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Journal articles on the topic 'Carrier signals'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Chen, Xiaofei, Xiaochun Lu, Xue Wang, Jing Ke, and Xia Guo. "Constant Envelope Multiplexing of Multi-Carrier DSSS Signals Considering Sub-Carrier Frequency Constraint." Electronics 10, no. 2 (2021): 211. http://dx.doi.org/10.3390/electronics10020211.

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With the development of global navigation satellite systems (GNSS), multiple signals modulated on different sub-carriers are needed to provide various services and to ensure compatibility with previous signals. As an effective method to provide diversified signals without introducing the nonlinear distortion of High Power Amplifier (HPA), the multi-carrier constant envelope multiplexing is widely used in satellite navigation systems. However, the previous method does not consider the influence of sub-carrier frequency constraint on the multiplexing signal, which may lead to signal power leakag

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2

Huang, Hao, Jiao Wang, and Jianqing Li. "FFSCN: Frame Fusion Spectrum Center Net for Carrier Signal Detection." Electronics 11, no. 20 (2022): 3349. http://dx.doi.org/10.3390/electronics11203349.

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Carrier signal detection is a complicated and essential task in many domains because it demands a quick response to the existence of several carriers in the wideband, while also precisely predicting each carrier signal’s frequency centers and bandwidths, including single-carrier and multi-carrier modulation signals. Multi-carrier modulation signals, such as FSK and OFDM, could be incorrectly recognized as several single-carrier signals by using the spectrum center net (SCN) or FCN-based method. This paper designed a deep convolutional neural network (CNN) framework for multi-carrier signal det

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Vasyl, Semenov, Omelchenko Pavel, and Kruhlyk Oleh. "Method for the Detection of Mixed QPSK Signals Based on the Calculation of Fourth-Order Cumulants." Signal & Image Processing: An International Journal (SIPIJ) 10, no. 3 (2019): 11–20. https://doi.org/10.5281/zenodo.3340373.

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In this paper we propose the method for the detection of Carrier-in-Carrier signals using QPSK modulations. The method is based on the calculation of fourth-order cumulants. In accordance with the methodology based on the Receiver Operating Characteristic (ROC) curve, a threshold value for the decision rule is established. It was found that the proposed method provides the correct detection of the sum of QPSK signals for a wide range of signal-to-noise ratios and also for the different bandwidths of mixed signals. The obtained results indicate the high efficiency of the proposed detection meth

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4

Kim, Hongdeuk, and Seokho Yoon. "Local Signal Design for Binary Offset Carrier Signals." Journal of Korea Information and Communications Society 38A, no. 10 (2013): 845–49. http://dx.doi.org/10.7840/kics.2013.38a.10.845.

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5

Guo, Yao, Yongnan Rao, Xue Wang, Decai Zou, Huihui Shi, and Ning Ji. "Carrier Characteristic Bias Estimation between GNSS Signals and Its Calibration in High-Precision Joint Positioning." Remote Sensing 15, no. 4 (2023): 1051. http://dx.doi.org/10.3390/rs15041051.

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A distinctive feature of modern Global Navigation Satellite System (GNSS) signals is that they transmit multiple signal components at the same carrier frequencies. The idea of joints across the signal channels from the same carrier frequency and even across different frequencies has been presented in many studies for tracking purposes. Carrier joint tracking is required on the premise that the frequency and phase relationship between signals are nominal values, and the bias of carrier characteristics between signals is drowned in noise as the signal reaches the ground, which requires high-gain

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6

Bai, Jiang Ling, Li Bin Zhong, Wen Hai Xu, and Jian Lin. "Research on Optical Signal Carrier Transmission Technology." Advanced Materials Research 1022 (August 2014): 193–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.193.

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This paper studies the single-sideband RF signals in the optical carrier side than the problem. RF signals modulated optical carrier OSSB + C modulation index is usually small, leading edge modulated carrier radio frequency signal generated by the optical carrier ratio is not ideal. A design scheme based on three-arm and four-arm MZM MZM optimized optical carrier single sideband radio frequency signal containing the edge ratio. By adjusting the DC bias voltage of the modulator can control the carrier side than the light signal. For any modulation index, are able to make the optical carrier sin

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7

Shaddad, R. Q., A. B. Mohammad, S. A. Al-Gailani, and A. M. Al-Hetar. "Optical Frequency Upconversion Technique for Transmission of Wireless MIMO-Type Signals over Optical Fiber." Scientific World Journal 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/170471.

