Artigos de revistas: "Tradeoff bandwidth"

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Avitzour, D. "SNR/bandwidth tradeoff in coherent radar sampling". IEEE Transactions on Aerospace and Electronic Systems 26, n.º 2 (março de 1990): 403–5. http://dx.doi.org/10.1109/7.53447.

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Akhlaghi, Soroush, Abbas Kiani e Mohammad Reza Ghanavati. "Cost-bandwidth tradeoff in distributed storage systems". Computer Communications 33, n.º 17 (novembro de 2010): 2105–15. http://dx.doi.org/10.1016/j.comcom.2010.07.022.

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Kleinrock, L. "The latency/bandwidth tradeoff in gigabit networks". IEEE Communications Magazine 30, n.º 4 (abril de 1992): 36–40. http://dx.doi.org/10.1109/35.135787.

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Chen, Li, Yuan Feng, Baochun Li e Bo Li. "Efficient Performance-Centric Bandwidth Allocation with Fairness Tradeoff". IEEE Transactions on Parallel and Distributed Systems 29, n.º 8 (1 de agosto de 2018): 1693–706. http://dx.doi.org/10.1109/tpds.2018.2808202.

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Barakat, Chadi, e Eitan Altman. "Bandwidth tradeoff between TCP and link-level FEC". Computer Networks 39, n.º 2 (junho de 2002): 133–50. http://dx.doi.org/10.1016/s1389-1286(01)00305-x.

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Sanders, Peter, e Jop F. Sibeyn. "A bandwidth latency tradeoff for broadcast and reduction". Information Processing Letters 86, n.º 1 (abril de 2003): 33–38. http://dx.doi.org/10.1016/s0020-0190(02)00473-8.

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Oyman, Ozgur, e Arogyaswami Paulraj. "Power-Bandwidth Tradeoff in Dense Multi-Antenna Relay Networks". IEEE Transactions on Wireless Communications 6, n.º 6 (junho de 2007): 2282–93. http://dx.doi.org/10.1109/twc.2007.05815.

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Sirleto, L., M. A. Ferrara e A. Vergara. "Toward an ideal nanomaterial for on-chip Raman laser". Journal of Nonlinear Optical Physics & Materials 26, n.º 03 (setembro de 2017): 1750039. http://dx.doi.org/10.1142/s0218863517500394.

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One of the most important applications of stimulated Raman scattering (SRS) is the realization of amplifiers or laser sources in bulk materials, in fiber and in integrated optic format as well. We note that, as a general rule, in all laser gain bulk materials, there is a tradeoff between gain and bandwidth: line width may be increased at the expense of peak gain. This tradeoff is a fundamental limitation toward the realization of micro/nano-sources with large emission spectra. In this paper, in order to clarify the possibility of obtaining new materials with both large Raman gain coefficients and spectral bandwidth, SRS investigations in nanostructures, spanning from nanometrically heterogeneous K2O–Nb2O5SiO2 (KNS) glasses to Si nanocrystals, are reported and discussed.

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Zhao, Mingfei, Yunlong Hu e Jia Song. "Improved Fractional-Order Extended State Observer-Based Hypersonic Vehicle Active Disturbance Rejection Control". Mathematics 10, n.º 23 (23 de novembro de 2022): 4414. http://dx.doi.org/10.3390/math10234414.

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In this work, a novel fractional-order extended state observer (FOESO)-based linear active disturbance rejection control (LADRC) method is firstly proposed for a hypersonic vehicle (HV) to address the measurement noise problem. The uncertainty and external disturbance of an HV was discussed and addressed by the active disturbance rejection control and many different control methods in recent decades. However, the research of an HV with measurement noise is insufficient. For the LADRC, the anti-noise ability is highly dependent on the bandwidth of the extended state observer (ESO). Meanwhile, the control performance of the LADRC is relevant to the bandwidth. The FOESO is presented, aiming to address the tradeoff of the control performance or noise suppression. The FOESO-based LADRC (FOESO-LADRC) introduces fractional calculus. It can enhance the anti-noise ability with little influence on the control performance. The simulation results show that the FOESO-LADRC has a significant improvement in the noise suppression. In addition, compared with the LADRC, it obtains a better solution to address the tradeoff between the bandwidth and noise impact.

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Tamoor-ul-Hassan, Syed, Mehdi Bennis, Pedro H. J. Nardelli e Matti Latva-aho. "Caching in Wireless Small Cell Networks: A Storage-Bandwidth Tradeoff". IEEE Communications Letters 20, n.º 6 (junho de 2016): 1175–78. http://dx.doi.org/10.1109/lcomm.2016.2543698.

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Bae, Changhun, e Wayne E. Stark. "End-to-End Energy–Bandwidth Tradeoff in Multihop Wireless Networks". IEEE Transactions on Information Theory 55, n.º 9 (setembro de 2009): 4051–66. http://dx.doi.org/10.1109/tit.2009.2025556.

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Chen, Chih-Liang, Wayne E. Stark e Sau-Gee Chen. "Energy-Bandwidth Efficiency Tradeoff in MIMO Multi-Hop Wireless Networks". IEEE Journal on Selected Areas in Communications 29, n.º 8 (setembro de 2011): 1537–46. http://dx.doi.org/10.1109/jsac.2011.110904.

