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Journal articles on the topic 'PHASE ERROR BANDWIDTH'

Author: Grafiati

Published: 11 September 2023

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1

Torfs, D., J. De Schutter, and J. Swevers. "Extended Bandwidth Zero Phase Error Tracking Control of Nonminimal Phase Systems." Journal of Dynamic Systems, Measurement, and Control 114, no. 3 (1992): 347–51. http://dx.doi.org/10.1115/1.2897354.

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This paper describes a new feedforward algorithm for accurate tracking control of nonminimal phase systems. Accurate feedforward calculation involves a prefilter design using the inverse system model. Nonminimal phase systems cause problems with this prefilter design, because unstable zeros become unstable poles in the inverse model. The zero phase error tracking control algorithm (ZPETC) consists of a substitution scheme, which removes the unstable zeros. This scheme introduces a small gain error, which increases with frequency, but no phase error. This paper investigates additional propertie

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2

Huang, Yi Cheng, Shu Ting Li, and Kuan Heng Peng. "Precision Motion of Iterative Learning Controller Using Adaptive Filter Bandwidth Tuning by Improved Particle Swarm Optimization Technique." Applied Mechanics and Materials 376 (August 2013): 349–53. http://dx.doi.org/10.4028/www.scientific.net/amm.376.349.

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This paper utilized the Improved Particle Swarm Optimization (IPSO) technique for adjusting the gains of PID and the bandwidth of zero-phase Butterworth Filter of an Iterative Learning Controller (ILC) for precision motion. Simulation results show that IPSO-ILC-PID controller without adaptive bandwidth filter tuning have the chance of producing high frequencies in the error signals when the filter bandwidth is fixed for every repetition. However the learnable and unlearnable error signals should be separated for bettering control process. Thus the adaptive bandwidth of a zero phase filter in I

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3

Zhao, Lei, Lei Shi, and Congying Zhu. "New Nonlinear Second-Order Phase-Locked Loop with Adaptive Bandwidth Regulation." Electronics 7, no. 12 (2018): 346. http://dx.doi.org/10.3390/electronics7120346.

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Synchronization of large acquisition bandwidth brings great challenges to the traditional second-order phase-locked loop (PLL). To address the contradiction between acquisition bandwidth and noise suppression capability of the traditional PLL, a new second-order PLL coupled with a nonlinear element is proposed. The proposed nonlinear second-order PLL regulates the loop noise bandwidth adaptively by the nonlinear module. When a large input–output phase error occurs, this PLL reduces the frequency offset quickly by taking advantage of the large bandwidth. When the phase error is reduced by the l

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4

Passafiume, Marco, Giovanni Collodi, Edoardo Ciervo, and Alessandro Cidronali. "A Novel TDoA-Based Method for 3D Combined Localization Techniques Using an Ultra-Wideband Phase Wrapping-Impaired Switched Beam Antenna." Electronics 10, no. 17 (2021): 2137. http://dx.doi.org/10.3390/electronics10172137.

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This paper presents a novel Time Difference of Arrival-based approach suitable for single-anchor positioning systems, implemented by phase wrapping-impaired array antenna. With the latter being a typical occurrence in large Switched Beam Antenna (SBA) operating in the low microwave range. The proposed method takes advantage from the large bandwidth of radio link, established between the anchor and the positioning target, by generating an unambiguous equivalent phase relationship between antenna array elements. The technique is validated by adopting a relatively large SBA antenna operating in t

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Cruz, Madson Pereira, Rodolfo Novellino Benda, Maria Flávia Soares Pinto Carvalho, Guilherme Menezes Lage, Maria Teresa Cattuzzo, and Herbert Ugrinowitsch. "Bandwidth knowledge of results persists on motor skills acquisition." Motricidade 14, no. 2-3 (2018): 107–14. http://dx.doi.org/10.6063/motricidade.14294.

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The aim of this study was to investigate the short and long-term effects of the bandwidth KR in learning of the absolute and relative dimensions of a motor skill. Twenty-two undergraduate students divided into two groups: G15 who received KR when the relative error exceeded 15%; and G0, with KR after every trial. The study consisted of an acquisition phase, and the volunteers practiced 100 trials with a target time of 850 ms and relative of 22.2%, 44.4% and 33.3% between the first and second, second and third, third and fourth keys, respectively. This phase, KR related to relative time (relati

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Song, Young-Jin, Thomas Pany, and Jong-Hoon Won. "Theoretical Upper and Lower Limits for Normalized Bandwidth of Digital Phase-Locked Loop in GNSS Receivers." Sensors 23, no. 13 (2023): 5887. http://dx.doi.org/10.3390/s23135887.