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The optical fiber is well adapted to pass multiple wireless signals having different carrier frequencies by using radio-over-fiber (ROF) technique. However, multiple wireless signals which have the same carrier frequency cannot propagate over a single optical fiber, such as wireless multi-input multi-output (MIMO) signals feeding multiple antennas in the fiber wireless (FiWi) system. A novel optical frequency upconversion (OFU) technique is proposed to solve this problem. In this paper, the novel OFU approach is used to transmit three wireless MIMO signals over a 20 km standard single mode fib

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8

Hill, D. A., and J. B. Bodie. "Carrier detection of PSK signals." IEEE Transactions on Communications 49, no. 3 (2001): 487–96. http://dx.doi.org/10.1109/26.911456.

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9

DIMITROV, Dilyan, and Matei KIROV. "USING MULTI-CARRIER PROBING SIGNALS FOR DETECTING NON-LINEAR OBJECTS." SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE 18, no. 1 (2016): 247–50. http://dx.doi.org/10.19062/2247-3173.2016.18.1.33.

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10

Miller Simkins, Lauren, Regina DeWitt, and Alexander Simms. "Methods to reduce sample carrier contamination for luminescence measurements." Ancient TL 31, no. 1 (2013): 19–28. https://doi.org/10.26034/la.atl.2013.470.

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Equivalent doses derived from sediment measurements void of signal contamination are essential for accurate optically stimulated luminescence (OSL) dating of sediments. We identified dose-dependent luminescence signals originating from new and previously used stainless steel cups used for OSL measurements. The signal is not eliminated under typical measurement conditions for sedimentary quartz including pre-heating, infrared stimulation, and OSL stimulation at 125°C. While signals from sample carriers are typically small sources of error they may strongly contaminate sediment with low OSL sens

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11

Matsumoto, Masayuki, and Ryo Nishimura. "Optical carrier extraction from carrier-less phase modulated optical signals." IEICE Electronics Express 12, no. 24 (2015): 20150913. http://dx.doi.org/10.1587/elex.12.20150913.

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12

Zhang, Peng, and Le Nan Wu. "A Realization Method for Multi-Carrier MPPSK Modulations." Applied Mechanics and Materials 462-463 (November 2013): 615–18. http://dx.doi.org/10.4028/www.scientific.net/amm.462-463.615.

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In order to realize multi-carrier transmission of MPPSK modulation, a method was proposed after analyzing the cause of the internal channel interference (ICI) among multi MPPSK signals. The ICI was eliminated by reducing the modulation order of each MPPSK signal to a certain level and modulating MPPSK signals to different parts of a same symbol cycle. The information rates of single carrier modulation and multi-carrier modulation were compared to illustrate the role of order reduction. The BER performances of single carrier modulation and multi-carrier modulation were also carried out by simul

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13

Bhogal, Rosepreet Kaur, and Manoj Sindhwani. "Generation of Single Sideband-Suppressed carrier (SSB-SC) Signal Based on Stimulated Brillouin Scattering." Journal of Physics: Conference Series 2327, no. 1 (2022): 012025. http://dx.doi.org/10.1088/1742-6596/2327/1/012025.

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Abstract A novel cost-effective wavelength shifter is suggested in this paper. This paper shows how to shift signals in the mm-wave area using a frequency shifter. Due to stimulated Brillouin scattering in optical fibre, the proposed approach produces a single sideband signal without the carrier signal. When compared to SSB-SC transmissions, the bandwidth efficiency of double sideband signals is lower. Because it employs an optical fibre with a performance degrading condition such as SBS as an application, the frequency shifter is entirely optical. The theory of Gain and Loss Spectrum of SBS w

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14

Chen, Siyu, Hang Sun, Min Weng, Shijie Wen, Le Li, and Bingqing Liu. "Design and Research of Channel Circuit Based on Broadband Power Line Carrier." Journal of Physics: Conference Series 2433, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2433/1/012017.