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Ito, Shingo, Mathias Poik, Johannes Schlarp e Georg Schitter. "Atomic Force Microscopy Breaking Through the Vertical Range-Bandwidth Tradeoff". IEEE Transactions on Industrial Electronics 68, n.º 1 (janeiro de 2021): 786–95. http://dx.doi.org/10.1109/tie.2020.2982113.

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Arisaka, Momo, e Shinya Sugiura. "Energy-Versus-Bandwidth-Efficiency Tradeoff in Spatially Modulated Massive MIMO Downlink". IEEE Wireless Communications Letters 8, n.º 1 (fevereiro de 2019): 197–200. http://dx.doi.org/10.1109/lwc.2018.2866470.

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Yang, Xue-Xia, Guan-Nan Tan, Bing Han e Hai-Gao Xue. "Millimeter Wave Fabry-Perot Resonator Antenna Fed by CPW with High Gain and Broadband". International Journal of Antennas and Propagation 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3032684.

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A novel millimeter wave coplanar waveguide (CPW) fed Fabry-Perot (F-P) antenna with high gain, broad bandwidth, and low profile is reported. The partially reflective surface (PRS) and the ground form the F-P resonator cavity, which is filled with the same dielectric substrate. A dual rhombic slot loop on the ground acts as the primary feeding antenna, which is fed by the CPW and has broad bandwidth. In order to improve the antenna gain, metal vias are inserted surrounding the F-P cavity. A CPW-to-microstrip transition is designed to measure the performances of the antenna and extend the applications. The measured impedance bandwidth ofS11less than −10 dB is from 34 to 37.7 GHz (10.5%), and the gain is 15.4 dBi at the center frequency of 35 GHz with a 3 dB gain bandwidth of 7.1%. This performance of the antenna shows a tradeoff among gain, bandwidth, and profile.

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Park, Sanghyeok, e Jinkyu Lee. "Analysis of the K2 Scheduler for a Real-Time System with an SSD". Electronics 10, n.º 7 (6 de abril de 2021): 865. http://dx.doi.org/10.3390/electronics10070865.

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While an SSD (Solid State Drive) has been widely used for storage in many computing systems due to its small average latency, how to provide timing guarantees of a delay-sensitive (real-time) task on a real-time system equipped with an SSD has not been fully explored. A recent study has proposed a work-constraining I/O scheduler, called K2, which has succeeded in reducing the tail latency of a real-time task at the expense of compromising the total bandwidth for real-time and non-real-time tasks. Although the queue length bound parameter of the K2 scheduler is a key to regulate the tradeoff between a decrease in the tail latency of a real-time task and an increase in penalty of the total bandwidth, the parameter’s impact on the tradeoff has not been thoroughly investigated. In particular, no studies have addressed how the case of a fully occupied SSD that incurs garbage collection changes the performance of the K2 scheduler in terms of the tail latency of the real-time task and the total bandwidth. In this paper, we systematically analyze the performance of the K2 scheduler for different I/O operation types, based on experiments on Linux. We investigate how the performance is changed on a fully occupied SSD due to garbage collection. Utilizing the investigation, we draw general guidelines on how to select a proper setting of the queue length bound for better performance. Finally, we propose how to apply the guidelines to achieve target objectives that optimize the tail latency of the real-time task and the total bandwidth at the same time, which has not been achieved by previous studies.

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del Notario, Carolina Blanch Perez, Rogier Baert e Maja D'Hondt. "Multi-Objective Genetic Algorithm for Task Assignment on Heterogeneous Nodes". International Journal of Digital Multimedia Broadcasting 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/716780.

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Task assignment in grid computing, where both processing and bandwidth constraints at multiple heterogeneous devices need to be considered, is a challenging problem. Moreover, targeting the optimization of multiple objectives makes it even more challenging. This paper presents a task assignment strategy based on genetic algorithms in which multiple and conflicting objectives are simultaneously optimized. Specifically, we maximize task execution quality while minimizing energy and bandwidth consumption. Moreover, in our video processing scenario; we consider transcoding to lower spatial/temporal resolutions to tradeoff between video quality; processing, and bandwidth demands. The task execution quality is then determined by the number of successfully processed streams and the spatial-temporal resolution at which they are processed. The results show that the proposed algorithm offers a range of Pareto optimal solutions that outperforms all other reference strategies.

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Abdulwali, Zaed S. A., Ali H. Alqahtani, Yosef T. Aladadi, Majeed A. S. Alkanhal, Yahya M. Al-Moliki, Khaled Aljaloud e Mohammed Thamer Alresheedi. "Miniaturized Broadband Bi-Yagi Antenna Array for Ambient RF Energy Harvesting". Micromachines 14, n.º 12 (30 de novembro de 2023): 2181. http://dx.doi.org/10.3390/mi14122181.