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Determining the loop noise bandwidth and the coherent integration time is essential and important for the design of a reliable digital phase-locked loop (DPLL) in global navigation satellite system (GNSS) receivers. In general, designers set such parameters approximately by utilizing the well-known fact that the DPLL is stable if the normalized bandwidth, which is the product of the integration time and the noise bandwidth, is much less than one. However, actual limit points are not fixed at exactly one, and they vary with the loop filter order and implementation method. Furthermore, a lower l

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7

Ferrari, Mauro, and Luca Piattella. "0.8–8 GHz 4-bit MMIC phase shifter for T/R modules." International Journal of Microwave and Wireless Technologies 7, no. 3-4 (2015): 317–26. http://dx.doi.org/10.1017/s1759078715000793.

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This paper presents the design approach and test results of a full passive, decade bandwidth GaAs MMIC, composed by a phase shifter (PS) with a cascaded absorptive single pole double throw switch, suitable for transmitter/receiver modules in active electronically scanned array. The proposed PS – fabricated using a UMS GaAs 0.25 PHEMT process – combines all-pass filters with high-pass filters, in order to provide less than 13 dB insertion loss, less than ±20° phase error and less than ±2.5 dB amplitude error in the 0.8–8 GHz bandwidth.

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Kim, Kyeong-Rok, and Jae-Hyun Kim. "Wideband Waveform Generation Using MDDS and Phase Compensation for X-Band SAR." Remote Sensing 12, no. 9 (2020): 1431. http://dx.doi.org/10.3390/rs12091431.

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This study investigated wideband waveform generation using a field programmable gate array (FPGA) for X-band high-resolution synthetic aperture radar (SAR). Due to the range resolution determined by the bandwidth, we focused on wide bandwidth generation while preserving spectrum quality. The proposed method can generate wide bandwidth using a relatively low system clock. The new approach was designed in Simulink and implemented by very-high-speed-integrated-circuits hardware description language (VHDL). We also proposed a hardware structure in accordance with the proposed method. Signal connec

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9

Torfs, Dirk, and Joris De Schutter. "Optimal Feedforward Prefilter With Frequency Domain Specification for Nonminimum Phase Systems." Journal of Dynamic Systems, Measurement, and Control 118, no. 4 (1996): 791–95. http://dx.doi.org/10.1115/1.2802359.

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The paper shows the influence of the location of unstable zeros on the tracking performance of feedforward prefilters. Unstable zeros are divided into a number of classes. It is shown that existing feedforward prefilters (Zero Phase Error Tracking Control (ZPETC), E-filter, Extended Bandwidth ZPETC, ...) perform well for two classes, but fail for a particular class of unstable zeros. For this class, a characteristic frequency, fc, exists such that the induced gain error attenuates all frequencies of the reference trajectory f ≤ fc and amplifies frequencies f > fc. Hence, it is impossible to

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10

Vyomal N, Pandya, P. Rahul Reddy, and Abhishek Choubey. "Bandwidth Estimation Algorithm of WestwoodNR for Wireless Network." International Journal of Engineering & Technology 7, no. 2.16 (2018): 114. http://dx.doi.org/10.14419/ijet.v7i2.16.11521.

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Two widely known parameters of Transmission Control Protocol (TCP) used to control the flow of packets are Congestion Window (cwnd) & Slow Start Threshold (ssthresh). After congestion, slow start phase or fast-retransmit phase come in action wherein TCP has an important role in the reduction of these parameters. This is in response to packet loss identified by TCP. This in turn will cause unnecessary reduction of data flow & degradation of TCP throughput. Researchers have developed some algorithms to come out of this problem, WestwoodNR is one of them. WestwoodNR is using Bandwidth Est

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11

Zhang, Xuebo, and Peixuan Yang. "An Improved Imaging Algorithm for Multi-Receiver SAS System with Wide-Bandwidth Signal." Remote Sensing 13, no. 24 (2021): 5008. http://dx.doi.org/10.3390/rs13245008.

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When the multi-receiver synthetic aperture sonar (SAS) works with a wide-bandwidth signal, the performance of the range-Doppler (R-D) algorithm is seriously affected by two approximation errors, i.e., point target reference spectrum (PTRS) error and residual quadratic coupling error. The former is generated by approximating the PTRS with the second-order term in terms of the instantaneous frequency. The latter is caused by neglecting the cross-track variance of secondary range compression (SRC). In order to improve the imaging performance in the case of wide-bandwidth signals, an improved R-D

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12

Chen Peng, 陈鹏, 王荣 Wang Rong, 蒲涛 Pu Tao, 卢麟 Lu Lin, 方涛 Fang Tao, and 郑吉林 Zheng Jilin. "Fabrication of Super-Narrow Bandwidth Grating Filter Based on Phase Error Correction." Chinese Journal of Lasers 36, no. 8 (2009): 2076–82. http://dx.doi.org/10.3788/cjl20093608.2076.

