, and frequency response of the amplitude and frequency demo

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Xing, Guang Zhen, Ping Yang, and Long Biao He. "Comparison of Hydrophone Calibration by Reciprocity and Heterodyne Interferometer in the Frequency Range 500 kHz to 15 MHz." Applied Mechanics and Materials 239-240 (December 2012): 10–15. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.10.

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This paper presents a comparison of high-frequency hydrophone calibration by a heterodyne interferometer and two-transducer reciprocity method respectively. For the calibration using the heterodyne interferometer, a vertical arrangement is applied to avoid the acousto-optical interaction which is a major uncertainty source in previous studies. For the demodulation of the acoustic displacement, a PC-based digital demodulation using arctangent algorithm is applied which has overcome the drawback of analog demodulation and achieved a higher demodulation accuracy. The demodulation is independent o

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Wang, Shuaipeng, Haichao Huang, Ying Yang, et al. "A Modulation Method for Tunnel Magnetoresistance Current Sensors Noise Suppression." Micromachines 15, no. 3 (2024): 360. http://dx.doi.org/10.3390/mi15030360.

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To mitigate the impact of low-frequency noise from the tunnel magnetoresistance (TMR) current sensor and ambient stray magnetic fields on weak current detection accuracy, we propose a high-resolution modulation-demodulation test method. This method modulates and demodulates the measurement signal, shifting low-frequency noise to the high-frequency band for effective filtering, thereby isolating the target signal from the noise. In this study, we developed a Simulink model for the TMR current sensor modulation-demodulation test method. Practical time-domain and frequency-domain tests of the dev

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Cai, Lin Jun, Zheng Ying Li, Zhi Hao Tang, Wei Meng, and Quan Liu. "A Novel Peak-Seek Algorithm Used in FBG Sensor Demodulation System for Vibration Monitoring." Applied Mechanics and Materials 160 (March 2012): 135–39. http://dx.doi.org/10.4028/www.scientific.net/amm.160.135.

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The FBG sensor technologies used for real-time monitoring of the mechanical vibration have attracted more and more concerns from both academic and industrial domains. In practical applications, the vibration frequency of the equipments generally reach up to a few hundred to several thousand Hz, however, the existing FBG demodulator is incompetent to meet the actual requirements of vibration monitoring in terms of demodulation speed and algorithm structures. To solve this problem while achieving a higher accuracy at a relatively lower computation cost, a novel adaptive semi-peak-seek algorithm

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Chen, Hanyu, Shenyang Li, Dun Wang, et al. "Research on carrier frequency tracking and message demodulation techniques for GNSS signals." Journal of Physics: Conference Series 2991, no. 1 (2025): 012013. https://doi.org/10.1088/1742-6596/2991/1/012013.

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Abstract Carrier frequency tracking is suitable for application scenarios where global navigation satellite system (GNSS) signals are weak and exhibit large dynamic changes. However, when using a frequency-locked loop (FLL) to track the carrier of a GNSS signal, it is difficult to apply the conventional coherent demodulation method of binary phase-shift keying-modulated messages because the carrier phase is not locked, which necessitates the use of differential demodulation. This study aims to explore the impact of different FLL combination designs on the performance of differential demodulati

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Liu, Mingxuan, Yiping Shen, and Yuandong Xu. "A Resonance-Identification-Guided Autogram for the Fault Diagnosis of Rolling Element Bearings." Machines 13, no. 3 (2025): 169. https://doi.org/10.3390/machines13030169.

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Rolling element bearings are key components for reducing friction and supporting rotors. Harsh working conditions contribute to the wear of bearings and consequent breakdown of machines, which leads to economic losses and even catastrophic accidents. Faulty impulses from bearings can excite resonance behavior in a system and produce modulation phenomena. Fault characteristics in modulated signals can be extracted using demodulation analysis methods, significantly improving the reliability and effectiveness of the fault diagnosis of rolling bearings. Optimal demodulation frequency band selectio

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Liu, Xiao Peng, Yan Han, Dong Dong Zhong, and Ming Yu Wang. "The Design and Implement of a Receiver for FSK Signal." Applied Mechanics and Materials 190-191 (July 2012): 739–41. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.739.

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A novel frequency shift keying (FSK) receiver is presented, including receiving antennas, a low noise amplifier (LNA), band-pass filters (BPF) and a novel all-digital 2-level FSK demodulator. The Matlab simulation results of the all-digital FSK demodulator show that it can improve bit error ratio (BER) performance compared with pseudo-coherent FSK demodulation (PCFSK). The novel FSK demodulator defined using Verilog HDL is easy to be implemented on Field Programmable Gate Array (FPGA) and in CMOS integrated circuit. The whole FSK receiver designed and implemented on a PCB board can receive FSK

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Steiskal, A. B., S. O. Kovtun, V. V. Voitko, and A. P. Ogarok. "Demodulation of Energy Hidden Linear-Frequency-Modulated Signals." Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 86 (September 30, 2021): 45–51. https://doi.org/10.20535/radap.2021.86.45-51.