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This paper presents a miniaturized broadband Bi-Yagi antenna array that covers a bandwidth from 1.79 GHz to 2.56 GHz. The proposed antenna achieves a tradeoff between maximizing bandwidth, effective area, and gain while minimizing physical dimensions. The antenna design considers the coupling between the radiator and director elements, resulting in increased bandwidth as the resonating modes shift apart. Additionally, the proposed design optimizes element spacing and dimensions to achieve high gain, wide bandwidth, efficient radiation, and a minimum aperture size. The proposed antenna, with physical dimensions of 138.6 mm × 47.7 mm × 1.57 mm, demonstrates gains ranging from 6.2 dBi to 9.34 dBi across the frequency range, with a total efficiency between 88% and 98%. The proposed design is experimentally validated by measuring the reflection coefficients, input impedance, gain, and normalized radiation pattern. These features make the antenna well suited for capturing and harvesting electromagnetic waves in mobile wireless and Wi-Fi applications.

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Pan, Wen Sheng, Chuan Hui Ma, Shi Hai Shao e You Xi Tang. "A 2.5GHZ-2.7GHz Unsymmetrical Doherty Power Amplifier with Digital Predistortion for LTE-Advanced Applications". Advanced Materials Research 760-762 (setembro de 2013): 546–50. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.546.

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An unsymmetrical GaN based Doherty power amplifier (DPA) operating from 2.5GHz to 2.7GHz is presented in this paper. To achieve a good tradeoff among the output power, efficiency and bandwidth, the ladder-type multisection output matching networks are optimized for the carrier amplifier and the peaking amplifier, respectively. Measured with continuous wave (CW) signal, the broadband DPA provides more than 49dBm saturation power in the operating band. The drain efficiency is greater than 44% over 7dB back-off power. For a LTE-Advanced signal with 100MHz bandwidth, the drain efficiency is higher than 42% at an average output power of 41dBm, along with an adjacent channel leakage ratio (ACLR) of better than-49.9dBc after digital predistortion (DPD).

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Arka, Israna Hossain, Musab Ahmad Mohammad Al-Tarawni e J. S. Mandeep. "Cooperative Spectrum Sensing Performance-overhead Tradeoff in Cognitive Radio Network under Bandwidth Constraint". Research Journal of Applied Sciences, Engineering and Technology 6, n.º 23 (15 de dezembro de 2013): 4499–505. http://dx.doi.org/10.19026/rjaset.6.3458.

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Lv, Xiaojing, Withawat Withayachumnankul e Christophe Fumeaux. "Single-FSS-Layer Absorber With Improved Bandwidth–Thickness Tradeoff Adopting Impedance-Matching Superstrate". IEEE Antennas and Wireless Propagation Letters 18, n.º 5 (maio de 2019): 916–20. http://dx.doi.org/10.1109/lawp.2019.2905860.

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Kulkarni, Abhijit, e Vinod John. "Analysis of Bandwidth–Unit-Vector-Distortion Tradeoff in PLL During Abnormal Grid Conditions". IEEE Transactions on Industrial Electronics 60, n.º 12 (dezembro de 2013): 5820–29. http://dx.doi.org/10.1109/tie.2012.2236998.

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Cheng, Yongbo, Shiliang Xiao, Jianpo Liu, Feng Guo, Ronghua Qin, Baoqing Li e Xiaobing Yuan. "An approximate bandwidth allocation algorithm for tradeoff between fairness and throughput in WSN". Wireless Networks 24, n.º 6 (13 de fevereiro de 2017): 2165–77. http://dx.doi.org/10.1007/s11276-017-1458-5.

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Ismail, Ayman, e Mohamed Elmasry. "Analysis of the Flash ADC Bandwidth–Accuracy Tradeoff in Deep-Submicron CMOS Technologies". IEEE Transactions on Circuits and Systems II: Express Briefs 55, n.º 10 (outubro de 2008): 1001–5. http://dx.doi.org/10.1109/tcsii.2008.2001979.

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Ahmadi, Mahdieh, James Roberts, Emilio Leonardi e Ali Movaghar. "Cache Subsidies for an Optimal Memory for Bandwidth Tradeoff in the Access Network". IEEE Journal on Selected Areas in Communications 38, n.º 4 (abril de 2020): 736–49. http://dx.doi.org/10.1109/jsac.2020.2971806.

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Davis, T. L., e G. M. Jackson. "Reply by the authors to the Discussion by B. Biswas". GEOPHYSICS 54, n.º 3 (março de 1989): 406–7. http://dx.doi.org/10.1190/1.1486681.

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28 Hz geophones without a low‐cut filter provided a very similar amplitude (and phase) response to the 10 Hz geophones combined with a 25 Hz low‐cut filter. Combining 28 Hz geophones with a 15 or 20 Hz low‐cut filter would produce a record intermediate between Figure 4b and c. There is, however, a tradeoff between low‐frequency noise attenuation and the bandwidth of the seismic wavelet. Before stacking and deconvolution, the more severe low‐cut filtering produces dramatic noise reduction (Figure 4). After deconvolution and stacking, this improvement is much less dramatic. It was decided not to attenuate frequencies in the 10 to 25 Hz range too severely as this could decrease the signal bandwidth and provide a more “ringy,” if marginally cleaner, section.

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Shastri, Kunal, e Francesco Monticone. "Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses". EPJ Applied Metamaterials 9 (2022): 16. http://dx.doi.org/10.1051/epjam/2022012.

