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Neural shaping with joint optimization of controller and plant under restricted dynamics

Neural shaping with joint optimization of controller and pla...

引用

Information Theory and Applications Workshop, ITA

作者： Bryan D. He Lakshminarayan Srinivasan Department of Computer Science California Institute of Technology Pasadena CA USA Neural Signal Processing Laboratory University of California Los Angeles CA USA

The prototypical brain-computer interface (BCI) algorithm translates brain activity into changes in the states of a computer program, for typing or cursor movement. Most approaches use neural decoding which learns how the user has encoded their intent in their noisy neural signals. Recent adaptive decoders for cursor movement improved BCI performance by modeling the user as a feedback controller; when this model accounts for adaptive control, the neural decoder is termed co-adaptive. This recent collection of control-inspired neural decoding strategies disregards a major antecedent conceptual realization, whereby the user could be induced to adopt an encoding strategy (control policy) such that the encoder-decoder pair (or equivalently, controller-plant pair) is optimal under a desired cost function. We call this alternate conceptual approach neural shaping, in contradistinction to neural decoding. Previous work illuminated the general form of optimal controller-plant pair under a cost representing information gain. For BCI applications requiring the user to issue discrete-valued commands, the information-gain-optimal pair, based on the posterior matching scheme, can be user-friendly. In this paper, we discuss the application of neural shaping to cursor control with continuous-valued states based on continuous-valued user commands. We examine the problem of jointly optimizing controller and plant under quadratic expected cost and restricted linear plant dynamics. This simplification reduces joint controller-plant selection to a static optimization problem, similar to approaches in structural engineering and other areas. This perspective suggests that recent BCI approaches that alternate between adaptive neural decoders and static neural decoders could be local Pareto-optimal, representing a suboptimal iterative-type solution to the optimal joint controller-plant problem.

关键词： Decoding Noise Cost function Optimal control Encoding Algorithm design and analysis Joints

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Improved perturbation bounds for the continuous-time H∞-control problem

Improved perturbation bounds for the continuous-time H∞-con...

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作者： Christov, Nicolai D. Konstantinov, Mihail M. Petkov, Petko Hr. Laboratory of Automatics Computer Engineering and Signal Processing Lille University of Science and Technology Villeneuve d'Ascq59655 France Department of Mathematics University of Architecture Civil Engineering and Geodesy Sofia1046 Bulgaria Department of Systems and Control Technical University of Sofia Sofia1000 Bulgaria

New local perturbation bounds for the continuous-time H∞-control problem are obtained, which are nonlinear functions of the data perturbations and are tighter than the existing condition number-based local bounds. These nonlinear local bounds are then incorporated into nonlocal perturbation bounds which are less conservative than the existing nonlocal perturbation estimates for the H∞-control problem. Copyright © 2014, Kent State University.

关键词： Riccati equations

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Frequency-Hopping Period Estimation Based on Binary-Sum in Frequency Domain

Frequency-Hopping Period Estimation Based on Binary-Sum in F...

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Wireless Communication and Sensor Network, Intl Conference on

作者： Yan Qi Lu-Xi Lu Kun Zhang Nat. Key Lab. of Sci. & Technol. on Blind Signal Process. Chengdu China National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (纸本)9781479970926

Focusing on the estimation of the hopping period of the frequency-hopping (FH) signals, this paper proposes a novel method based on the binary-sum in the frequency domain. First, the time-frequency (TF) spectrograph of the signal is obtained and transformed into a binary matrix. Then the sum in frequency domain is calculated and the hopping period is accurately estimated by spectrum analyzing. The results of the simulations confirm that the method is effective and superior to the regular methods.