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Statement of the problem in generalRecently, there has been a tendency to increase the number of telecommunications systems that use spread spectrum signals: binary phase-shift keying (BPSK) signals with linear frequency modulation, chirp signals and their combinations. Due to this, the anti-jamming of telecommunication systems is increased, the stealth mode of their functioning is provided.This tendency raises issues in the field of radio monitoring systems implementation. The use of spread-spectrum signals in telecommunication systems significantly reduces the spectral height of radio emissi

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Vos, Hendrik J., David E. Goertz, and Nico de Jong. "Self-demodulation of high-frequency ultrasound." Journal of the Acoustical Society of America 127, no. 3 (2010): 1208–17. http://dx.doi.org/10.1121/1.3298436.

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Wu, Yan Jun, Gang Fu, and Gang Cheng. "Pulse Coding Soft FM Telemetry Signal Demodulation." Advanced Materials Research 989-994 (July 2014): 3952–55. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3952.

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The traditional method of demodulation for PCM/FM telemetry demodulation threshold is higher and the computation of the larger problem, research an orthogonal baseband after rotation, Symbol Detection (Multi - Symbol Detection, MSD) technology: the first frequency under the intermediate frequency digital telemetry signals processing, single sign on orthogonal baseband signal correlation matching, and then apply compound spinning technology to meet at the same time for multiple element symbols at the same time Detection, the purpose of the final design step length synchronization method with de

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Han, Chenhaolei, Yuan Ju, Zongxu Zhao, Yuni He, and Zhan Tang. "A Novel Demodulation Algorithm Based on the Spatial-Domain Carrier Frequency Fringes Method." Photonics 11, no. 12 (2024): 1125. http://dx.doi.org/10.3390/photonics11121125.

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Structured illumination microscopy (SIM) has attracted much attention from researchers due to its high accuracy, high efficiency, and strong adaptability. In SIM, demodulation is a key point to recovering three-dimensional topography, which directly affects the accuracy and validity of measurement. The traditional demodulation methods are the phase-shift method and Fourier transform method. The phase-shift method has a high demodulation accuracy, but its time consumption is too long. The Fourier transform method has high efficiency, but its demodulation accuracy is lower due to the loss of hig

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Yang, Zhang Cheng, and Xiang Lin Wang. "Analysis on Anti-Noise Performance of Frequency Modulation System Based on MATLAB Simulation." Applied Mechanics and Materials 543-547 (March 2014): 2426–30. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2426.

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The popularity of internet technology has brought the change very big to the life and production of modern humans, the current Internet technology application has penetrated into people in every aspect of modern life, has become an indispensable part of people's life. Firstly, system model of the current network communication to dissect, analyzes the architecture of network communication system, modulation and demodulation principle is applied to design the FM communication signal modulation system network communication in the Internet technology, the non coherent demodulation method to build

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Kudinova, T. V., G. A. Osipov, and F. A. Nanay. "Digital demodulators for analog signals: comparative analysis and simulation." Journal of Physics: Conference Series 2094, no. 2 (2021): 022048. http://dx.doi.org/10.1088/1742-6596/2094/2/022048.

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Abstract The paper examines digital demodulators for two commonly used techniques of modulating analog signals: amplitude modulation (AM) and frequency modulation (FM). The described demodulators can be used to perform the radio monitoring of narrowband signal ranges including FM broadcasting stations as well as license-free CB, LPD, PMR bands. The demodulators considered in this work are intended for programmable devices with limited memory and computing resources, for example, for STM32F407 microcontrollers and similar ones. The paper presents the analysis and simulation of demodulators for

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Jang, In-Gyu, Sung-Hyun Lee, and Yong-Hwa Park. "A Parallel-Phase Demodulation-Based Distance-Measurement Method Using Dual-Frequency Modulation." Applied Sciences 10, no. 1 (2019): 293. http://dx.doi.org/10.3390/app10010293.