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Optical systems with wide field-of-views (FOV) are crucial for many applications such as high performance imaging, optical projection, augmented/virtual reality, and miniaturized medical imaging tools. Typically, aberration-free imaging with a wide FOV is achieved by stacking multiple refractive lenses (as in a “fisheye” lens), adding to the size and weight of the optical system. Single metalenses designed to have a wide FOV have the potential to replace these bulky imaging systems and, moreover, they may be dispersion engineered for spectrally broadband operation. In this paper, we derive a fundamental bound on the spectral bandwidth of dispersion-engineered wide-FOV achromatic metalenses. We show that for metalenses with a relatively large numerical aperture (NA), there is a tradeoff between the maximum achievable bandwidth and the FOV; interestingly, however, the bandwidth reduction saturates beyond a certain FOV that depends on the NA of the metalens. These findings may provide important information and insights for the design of future wide-FOV achromatic flat lenses.

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Fuhong, Lin, Liu Qian, Zhou Xianwei, Chen Yueyun e Huang Daochao. "Cooperative differential game for model energy-bandwidth efficiency tradeoff in the Internet of Things". China Communications 11, n.º 1 (janeiro de 2014): 92–102. http://dx.doi.org/10.1109/cc.2014.6821311.

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Lee, Hyuk, e Jungwoo Lee. "An Outer Bound on the Storage-Bandwidth Tradeoff of Exact-Repair Cooperative Regenerating Codes". IEEE Transactions on Information Theory 63, n.º 11 (novembro de 2017): 7267–82. http://dx.doi.org/10.1109/tit.2017.2742947.

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Martin, Milo M. K., Pacia J. Harper, Daniel J. Sorin, Mark D. Hill e David A. Wood. "Using destination-set prediction to improve the latency/bandwidth tradeoff in shared-memory multiprocessors". ACM SIGARCH Computer Architecture News 31, n.º 2 (maio de 2003): 206–17. http://dx.doi.org/10.1145/871656.859642.

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Diamantopoulos, Nikolaos-Panteleimon (Pandelis), Suguru Yamaoka, Takuro Fujii, Hidetaka Nishi, Koji Takeda, Tai Tsuchizawa, Takaaki Kakitsuka e Shinji Matsuo. "47.5 GHz Membrane-III-V-on-Si Directly Modulated Laser for Sub-pJ/bit 100-Gbps Transmission". Photonics 8, n.º 2 (27 de janeiro de 2021): 31. http://dx.doi.org/10.3390/photonics8020031.

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Near-future upgrades of intra data center networks and high-performance computing systems would require optical interconnects capable of operating at beyond 100 Gbps/lane. In order for this evolution to be achieved in a sustainable way, high-speed yet energy-efficient transceivers are in need. Towards this direction we have previously demonstrated directly-modulated lasers (DMLs) capable of operating at 50 Gbps/lane with sub-pJ/bit efficiencies based on our novel membrane-III-V-on-Si technology. However, there exists an inherent tradeoff between modulation speed and power consumption due to the carrier-photon dynamics in DMLs. In this work, we alleviate this tradeoff by introducing photon–photon resonance dynamics in our energy-efficient membrane DMLs-on-Si design and demonstrate a device with a maximum 3-dB bandwidth of 47.5 GHz. This denotes a bandwidth increase of more than 2x times compared to our previous membrane DMLs-on-Si. Moreover, the DML is capable of delivering 60-GBaud PAM-4 signals under Ethernet’s KP4-FEC threshold (net data rate of 113.42 Gbps) over 2-km of standard single-mode fiber transmission. DC energy-efficiencies of 0.17 pJ/bit at 25 °C and 0.34 pJ/bit at 50 °C have been achieved for the > 100-Gbps signals. Deploying such DMLs in an integrated multichannel transceiver should ensure a smooth evolution towards Terabit-class Ethernet links and on-board optics subsystems.

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Gao, Feifan, e Pak Kwong Chan. "A 0.5-V Four-Stage Amplifier Using Cross-Feedforward Positive Feedback Frequency Compensation". Chips 3, n.º 1 (30 de dezembro de 2023): 1–31. http://dx.doi.org/10.3390/chips3010001.

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This paper presents a low-voltage CMOS four-stage amplifier operating in the subthreshold region. The first design technique includes the cross-feedforward positive feedback frequency compensation (CFPFC) for obtaining better bandwidth efficiency in a low-voltage multi-stage amplifier. The second design technique incorporates both the bulk-drain-driven input stage topology in conjunction with a low-voltage attenuator to permit operation at a low voltage, and improves the input common-mode range (ICMR). The proposed circuit is implemented using TSMC-40 nm process technology. It consumes 0.866 μW at a supply voltage of 0.5 V. With a capacitive load of 50 pF, this four-stage amplifier can achieve 84.59 dB in gain, 161.00 kHz in unity-gain bandwidth, 96 deg in phase margin, and 5.7 dB in gain margin whilst offering an input-referred noise of 213.63 nV/Hz @1 kHz, small-signal power-bandwidth FoMss of 9.31 (MHz∙pF/μW), and noise-power per bandwidth-based FoMnpb of 1.15 × 10−6 ((µV/Hz)·µW/Hz). Compared to the conventional bulk-driven input stage design technique, it offers improved multi-parameter performance metrics in terms of noise, power, and bandwidth at a compromising tradeoff on ICMR with respect to bulk-driven amplifier design. Compared with conventional gate-source input stage design, it offers improved ICMR. The amplifier is useful for low-voltage analog signal-processing applications.