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Abstract In order to effectively improve the anti-attenuation, anti-noise and anti-impedance change capabilities of the low-voltage narrowband power line carrier communication unit, reduce the carrier signal coupling attenuation, and highly fidelity signal power encoded and modulated by the carrier chip, an improved high-speed power line carrier communication transceiver circuit is designed. Using 303.13kHz~357.81kHz as sub-carrier signal frequency can effectively avoid the random noise generated by high-power power electronic equipment and household appliances below 35kHz. At the same time, t

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Al-Haddad, Mohammed Kasim. "GENERATION OF MPSK SIGNAL USING LOGIC CIRCUITS." Journal of Engineering 18, no. 03 (2023): 381–91. http://dx.doi.org/10.31026/j.eng.2012.03.01.

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The traditional technique of generating MPSK signals is basically to use IQ modulator that involves analog processing like multiplication and addition where inaccuracies may exist and would lead to imbalance problems that affects the output modulated signal and hence the overall performance of the system. In this paper, a simple method is presented for generating the MPSK using logic circuits that basically generated M-carrier signals each carrier of different equally spaced phase shift. Then these carriers are time multiplexed, according to the data symbols, into the output modulated signal.

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16

Arnaud, Q. "Signals Induced by Charge Carrier Trapping." Journal of Low Temperature Physics 176, no. 5-6 (2014): 924–29. http://dx.doi.org/10.1007/s10909-014-1106-8.

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17

Vassallo, Enrico, and Monica Visintin. "Carrier phase synchronization for GMSK signals." International Journal of Satellite Communications 20, no. 6 (2002): 391–415. http://dx.doi.org/10.1002/sat.729.

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18

Shanmugasundaram, S. "Sub Carrier Analysis for QAM Modulation." Bulletin of Electrical Engineering and Informatics 6, no. 4 (2017): 354–57. http://dx.doi.org/10.11591/eei.v6i4.866.

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Orthogonal Frequency Division Multiplexing (OFDM) based wireless data transmission system is a multi-carrier system in which single higher rate data stream can be divided into multiple lower rate data streams. Modulation and De-Modulation technique play a major role in OFDM based data transmission system. Based on Modulation technique only, the frequency transformation method and encoding and decoding methods are enabled. Effective modulation techniques called as “Quadrature Amplitude Modulation (QAM)” modulation are used to design an OFDM System. Carrier signal is one of the important signals

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S., Shanmugasundaram. "Sub Carrier Analysis for QAM Modulation." Bulletin of Electrical Engineering and Informatics 6, no. 4 (2017): 354–57. https://doi.org/10.11591/eei.v6i4.866.

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Orthogonal Frequency Division Multiplexing (OFDM) based wireless data transmission system is a multi-carrier system in which single higher rate data stream can be divided into multiple lower rate data streams. Modulation and De-Modulation technique play a major role in OFDM based data transmission system. Based on Modulation technique only, the frequency transformation method and encoding and decoding methods are enabled. Effective modulation techniques called as “Quadrature Amplitude Modulation (QAM)”modulation are used to design an OFDM System. Carrier signal is one of the import

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20

Zhang, Dong Ling, and Lin Dong Ge. "High-Accuracy Carrier Frequency Offset Estimation for MPSK Signals." Applied Mechanics and Materials 195-196 (August 2012): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.599.

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In this paper a high accuracy estimation algorithm of carrier frequency offset for MPSK signals in Gaussian white noise is proposed. Like the conventional practice, first the algorithm employs nonlinear processing to convert the MPSK signal to single sinusoidal signal, followed by windowed FFT, and then a method based on energy center correction is used to achieve accurate estimation. Simulation results have proved the feasibility,easiness of implementation, and the performance improvements in terms of accuracy and data length needed.

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21

Shelesh, Kumar Jain* Rekha Gupta. "IMPULSIVE NOISE CANCELLATION IN SINGLE-CARRIER FDMA TRANSMISSION USING DIFFERENT MODULATION SCHEMES." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 2 (2017): 35–42. https://doi.org/10.5281/zenodo.266751.

