检索结果-内蒙古大学图书馆

Corrections to “adaptive Modulation and coding for Underwater Acoustic OFDM” [L. Wan, H. Zhou, X. Xu, Y. Huang, S. Zhou, Z. Shi, and J.-H. Cui, IEEE J. Ocean. Eng., vol. 40, no. 2, pp. 327–336, Apr. 2015. DOI: 10.1109/JOE.2014.2323365]

引用

IEEE Journal of Oceanic Engineering 2015年第3期40卷 753-753页

作者： Lei Wan Hao Zhou Xiaoka Xu Yi Huang Shengli Zhou Zhijie Shi Jun-Hong Cui Department of Electrical and Computer Engineering University of Connecticut Storrs CT USA Department of Computer Science and Engineering University of Connecticut Storrs CT USA

Presents corrections to acknowledgements from the paper, “adaptive Modulation and coding for Underwater Acoustic OFDM” [L. Wan, et al, IEEE J. Ocean. Eng., vol. 40, no. 2, pp. 327–336, Apr. 2015).

关键词： Channel estimation Underwater communication Underwater acoustics OFDM adaptive coding Signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

adaptive Transmission for Network-Coded All-to-All Broadcast in Multi-Hop Ad Hoc Wireless Networks

引用

IEEE COMMUNICATIONS LETTERS 2019年第12期23卷 2412-2416页

作者： Borkotoky, Siddhartha S. Pursley, Michael B. Clemson Univ Clemson SC 29634 USA Lakeside Labs GmbH A-9020 Klagenfurt Austria

We describe and evaluate a new suite of protocols for the delivery of information from each node to every other node in a multi-hop ad hoc wireless network. The protocol suite is integrated with random linear network coding to mitigate the effects of packet losses due to noise and time-varying fading on the radio links. The suite includes a practical three-mode protocol for packet-by-packet selection of the channel code and modulation based on control information from statistics derived by the nodes themselves. Our performance metric is energy efficiency, and our emphasis is on robust performance in practical networks for which optimization is not feasible.

关键词： Protocols Indexes Modulation Fading channels Radio links Ad hoc networks Receivers Packet radio adaptive modulation adaptive coding networks

来源：评论

学校读者我要写书评

暂无评论

An adaptive Ordered Shifted-Pruning List Decoder for Polar Codes

引用

IEEE ACCESS 2020年 8卷 225181-225190页

作者： Lv, Yansong Yin, Hang Wang, Yuhuan Commun Univ China State Key Lab Media Convergence & Commun Beijing 100024 Peoples R China

The polar code has been selected as a channel coding solution for the control channel of 5th generation wireless systems (5G). Compared with the conventional cyclic-redundancy-check-aided successive cancellation list (CA-SCL) decoder for polar codes, the improved CA-SCL decoders not only can reduce the computational complexity but also keep similar block error rate (BLER). To further reduce the computational complexity and improve the BLER performance of the CA-SCL decoder, we propose an adaptive ordered shifted-pruning list (ADOSPL) decoder. The proposed method employs the ordered critical set (OCS) to improve the BLER performance and uses adaptive search width to reduce the computational complexity. Simulation results reveal that the ADOSPL decoder can significantly reduce 94.75% computational complexity compared with the CA-SCL decoder and improve the BLER performance gain up to 0.25dB for a polar code (512, 272) when the search width is 32. Moreover, lower computational complexity brings lower energy consumption and lower decoding delay in actual communication systems.

关键词： Decoding Polar codes Computational complexity Simulation Signal to noise ratio Channel coding 5G mobile communication Channel coding polar code list decoder adaptive coding ordered shifted pruning

来源：评论

学校读者我要写书评

暂无评论

Central thalamic inactivation impairs the expression of action- and outcome-related responses of medial prefrontal cortex neurons in the rat

引用

EUROPEAN JOURNAL OF NEUROSCIENCE 2019年第1期50卷 1779-1798页

作者： Francoeur, Miranda J. Wormwood, Benjamin A. Gibson, Brett M. Mair, Robert G. Univ New Hampshire Dept Psychol Durham NH 03824 USA

