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Cognitive Homeostatic Agents 21

Cognitive Homeostatic Agents

引用

International Conference on Autonomous Agents and Multiagent Systems

作者： Amol Kelkar ***

ISBN: (纸本)9781713832621

Human brain has been used as an inspiration for building autonomous agents, but it is not obvious what level of computational description of the brain one should use. This has led to overly opinionated symbolic approaches and overly unstructured connectionist approaches. We propose that using homeostasis as the computational description provides a good compromise. Similar to how physiological homeostasis is the regulation of certain homeostatic variables, cognition can be interpreted as the regulation of certain 'cognitive homeostatic variables'. We present an outline of a Cognitive Homeostatic Agent, built as a hierarchy of physiological and cognitive homeostatic subsystems and describe structures and processes to guide future exploration. We expect this to be a fruitful line of investigation towards building sophisticated artificial agents that can act flexibly in complex environments, and produce behaviors indicating planning, thinking and feelings.

关键词： Artificial agent Homeostasis Cognitive homeostasis Hierarchical reinforcement learning Predictive coding Free energy principle Cognitive homeostatic agent Robotic control Lifelong learning Online learning Emotions Rewards Predictive processing Hippocampus Engrams Homeostasis Robot control prediction coding lifelong learning e-learning Emotions Reward Hippocampus

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Coordinated Tomlinson-Harashima precoding design algorithms for overloaded multi-user MIMO systems

Coordinated Tomlinson-Harashima precoding design algorithms ...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Keke Zu Bin Song Martin Haardt Rodrigo C. de Lamare Communications Research Laboratory Ilmenau University of Technology Ilmenau Germany Ericsson Research Sweden Dept. of Electronics/CETUC University of York/PUC-Rio Rio de Janeiro Brazil

ISBN: (纸本)9781479958641

Tomlinson-Harashima precoding (THP) is a nonlinear processing technique employed at the transmit side to implement the concept of dirty paper coding (DPC). The application of THP is restricted by the dimensionality constraint that the number of transmit antennas has to be greater or equal to the total number of receive antennas. In this paper, we propose an iterative coordinate THP algorithm for overloaded scenarios in which the total number of receive antennas is larger than the number of transmit antennas. The proposed algorithm is implemented on two types of THP structures, the decentralized THP (dTHP) with diagonal weighted filters at the receivers of the users, and the centralized THP (cTHP) with diagonal weighted filter at the transmitter. Simulation results show that a significantly better bit error rate (BER) and sum-rate performances can be achieved by the proposed iterative coordinate THP algorithm as compared to previously reported techniques.

关键词： Tomlinson-Harashima precoding (THP) Dimensionality constraint Overloaded systems Coordinated beamforming algorithm pirarubicin transmitting antennas ANTENNA prediction coding Bit error rate Receiving antennas multiple input multiple output systems Receivers

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Joint Transceiver Design for MIMO Relay Systems Employing SC-FDE

Joint Transceiver Design for MIMO Relay Systems Employing SC...

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IEEE Global Communications Conference

作者： Peiran Wu Robert Schober Vijay Bhargava Department of Electrical and Computer Engineering The University of British Columbia

ISBN: (纸本)9781467309202

In this paper, we propose a joint transceiver design for multiple-input multiple-output (MIMO) relay systems employing single-carrier frequency-domain equalization (SC-FDE). We first derive the optimal minimum mean-squared error (MMSE) frequency-domain linear equalization filter at the destination and the associated stream-wise MSEs at the output of the equalizer. Subsequently, we optimize the source and relay precoding matrices for various optimality criteria by minimizing a general function of the MSEs subject to separate source and relay power constraints. The structures of the optimal source and relay precoding matrices are obtained in closed form and the remaining power allocation problems are solved using an alternating optimization algorithm. Simulation results show that the proposed SC-FDE designs out-perform orthogonal frequency-division multiplexing based MIMO relay systems in terms of both uncoded and coded bit error rate.