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Communication signals over power-line channels can be affected greatly by impulsive noise (IN). The effect of this noise is commonly reduced with the application of a nonlinear preprocessor at the receiver such as blanking or clipping that blanks and/or clips the received signal when it exceeds a certain threshold. Erroneous blanking/clipping of the unaffected signals can lead to significant performance degradations. It is found that determining the optimal blanking/clipping threshold is the key for achieving best performance. In contract to these studies, we show in this paper that the perfor

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22

Liu, Fang, Jianzhao Liu, Yuanyuan Bian, and Qing Geng. "Cascaded H-bridge power carrier communication method based on harmonic injection." Journal of Physics: Conference Series 2814, no. 1 (2024): 012063. http://dx.doi.org/10.1088/1742-6596/2814/1/012063.

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Abstract Scaded H-bridge inverter systems are widely used, but there are complex communication problems between multiple module communications. In this paper, a power carrier communication method injecting the third harmonic is proposed for a single-phase cascaded H-bridge system. The third harmonic is superimposed on the SPWM sinusoidal waveform as a modulating signal and demodulated from the acquired current signals by means of DQ conversion. The baseband input signals are directly observed from the Id and Iq signals. There is no need to add additional communication lines. The method is simp

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23

Donchenko, S. I., O. V. Denisenko, A. M. Kaverin, V. B. Pudlovsky, A. A. Frolov, and A. S. Bondarenko. "Carrier frequency phase calibration method for global navigation satellite systems signal simulators." Izmeritel`naya Tekhnika, no. 1 (March 8, 2024): 40–47. http://dx.doi.org/10.32446/0368-1025it.2024-1-40-47.

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Measurements of carrier frequency phase differences of global navigation satellite system signals between multiple antennas are used in many coordinate and navigation applications. Global navigation satellite systems signal simulators are used for controlling global navigation satellite systems receiver’s instrumental errors. Therefore, it is necessary to determine the systematic error of the carrier frequency phase of generated signals for signal simulators. For this purpose a new calibration method of global navigation satellite systems simulators was developed. Method is based on refined er

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24

Görçin, Ali. "Blind Cyclostationary-Based Carrier Number and Spacing Estimation for Carrier-Aggregated Direct Sequence Spread Spectrum Cellular Signals." Electronics 13, no. 18 (2024): 3743. http://dx.doi.org/10.3390/electronics13183743.

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Automatic and blind parameter estimation based on the inherent features of wireless signals is a major research area due to the fact that these techniques lead to the simplification of receivers, especially in terms of coarse synchronization, and more importantly reduce the signaling load at the control channels. Thus, in the literature, many techniques are proposed to estimate a vast set of parameters including modulation types and orders, data and chip rates, phase and frequency offsets, and so on. In this paper, a cyclostationary feature detection (CFD) based method is proposed to estimate

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25

SHORT, KEVIN M. "STEPS TOWARD UNMASKING SECURE COMMUNICATIONS." International Journal of Bifurcation and Chaos 04, no. 04 (1994): 959–77. http://dx.doi.org/10.1142/s021812749400068x.

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This work tests the level of security in secure communication systems based on nonlinear dynamics (NLD), or chaos. In these systems, a chaotic carrier signal is used in a type of spread-spectrum signaling system, with the added benefit that the hidden information signal is buried at something of the order of −30 dB with respect to the chaotic carrier. To investigate the level of security in such systems, an examination was conducted on a test set of chaotic carriers and hidden information signals prepared by the NLD research group at the Naval Research Lab. The hidden signals included a triang

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26

Dvornikov, Sergey S., Kirill D. Zheglov, and Sergey V. Dvornikov. "SSB signals with controlled pilot level." T-Comm 17, no. 3 (2023): 41–47. http://dx.doi.org/10.36724/2072-8735-2023-17-3-41-47.

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An approach to the formation of single-sideband modulation signals based on quadrature synthesis is considered. The relevance of the use of single-sideband modulation signals for decameter radio communication systems is demonstrated. The analytical generality of the signals of amplitude and single-sideband modulation is shown in the transition to the analytical form of their representation. An analysis of the known methods for generating signals of single-sideband modulation with a suppressed carrier has been carried out. Their advantages and disadvantages are shown. The structural commonality

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Dvornikov, Sergey, Sergey Dvornikov, and Kirill Zheglov. "Noise Immunity of Single-Sideband Modulation Signals with a Controlled Carrier Level." Informatics and Automation 22, no. 2 (2023): 261–88. http://dx.doi.org/10.15622/ia.22.2.2.