关键词： Estimation Frequency estimation Time-frequency analysis signal to noise ratio Accuracy

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Cost-sensitive three-way decisions model based on CCA

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作者： Zhang, Yanping Zou, Huijin Chen, Xi Wang, Xiangyang Tang, Xuqing Zhao, Shu Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education Hefei Anhui Province 230601 China School of Computer Science and Technology Anhui University Hefei Anhui Province 230601 China Anhui Electrical Engineering Professional Technique College Hefei Anhui Province 230051 China Jiangnan University Wuxi China

ISBN: (纸本)9783319086439

The concept of three-way decisions was proposed by Yao and most of three-way decisions models use two thresholds α and β to partition the universe into three parts: the positive region POS(X), the negative region NEG(X) and the boundary region BND(X). But acquirement of a pair of thresholds is a challenge. In this paper, we propose a new method to get the thresholds of three-way decisions model. We introduce loss function into three-way decisions model based on constructive covering algorithm (CCA). A loss function is interpreted as the costs of making classification decisions. More specifically, for reducing losses of classification, we change the radius of the cover according to the loss function, then we compute the thresholds based on the modification. This paper propose an effective method to compute thresholds α and β, which is according to cost-sensitive three-way decisions model based on CCA. © 2014 Springer International Publishing.

关键词： Costs

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Azimuth resolution improvement of spaceborne SAR images with nearly nonoverlapped doppler bandwidth

Azimuth resolution improvement of spaceborne SAR images with...

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IET International radar Conference 2013

作者： Liu, Yan-Yang Li, Zhen-Fang Suo, Zhi-Yong Bao, Zheng National Key Laboratory of Science and Technology on Radar Signal Processing Xidian Univ. Xi'an Shanxi 710071 China

ISBN: (纸本)9781849196031

This paper deals with the azimuth resolution improvement problems via the coherent combination of the SAR images with nearly zero-overlapped Doppler bandwidth, which corresponding to large along-track baseline. Prior to the combination of the images, the phase bias contributions from the atmospheric propagation delays and baseline measurement errors should be calibrated. The interferogram of the azimuth pre-filtered SAR images are adopted in the classical method, whose performance falls down when the overlapped spectra comes to zero. In this paper, the maximum sharpness optimization is adopted to deal this situation. The proposed method has been tested by processing the real data.

关键词： Synthetic aperture radar

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Robust point pattern matching based on spectral context

Robust point pattern matching based on spectral context

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作者： Tang, Jun Shao, Ling Zhen, Xiantong Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Huangshan Road Hefei 230039 China College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Department of Electronic and Electrical Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

Finding correspondences between two related feature point sets is a basic task in computer vision and pattern recognition. In this paper, we present a novel method for point pattern matching via spectral graph analysis. In particular, we aim to render the spectral matching algorithm more robust for positional jitter and outlier. A local structural descriptor, namely the spectral context, is proposed to describe the attribute domain of point sets, which is fundamentally different from the previous methods. Furthermore, the approximate distance order is defined and employed as the metric for geometric consistency of neighboring points in this work. By combining these two novel ingredients, we formulate feature point set matching as an optimization problem with one-to-one constraints. The correspondences are then obtained by maximizing the given objective function via the technique of probabilistic relaxation. Comparative experiments conducted on both synthetic and real data demonstrate the effectiveness of the proposed method, especially in the presence of positional jitter and outliers. © 2013 Elsevier Ltd. All rights reserved.

关键词： Jitter

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Delay-optimized offloading for mobile cloud computing services in heterogenous networks 4th

Delay-optimized offloading for mobile cloud computing servic...