关键词： Relay systems multiple input multiple output systems Transceivers Mean square error relay Bit error rate closed forms prediction coding destination

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A Transform-and-Forward Scheme for Relay Networks

A Transform-and-Forward Scheme for Relay Networks

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IEEE Global Communications Conference

作者： Mohammud Z. Bocus Gillian Huang Justin P. Coon Toshiba Research Europe Limited Telecommunications Research Laboratory

ISBN: (纸本)9781479913510

We present a new means of implementing distributed space-time block codes (STBC) for wireless amplify-and-forward (AF) relay networks. In the proposed method, each source antenna transmits one column of an STBC matrix derived from a generalized complex orthogonal design (GCOD). Such designs were originally intended for single hop environments. At each relay antenna, a precoding matrix and a fixed gain amplification factor are applied before the resulting signal is forwarded to the next set of nodes. The precoding operation at the relays rearranges the elements of the received vector in such a way that the equivalent STBC code observed at the destination is quasi-orthogonal. The characteristics and one structure for the precoding matrices are proposed. Initially, a dual hop system is considered for convenience. We then demonstrate how the scheme can be readily extended to multihop networks. We refer to this type of relay system as the transform-and-forward scheme. Simulation results demonstrate the performance of the technique over an existing approach.

关键词： STBC GCOD precoding matrices space time block coding Relay networks relay prediction coding Scheme Relay systems

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Decentralizing Multi-cell Maximum Weighted Sum Rate Precoding via Large System Analysis

Decentralizing Multi-cell Maximum Weighted Sum Rate Precodin...

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European Signal Processing Conference

作者： Wassim Tabikh Yi Yuan-Wu Dirk Slock Orange Labs Issy-les-moulineaux France Orange Labs EURECOM

ISBN: (纸本)9781509018918

We propose a decentralized algorithm for weighted sum rate (WSR) maximization via large system analysis. The rate maximization problem is done via weighted sum mean-squared error (WSMSE) minimization. Decentralized processing relies on the exchange via a backhaul link of a low amount of information. The inter-cell interference terms couple the maximization problems at the different base stations (BS)s. Large system approximations are used to replace the inter-cell interference terms and to decouple the problems. We demonstrate that the approximates depend only on the slow fading terms or second order statistics of the channels. Then, each BS computes the transmit precoders to serve its own user equipments (UE)s locally. No feedback channels from the UEs to the serving BSs will be required.

关键词： Interference Optimization System analysis and design Array signal processing Europe Precoding System analyses prediction coding array signal processing weight sums Intelligent systems analysis and design System design interference inter-cell interference

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Robust Precoder Design for Two-Hop Relay Networks over Double Correlated Rician Channels

Robust Precoder Design for Two-Hop Relay Networks over Doubl...

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IEEE Vehicular Technology Conference

作者： Zhen Luo Shu Hung Leung Xiang Bin Yu Department of Electronic Engineering and State Key Laboratory of Millimeter Waves City University of Hong Kong Hong Kong

ISBN: (纸本)9781467361866

In this paper, a statistically robust precoder design is presented for space-time coded multiple-input, multiple-output (MIMO) relay networks over double correlated Rician channels. We assume both the source and destination terminals are equipped with multiple-antenna, while a single antenna is used in distributed non-regenerative relay nodes for reducing feedback overhead and processing burden on relays. The precoding matrix at the source terminal and amplifying parameters of relay nodes are optimized to maximize the total signal-to-noise ratio (SNR) at the destination assuming only statistical channel state information (CSI) available at the transmission sides. The optimization problem can be efficiently solved by an iterative method, resulting in a single-beam mode source precoder and diagonal precoding matrix for relay nodes. Numerical results demonstrate that the proposed scheme outperforms the equal power allocation scheme and existing method with single antenna nodes.

关键词： MIMO SNR CSI signal to noise ratios multiple input multiple output systems Relay networks Supernova remnants Rician channels Trunk Node relay destination Ganglia iterative methods prediction coding

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Performance of Precoding-aided Multi-user Downlink Communication Enduring Nakagami-m Fading

Performance of Precoding-aided Multi-user Downlink Communica...

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International Conference on Wireless Communications, Signal Processing and Networking

作者： Aadithya Venkatanarayanan Ashwin Vijayavel Prabagarane Nagaradjane Department of Electronics and Communication Engineering SSN college of engineering Kalavakkam-603 110 India

ISBN: (纸本)9781467393393

In this paper, we present the multi-user performance of a precoding aided downlink (DL) communication when the channels connecting the base station (BS) and the mobile stations (MSs) experience Nakagami-m fading. The precoding approaches employed in our work are based on minimum variance distortionless response (MVDR) and minimum power distortionless response (MPDR). In a multi-user DL communication, multi-user interference (MUI) will be the major channel impairment. The precoding techniques employed in our work is capable of fully removing the DL-MUI, thereby, resulting in zeroforcing (ZF) and minimum-mean-square-error (MMSE) solutions. Further, the considered precoding approaches result in achieving the same error performance as that of the classical ZF and MMSE precoding techniques.

