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A multi-agent control framework for co-adaptation in brain-computer interfaces 13

A multi-agent control framework for co-adaptation in brain-c...

引用

Annual Conference on Neural Information Processing Systems

作者： Josh Merel Roy Fox Tony Jebara Liam Paninski Department of Neurobiology and Behavior Columbia University New York NY 10027 School of Computer Science and Engineering Hebrew University Jerusalem 91904 Israel Department of Computer Science Columbia University New York NY 10027 Department of Statistics Columbia University New York NY 10027

ISBN: (纸本)9781632660244

In a closed-loop brain-computer interface (BCI), adaptive decoders are used to learn parameters suited to decoding the user's neural response. Feedback to the user provides information which permits the neural tuning to also adapt. We present an approach to model this process of co-adaptation between the encoding model of the neural signal and the decoding algorithm as a multi-agent formulation of the linear quadratic Gaussian (LQG) control problem. In simulation we characterize how decoding performance improves as the neural encoding and adaptive decoder optimize, qualitatively resembling experimentally demonstrated closed-loop improvement. We then propose a novel, modified decoder update rule which is aware of the fact that the encoder is also changing and show it can improve simulated co-adaptation dynamics. Our modeling approach offers promise for gaining insights into co-adaptation as well as improving user learning of BCI control in practical settings.

关键词： Brain-Computer Interfaces decoders Computer interfaces decoding algorithm linear quadratic Gaussian control ENCODER model codes decoding simulating Awareness

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Reconstructing curves in three (and higher) dimensional space from noisy data 03

Reconstructing curves in three (and higher) dimensional spac...

引用

Proceedings of the thirty-fifth annual ACM symposium on Theory of computing

作者： Don Coppersmith Madhu Sudan IBM Thomas J. Watson Research Center Yorktown Heights New York Massachusetts Institute of Technology Cambridge MA

ISBN: (纸本)9781581136746

We consider the task of reconstructing a curve in constant dimensional space from noisy data. We consider curves of the form C = [(x,y1,•••,yc) | yj = pj(x)], where the pj's are polynomials of low degree. Given n points in (c+1)-dimensional space, such that t of these lie on some such unknown curve C while the other n-t are chosen randomly and independently, we give an efficient algorithm to recover the curve C and the identity of the good points. The success of our algorithm depends on the relation between n, t, c and the degree of the curve C, requiring t = Ω (n deg(C)) 1/(c+1). This generalizes, in the restricted setting of random errors, the work of Sudan (J. Complexity, 1997) and of Guruswami and Sudan (IEEE Trans. Inf. Th. 1999) that considered the case c=1.

关键词： algebraic codes error-correction maximum distance separable codes random errors decoding algorithm

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A reliable asynchronous protocol for VLC communications based on the rolling shutter effect

A reliable asynchronous protocol for VLC communications base...

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IEEE Global Communications Conference

作者： Julia Ferrandiz-Lahuerta Daniel Camps-Mur Josep Paradells-Aspas i2CAT Foundation UPC-Barcelona Tech

ISBN: (纸本)9781479959532

In this paper we introduce a novel reliable asyn-chronous protocol that allows to establish a VLC link between a LED luminary and an off-the-shelf smartphone. Our protocol and decoding algorithms benefit from the access to advanced camera settings available in the latest generations of mobile devices to outperform previous VLC designs in the state of the art. In particular, in the paper we provide an experimental evaluation using a commercial Nexus 5 device where it is shown how our designed prototype can achieve transmission speeds of up to 700 bps and operating distances of up to 3 meters. The previous performance figures have the potential to spark a wide set of novel applications.

关键词： variable length codes state of the art asynchronous protocol rolling shutter Mobile devices protocols decoding algorithm transmission speed Communication Research

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Accelerating and deceleratingmin-sum-based gear-shift LDPC decoders

Accelerating and deceleratingmin-sum-based gear-shift LDPC d...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： J. Andrade G. Falcao V. Silva Instituto de Telecomunicações University of Coimbra Portugal

ISBN: (纸本)9781467369985

Low-Density Parity-Check (LDPC) decoders typically implement a single decoding algorithm or update rule, which narrows down the design space of the decoder and maintains its overall simplicity. However, gear-shift techniques combine multiple decoding algorithms, update rules and quantization of the log-likelihood ratios (LLRs), allowing wider design space explorations as more parameters can be fine-tuned to a particular need. Gear-shift LDPC decoders have been shown to improve both the decoding throughput and the energy efficiency per bit decoded, while achieving similar capacity compared to traditional approaches that only use one algorithm. In this paper, we incorporate gear-shift techniques based on the Min-Sum algorithm (MSA) and Self-Corrected Min-Sum algorithm(SCMSA) using variable quantization steps. The proposed design allows bit error rate (BER) performances close to the more powerful SCMSA running only a selected number of iterations using the most powerful update rule.

关键词： Gear-Shift LDPC Codes Min-Sum Self-Correction low density parity check codes decoders acceleration Space Exploration Quantization decoding algorithm Energy efficiency

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A Signal Constellation for Pilotless Communications Over Wiener Phase Noise Channels

A Signal Constellation for Pilotless Communications Over Wie...