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4th International Conference on Cloud Computing, CloudComp 2013

作者： Zheng, Kan Meng, Hanlin Zhu, Hua Lin, Kai Cai, Wei Long, Hang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing100088 China School of Computer Science and Engineering Dalian University of Technology Dalian Liaoning China Electrical and Computer University of British Columbia VancouverV6T 1Z4 Canada

ISBN: (纸本)9783319055053

Offloading is an efficient method for extending the lifetime and speeding up the execution rate of mobile devices by executing remotely in mobile cloud computing (MCC) networks. Meanwhile, heterogeneous network (HetNet), which has multiple types of radio access nodes in the network, is widely accepted as a promising way to satisfy the increased traffic demand. In this paper, we first propose two delayoptimized offloading control schemes in LTE-Advanced heterogeneous networks. One of them is to control the number of offloading users by setting a threshold. Another is to determine whether the users are suited to offload by estimating the execution delay. Both of them take the traffic load of serving cell and neighbouring cells into account. For comparison purpose, the delay performance of different schemes are evaluated by simulations in not only heterogeneous network but also macro-only network. © Institute for Computer sciences, Social Informatics and Telecommunications Engineering 2014.

关键词： Heterogeneous networks

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On the performance of hybrid satellite-terrestrial cooperative networks with interferences 48

On the performance of hybrid satellite-terrestrial cooperati...

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48th Asilomar Conference on signals, Systems and Computers, ACSSC 2015

作者： Lin, Min Ouyang, Jian Zhu, Wei-Ping PLA University of Science and Technology Nanjing210007 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Department of Electrical and Computer Engineering Concordia University MontrealQCH3G1M8 Canada

ISBN: (纸本)9781479982974

The paper investigates the performance of a hybrid satellite-terrestrial cooperative network (HSTCN), where some terrestrial amplify-and-forward (AF) relays are employed to assist the signal transmission from a satellite to a destination, which is corrupted by multiple co-channel interferences (CCIs). In this system, the satellite links undergo Shadowing-Rician fading while the terrestrial links experience Rayleigh fading. Specifically, by assuming that maximum ratio combining (MRC) is used at the destination, we first derive the moment generating function (MGF) of the output signal-to-interference-plus-noise ratio (SINR). With the help of MGF, we then present the analytical average symbol error rate (ASER) expression for the considered cooperative system. Moreover, to gain further insights, the asymptotic ASER analysis in terms of the diversity order and array gain is also developed. Finally, numerical results are given to demonstrate the validity of the performance analysis and the impacts of shadowing parameters, relay number and CCIs on the considered HSTCN. © 2014 IEEE.

关键词： Rayleigh fading

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Burst signal sorting based on the phase continuity

Burst signal sorting based on the phase continuity

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2012 International Conference on Emerging Technologies for Information Systems, Computing, and Management, ICM 2012

作者： Yan, Fangmin Li, Ming You, Ling Science and Technology on Blind Signal Processing Laboratory Chengdu China

ISBN: (纸本)9781461470090

This paper proposed a new algorithm for burst signal sorting. The proposed algorithm can be used to identify and locate TDMA users based on the continuity of carrier phase. In the proposed algorithm, the continuity of carrier phase between TDMA burst signals is evaluated according to their frequency deviations, initial phases and initial positions. Then burst signals are sorted based on their degree of continuity. The proposed algorithm is effective when researchers do not know the information which the burst carries. Some simulations and experiments in this paper show that the accurate rate of the proposed sorting algorithm is greater than 0.9 when the ES/N0 > 6 dB. Specially, and the performance is stable when the frequency deviation changes. © 2013 Springer science+Business Media New York.

关键词： Time division multiple access

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Size estimation of space target using cross-range profile 3

Size estimation of space target using cross-range profile

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2013 3rd International Conference on Computer science and Network technology, ICCSNT 2013

作者： Li, Long Sun, Tao Sun, Zhengbo Science and Technology on Blind Signal Processing Laboratory Chengdu China

ISBN: (纸本)9781479905614

The size estimation of space target is useful to help monitor the collision of space targets. The traditional methods cannot obtain accurate size of three-axis stabilized targets via narrow-band radar. This paper presents a new algorithm based on cross-range profile. Through single range cell motion compensation and cross-range scaling, we can finally make the estimation of cross-range length. Simulation results verify the effectiveness of the algorithm. © 2013 IEEE.

关键词： Motion compensation

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