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Time-of-flight (ToF) measurement technology based on the amplitude-modulated continuous-wave (AMCW) model has emerged as a state-of-the-art distance-measurement method for various engineering applications. However, many of the ToF cameras employing the AMCW process phase demodulation sequentially, which requires time latency for a single distance measurement. This can result in significant distance errors, especially in non-static environments (e.g., robots and vehicles) such as those containing objects moving relatively to the sensors. To reduce the measurement time required for a distance me

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Fu, Meng, Stan Skafidas, and Iven Mareels. "A Novel Delay-Based GFSK Demodulator in 65 nm CMOS for Low Power Biomedical Applications." International Journal of Interdisciplinary Telecommunications and Networking 10, no. 3 (2018): 21–32. http://dx.doi.org/10.4018/ijitn.2018070103.

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This article describes how, in recent years, with the development of microelectronics, implantable electronic devices have been playing a significant role in modem medicine. Examples of such electronic implant devices are, for instance, retinal prosthesis and brain implants. It brings great challenges in low power radio frequency (RF) and analog designs. This article presents a low power Gaussian frequency shift keying (GFSK) demodulator designed for Medical Implant Communications Service (MICS) band Receiver. This demodulator utilizes a novel structure that a wide IF range can be handled and

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Kajur, Renuka, and K. V. Prasad. "Design and analysis of optimized CORDIC based GMSK system on FPGA platform." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (2020): 4679. http://dx.doi.org/10.11591/ijece.v10i5.pp4679-4686.

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The Gaussian minimum shift keying (GMSK) is one of the best suited digital modulation schemes in the global system for mobile communication (GSM) because of its constant envelop and spectral efficiency characteristics. Most of the conventional GMSK approaches failed to balance the digital modulation with efficient usage of spectrum. In this article, the hardware architecture of the optimized CORDIC-based GMSK system is designed, which includes GMSK Modulation with the channel and GMSK Demodulation. The modulation consists of non-return zero (NRZ) encoder, an integrator followed by Gaussian fil

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Reisenfeld, S., and A. Kumar. "Frequency error estimation for frequency comb multiple access demodulation." Electronics Letters 30, no. 9 (1994): 685–86. http://dx.doi.org/10.1049/el:19940492.

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Sotnik, О., S. Marchenko, V. Litvinenko, and О. Syanov. "RADIO COMMUNICATION CHANNEL WITH FREQUENCY MODULATED SIGNAL BASED ON PROGRAMMABLE LOGICAL INTEGRATED CIRCUIT." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. 38 (2021): 75–83. http://dx.doi.org/10.31319/2519-2884.38.2021.9.

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This paper presents the results of an experimental study of a radio communication channel (RF) with a frequency-modulated signal based on a programmable logic integrated circuit (FPGA). The work highlights the features of hardware and software implementation of algorithms for the synthesis of frequency-modulated signal and demodulation of this signal using FPGA in real time. The software part is made in the development environment of ISE WebPack 14.7 in Verilog language with the ability to visualize the results of GTKWave. Hardware implementation is performed on the basis of FPGA (Spartan-6) u

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Meng, Li Jun, Yue Gang Tan, and Zu De Zhou. "Research on Demodulation System for Fiber Bragg Grating Sensor Based on Tunable Laser Light." Advanced Materials Research 341-342 (September 2011): 838–42. http://dx.doi.org/10.4028/www.scientific.net/amr.341-342.838.

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In order to measure the signals greater than kHz such as vibration, high frequency strain and ultrasonic wave, a high-speed demodulation system for fiber Bragg grating（FBG）sensor based on tunable laser light was established. The measuring principle of the demodulation system was presented. The output curve and the wavelength measurement sensitivity were given by theoretical deduction. Then the 41434.71028 [Hz] vibration signal of ultrasonic cleaner was measured using this system. The system was compactly built with high demodulation speed and S/N(signal to noise ratio), meeting the special req

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Rodriguez-Marmolejo, Ulises H., Miguel Mora-Gonzalez, Jesus Muñoz-Maciel, and Tania A. Ramirez-delreal. "FSD-HSO Optimization Algorithm for Closed Fringes Interferogram Demodulation." Mathematical Problems in Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/1576735.

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Due to the physical nature of the interference phenomenon, extracting the phase of an interferogram is a known sinusoidal modulation problem. In order to solve this problem, a new hybrid mathematical optimization model for phase extraction is established. The combination of frequency guide sequential demodulation and harmony search optimization algorithms is used for demodulating closed fringes patterns in order to find the phase of interferogram applications. The proposed algorithm is tested in four sets of different synthetic interferograms, finding a range of average relative error in phase

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Daldal, Nihat, Zeynel Abidin Sezer, Majid Nour, Adi Alhudhaif, and Kemal Polat. "A New Generation Communication System Based on Deep Learning Methods for the Process of Modulation and Demodulation from the Modulated Images." Mathematical Problems in Engineering 2022 (May 28, 2022): 1–13. http://dx.doi.org/10.1155/2022/9555598.