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13

Chen, M. H., K. W. Han, M. H. Yang, and X. W. Sun. "Effects of phase-locked loop bandwidth on error vector magnitude in transmitter." Journal of Electromagnetic Waves and Applications 26, no. 10 (2012): 1315–22. http://dx.doi.org/10.1080/09205071.2012.699390.

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14

Bredfeldt, Jeremy S., Xin Miao, Evangelia Kaza, et al. "Patient specific distortion detection and mitigation in MR images used for stereotactic radiosurgery." Physics in Medicine & Biology 67, no. 6 (2022): 065009. http://dx.doi.org/10.1088/1361-6560/ac508e.

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Abstract Objective. In MRI-based radiation therapy planning, mitigating patient-specific distortion with standard high bandwidth scans can result in unnecessary sacrifices of signal to noise ratio. This study investigates a technique for distortion detection and mitigation on a patient specific basis. Approach. Fast B0 mapping was performed using a previously developed technique for high-resolution, large dynamic range field mapping without the need for phase unwrapping algorithms. A phantom study was performed to validate the method. Distortion mitigation was validated by reducing geometric d

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15

Kottas, James A. "Training Periodic Sequences Using Fourier Series Error Criterion." Neural Computation 5, no. 1 (1993): 115–31. http://dx.doi.org/10.1162/neco.1993.5.1.115.

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Training a network to learn a set of periodic input/output sequences effectively makes the network learn a mapping between amplitudes and phases in Fourier space. The spectral backpropagation (SBP) training algorithm is a different way of doing this task. It measures the Fourier series components of the output error sequences and minimizes the total spectral energy as an adaptation criterion. This approach can train not only the weights but also time delays associated with the interconnects. Furthermore, the cells can have finite bandwidth via a first-order low-pass filter. Having adaptable ti

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16

Schempf, H., and D. R. Yoerger. "Study of Dominant Performance Characteristics in Robot Transmissions." Journal of Mechanical Design 115, no. 3 (1993): 472–82. http://dx.doi.org/10.1115/1.2919214.

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Six different transmission types suitable for robotic manipulators were compared in an experimental and theoretical study. Single-degree-of-freedom mechanisms based on the different transmissions were evaluated in terms of force control performance, achievable bandwidth, and stability properties in hard contact tasks. Transmission types considered were (1) cable reducer, (2) harmonic drive, (3) cycloidal disk reducer, (4) cycloidal cam reducer, (5) ball reducer, and (6) planetary/cycloidal gear head. Open loop torque following error, attenuation and phase lag, and closed loop bandwidth and sta

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17

Li, Qunsheng, and Yan Zhao. "An Innovative High-Precision Scheme for a GPS/MEMS-SINS Ultra-Tight Integrated System." Sensors 19, no. 10 (2019): 2291. http://dx.doi.org/10.3390/s19102291.

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The Doppler-assisted error provided by a low-precision microelectromechanical system (MEMS) strapdown inertial navigation system (SINS) increases rapidly. Therefore, the bandwidth of the tracking loop for a global positioning system (GPS)/MEMS-SINS ultra-tight integration system is too narrow to track Doppler shift. GPS measurement error is correlated with the MEMS-SINS velocity error when the Doppler-assisted error exists, leading to tracking loop lock loss. The estimated precision of the integrated Kalman filter (IKF) also decreases. Even the integrated system becomes unstable. To solve this

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18

Zhai, Yu, Xiaoxing Fang, Kejia Ding, and Fei He. "Miniaturization Design for 8 × 8 Butler Matrix Based on Back-to-Back Bilayer Microstrip." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/583903.

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A low-cost, compact 8 × 8 Butler matrix based on a novel bilayer microstrip configuration is presented and implemented for 4.3 GHz telecommunication application. A back-to-back placed bilayer microstrip structure has been proposed to avoid using crossover. To expand operational bandwidth of the Butler matrix, a three-branch line directional coupler has been employed as 3 dB/90° bridge, and a kind of improved two-order Schiffman phase shifter has been adopted as fixed phase shifter. For application of indoor wireless communication, a compact broadband 8 × 8 Butler matrix has been designed and f

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19

Chen, Chwan-Hsen, Hendrik Van Brussel, and Jan Swevers. "Extended Pole Placement Method With Noncausal Reference Model for Digital Servo-Control." Journal of Dynamic Systems, Measurement, and Control 117, no. 4 (1995): 641–44. http://dx.doi.org/10.1115/1.2801127.

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The extended pole placement (EPP) method extends the well-known pole placement method to digital servo-control with known control inputs. A servo-control system designed using the EPP method achieves an accurate command response through the use of a noncausal reference model and an accurate approximation of nonminimum-phase zeros. The phase error of the command response between the desired output and the actual output may be made arbitrarily small, while its gain extends uniformly to a selectable bandwidth. A selectable feedforward bandwidth is important in controlling flexible structures wher

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20

Zhao, Li Ru, Xiao Zhang Zhang, Kai Zhang, and Tong Zhang. "Research on Control Precision of the Neutron Bandwidth Chopper." Applied Mechanics and Materials 220-223 (November 2012): 1077–83. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1077.