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Rahman, Mizanur, Mhafuzul Islam, Jon Calhoun e Mashrur Chowdhury. "Real-Time Pedestrian Detection Approach with an Efficient Data Communication Bandwidth Strategy". Transportation Research Record: Journal of the Transportation Research Board 2673, n.º 6 (7 de maio de 2019): 129–39. http://dx.doi.org/10.1177/0361198119843255.

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Vehicle-to-pedestrian communication could significantly improve pedestrian safety at signalized intersections. However, it is unlikely that pedestrians will typically be carrying a low latency communication-enabled device with an activated pedestrian safety application in their hand-held device all the time. Because of this, multiple traffic cameras at a signalized intersection could be used to accurately detect and locate pedestrians using deep learning, and broadcast safety alerts related to pedestrians to warn connected and automated vehicles around signalized intersections. However, the unavailability of high-performance roadside computing infrastructure and the limited network bandwidth between traffic cameras and the computing infrastructure limits the ability of real-time data streaming and processing for pedestrian detection. In this paper, we describe an edge computing-based real-time pedestrian detection strategy that combines a pedestrian detection algorithm using deep learning and an efficient data communication approach to reduce bandwidth requirements while maintaining high pedestrian detection accuracy. We utilize a lossy compression technique on traffic camera data to determine the tradeoff between the reduction of the communication bandwidth requirements and a defined pedestrian detection accuracy. The performance of the pedestrian detection strategy is measured in relation to pedestrian classification accuracy with varying peak signal-to-noise ratios. The analyses reveal that we detect pedestrians by maintaining a defined detection accuracy with a peak signal-to-noise ratio 43 dB while reducing the communication bandwidth from 9.82 Mbits/sec to 0.31 Mbits/sec, a 31× reduction.

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Lo Presti, F., Zhi-Li Zhang, J. Kurose e D. Towsley. "Source time scale and optimal buffer/bandwidth tradeoff for heterogeneous regulated traffic in a network node". IEEE/ACM Transactions on Networking 7, n.º 4 (1999): 490–501. http://dx.doi.org/10.1109/90.793004.

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Wong, Yi Jie, Mau-Luen Tham, Ban-Hoe Kwan e Yasunori Owada. "FedDdrl: Federated Double Deep Reinforcement Learning for Heterogeneous IoT with Adaptive Early Client Termination and Local Epoch Adjustment". Sensors 23, n.º 5 (23 de fevereiro de 2023): 2494. http://dx.doi.org/10.3390/s23052494.

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Federated learning (FL) is a technique that allows multiple clients to collaboratively train a global model without sharing their sensitive and bandwidth-hungry data. This paper presents a joint early client termination and local epoch adjustment for FL. We consider the challenges of heterogeneous Internet of Things (IoT) environments including non-independent and identically distributed (non-IID) data as well as diverse computing and communication capabilities. The goal is to strike the best tradeoff among three conflicting objectives, namely global model accuracy, training latency and communication cost. We first leverage the balanced-MixUp technique to mitigate the influence of non-IID data on the FL convergence rate. A weighted sum optimization problem is then formulated and solved via our proposed FL double deep reinforcement learning (FedDdrl) framework, which outputs a dual action. The former indicates whether a participating FL client is dropped, whereas the latter specifies how long each remaining client needs to complete its local training task. Simulation results show that FedDdrl outperforms the existing FL scheme in terms of overall tradeoff. Specifically, FedDdrl achieves higher model accuracy by about 4% while incurring 30% less latency and communication costs.

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Saad, Mohamed. "Optimal Multicommodity Spectrum-Efficient Routing in Multihop Wireless Networks". Wireless Communications and Mobile Computing 2018 (9 de julho de 2018): 1–11. http://dx.doi.org/10.1155/2018/7985756.

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Finding the route with maximum end-to-end spectral efficiency in multihop wireless networks has been subject to interest in the recent literature. All previous studies, however, focused on finding one route from a given source to a given destination under the constraint of equal bandwidth sharing. To the best of our knowledge, for the first time, this paper provides extensions to the multicommodity flow case, i.e., the case of multiple simultaneous source-destination (s-d) pairs. In particular, given an arbitrary number of s-d pairs, we address the problem of finding a route for every s-d pair such that the minimum spectral efficiency across all routes is maximized. We provide two alternative approaches, where one is based on fixed-sized time slots and the other is based on variable-sized time slots. For each approach, we derive the provably optimal routing algorithm. We also shed the light on the arising tradeoff between the complexity of network-layer route computation and the complexity of medium access control (MAC) layer scheduling of time slots, as well as the amenability to distributed implementation of our proposed algorithms. Our numerical results further illustrate the efficiency of the proposed approaches and their tradeoffs.