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Single-sideband modulation is actively used in the organization of communication through the ionospheric channel in the decameter range of radio waves. This is due to the fact that transmissions with single-sideband modulation make it possible to minimize the frequency band while maintaining the information transfer rate and at the same time increase the noise immunity of reception in relation to transmissions with amplitude and frequency analog modulation. At the same time, the widespread use of quadrature synthesis technologies has opened up new possibilities for the formation of transmissio

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Hahn, S. L., and K. M. Snopek. "Quasi-analytic multidimensional signals." Bulletin of the Polish Academy of Sciences: Technical Sciences 61, no. 4 (2013): 1017–24. http://dx.doi.org/10.2478/bpasts-2013-0109.

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Abstract In a recent paper, the authors have presented the unified theory of n-dimensional (n-D) complex and hypercomplex analytic signals with single-orthant spectra. This paper describes a specific form of these signals called quasi-analytic. A quasi-analytic signal is a product of a n-D low-pass (base-band) real (in general non-separable) signal and a n-D complex or hypercomplex carrier. By a suitable choice of the carrier frequency, the spectrum of a low-pass signal is shifted into a single orthant of the Fourier frequency space with a negligible leakage into other orthants. A measure of t

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Pecheritsa, D. S., S. Y. Burtsev, and A. A. Frolov. "Method for determining the fractional part of the carrier frequency cycle of the simulator GNSS signals." Izmeritel`naya Tekhnika, no. 11 (2020): 42–48. http://dx.doi.org/10.32446/0368-1025it.2020-11-42-48.

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The article presents the calibration problem of a navigation signals simulator while ensuring the measurements uniformity of coordinate and time measuring instruments. The method of determining the carrier frequency cycle fractional part in the simulator RF circuit output and standart deviation estimate of the pseudorange generation error by the simulator on the carrier phase with using of an oscilloscope is presented. The method essence is to determine the phase difference between two signals: the simulator absolute calibration with a single RF output – the phase difference between the naviga

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30

Carafoli, Ernesto. "Calcium - a universal carrier of biological signals." FEBS Journal 272, no. 5 (2005): 1073–89. http://dx.doi.org/10.1111/j.1742-4658.2005.04546.x.

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31

Trzaska, H. "Carrier wave frequency multiplication of AM signals." IEEE Transactions on Broadcasting 44, no. 3 (1998): 294–99. http://dx.doi.org/10.1109/11.715315.

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Yin, Jing, Yan Zhao, Feng Yang, Dengcai Yang, and Xiaoyu Wang. "A Photonics-Assisted Binary/Quaternary Phase-Coded Microwave Signal Generator Applicable to Digital I/O Interfaces." Micromachines 14, no. 5 (2023): 1034. http://dx.doi.org/10.3390/mi14051034.

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A photonics-assisted binary/quaternary phase-coded microwave signal generator with fundamental/doubling reconfigurable carrier frequency applicable to digital I/O interfaces is proposed and has been verified by experiments. This scheme is based on a cascade modulation scheme, which is used to reconfigure fundamental/doubling carrier frequency and load the phase-coded signal, respectively. By controlling the radio frequency (RF) switch and the bias voltages of the modulator, the switching of the fundamental or doubling carrier frequency can be realized. When the amplitudes and sequence pattern

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Sun, Cheng Xiang, Yang Meng Tian, Qing Wen Yan, Lu Wei SUN, and Fu Xue Zhang. "Analyses on Output Signal of Silicon Micro-Machined Gyroscope." Applied Mechanics and Materials 20-23 (January 2010): 17–21. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.17.

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The structure and principle of silicon micro-machined gyroscope used for rotating carrier is introduced. The dynamic equations of axially moving are derived by analyzing three-axis moving of MEMS three-axis simulator. The result of simulation shows three moving locus of the head of rolling airframe missile, and three output signals from silicon micro-machined gyroscope which fix on inner plate of three-axis simulator, some rules of three output signals of three moving locus are gained. The signal of the gyroscope couples the frequency of the rotating carrier which makes the coning motion, so t

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Zhang, Qinghua, Yongxing Zhu, and Zhengsheng Chen. "An In-Depth Assessment of the New BDS-3 B1C and B2a Signals." Remote Sensing 13, no. 4 (2021): 788. http://dx.doi.org/10.3390/rs13040788.