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Operation of neutron bandwidth limiting chopper requires high controlling precision. Phase difference between the chopper rotor and the synchronous pulse signal should be maintained to be fixed. Rotating frequency of the rotor needs to be very stable. To achieve the above technical requirements, control scheme, dynamic balance, and other means are made. Thus influences to control accuracy are effectively reduced, which are from rotor asymmetry and neutron absorbing materials. In the case described in this paper, phase tracking error was controlled under ±0.10752°with 90% confidence for the des

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21

Sugak, Mikhail, Svyatoslav Ballandovich, Grigory Kostikov, Lubov Liubina, and Yury Antonov. "Increasing bandwidth of full-metal slot reflectarray antennas." ITM Web of Conferences 30 (2019): 05023. http://dx.doi.org/10.1051/itmconf/20193005023.

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Results of theoretical and experimental investigations of full-metal slot reflectarray antennas with increased bandwidth are presented. Bandwidth increasing is achieved by means of certain sizes choice for each reflective element so that the phase-error minimum in a required frequency range would be created . Two prototypes - single-layer and two-layer - of K-band slot reflectarray antennas have been manufactured and tested. Effectiveness of the described designing routine is proved by experimental data: achieved bandwidth for the single-layer and two-layer structure is 25% and 32% respectivel

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22

PU, XIAO, KRISHNASWAMY NAGARAJ, JACOB ABRAHAM, and AXEL THOMSEN. "A NOVEL FRACTIONAL-N PLL BASED ON A SIMPLE REFERENCE MULTIPLIER." Journal of Circuits, Systems and Computers 21, no. 06 (2012): 1240010. http://dx.doi.org/10.1142/s0218126612400105.

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A wide loop bandwidth in fractional-N PLL is desirable for good jitter performance. However, a wider bandwidth reduces the effective oversampling ratio between update rate and loop bandwidth, making quantization error a much bigger noise contributor. A successful implementation of a wideband frequency synthesizer is in managing jitter and spurious performance. In this paper we present a new PLL architecture for bandwidth extension. By using clock squaring buffers with built-in offsets, multiple clock edges are extracted from a single reference cycle and utilized for phase update, thereby effec

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23

Torres Nova, Juan Mario, and Hernán Paz Penagos. "Studying and comparing spectrum efficiency and error probability in GMSK and DBPSK modulation schemes." Ingeniería e Investigación 28, no. 3 (2008): 75–80. http://dx.doi.org/10.15446/ing.investig.v28n3.15123.

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Gaussian minimum shift keying (GMSK) and differential binary phase shift keying (DBPSK) are two digital modulation schemes which are -frequently used in radio communication systems; however, there is interdependence in the use of its benefits (spectral efficiency, low bit error rate, low inter symbol interference, etc). Optimising one parameter creates problems for another; for example, the GMSK scheme succeeds in reducing bandwidth when introducing a Gaussian filter into an MSK (minimum shift ke-ying) modulator in exchange for increasing inter-symbol interference in the system. The DBPSK sche

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Chen, Xiao Gang, Chao Jiang, Zhao Xu Liu, and De Xiu Huang. "Spectral Efficiency of Phase Encoding OCDMA Systems." Advanced Materials Research 760-762 (September 2013): 133–36. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.133.

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The spectral efficiency and bit-error-rate (BER) of phase encoding optical code division multiple access (OCDMA) systems is evaluated, coherent time-spreading (TS) and spectral phase encoding (SPE) OCDMA systems are considered. The results indicate that SPE-OCDMA has better tolerance to performance degradation due to receivers bandwidth limitation than TS-OCDMA system, while for the practical en/decoders with implementable longest code length, TS-OCDMA can yield a spectral efficiency advantage over SPE-OCDMA systems.

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25

Zhang, Geng, Mingche Lai, and Fangxu Lyu. "A Multichannel, High-Bandwidth Wirelane Receiver for D2D Interconnects." Electronics 11, no. 18 (2022): 2864. http://dx.doi.org/10.3390/electronics11182864.

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This paper proposes a multichannel and high-bandwidth (BW) receiver for standard packaging die-to-die (D2D) interconnects. The receiver adopts forward clock (FCK) architecture of the high-density transmission standard, which consists of 16 high-speed data paths and a pair of low-speed differential clocks for 512 Gbps BW. To reduce the chip area and power consumption, a common minimal phase-locked loop (MINI-PLL) and data adjustment (CDA) circuit to replaces the clock data recovery circuit (CDR) in the traditional receiver. A delay-matching circuit is adopted to combat PVT variation and lane sk

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26

Lee, Haemin, Chang-Sik Jung, and Ki-Wan Kim. "Feature Preserving Autofocus Algorithm for Phase Error Correction of SAR Images." Sensors 21, no. 7 (2021): 2370. http://dx.doi.org/10.3390/s21072370.