The mediodorsal (MD) and adjacent intralaminar (IL) and midline nuclei provide the main thalamic input to the medial prefrontal cortex (mPFC) and are critical for associative learning and decision-making. MD neurons exhibit activity related to actions and outcomes that mirror responses of mPFC neurons in rats during dynamic delayed non-match to position (dDNMTP), a variation of DNMTP where start location is varied randomly within an open octagonal arena to avoid confounding behavioral events with spatial location. To test whether the thalamus affects the expression of these responses in mPFC, we inhibited the central thalamus unilaterally by microinjecting muscimol at doses and sites found to affect decision-making when applied bilaterally. Unilateral inactivation reduced normalized task-related responses in the ipsilateral mPFC without disrupting behavior needed to characterize event-related neuronal activity. Our results extend earlier findings that focused on delay-related activity by showing that central thalamic inactivation interferes with responses related to actions and outcomes that occur outside the period of memory delay. These findings are consistent with the broad effects of central thalamic lesions on behavioral measures of reinforcement-guided responding. Most (7/8) of the prefrontal response types affected by thalamic inactivation have also been observed in MD during dDNMTP. These results support the hypothesis that MD and IL act as transthalamic gates: monitoring prefrontal activity through corticothalamic inputs;integrating this information with signals from motivational and sensorimotor systems that converge in thalamus;and acting through thalamocortical projections to enhance expression of neuronal responses in the PFC that support adaptive goal-directed behavior.

关键词： adaptive coding intralaminar nuclei mediodorsal nucleus prefrontal cortex rat thalamocortical networks

来源：评论

学校读者我要写书评

暂无评论

Intraparietal sulcus maintains working memory representations of somatosensory categories in an adaptive, context-dependent manner

引用

NEUROIMAGE 2020年 221卷 117146-117146页

作者： Velenosi, Lisa Alexandria Wu, Yuan-Hao Schmidt, Timo Torsten Blankenburg, Felix Free Univ Berlin Neurocomputat & Neuroimaging Unit Habelschwerdter Allee 45 D-14195 Berlin Germany Humboldt Univ Berlin Sch Mind & Brain Luisenstr 56 D-10117 Berlin Germany NYU NYU Grossman Sch Med 550 First Ave New York NY 10016 USA

Working memory (WM) representations are generally known to be influenced by task demands, but it is not clear whether this extends to the somatosensory domain. One way to investigate the influence of task demands is with categorization paradigms, wherein either a single stimulus or an associated category is maintained in WM. In the somatosensory modality, category representations have been identified in the premotor cortex (PMC) and the intraparietal sulcus (IPS). In this study we used multivariate-pattern-analysis with human fMRI data to investigate whether the WM representations in the PMC, IPS or other regions are influenced by changing task demands. We ensured the task-dependent, categorical WM information was decorrelated from stimulus features by (1) teaching participants arbitrary, non-rule based stimulus groupings and (2) contrasting identical pairs of stimuli across experimental conditions, where either a single stimulus or the associated group was maintained in WM. Importantly, we also decoupled the decision and motor output from the WM representations. With these experimental manipulations, we were able to pinpoint stimulus-specific WM information to the left frontal and parietal cortices and context-dependent, group-specific WM information to the left IPS. By showing that grouped stimuli are represented more similarly in the Group condition than in the Stimulus condition, free from stimulus and motor output confounds, we provide novel evidence for the adaptive nature of somatosensory WM representations in the IPS with changing task-demands.

关键词： Working memory Somatosensory adaptive coding Categorization Multivariate fMRI

来源：评论

学校读者我要写书评

暂无评论

Capacity of Two-Way Channels With Symmetry Properties

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 2019年第10期65卷 6290-6313页

作者： Weng, Jian-Jia Song, Lin Alajaji, Fady Linder, Tamas Queens Univ Dept Math & Stat Kingston ON K7L 3N6 Canada Contextere Ltd Ottawa ON K1Y 2C5 Canada

In this paper, we make use of channel symmetry properties to determine the capacity region of three types of two-way networks: 1) two-user memoryless two-way channels (TWCs);2) two-user TWCs with memory;and 3) threeuser multiaccess/degraded broadcast (MA/DB) TWCs. For each network, symmetry conditions under which a Shannon-type random coding inner bound (under independent non-adaptive inputs) is tight are given. For two-user memoryless TWCs, prior results are substantially generalized by viewing a TWC as two interacting state-dependent one-way channels. The capacity of symmetric TWCs with memory, whose outputs are functions of the inputs and independent stationary and ergodic noise processes, is also obtained. Moreover, various channel symmetry properties under which the Shannon-type inner bound is tight are identified for three-user MA/DB TWCs. The results not only enlarge the class of symmetric TWCs whose capacity region can be exactly determined but also imply that interactive adaptive coding, not improving capacity, is unnecessary for such channels.