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An in-depth and comprehensive assessment of new observations from BDS-3 satellites is presented, with the main focus on the Carrier-to-Noise density ratio (C/N0), the quality of code and carrier phase observations for B1C and B2a signal. The signal characteristics of geosynchronous earth orbit (GEO), inclined geosynchronous satellite orbit (IGSO) and medium earth orbit (MEO) satellites of BDS-3 were grouped and compared, respectively. The evaluation results of the new B1C and B2a signals of BDS-3 were compared with the previously B1I/B2I/B3I signals and the interoperable signals of GPS, Galile

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Bui, Kien, Chau Dinh, Nguyen Manh Thang, and Pham Thanh Quang. "Capacity to generate random signals by semi-nonlinear coupler." Journal of Military Science and Technology 89 (August 25, 2023): 94–102. http://dx.doi.org/10.54939/1859-1043.j.mst.89.2023.94-102.

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The semi-nonlinear coupler (SNC) is used to split an optical signal into two different amplitude signals, and to reshape a series of signals. The mentioned applications are based on the monotonical dependence of the transmission coefficients on the input intensity, which changes in an interval. In this paper, we show that there is a certain interval of input intensity, in which the transmission coefficients overlap one to other. This behaviors of SNC can be used to generate random signals. Using the expression described the output-input power relation, the expression of the optical merge signa

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Zhao, Yiru, Chaoquan Wang, Zeping Zhao, Weijie Zhang, and Jianguo Liu. "A Microwave Photonics True-Time-Delay System Using Carrier Compensation Technique Based on Wavelength Division Multiplexing." Photonics 10, no. 1 (2022): 34. http://dx.doi.org/10.3390/photonics10010034.

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A novel microwave photonic true-time-delay (TTD) system using carrier compensation technology is proposed and experimentally demonstrated. Wavelength division multiplexing combines ten lasers into a single beam. We separate one channel from the laser as a compensating carrier, and the compensation carrier is combined with the time-delayed optical signals to be detected. Meanwhile, sideband signals are amplified effectively thanks to carrier-suppressed double-sideband (CS-DSB) modulation. Therefore, the power of both the central optical carriers and sidebands is guaranteed, which produces a bet

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Brusin, E. "Direct Sequence Spread Spectrum Signal’s Demodulator Acquisition Implementation Based on Fast Fourier Transform. Part 2. Carrier Frequency Estimation." Proceedings of Telecommunication Universities 9, no. 1 (2023): 35–40. http://dx.doi.org/10.31854/1813-324x-2023-9-1-35-40.

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Signals with direct spread spectrum are widespread in modern communication and navigation systems. Often for communication channels in which such signals are used, significant changes in the carrier frequency in relation to the information speeds of the received signals are characteristic. In particular, for communication channels with significant Doppler shift. Therefore, estimation of the carrier frequency plays a key role in solving the problem of initial synchronization of demodulators of signals with direct spectral broadening. In the first part of the paper, the main approaches to solvin

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Yan, Liuming, Yuefei Ma, and Jorge M. Seminario. "Encoding Information Using Molecular Vibronics." Journal of Nanoscience and Nanotechnology 6, no. 3 (2006): 675–84. http://dx.doi.org/10.1166/jnn.2006.087.

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Signals carrying information are encoded in molecular vibrational waves (vibronics) rather than in electric currents as widely done in microelectronics. We demonstrate theoretically that signals can be transmitted along a long polypeptide molecule; the signal is modulated in a terahertz carrier corresponding to a frequency of an intrinsic vibrational mode of the backbone of the polypeptide, via amplitude and frequency modulations. The modulated carrier is coupled as a vibrational wave to the polypeptide at one end of the molecule and propagates for more than 168 Å towards the other end. Digita

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Khairuddin, N. Z., M. H. A. Wahid, N. A. M. A. Hambali, et al. "Investigation of All-photonic Multiple Signals Format Converter to Carrier- suppressed Signals." MATEC Web of Conferences 78 (2016): 01112. http://dx.doi.org/10.1051/matecconf/20167801112.