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Autofocus is an essential technique for airborne synthetic aperture radar (SAR) imaging to correct phase errors mainly due to unexpected motion error. There are several well-known conventional autofocus methods such as phase gradient autofocus (PGA) and minimum entropy (ME). Although these methods are still widely used for various SAR applications, each method has drawbacks such as limited bandwidth of estimation, low convergence rate, huge computation burden, etc. In this paper, feature preserving autofocus (FPA) algorithm is newly proposed. The algorithm is based on the minimization of the c

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27

Tung, E. D., M. Tomizuka, and Y. Urushisaki. "High-Speed End Milling Using a Feedforward Control Architecture." Journal of Manufacturing Science and Engineering 118, no. 2 (1996): 178–87. http://dx.doi.org/10.1115/1.2831010.

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Experiments are performed for end milling aluminum at 15,000 RPM spindle speed (1,508 m/min cutting speed) and up to 3 m/min table feedrate using an experimental machine tool control system. A digital feedforward controller for feed drive control incorporates the Zero Phase Error Tracking Controller (ZPETC) and feedforward friction compensation. The controller achieves near-perfect (±3 μm) tracking over a 26 mm trajectory with a maximum speed of 2 m/min. The maximum contouring error for a 26 mm diameter circle at this speed is less than 4 μm. Tracking and contouring experiments are conducted f

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Song, Young-Jin, and Jong-Hoon Won. "Table-Based Adaptive Digital Phase-Locked Loop for GNSS Receivers Operating in Moon Exploration Missions." Sensors 22, no. 24 (2022): 10001. http://dx.doi.org/10.3390/s222410001.

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An adaptive digital phase-locked loop (DPLL) continually adjusts the noise bandwidth of the loop filter in global navigation satellite system (GNSS) receivers to track signals by measuring the signal-to-noise ratio and/or dynamic stress. Such DPLLs have a relatively large amount of computational complexity compared with the conventional DPLL. A table-based adaptive DPLL is proposed that adjusts the noise bandwidth value by extracting it from the pre-generated table without additional calculations. The values of the noise bandwidth table are computed in an optimal manner in consideration of the

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29

Wang, Rui, and Zhong Wu. "Suppressing Quadrature Error and Harmonics in Resolver Signals via Disturbance-Compensated PLL." Machines 10, no. 8 (2022): 709. http://dx.doi.org/10.3390/machines10080709.

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The aim of this study was to obtain accurate angular positions and velocities from resolver signals; resolver-to-digital conversion (RDC) often adopts a phase-locked loop (PLL) as a demodulation algorithm. However, resolver signals often come with quadrature errors and harmonics, which lead to a severe reduction in PLL accuracy. The conventional PLL does not consider the impact of the quadrature error, and the bandwidth of the PLL is much larger than the fundamental frequency of resolver signals for pursuing a low dynamic error. These reasons render the retention of resolver harmonics in the d

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30

Chen, Xing, Tianzhu Yi, Feng He, Zhihua He, and Zhen Dong. "An Improved Generalized Chirp Scaling Algorithm Based on Lagrange Inversion Theorem for High-Resolution Low Frequency Synthetic Aperture Radar Imaging." Remote Sensing 11, no. 16 (2019): 1874. http://dx.doi.org/10.3390/rs11161874.

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The high-resolution low frequency synthetic aperture radar (SAR) has serious range-azimuth phase coupling due to the large bandwidth and long integration time. High-resolution SAR processing methods are necessary for focusing the raw data of such radar. The generalized chirp scaling algorithm (GCSA) is generally accepted as an attractive solution to focus SAR systems with low frequency, large bandwidth and wide beam bandwidth. However, as the bandwidth and/or beamwidth increase, the serious phase coupling limits the performance of the current GCSA and degrades the imaging quality. The degradat

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Asoodeh, Alireza, and Mojtaba Atarodi. "A Full 360$^{\circ}$ Vector-Sum Phase Shifter With Very Low RMS Phase Error Over a Wide Bandwidth." IEEE Transactions on Microwave Theory and Techniques 60, no. 6 (2012): 1626–34. http://dx.doi.org/10.1109/tmtt.2012.2189227.

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Chen, Zhen, Zhimin Zhang, Yashi Zhou, Pei Wang, and Jinsong Qiu. "A Novel Motion Compensation Scheme for Airborne Very High Resolution SAR." Remote Sensing 13, no. 14 (2021): 2729. http://dx.doi.org/10.3390/rs13142729.

