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International Conference on Control and Automation (ICCA)

作者： Fan Hong S. S. Ge C. K. Pang T. H. Lee Z. Sun Data Storage Institute Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore College of Automation Science & Engineering South China University of Technology Guangzhou China

In this paper, we present an adaptive neuro-fuzzy controller design for a class of uncertain nonholonomic systems in the perturbed chained form with unknown virtual control coefficients and strong drift nonlinearities. The robust adaptive neuro-fuzzy control laws are developed using state scaling and backstepping. Semi-global uniform ultimate boundedness of all the signals in the closed-loop are guaranteed, and the system states are proven to converge to a small neighborhood of zero. The control performance of the closed-loop system is guaranteed by appropriately choosing the design parameters. By using fuzzy logic approximation, the proposed control is free of control singularity problem. An adaptive control based switching strategy is proposed to overcome the uncontrollability problem associated with x 0 (t 0 ) = 0.

关键词： Robust control Programmable control Adaptive control Control systems Nonlinear control systems Motion control Neural networks Automatic control Control nonlinearities Fuzzy logic

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A 5.9mW 50Mbps CMOS QPSK/O-QPSK transmitter employing injection locking for direct modulation

A 5.9mW 50Mbps CMOS QPSK/O-QPSK transmitter employing inject...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Shengxi Diao Yuanjin Zheng Yuan Gao Xiaojun Yuan Minkyu Je Chun-Huat Heng Institute of Microelectronics Agency for Science Technology and Research Singapore Institute of Microelectronics Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

ISBN: (纸本)9781424483006

900MHz QPSK/O-QPSK transmitter suitable for biomedical high quality imaging application is presented. The phase modulation is achieved by directly modifying the self-resonant frequency of a sub-harmonic injection-locked oscillator through capacitor bank switching. Due to the simplicity of the proposed architecture, implemented in 0.18μm CMOS technology, it consumes very low power of 3mW and 5.88mW with 1.2V and 1.4V supply voltages respectively, while transmitting at 50Mbps data rate. The transmitter can deliver output power of -3.3dBm at 1.4V supply with an EVM of 6.6%.

关键词： Phase shift keying Transmitters Capacitors Power demand Harmonic analysis Frequency modulation

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An optimized routing protocol for vehicular ad hoc networks

An optimized routing protocol for vehicular ad hoc networks

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IEEE Region 10 International Conference TENCON

作者： Huaqun Guo Firdaus B. Alias Thani Wai Choong Wong Yongdong Wu Institute of Infocomm Research Agency for Science Technology and Research Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore Institute of Infocomm Research Agency for Science Technology and Research (ASTAR) Singapore

The rise in the number of vehicles on the streets today has led to an increasing need for traffic safety on roads. The emerging vehicular ad hoc networks (VANETs) are fast becoming a reality and will enable a variety of applications for safety, traffic efficiency, driver assistance, as well as infotainment. In order to provide stable communication linkages between vehicles, a good routing protocol is needed. Currently, there are several routing protocols for mobile ad hoc networks (MANETs) which may be used to find the best route to the destination vehicle in VANETs. However, due to the difference in the characteristics of the two networks, mobility characteristics that are present in VANETs could be added into current MANET routing protocols, so as to allow the routing protocol to achieve a better routing performance by finding the best route to the destination vehicle. This paper presents the optimizations made to a MANET routing protocol and shows an increase in routing performance validated through simulations.

关键词： Routing protocols Routing Vehicles Ad hoc networks Object oriented modeling Mobile computing

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Nonlinear fiber based processing for high speed optical communication and sensor systems

Nonlinear fiber based processing for high speed optical comm...

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LEOS Summer Topical Meetings

作者： Changyuan Yu Jing Yang Junhao Hu Institute of Infocomm Research (I2R) Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore

We give a review of our recent research on nonlinear fiber based processing, including: multichannel 80-GHz pulse train generation; suppression of polarization sensitivity in SBS sensor; and long distance sensing syst... 详细信息

关键词： Optical fiber sensors Optical fiber polarization Optical fiber communication Nonlinear optics Scattering

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Performance investigation of the joint SPM compensation in a long-haul coherent dual-polarization QPSK system

Performance investigation of the joint SPM compensation in a...

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European Conference on Optical Communication (ECOC)

作者： Shaoliang Zhang Lei Xu Pooi Yuen Kam Changyuan Yu Ting Wang Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore NEC Laboratories of America Inc. Princeton NJ USA Institute of Infocomm Research Agency for Science Technology and Research (ASTAR) Singapore Singapore

The dynamic input power range resulting in BER-3 using our proposed joint-SPM compensation scheme can be increased by 0.4 dB and 1.2 dB, compared to separately compensate for SPM at either transmitter or receiver side.

关键词： Optical transmitters Optical fiber dispersion Receivers Optical fiber polarization Joints Dynamic range

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Tuning phone decoders for language identification

Tuning phone decoders for language identification

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： C.P. Santhosh Kumar Haizhou Li Rong Tong Pavel Matějka Lukáš Burget Jan Černocký ECE Department Amrita Viswavidyapeetham University Ettimadai India Institute for Infocomm Research ASTAR (Agency for Science Technology & Research) Singapore School of Computer Engineering Nanyang Technological University Singapore Speech@FIT Brno University of Technology Czech Republic

Phonotactic approach, phone recognition to be followed by language modeling, is one of the most popular approaches to language identification (LID). In this work, we explore how language identification accuracy of a phone decoder can be enhanced by varying acoustic resolution of the phone decoder, and subsequently how multiresolution versions of the same decoder can be integrated to improve the LID accuracy. We use mutual information to select the optimum set of phones for a specific acoustic resolution. Further, we propose strategies for building multilingual systems suitable for LID applications, and subsequently fine tune these systems to enhance the overall accuracy.