关键词： Network information theory two-way channels capacity region inner and outer bounds channel symmetry multiple access and broadcast channels channels with memory adaptive coding

来源：评论

学校读者我要写书评

暂无评论

Novel Design for Short Analog Fountain Codes

引用

IEEE COMMUNICATIONS LETTERS 2019年第8期23卷 1306-1309页

作者： Abbas, Rana Shirvanimoghaddam, Mahyar Huang, Tao Li, Yonghui Vucetic, Branka Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia James Cook Univ Coll Sci & Engn Cairns Qld 4878 Australia

adaptive coding and modulation in current cellular networks relies on a channel quality indicator fed back from the receiver to the transmitter. The process of acquiring channel state information at the transmitter (CSIT) is estimated to take 5-8 ms. For short-packet transmissions in machine-type communications (MTC), the data transmission of small payloads is estimated to take a fraction of a millisecond, i.e., a fraction of the end to end latency. This is especially problematic for ultra-reliable low-latency communications (URLLC) that require an end-to-end latency of 1 ms only. To this end, self-adaptive coding and modulation, aka rateless coding, is much needed to cater for these stringent requirements. In this letter, a new design is proposed for the recently proposed class of rateless codes, dubbed analog fountain codes (AFC), tailored for short-packet transmissions. The numerical results show no error floors down to block error rates of 10(-7), thus meeting the ultra-high reliability requirement of URLLC.

关键词： adaptive coding channel coding modulation coding encoding iterative decoding

来源：评论

学校读者我要写书评

暂无评论

Sparse optimization of non separable vector lifting scheme for stereo image coding

引用

JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2018年 57卷 283-293页

作者： Bezzine, I Kaaniche, M. Boudjit, S. Beghdadi, A. Univ Paris 13 Sorbonne Paris Cite Inst Galilee L2TI 99 Ave Jean Baptiste Clement F-93430 Villetaneuse France

One of the potential 3D imaging techniques relies on the use of stereoscopic systems. The great interest in these systems has resulted in huge amount of data which needs to be compressed for storage and transmission purposes. In this context, vector lifting scheme has been found to be an efficient approach for stereo image coding. For instance, the coding performance depends on the design of the involved lifting operators referred to as prediction and update filters. For this reason, while a non separable vector lifting structure is retained, we investigate different techniques for optimizing sparse criteria to design the filters used with both views. More precisely, an independent full optimization algorithm as well as a joint algorithm will be developed and studied. Simulations performed on different stereo images demonstrate the effectiveness of the proposed sparse optimization algorithms in terms of quality of reconstruction and bitrate saving. (C) 2018 Elsevier Inc. All rights reserved.

关键词： Stereo images adaptive coding Vector lifting scheme Non separable transform Optimization

来源：评论

学校读者我要写书评

暂无评论

On-board processing adaptive coding and modulation for regenerative satellite systems

On-board processing adaptive coding and modulation for regen...

引用

National Doctoral Academic Forum on Information and Communications Technology 2013

作者： Yongbin Wang Hong Ji Yi Li Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781632660268

For the widely coverage of satellite beam, the dominated weather-caused attenuation on Ka-band causes the asymmetric fading of satellite uplink and downlink. The widely recognized adaptive coding and modulation (ACM), a significant fading mitigation technique in satellite communication systems, mainly focuses on improving the downlink spectrum efficiency. However, the uplink spectrum efficiency is always impaired when downlink channel condition is poor. In this paper, we propose a novel ACM scheme for geostationary (GEO) regenerative satellite systems, on which the on-board processing is based. To be more practical, two transfer modes: Transparent-transfer and Regenerative-transfer are designed. Nevertheless, regenerative transfer mode would result in data overflow on the satellite in the case of the selected uplink modulation and coding order is higher than the downlink. In this paper, a dynamic bandwidth allocation scheme is also designed to avoid that. At last, simulation results highlight the spectral efficiency improvement of the proposed on-board processing ACM scheme over the existing ACM scheme.

关键词： ACM DVB-S2/DVBRCS2 GEO regenerative satellite asymmetric channel fading on-board processing adaptive coding Satellite systems spectral efficiency Downlink Regenerative satellite uplink Satellite communication systems transfer mode satellites

来源：评论

学校读者我要写书评

暂无评论

A Note on adaptive coding Scheme for Improvement of Reference Tracking in Wireless Feedback Control Systems

A Note on Adaptive Coding Scheme for Improvement of Referenc...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Shingo HATTORI Kentaro KOBAYASHI Hiraku OKADA Masaaki KATAYAMA Graduate School of Engineering Nagoya University EcoTopia Science Institute Nagoya University

ISBN: (纸本)9781479902255

In wireless feedback control systems, it is important how to reduce packet losses. If channel coding is used, packet losses may decrease. But its redundancy decreases the packet transmission rate under the same bit rate, so that disturbances in the controlled plant may deteriorate the quality of the control system. To improve the quality of the control system, the channel coding should be used adaptively based on packet losses and disturbances. In this paper, we propose an adaptive coding scheme based on the quality of the communication layer and the control (application) layer. In this scheme, the channel coding is used adaptively based on a predicted state of the controlled plant under a packet loss rate. We show that the proposed adaptive coding improves the control quality compared with that of the fixed rate coding.

关键词： adaptive coding Wireless control State prediction Feedback control adaptive coding wireless remote control Packet loss Channel coding feedback control Feedback control systems Quality Control control systems Bit rate Plant control

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：