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Due to the atmospheric turbulence, the motion trajectory of airborne very high resolution (VHR) synthetic aperture radars (SARs) is inevitably affected, which introduces range-variant range cell migration (RCM) and aperture-dependent azimuth phase error (APE). Both types of errors consequently result in defocused images, as residual range- and aperture-dependent motion errors are significant in VHR-SAR images. Nevertheless, little work has been devoted to the range-variant RCM auto-correction and aperture-dependent APE auto-correction. In this paper, a precise motion compensation (MoCo) scheme

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Qin, Haoye, and Zhong Wu. "Angle Tracking Observer with Improved Accuracy for Resolver-to-Digital Conversion." Symmetry 11, no. 11 (2019): 1347. http://dx.doi.org/10.3390/sym11111347.

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A resolver is an absolute shaft sensor which outputs pair signals with ortho-symmetric amplitudes. Ideally, they are sinusoidal and cosinusoidal functions of the shaft angle. In order to demodulate angular position and velocity from resolver signals, resolver-to-digital conversion (RDC) is necessary. In software-based RDC, most algorithms mainly employ a phase-locked loop (PLL)-based angle tracking observer (ATO) to form a type-II system. PLL can track the detected angle by regulating the phase error from the phase detector which depends on the feature of orthogonal symmetry in the resolver ou

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Matricciani, Emilio, and Carlo Riva. "Transfer Functions and Linear Distortions in Ultra-Wideband Channels Faded by Rain in GeoSurf Satellite Constellations." Future Internet 15, no. 1 (2023): 27. http://dx.doi.org/10.3390/fi15010027.

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Because of rain attenuation, the equivalent baseband transfer function of large bandwidth radio-links will not be ideal. We report the results concerning radio links to/from satellites orbiting in GeoSurf satellite constellations located at Spino d’Adda, Prague, Madrid, and Tampa, which are all sites in different climatic regions. By calculating rain attenuation and phase delay with the Synthetic Storm Technique, we have found that in a 10-GHz bandwidth centered at 80 GHz (W-Band)—to which we refer to as “ultra-wideband-, both direct and orthogonal channels will introduce significant amplitude

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Magauer, Andreas, and Soumitro Banerjee. "Transmission of Binary Information with a Chaos Coded Communication System using QDPSK-Modulation." Zeitschrift für Naturforschung A 53, no. 12 (1998): 1022–28. http://dx.doi.org/10.1515/zna-1998-1215.

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Abstract Synchronisation of chaotic oscillators offers a way of practical application of the theory of Chaos in obtaining secure communication. In this work we introduce a nonautonomous chaotic system with sinusoidal external force for communication of binary signals. The information is applied to the phase position of the sinusoidal forcing signal of the chaotic oscillator using a quadrature difference phase shift keying (QDPSK) modulation. An inverse synchronisation system approach with direct modulation is applied. We describe the system in detail and discuss the requirements of a secure co

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Turovsky, O. L., and L. A. Kirpach. "EFFECT OF PHASE INSTABILITY OF GENERATORS ON THE OPERATING PARAMETERS OF A CARRIER FREQUENCY SYNCHRONIZATION SYSTEM AGAINST A BACKGROUND OF ADDITIVE GAUSSIAN NOISE AND A DOPPLER FREQUENCY SHIFT." Collection of scientific works of the Military Institute of Kyiv National Taras Shevchenko University, no. 67 (2020): 62–71. http://dx.doi.org/10.17721/2519-481x/2020/67-07.

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The article deals with the systems of phase synchronization of radio engineering devices of communication technology. The purpose of the article is theoretical research in the direction of development, analysis and improvement of known and synthesis of new phase synchronization circuits, characterized by high noise immunity, accuracy and speed with simplicity of design. The problem is solved to investigate the possibilities of closed and combined synchronization systems for operation under conditions of phase instability of generators in a communication channel against the background of extern

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Jabir, M. V., N. Fajar R. Annafianto, I. A. Burenkov, M. Dagenais, A. Battou, and S. V. Polyakov. "Versatile quantum-enabled telecom receiver." AVS Quantum Science 5, no. 1 (2023): 015001. http://dx.doi.org/10.1116/5.0123880.

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We experimentally demonstrate a quantum-measurement-based receiver for a range of modulation schemes and alphabet lengths in a telecom C-band. We attain symbol error rates below the shot noise limit for all the studied modulation schemes and the alphabet lengths [Formula: see text]. In doing so, we achieve the record energy sensitivity for telecom receivers. We investigate the trade-off between energy and bandwidth use and its dependence on the alphabet length. We identify the combined (energy and bandwidth) resource efficiency as a figure of merit and experimentally confirm that the quantum-i

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Ershadi, S. E., A. Keshtkar, A. Bayat, A. H. Abdelrahman, and H. Xin. "Rotman lens design and optimization for 5G applications." International Journal of Microwave and Wireless Technologies 10, no. 9 (2018): 1048–57. http://dx.doi.org/10.1017/s1759078718000934.