关键词： Decoding Mutual information Natural languages Hidden Markov models Neural networks Databases Speech recognition Educational programs

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Design and optimization of wafer bonding packaged microelectromechanical systems thermoelectric power generators with heat dissipation path

Journal of Vacuum Science & Technology B: Microelectronics a...

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Journal of Vacuum science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 2009年第3期27卷 1267-1271页

作者： Chengkuo Lee Jin Xie Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore and Institute of Microelectronics (IME) Agency for Science Technology and Research (ASTAR) 11 Science Park Road Singapore Science Park II Singapore 117685 Singapore Institute of Microelectronics (IME) Agency for Science Technology and Research (A*STAR)11 Science Park Road Singapore Science Park II Singapore 117685 Singapore

A new concept of microelectromechanical system based thermoelectric power generator (TPG) with unique heat dissipation path is investigated in this study. By using solder based wafer bonding technology, the authors can bond three pieces of wafers to form vacuum packaged TPG. According to the finite element method and analytical modeling results, the output power per area of device is derived as 68.6μW∕cm2 for temperature difference of about 6°C between two ends of thermocouple junctions. It shows that the proposed device concept is an effective and low cost approach to enhance the output voltage.

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Optimal Transmission for Dying Channels

Optimal Transmission for Dying Channels

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IEEE International Conference on Communications (ICC)

作者： M. Zeng R. Zhang S. Cui Department of Electrical and Computer Engineering Texas A and M University College Station TX USA Institute for Infocomm Research Agency for Science Technology and Research (ASTAR) Singapore

In this paper, we investigate the optimal transmission schemes for dying channels, which were introduced in (M. Zeng et al., 2008). The dying channels are resulted in wireless networks subject to random fatal impacts, e.g., sensor networks under sudden physical attacks or cognitive radio networks with unpredictable primary user occupancy. Due to the non-ergodic and delay- limited nature of a dying channel, the outage capacity is adopted as the performance metric. Firstly, we show that the optimal power allocation profile is non-increasing when fading gains are independently and identically distributed (i.i.d.). Secondly, when the fading gains over the blocks are the same, we prove that the optimal number of blocks over which a codeword should be spanned is K = 1. At last, we consider the case where uniform power allocation is utilized and fading gains are i.i.d. In this case, we derive the upper and lower bounds for the outage probability. Moreover, for the high signal-to-noise ratio (SNR) case with Rayleigh fading , we derive analytical results on the optimal number of coding blocks K. For the low SNR case, we show that repetition transmissions are approximately optimal.

关键词： Fading Delay Wireless sensor networks Rayleigh channels AWGN Capacity planning Cognitive radio Additive white noise Radio transmitters Communications Society

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Femtosecond laser irradiation for functional micro-/nanostructure fabrication

Femtosecond laser irradiation for functional micro-/nanostru...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Minghui Hong Zaichun Chen Min Tang Luping Shi Tow Chong Chong Department of Electrical & Computer Engineering National University of Singapore Singapore Data Storage Institute Agency for Science Technology and Research Singapore Data Storage Institute Agency for Science Technology and Research (ASTAR) Singapore

Femtosecond laser is a unique processing tool to make micro-/nanostructures on heat sensitive bio-polymer film & glass substrate, to create 3D structures inside glass, to achieve 20-nm nanostructuring and large-ar... 详细信息

ISBN: (纸本)9781424438303

关键词： Optical device fabrication Laser beams Ultrafast optics Glass computer numerical control Laser theory Substrates Biomedical optical imaging Nonlinear optics Optical films

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On Capacity Region of Two-Way Multi-Antenna Relay Channel with Analogue Network Coding

On Capacity Region of Two-Way Multi-Antenna Relay Channel wi...

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IEEE International Conference on Communications (ICC)

作者： R. Zhang C. C. Chai Y.-C. Liang S. Cui Institute for Infocomm Research Agency for Science Technology and Research (ASTAR) Singapore Institute for Infocomm Research Agency for Science Technology and Research Singapore Department of Electrical and Computer Engineering Texas A and M University TX USA

This paper studies the wireless two-way relay channel (TWRC), where two source nodes, S1 and S2, exchange information through an assisting relay node, R. It is assumed that R receives the sum signal from S1 and S2 in one time-slot, and then amplifies and forwards the received signal to both S1 and S2 in the next time-slot. By applying the principle of analogue network coding (ANC), each of S1 and S2 cancels the so-called "self-interference" in the received signal from R and then decodes the desired message. Assuming that S1 and S2 are each equipped with a single antenna and R with multi-antennas, this paper analyzes the capacity region of an ANC-based TWRC with linear processing (beamforming) at R. The capacity region contains all the achievable bidirectional rate-pairs of S1 and S2 under the given transmit power constraints at S1, S2, and R. We present the optimal relay beamforming structure as well as an efficient algorithm to compute the optimal beamforming matrix based on convex optimization techniques.

关键词： Relays Network coding Array signal processing Decoding Peer to peer computing Signal processing Symmetric matrices Communications Society Electronic mail USA Councils

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