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Barkha Pandey, Raghu Harsh Kalia, Monica Kaushik e Monika Arora. "Performance Enhancement of DS-CDMA System using Extended BPSK Modulation Scheme". Journal on Today's Ideas - Tomorrow's Technologies 4, n.º 2 (28 de dezembro de 2016): 172–80. http://dx.doi.org/10.15415/jotitt.2016.42009.

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In a last few decades there has been tremendous growth and a drastic rise in wireless communication technologies. The major issue that the world is facing today with the advent of so many sophisticated wireless communication devices is efficient utilization of the spectrum. Spectrum efficiency comes together with a tradeoff factor of energy consumption. Thus, the need of the hour is an energy and bandwidth efficient technique. DS-CDMA is one of the competitive and most investigated technique in wireless communication which caters the large demand at the same time with limited bandwidth. Existing modulation techniques does not promise to provide better performance in case of higher noise. Therefore, one looks for a better BER stipulated modulation format to improve and enhance the performance of the system. This article revisits conventional Binary phase shift keying method and compares its performance in terms of BER with a special Extended Binary Phase Shift Keying (EBPSK) modulation format for a DS- CDMA system. EBPSK scheme is flexible and simple which is easily integrated in a network and assures improved and enhanced performance.

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Kim, Byungwook, e Sanggeun Jeon. "A Full Ka-Band CMOS Amplifier Using Inductive Neutralization with a Flat Gain of 13 ± 0.2 dB". Applied Sciences 12, n.º 9 (9 de maio de 2022): 4782. http://dx.doi.org/10.3390/app12094782.

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This paper presents a CMOS wideband amplifier operating in the full Ka-band, with a low gain variation. An inductive neutralization is applied to the amplifier to compensate for the gain roll-off in the high-frequency region. Neutralization inductance is carefully determined considering the tradeoff between stability and gain. To achieve a low gain variation over the full Ka-band, the amplifier employs the frequency staggering technique in which impedance matching for three gain stages is performed at different frequencies of 26, 34, and 42 GHz. The experimental results show that a peak gain of 13.2 dB is achieved at 39.2 GHz. The 3 dB bandwidth is from 23.5 to 41.7 GHz, which fully covers the Ka-band. Especially, the gain ripple of the amplifier is only 13 ± 0.2 dB over a wide bandwidth from 26.2 to 40.2 GHz. The input and output return loss values are better than −10 dB from 26.3 to 40.1 GHz and from 25.3 to 50 GHz, respectively. The DC power consumption is 18.6 mW.

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DOERING, ROBERT R. "System-on-Chip Integration". International Journal of High Speed Electronics and Systems 12, n.º 02 (junho de 2002): 325–32. http://dx.doi.org/10.1142/s0129156402001289.

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Numerous "signal-processing products" are now driving the semiconductor market for SOC solutions enabling real-time performance, low-cost, low-power, portability, etc. A primary limit on the types of electronic (or other) functions that will be integrated into future SOCs is cost of integration, which tends to grow non-linearly with process complexity and chip area. A near-continuum of System-on/in-X solutions is emerging between traditional System-on-Chip and System-on-Board. These approaches span the tradeoff between bandwidth and cost. For the foreseeable future, digital CMOS will continue to serve as a "host platform" for integrating a wide range of mechanical, optical, biological, and, perhaps, even "quantum" technologies.

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Kim, Ui-Jin, Min-Soo Song e Rae-Young Kim. "PCB-Based Current Sensor Design for Sensing Switch Current of a Nonmodular GaN Power Semiconductor". Energies 13, n.º 19 (3 de outubro de 2020): 5161. http://dx.doi.org/10.3390/en13195161.

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GaN-based power semiconductors exhibit small on-resistance and high dv/dt of the switch characteristics, thereby enabling the construction of high-efficiency, high-density semiconductor systems with fast switching and low power loss characteristics and miniaturization of passive devices. However, owing to the characteristics of GaN devices that result in them being significantly faster than other devices, the accuracy of the switching transient response significantly affects the noise or inductance in the device. Therefore, securing sufficient sensor bandwidth is considerably important for accurate current measurement in GaN-based devices. Conversely, the current sensor in the form of a non-insulated coil must secure sufficient bandwidth and overcome the tradeoff relationship with measurement sensitivity; moreover, the sensor configuration must be applicable to various power semiconductor types. This study proposes a current sensor model that applies the principle of the printed circuit board Rogowski coil to a surface mount device-type GaN-based half-bridge structure. This structure is applicable to a nonmodular power converter and is designed to secure sufficient bandwidth with a minimum area while simultaneously exhibiting high sensitivity. For the coil design, mutual inductances with existing coil structures were compared and analyzed, and the frequency response and magnetic analysis were evaluated. Experimental verification was performed and the transient response characteristics in various DC voltage ranges are discussed.

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Zahid, Tausif, Xiaojun Hei, Wenqing Cheng, Adeel Ahmad e Pasha Maruf. "On the Tradeoff between Performance and Programmability for Software Defined WiFi Networks". Wireless Communications and Mobile Computing 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/1083575.