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AbstractThe next generation of wireless networks (5G) employs directional transmission at millimeter wave (mmW) frequencies to provide higher bandwidth and faster data rates. This is achieved by applying antenna arrays with proper beam steering capabilities. Rotman lens has long been used as a lens-based beamformer in electronically scanned arrays and its efficient design is important in the overall performance of the array. Minimizing the phase error on the aperture of the antenna array is an important design criterion in the lens. In this paper, a 7 × 8 wideband Rotman lens is designed. Part

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Ma, Chunjiang, Xiaomei Tang, Zhicheng Lv, Zhibin Xiao, and Guangfu Sun. "High-Precision Pseudo-Noise Ranging Based on BOC Signal: Zero-Bias Mitigation Methods." Applied Sciences 9, no. 15 (2019): 3162. http://dx.doi.org/10.3390/app9153162.

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In high precision applications based on binary subcarrier offset (BOC) signals, zero-bias of the digital discriminator is an error of importance. Unlike the thermal noise error, zero-bias is a fixed deviation that is challenging to eliminate by filtering in the time domain. In this paper, a statistical error analysis model for the zero-bias of BOC signal’s digital phase discriminator is established. The evaluation of the zero-bias is inseparable from the spreading code sequence and the initial phase of the signal through defining the concept of statistics maximum and statistics standard deviat

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Soyjaudah, K. M. S., and M. A. Hosany. "Combined Huffman Code and Generalized Array Codes Employing Phase/Frequency Modulation." Journal of Circuits, Systems and Computers 12, no. 01 (2003): 93–109. http://dx.doi.org/10.1142/s0218126603000866.

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The authors present a simple technique to combine source coding, channel coding and modulation. This technique employs the Huffman code for source coding, Generalized Array Codes (GAC) for channel coding and Phase/Frequency (BFSK/MPSK) for modulation. The combined scheme has the advantage of reducing the redundancy, providing error protection and simultaneously optimizing on channel bandwidth. It is shown the combined system gives the same performance as its separate counterparts but has lower complexity. The algorithm used to construct the combined trellis decoder employing phase/frequency fo

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Zhang, Zhe, MaoLiu Lin, QingHua Xu, and JiuBin Tan. "Accurate and robust estimation of phase error and its uncertainty of 50 GHz bandwidth sampling circuit." Science in China Series F: Information Sciences 50, no. 6 (2007): 905–14. http://dx.doi.org/10.1007/s11432-007-0062-1.

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Chen, Zhe, Debin Hou, Ji-Xin Chen, et al. "A K-Band FMCW Frequency Synthesizer Using Q-Boosted Switched Inductor VCO in SiGe BiCMOS for 77 GHz Radar Applications." Electronics 9, no. 11 (2020): 1933. http://dx.doi.org/10.3390/electronics9111933.

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In this article, a fractional-N phase-locked loop (PLL) with integrated chirp generation circuit block for a 76~81 GHz frequency-modulated continuous-wave (FMCW) radar system is presented. Thanks to the switched inductor voltage-controlled oscillator (VCO) topology, the linearity, phase noise, chirp bandwidth, and chirp rate of the FMCW synthesizer can be optimized for the short-range radar (SRR) and long-range radar (LRR) applications, with switch at ON/OFF states, respectively, according to different requirements and concerns. In this way, the proposed FMCW synthesizer shows improved phase n

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Lee, Kyeong Ha, Seung Guk Baek, Hyouk Ryeol Choi, Hyungpil Moon, Sang-Hoon Ji, and Ja Choon Koo. "Feedforward model-inverse position control of three-stage servo-valve using zero magnitude error tracking control." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 7 (2018): 2340–48. http://dx.doi.org/10.1177/0954406218786533.

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Three-stage servo-valves are popularly used in hydraulic systems that require large flow rate and high pressure. For a proper control of flow direction and flow rate fed into a hydraulic actuator, securing a proper position control bandwidth is a critical task for the servo-valve. In this paper, a set of popular control methods are systematically studied and a control method is selected. It is proven that the feedforward model-inverse control is the most effective method in terms of the control bandwidth. In the present work, the feedforward closed-loop architecture is adopted and the closed-l

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WOO, YOUNGSHIN, YOUNG MIN JANG, and MAN YOUNG SUNG. "A NOVEL METHOD FOR HIGH-PERFORMANCE PHASE-LOCKED LOOP." Journal of Circuits, Systems and Computers 13, no. 01 (2004): 53–63. http://dx.doi.org/10.1142/s0218126604001271.