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Yin, Jing, Yan Zhao, Feng Yang, Dengcai Yang, and Yunxin Wang. "Generation of a Fundamental/Doubled Frequency Phase-Coded Microwave Signal Based on Polarization Multiplexed Technology." Photonics 10, no. 3 (2023): 293. http://dx.doi.org/10.3390/photonics10030293.

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Microwave photonic phase-shifting technology can be used to generate high-frequency, broadband, and tunable phase-coded microwave signals, which are helpful in solving the contradiction between the detection range and the range resolution in radar systems. A method for generating a reconfigurable carrier phase-coded signal of a fundamental or doubled carrier frequency, based on polarization multiplexed technology, is proposed and verified by the experiments in this paper. A dual-parallel dual-polarization Mach–Zehnder modulator (DP-DPMZM) and a polarization-dependent phase modulator (PD-PM) we

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Sun, Jie, Jiaolong Wei, Zuping Tang, and Yuze Duan. "Rapid High-Precision Ranging Technique for Multi-Frequency BDS Signals." Remote Sensing 16, no. 23 (2024): 4352. http://dx.doi.org/10.3390/rs16234352.

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The rapid expansion of BeiDou satellite navigation applications has led to a growing demand for real-time high-precision positioning services. Currently, high-precision positioning services face challenges such as a long initialization time and heavy reliance on reference station networks, thereby failing to fulfill the requirements for real-time, wide-area, and centimeter-level positioning. In this study, we consider the multi-frequency signals that are broadcast by a satellite to share a common reference clock and possess identical RF channels and propagation paths with strict temporal, spec

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Vaigandla, Karthik Kumar, and J. Benita. "A Novel PAPR Reduction in Filter Bank Multi-Carrier (FBMC) with Offset Quadrature Amplitude Modulation (OQAM) Based VLC Systems." International Journal on Recent and Innovation Trends in Computing and Communication 11, no. 5 (2023): 288–99. http://dx.doi.org/10.17762/ijritcc.v11i5.6616.

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The peak to average power ratio (PAPR) is one of the major problem with multicarrier-based systems. Due to its improved spectral efficiency and decreased PAPR, Filter Bank Multicarrier (FBMC) has recently become an effective alternative to the orthogonal multiplexing division (OFDM). For filter bank multicarrier communication/offset quadrature amplitude modulation-Visible light communication (FBMC/OQAM-VLC) systems is proposed a PAPR reduction technique. The suggested approach overlaps the proposed FBMC/OQAM-based VLC data signal with the existing signals. Non-redundant signals and data signal

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Lin, Meiyan, Xiaoxu Zhang, Ye Tian, and Yonghui Huang. "Multi-Signal Detection Framework: A Deep Learning Based Carrier Frequency and Bandwidth Estimation." Sensors 22, no. 10 (2022): 3909. http://dx.doi.org/10.3390/s22103909.

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Multi-signal detection is of great significance in civil and military fields, such as cognitive radio (CR), spectrum monitoring, and signal reconnaissance, which refers to jointly detecting the presence of multiple signals in the observed frequency band, as well as estimating their carrier frequencies and bandwidths. In this work, a deep learning-based framework named SigdetNet is proposed, which takes the power spectrum as the network’s input to localize the spectral locations of the signals. In the proposed framework, Welch’s periodogram is applied to reduce the variance in the power spectra

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Ma, Jiangang, Yikang Yang, Lvyang Ye, Lingyu Deng, and Hengnian Li. "Dual-Sideband Constant-Envelope Frequency-Hopping Binary Offset Carrier Multiplexing Modulation for Satellite Navigation." Remote Sensing 14, no. 16 (2022): 3871. http://dx.doi.org/10.3390/rs14163871.