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Demodulating the modulated signals used in digital communication on the receiver side is necessary in terms of communication. The currently used systems are systems with a variety of hardware. These systems are used separately for each type of communication signal. A single algorithm facilitates the classification and subsequent demodulation of signals without needing hardware instead of extra hardware cost and complex systems. This study, which aims to make modulation classification by using images of signals, provides this convenience. In this study, a classification and demodulation process

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Zhu, Dong Xu, Gang Fu, and Yue Feng. "Study of PCM/FM Telemetry Sequence Soft Demodulation." Advanced Materials Research 989-994 (July 2014): 3922–25. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3922.

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In order to improve the performance of PCM/FM signal demodulation system, this paper studies a kind of Symbol Detection more (Multi-Symbol Detection, MSD) technology. First for PCM/FM in hardware demodulation, a series of problems in the introduction of MSD software demodulation method; Then the MSD demodulation under low SNR synchronous implementation; The algorithm simulation, the results show that the bit error rate of 10-4, detection performance than traditional non-coherent frequency discrimination algorithm can improve the nearly 3 dB, the performance is very ideal.

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Tao, Min, Gang Fu, and Guang Zhi Wu. "The Application of a New Demodulation Technology in the Telemetry System." Advanced Materials Research 989-994 (July 2014): 4191–94. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.4191.

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This paper presents a new PCM / FSK digital signal demodulation method. By using an adaptive least mean square error algorithm consider wave single frequency, the tracking signal, analyzes the envelope of the output signal, demodulate the PCM / FSK signal. This paper introduces the basic principles of this demodulation method and implementation process, analyzes the factors that affect the demodulation performance. Simulation results show that this method is superior to the differential demodulation performance, strong anti-jamming capability, ease of software programming and DSP devices achie

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Luo, Songrong, Junsheng Cheng, and Jianping Fu. "Application of Self-Adaptive Wavelet Ridge Demodulation Method Based on LCD to Incipient Fault Diagnosis." Shock and Vibration 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/735853.

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When a local defect occurs in gearbox, the vibration signals present as the form of multicomponent amplitude modulation and frequency modulation (AM-FM). Demodulation analysis is an effective way for this kind of signal. A self-adaptive wavelet ridge demodulation method based on LCD is proposed in this paper. Firstly, multicomponent AM-FM signal is decomposed into series of intrinsic scale components (ISCs) and the special intrinsic scale component is selected in order to decrease the lower frequency background noise. Secondly, the genetic algorithm is employed to optimize wavelet parameters a

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Zhang, Xiaolin, Hongjie Mao, and Wenyan Tang. "Demodulation Technique Based on Laser Interference for Weak Photo-Acoustic Signals on Water Surface." Applied Sciences 8, no. 12 (2018): 2423. http://dx.doi.org/10.3390/app8122423.

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To detect underwater sound-generating targets, a water surface acoustic wave laser interference and signal demodulation technique is proposed in this paper. The underlying principle of this technique involves casting a laser beam onto the water surface disturbed by an underwater acoustic source and creating interference between lights reflected by the surface and reference lights. A data acquisition and processing system was employed to obtain water surface acoustic wave information from the interference signals by means of demodulation, thus allowing detection of the underwater target. For th

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Luo, Dong Song, and Zheng Fan. "Wavelet Algorithm in Rotating Machinery Fault Feature Extraction." Advanced Materials Research 823 (October 2013): 451–55. http://dx.doi.org/10.4028/www.scientific.net/amr.823.451.

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A method of Rotating Machinery fault feature extraction based on wavelet transform and Hilbert demodulation is been studied. On the basis of rotating machinery fault mechanism and spectral characteristics, wavelet transform is used to be decompose the vibration acceleration signals of bearing faults into different frequency bands, Which is then used to achieve accurate fault information by Hilbert demodulation. The result shows the method can effectively improve the frequency resolution and realize accurate extraction of fault feature, and it has certain practical value for industrial producti

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Hong, Yingping, Pengyu Jia, Xihao Guan, et al. "Wireless Passive High-Temperature Sensor Readout System for Rotational-Speed Measurement." Journal of Sensors 2021 (November 2, 2021): 1–10. http://dx.doi.org/10.1155/2021/6656527.

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Rotational-speed measurement in harsh environments is an important topic. However, the high rotation results in rapid frequency variations in the signals of a sensor and changes in physical properties under extreme thermal circumstances cause significant difficulties in reading signals. To address this problem, we adopt wireless passive measurement methods to design a special characteristic signal circuit module that achieves precise measurement of rotational speed at high temperatures. The sensor and the readout system include a variable frequency source, a readout antenna, and a radio freque

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