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WiFi has become one of the major network access networks due to its simple technical implementation and high-bandwidth provisioning. In this paper, we studied software defined WiFi networks (SDWN) against traditional WiFi networks to understand the potential benefits, such as the ability of SDWN to effectively hide the handover delay between access points (AP) of the adoption of the SDWN architecture on WiFi networks and identify representative application scenarios where such SDWN approach could bring additional benefits. This study delineated the performance bottlenecks such as the throughput degradation by around 50% compared with the conventional WiFi networks. In addition, our study also shed some insights into performance optimization issues. All of the performance measurements were conducted on a network testbed consisting of a single basic service set (BSS) and an extended service set (ESS) managed by a single SDN controller deployed with various laboratory settings. Our evaluation included the throughput performance under different traffic loads with different number of nodes and packet sizes for both TCP and UDP traffic flows. Handover delays were measured during the roaming phase between different APs against the traditional WiFi networks. Our results have demonstrated the tradeoff between performance and programmability of software defined APs.

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42

Schwartz, Christian, Tobias Hoßfeld, Frank Lehrieder e Phuoc Tran-Gia. "Angry Apps: The Impact of Network Timer Selection on Power Consumption, Signalling Load, and Web QoE". Journal of Computer Networks and Communications 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/176217.

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The popularity of smartphones and mobile applications has experienced a considerable growth during the recent years, and this growth is expected to continue in the future. Since smartphones have only very limited energy resources, battery efficiency is one of the determining factors for a good user experience. Therefore, some smartphones tear down connectionsto the mobile network soon after a completed data transmission to reduce the power consumption of their transmission unit. However, frequent connection reestablishments caused by apps which send or receive small amounts of data often lead to a heavy signalling load within the mobile network. One of the major contributions of this paper is the investigation of the resulting tradeoff between energy consumption at the smartphone and the generated signalling traffic in the mobile network. We explain that this tradeoff can be controlled by the connection release timeout and study the impact of this parameter for a number of popular apps that cover a wide range of traffic characteristics in terms of bandwidth requirements and resulting signalling traffic. Finally, we study the impact of the timer settings on Quality of Experience (QoE) for web traffic. This is an important aspect since connection establishments not only lead to signalling traffic but also increase the load time of web pages.

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43

Shah, Nihar B., K. V. Rashmi, P. Vijay Kumar e Kannan Ramchandran. "Distributed Storage Codes With Repair-by-Transfer and Nonachievability of Interior Points on the Storage-Bandwidth Tradeoff". IEEE Transactions on Information Theory 58, n.º 3 (março de 2012): 1837–52. http://dx.doi.org/10.1109/tit.2011.2173792.

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Arnaud, Eric, Luc Duchesne, Kevin Elis, Jamil Fouany, Thierry Monediere e Marc Thevenot. "X-band compact choke horn antenna with circular polarization and isoflux pattern for nanosatellite applications". International Journal of Microwave and Wireless Technologies 8, n.º 3 (17 de abril de 2015): 651–59. http://dx.doi.org/10.1017/s1759078715000677.

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This paper presents a tradeoff between isoflux pattern quality and X-band antenna compactness for nanosatellite applications. Having an isoflux radiation and a circular polarization (CP) generally causes a large antenna size which is incompatible for these applications. A new design of an antenna is done with the following maximum antenna dimensions: a diameter of 90 mm and a height of 20 mm above the nanosatellite platform. The isoflux pattern is slightly degraded while a good CP and realized gain are kept. The structure is a compact choke horn. It presents an axial ratio lower than 3 dB and a RG close to 0 dB over a 400 MHz bandwidth (8.0–8.4 GHz). It has been realized and successfully measured.

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45

Xu, Yong, Jingrong Yu, Yijia Cao, Xiaonan Lu e Jiaqi Yu. "Double resonant output filter to eliminating the tradeoff between bandwidth and switching ripple in shunt active power filters". IET Power Electronics 9, n.º 4 (março de 2016): 846–54. http://dx.doi.org/10.1049/iet-pel.2015.0005.

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Quy, Vu Khanh, Pham Minh Chuan, Vi Hoai Nam, Dao Manh Linh, Nguyen Tien Ban e Nguyen Dinh Han. "A High-Performance Routing Protocol Based on Mobile Agent for Mobile Ad Hoc Networks". International Journal of Interactive Mobile Technologies (iJIM) 15, n.º 03 (12 de fevereiro de 2021): 30. http://dx.doi.org/10.3991/ijim.v15i03.13007.

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This paper presents a modification of a well-known routing protocol, namely Ad hoc On-Demand Distance Vector, as a solution to improve the performance of mobile ad hoc networks. We adapted the mobile agent technology as to novel metrics for routing in those networks. The metric is a function of the loss rate, the bandwidth and the end-to-end delay of the link. Indeed, we established a new tunable parameter to obtain a tradeoff between throughput and delay when computing the new metric. As a result, any routing protocol using this metric can al-ways choose a high-throughput and low-delay path between a source and a destination. Hence, the achievable performance of the mobile ad hoc networks has been improved remarkably with our modified routing protocol,

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Choi, Hojong. "Design of Preamplifier for Ultrasound Transducers". Sensors 24, n.º 3 (25 de janeiro de 2024): 786. http://dx.doi.org/10.3390/s24030786.