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In this paper, we propose a phase-locked loop (PLL) with dual PFDs and a modified loop filter in which advantages of both PFDs can be combined and the trade-off between acquisition behavior and locked behavior can be achieved. By operating the appropriate PFD connected to the well-adjusted charge pump and regulating the loop bandwidth to input frequency ratio with an input divider and a modified loop filter, an unlimited error detection range, a high frequency operation, a reduced dead zone and a higher speed lock-up time can be achieved. The proposed PLL structure is designed using 1.5 μm CMO

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Hargreaves, Neil D. "Air‐gun signatures and the minimum‐phase assumption." GEOPHYSICS 57, no. 2 (1992): 263–71. http://dx.doi.org/10.1190/1.1443239.

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The air‐gun array signature is close to minimum‐phase as a function of continuous time, in the sense that for processing purposes its phase spectrum can be derived from the Hilbert transform of the logarithm of its amplitude spectrum. This phase spectrum is different, however, from the minimum‐phase spectrum that is estimated by spiking deconvolution for a sampled and time‐windowed version of the signature. As a consequence, there can be large phase errors when spiking deconvolution is applied to an air‐gun signature or to a recording instrument response. The errors can be shown to consist pri

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Musch, T., and B. Schiek. "A Fractional Ramp Generator with Improved Linearity and Phase-Noise Performance for the Use in Heterodyne Measurement Systems." Advances in Radio Science 3 (May 12, 2005): 75–81. http://dx.doi.org/10.5194/ars-3-75-2005.

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Abstract. Concepts for the generation and the measurement of highly linear frequency ramps are presented. The fractional ramp synthesiser concept shown here is able to generate frequency ramps with a very low phase noise level, a very good frequency linearity and reproducibility. Related to the bandwidth of the generated frequency ramps of 4.5 GHz a relative linearity error below 4·10–10 is demonstrated in a prototype system. This linearity error is close to the limit set by the phase noise floor of the ramp generators and marks a significant improvement over existing aproaches (Musch and Schi

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Liu, Feng, and Dong Po Ren. "An Improved TCP Congestion Control Algorithm in High Speed Satellite Links." Applied Mechanics and Materials 667 (October 2014): 129–32. http://dx.doi.org/10.4028/www.scientific.net/amm.667.129.

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The throughput of traditional TCP degrades drastically in high speed satellite links, where the characteristics of long round trip time (RTT) and high bit error rate (BER) happen together. Two typical improved algorithms, Hybla and Westwood, are designed to solve the problems of long RTT and high BER respectively. TCP-HW which combines the advantages of Hybla and Westwood is proposed in this paper, on the basis of consideration of both long RTT and high BER. At slow start and congestion avoidance phase, TCP-HW adopts a radical congestion window (cwnd) growth policy to eliminate the low data tr

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Cheng, Xiang, Shun Xu, Yan Liu, Yingchao Cao, Huikai Xie, and Jinhui Ye. "Development of an Optoelectronic Integrated Sensor for a MEMS Mirror-Based Active Structured Light System." Micromachines 14, no. 3 (2023): 561. http://dx.doi.org/10.3390/mi14030561.

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Micro-electro-mechanical system (MEMS) scanning micromirrors are playing an increasingly important role in active structured light systems. However, the initial phase error of the structured light generated by a scanning micromirror seriously affects the accuracy of the corresponding system. This paper reports an optoelectronic integrated sensor with high irradiance responsivity and high linearity that can be used to correct the phase error of the micromirror. The optoelectronic integrated sensor consists of a large-area photodetector (PD) and a receiving circuit, including a post amplifier, a

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Boiko, Juliy, and Oleksander Eromenko. "Signal Processing in Telecommunications with Forward Correction of Errors." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 3 (2018): 868. http://dx.doi.org/10.11591/ijeecs.v11.i3.pp868-877.

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<span lang="IN">The development of mechanisms of increase efficiency of frequency-shift keying signals processing in telecommunications using algorithms of noise immunity channel coding in obstacle effect conditions is held in the article. The synthesis of the frequency-shift keying signal processing unit accounting intersymbol communication which is inherent for such signals with continuous phase is held. The conditions of the compromise implementation in the telecommunication information transmission channel with frequency shift keying and error correction coding for setting the optima

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Liu, Wei, Hongqiang Wang, Qi Yang, Bin Deng, Lei Fan, and Jun Yi. "High Precision Motion Compensation THz-ISAR Imaging Algorithm Based on KT and ME-MN." Remote Sensing 15, no. 18 (2023): 4371. http://dx.doi.org/10.3390/rs15184371.

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In recent years, terahertz (THz) radar has been widely researched for its high-resolution imaging. However, the traditional inverse synthetic aperture radar (ISAR) imaging algorithms in the microwave band perform unsatisfactorily in the THz band. Firstly, due to THz radar’s large bandwidth and short wavelength, the rotation of the target will result in serious space-varying(SV) range migration and space-varying phase error. Furthermore, it is challenging to accurately estimate the rotational velocity and compensate for phase errors in the presence of severe range migration effects. Therefore,

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