关键词： Fading channels TV Fading channels Television prediction coding error performance Downlink distortionless fading color zero frequency Communication Research

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Joint Use of H-inf Criterion in Channel Estimation and Precoding to Mitigate Pilot Contamination in Massive MIMO Systems

Joint Use of H-inf Criterion in Channel Estimation and Preco...

引用

IEEE Global Communications Conference

作者： Peng Xu Dongming Wang Jinkuan Wang School of Computer and Communication Engineering Northeastern University at Qinhuangdao National Mobile Communications Research Laboratory Southeast University School of Information Science and Engineering Northeastern University

ISBN: (纸本)9781479959532

In this paper, a channel estimation (CE) and precoding scheme by using H-infinity (H-inf) criterion for mitigation of pilot contamination (PC) in Massive multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is reconsidered. Firstly, different thresholds in H-inf CE and precoding are considered. Secondly, asymptotic analysis of the large system is applied to simplify the H-inf precoding, which shows that the complexity of an order of magnitude is reduced. Thirdly, approximate downlink achievable data rates per user are presented for different CE and precoding schemes, such as H-inf and minimum mean square error (MMSE) CE, MMSE, zero-forcing (ZF) and H-inf precoding. The analytic work shows that the proposed scheme can provide dual mitigation to the PC. That is, the H-inf CE mitigates the PC by adjusting its thresholds, and the H-inf precoding is utilized to suppress the PC by considering inter-cell interference. The numerical results show that the joint use of H-inf CE and H-inf precoding outperforms existing several schemes in terms of mitigation to the PC.

关键词： Massive MIMO Pilot contamination Channel estimation Precoding H-inf prediction coding channel estimation multiple input multiple output systems Personal computers cerium

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A Tomlinson-Harashima precoding method to improve channel performance

A Tomlinson-Harashima precoding method to improve channel pe...

引用

10th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2014)

作者： Guannan Li Jie Cao Jinghe Huo Academy of Armored Forces Engineering Beijing China

ISBN: (纸本)9781510804166

In this paper, we propose a new improved TH precoding algorithm, which intends to solve the problem of high bit error rate (BER) from traditional THP algorithm when the channel is in bad condition, and compare the performance with different classic ZF-THP and MMSE-THP. Also the conclusion is verified by emulation. Based on the Precoding module algebra, we proposed the Reduce Grid Algorithm which has high efficiency, and pre-coding scheme based on the Reduce grid algorithm, which can be used in non-ideal MIMO model.

关键词： MMSE-THP Non Liner Precoding Tomlinson-Harashima Precoding ZF-THP channel performance prediction coding simulating algorithms modular algebra grids Grid

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Joint Precoding and RRH selection for Green MIMO C-RAN

Joint Precoding and RRH selection for Green MIMO C-RAN

引用

IEEE Global Communications Conference

作者： Cunhua Pan Huiling Zhu Nathan J. Gomes Jiangzhou Wang School of Engineering and Digital Arts University of Kent

ISBN: (纸本)9781509013296

This paper jointly optimizes the precoding matrices and the set of active remote radio heads (RRHs) to minimize the network power consumption for a cloud radio access network (C-RAN) where both the RRHs and users all have multiple antennas. Both users' rate requirements and per-RRH power constraints are considered. Due to these conflicting constraints, this optimization problem may be infeasible. We propose to solve this problem with two phases. In Phase I, a new approach is proposed to check the feasibility of the original problem. If the feasibility is guaranteed, in Phase II, a low-complexity algorithm is proposed to solve the original optimization problem. Simulation results demonstrate the rapid convergence of the proposed algorithms and the benefits of equipping multiple antennas at the user side.

关键词： Power consumption multiple antenna RRH gene prediction coding original problem Consumers TWO-PHASE multiple input multiple output systems Wireless networks

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