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In diagnostic ultrasound imaging applications, preamplifiers are used as first-stage analog front-end amplifiers for ultrasound transducers because they can amplify weak acoustic signals generated directly by ultrasound transducers. For emerging diagnostic ultrasound imaging applications, different types of preamplifiers with specific design parameters and circuit topologies have been developed, depending on the types of the ultrasound transducer. In particular, the design parameters of the preamplifier, such as the gain, bandwidth, input- or output-referred noise components, and power consumption, have a tradeoff relationship. Guidelines on the detailed design concept, design parameters, and specific circuit design techniques of the preamplifier used for ultrasound transducers are outlined in this paper, aiming to help circuit designers and academic researchers optimize the performance of ultrasound transducers used in the diagnostic ultrasound imaging applications for research directions.

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Ling, Mingxiang, Lei Yuan, Zhihong Luo, Tao Huang e Xianmin Zhang. "Enhancing Dynamic Bandwidth of Amplified Piezoelectric Actuators by a Hybrid Lever and Bridge-Type Compliant Mechanism". Actuators 11, n.º 5 (12 de maio de 2022): 134. http://dx.doi.org/10.3390/act11050134.

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Ongoing interests in high-speed precision actuation continuously sparks great attention on developing fast amplified piezoelectric actuators (APAs) with compliant mechanisms. A new type of APA with enhanced resonance frequency is herein reported based on a hybrid compliant amplifying mechanism. A two-stage displacement flexure amplifier is proposed by synthesizing the lever-type and semi bridge-type compliant mechanisms in a compact configuration, promising to a well tradeoff between the displacement amplification ratio and dynamic bandwidth. The static and dynamic performances are experimentally evaluated. The resonance frequency of 2.1 kHz, displacement amplification ratio of 6, and step response time of around 0.4 ms are realized with a compact size of 50 mm × 44 mm × 7 mm. Another contribution of this paper is to develop a comprehensive two-port dynamic stiffness model to predict the static and dynamic behaviors of the compliant amplifier. The modeling approach presented here differs from previous studies in that it enables the traditional transfer matrix method to formulate both the kinetostatics and dynamics of compliant mechanisms including serial-parallel branches and rigid bodies.

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Kukreja, Navjot, Jan Hückelheim, Mathias Louboutin, John Washbourne, Paul H. J. Kelly e Gerard J. Gorman. "Lossy checkpoint compression in full waveform inversion: a case study with ZFPv0.5.5 and the overthrust model". Geoscientific Model Development 15, n.º 9 (12 de maio de 2022): 3815–29. http://dx.doi.org/10.5194/gmd-15-3815-2022.

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Abstract. This paper proposes a new method that combines checkpointing methods with error-controlled lossy compression for large-scale high-performance full-waveform inversion (FWI), an inverse problem commonly used in geophysical exploration. This combination can significantly reduce data movement, allowing a reduction in run time as well as peak memory. In the exascale computing era, frequent data transfer (e.g., memory bandwidth, PCIe bandwidth for GPUs, or network) is the performance bottleneck rather than the peak FLOPS of the processing unit. Like many other adjoint-based optimization problems, FWI is costly in terms of the number of floating-point operations, large memory footprint during backpropagation, and data transfer overheads. Past work for adjoint methods has developed checkpointing methods that reduce the peak memory requirements during backpropagation at the cost of additional floating-point computations. Combining this traditional checkpointing with error-controlled lossy compression, we explore the three-way tradeoff between memory, precision, and time to solution. We investigate how approximation errors introduced by lossy compression of the forward solution impact the objective function gradient and final inverted solution. Empirical results from these numerical experiments indicate that high lossy-compression rates (compression factors ranging up to 100) have a relatively minor impact on convergence rates and the quality of the final solution.

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Shairi, Noor Azwan, Nursyahirah Mohd Sanusi, Adib Othman, Zahriladha Zakaria e Imran Mohd Ibrahim. "Performance analysis of Ultra-wideband RF switch using discrete PIN diode in SC-79 package for medical application of microwave imaging". International Journal of Electrical and Computer Engineering (IJECE) 9, n.º 6 (1 de dezembro de 2019): 4668. http://dx.doi.org/10.11591/ijece.v9i6.pp4668-4674.

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<span>Microwave imaging is an emerging technology in the medical application which have similar functions as X-ray, Magnetic Resonance Imaging (MRI), and Computed Tomography scan (CT scan). In designing a microwave imaging system for medical application, it can use a monostatic radar approach by transmitting a Gaussian pulse (with an ultra-wideband (UWB) frequency). In this system, eight antennas are required with the support of RF switches. Thus, it is important to get the best performance of UWB RF switch in this application. Therefore, this paper presents the performance analysis of four different RF switch topologies (Design 1, 2, 3 and 4) using discrete PIN diode in SC-79 package. The design was based on single pole double throw (SPDT) switch. As result, Design 2 is the best topology after considering the tradeoff between isolation and return loss performances. Based on the three cascaded SPDT switches of Design 2, the insertion loss was less than -2 dB and return loss was more than -10 dB. Meanwhile, the isolation bandwidth (at the minimum isolation of -20 dB) was from 0.5 to 3.7 GHz (with 3.2 GHz bandwidth), hence, it could be used in the UWB frequency for medical application of microwave imaging.</span>

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