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Frequency-hopping binary offset carrier modulation improves the anti-interference performance and mitigates the autocorrelation function (ACF) ambiguity problem of binary offset carrier modulation. To save payload resources and make high-power amplifiers on satellites operate at the nonlinear saturation region, there is further demand for finding an efficient constant-envelope frequency-hopping binary offset carrier multiplexing technique to combine several signal components. Thus, we propose a dual-sideband constant-envelope multiplexing modulation, named asymmetric constant-envelope frequenc

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Cao, Xiaomao, Hong Ma, Hua Zhang, and Jiang Jin. "Virtual Array-Based Signal Detection and Carrier Frequency Offset Estimation in a Multistatic Collaborative Passive Detection System." Remote Sensing 16, no. 17 (2024): 3152. http://dx.doi.org/10.3390/rs16173152.

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To tackle the problem of difficult signal detection and carrier frequency synchronization faced by wireless communication among stations of the multistatic passive detection system in interference environments, an adaptive signal detection and carrier frequency offset (CFO) estimation method based on a virtual array is proposed in this paper. This is a data-aided method that utilizes a training sequence composed of three segments of sub-training sequences with different symbols. This method first uses spatial spectrum estimation to obtain the coarse frequency estimations of interference signal

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Jiang, Liubing, Xiaolong Zhou, Li Che, Shuwei Rong, and Hexin Wen. "Feature Extraction and Reconstruction by Using 2D-VMD Based on Carrier-Free UWB Radar Application in Human Motion Recognition." Sensors 19, no. 9 (2019): 1962. http://dx.doi.org/10.3390/s19091962.

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As the size of the radar hardware platform becomes smaller and smaller, the cost becomes lower and lower. The application of indoor radar-based human motion recognition has become a reality, which can be realized in a low-cost device with simple architecture. Compared with narrow-band radar (such as continuous wave radar, etc.), the human motion echo signal of the carrier-free ultra-wideband (UWB) radar contains more abundant characteristic information of human motion, which is helpful for identifying different types of human motion. In this paper, a novel feature extraction method by two-dime

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Yan, Tao, Bo Qu, Ying Wang, et al. "A Unified Dual-frequency Constant Envelope Multiplexing Design Framework for Modernised GNSS Signals." Journal of Navigation 71, no. 6 (2018): 1511–30. http://dx.doi.org/10.1017/s0373463318000474.

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In the field of modernised Global Navigation Satellite System (GNSS) signal design, several Dual-frequency Constant Envelope Multiplexing (DCEM) methods have been recently proposed. However, the existing DCEM methods, such as Alternative Binary Offset Carrier (AltBOC), generalised AltBOC and Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC), are only applied in some special cases. In this paper, we present a unified DCEM design framework for GNSS signals. The existing DCEM methods can be unified in this framework. First, the signal components at two carrier frequencies are combined

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Qu, Fengzhong, Zhengchao Li, Minhao Zhang, Xingbin Tu, and Yan Wei. "A Carrier-Based Gardner Timing Synchronization Algorithm for BPSK Signal in Maritime Communication." Journal of Marine Science and Engineering 11, no. 4 (2023): 829. http://dx.doi.org/10.3390/jmse11040829.

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Wireless communication at sea is an essential way to establish a smart ocean. In the communication system, however, signals are affected by the carrier frequency offset (CFO), which results from the Doppler effect and crystal frequency offset. The offset deteriorates the demodulation performance of the communication system. The conventional Gardner bit-synchronization algorithm performs timing synchronization on the baseband, but it fails to solve the problem of carrier frequency offset. In this paper, a carrier-based timing-synchronization Gardner algorithm was proposed. The algorithm perform

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Curran, James T. "Enhancing Weak-Signal Carrier Phase Tracking in GNSS Receivers." International Journal of Navigation and Observation 2015 (November 23, 2015): 1–15. http://dx.doi.org/10.1155/2015/295029.

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Examining the performance of the GNSS PLL, this paper presents novel results describing the statistical properties of four popular phase estimators under both strong- and weak-signal conditions when subject to thermal noise, deterministic dynamics, and typical pedestrian motion. Design routines are developed which employ these results to enhance weak-signal performance of the PLL in terms of transient response, steady-state errors, and cycle-slips. By examining both single and data-pilot signals, it is shown that appropriate design and tuning of the PLL can significantly enhance tracking perfo

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Loayssa, Alayn, David Benito, and María J. Garde. "Optical carrier Brillouin processing of microwave photonic signals." Optics Letters 25, no. 17 (2000): 1234. http://dx.doi.org/10.1364/ol.25.001234.

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