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IEEE Global Communications Conference

作者： Shachar Shayovitz Dan Raphaeli Dept. of EE-Systems Tel-Aviv University

ISBN: (纸本)9781479913510

In this contribution, we propose a signal constellation for the the phase noise channel which does not require pilots thus increasing the effective information rate in a communication system. This constellation does not present rotational symmetry thus enabling decoding algorithms such as SPA, to converge without the use of pilots. We will provide Bit Error Rate (BER) simulations which show the superiority of this constellation over standard MPSK with pilots. Moreover, we will provide a method to analyze any arbitrary signal constellation and provide a figure of merit for its performance when iterative decoding algorithms are used.

关键词： Phase noise Factor graph Tikhonov Phase slip Directional statistics Asymmetrical constellations Constellation diagram Phase noise Factor Graph Pilots CONSTELLATIONS decoding algorithm Information rates Rotational symmetry Communication Research

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EXPLOITING SPARSENESS OF BACKING-OFF LANGUAGE MODELS FOR EFFICIENT LOOK-AHEAD IN LVCSR

EXPLOITING SPARSENESS OF BACKING-OFF LANGUAGE MODELS FOR EFF...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： David Nolden Hermann Ney Ralf Schluter Human Language Technology and Pattern Recognition GroupRWTH Aachen University Aachen Germany

ISBN: (纸本)9781457705380

In this paper, we propose a new method for computing and applying language model look-ahead in a dynamic network decoder, exploiting the sparseness of backing-off n-gram language models. Only partial (sparse) look-ahead tables are computed, with a size that depends on the number of words that have an n-gram score in the language model for a specific context, rather than a constant, vocabulary dependent size. Since high order backing-off language models are inherently sparse, this mechanism reduces the runtime- and memory effort of computing the look-ahead tables by magnitudes. A modified decoding algorithm is required to apply these sparse LM look-ahead tables efficiently. We show that sparse LM look-ahead is much more efficient than the classical method, and that full n-gram look-ahead becomes favorable over lower order look-ahead even when many distinct LM contexts appear during decoding.

关键词： speech recognition decoding search language model look-ahead modelling languages Tables Language decoding indium new methods dynamic network WWOX gene decoding algorithm

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One Realization of the Generalized (L, G)-Codes

One Realization of the Generalized (L, G)-Codes

引用

Wave Electronics and its Application in Information and Telecommunication Systems (WECONF)

作者： I. K. Noskov S. V. Bezzateev ITMO University Saint-Petersburg Russia Saint-Petersburg State University of Aerospace Instrumentation Saint-Petersburg Russia

In this work we consider one possible approach of realization of the generalized (L, G)-codes with a separable polynomial G(x) and rational functions with a denominator degree greater than 1 as the locators set L.

ISBN: (数字)9781728149448

ISBN: (纸本)9781728149455

关键词： error-correcting codes Goppa codes Generalized (L G)-codes decoding algorithm irreducible polynomials Goppa codes Error correction codes decoding algorithm Irreducible polynomial Locators rational functions

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New rank codes with efficient decoding

New rank codes with efficient decoding

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International Conference on Engineering and Telecommunication

作者： E. M. Gabidulin Dept. of Radio Engineering and Control System Moscow Institute of Physics and Technology (State University)

ISBN: (纸本)9781538645482

Linear maximum rank distance (MRD) codes in vector representation for all parameters are known for many years [3], [4]. There exist fast decoding algorithms to correct rank errors and rank erasures for these codes [3], [5], [6], [7]. Recently, Sheekey [8] and other researches [9], [10], [11], [12] proposed new families of the vector MRD codes. No decoding algorithms were still described. In this paper, generator and parity-check matrices are constructed for a few new codes. Our contribution is a new construction of the vector MRD codes based on modification of codes from [3]. Efficient decoding algorithms are described.

关键词： Finite field New MRD codes Syndrome decoding algorithm

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Implementation of Turbo Code Based on CCSDS

Implementation of Turbo Code Based on CCSDS

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2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Zekun Yang Dongli Jin Beijing Institute of Tracking and Telecommunications Technology

The paper explores the background and development of Turbo code, and analyzes the basic principle of coding and decoding in Turbo code. Based on CCSDS standard, the implementation and simulation of Tu

ISBN: (纸本)9781467389808

关键词： Turbo encoding Turbo decoding CCSDS consultative committee for space data systems turbo codes decoding decoding algorithm

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Error-correcting Codes on a Bethe-like Lattice 00

Error-correcting Codes on a Bethe-like Lattice

引用

Annual Conference on Neural Information Processing Systems

作者： Yoshiyuki Kabashima David Saad Renato Vicente Research Group Aston University Birmingham B4 7ET United Kingdom

ISBN: (纸本)0262122413

We analyze Gallager codes by employing a simple mean-field approximation that distorts the model geometry and preserves important interactions between sites. The method naturally recovers the probability propagation decoding algorithm as an extremization of a proper free-energy. We find a thermodynamic phase transition that coincides with information theoretical upper-bounds and explain the practical code performance in terms of the free-energy landscape.

关键词： crystal lattices Phase transtormations Codes decoding algorithm

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