检索结果-内蒙古大学图书馆

joint coding in parallel symmetric interference channels with deterministic model

EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2017年第1期2017卷 1-13页

作者： Xue, Yifan Tian, Yafei Yang, Chenyang Beihang Univ Sch Elect & Informat Engn 37 Xueyuan RdHaidian Dist Beijing 100191 Peoples R China

In parallel interference channels, the sum-rate achieved by joint coding among subchannels can exceed the sum of the achievable rate of each subchannel with individual coding. In this paper, a capacity-achieving joint coding scheme is proposed for parallel symmetric interference channel. First, we provide a motivating example, from which the insights into the joint coding scheme are obtained. Second, we introduce a transmission scheme in two-user parallel symmetric interference channels, where the subchannels can cooperate to cancel interference. Then, by taking advantage of signal level alignment of the interference from different users, we generalize the scheme to multi-user cases. Finally, we prove that our scheme can achieve the sum capacity and illustrate the generalized degrees of freedom gains over individual coding in various interference scenarios.

关键词： Deterministic model Generalized degrees of freedom Interference alignment joint coding Parallel interference channel

来源：评论

学校读者我要写书评

暂无评论

joint coding of Local and Global Deep Features in Videos for Visual Search

引用

IEEE TRANSACTIONS ON IMAGE PROCESSING 2020年 29卷 3734-3749页

作者： Ding, Lin Tian, Yonghong Fan, Hongfei Chen, Changhuai Huang, Tiejun Peking Univ Sch Elect Engn & Comp Sci Natl Engn Lab Video Technol Beijing 100871 Peoples R China Peng Cheng Lab Shenzhen 518066 Peoples R China Kingsoft Cloud Co Beijing 100085 Peoples R China Hikvision Co Hangzhou 310012 Peoples R China

Practically, it is more feasible to collect compact visual features rather than the video streams from hundreds of thousands of cameras into the cloud for big data analysis and retrieval. Then the problem becomes which kinds of features should be extracted, compressed and transmitted so as to meet the requirements of various visual tasks. Recently, many studies have indicated that the activations from the convolutional layers in convolutional neural networks (CNNs) can be treated as local deep features describing particular details inside an image region, which are then aggregated (e.g., using Fisher Vectors) as a powerful global descriptor. Combination of local and global features can satisfy those various needs effectively. It has also been validated that, if only local deep features are coded and transmitted to the cloud while the global features are recovered using the decoded local features, the aggregated global features should be lossy and consequently would degrade the overall performance. Therefore, this paper proposes a joint coding framework for local and global deep features (DFJC) extracted from videos. In this framework, we introduce a coding scheme for real-valued local and global deep features with intra-frame lossy coding and inter-frame reference coding. The theoretical analysis is performed to understand how the number of inliers varies with the number of local features. Moreover, the inter-feature correlations are exploited in our framework. That is, local feature coding can be accelerated by making use of the frame types determined with global features, while the lossy global features aggregated with the decoded local features can be used as a reference for global feature coding. Extensive experimental results under three metrics show that our DFJC framework can significantly reduce the bitrate of local and global deep features from videos while maintaining the retrieval performance.

关键词： Local deep feature joint coding visual search inter-feature correlation

来源：评论

学校读者我要写书评

暂无评论

Bit allocation and constraints for joint coding of multiple video programs

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 1999年第6期9卷 949-959页

作者： Wang, LM Vincent, A Gen Instrument Corp San Diego CA 92121 USA Commun Res Ctr Ottawa ON K2H 8S2 Canada

Recent studies have shown that joint coding is more efficient and effective than independent coding for compression of multiple video programs [3]-[7]. Unlike independent coding, joint coding is able to dynamically distribute the channel capacity among video programs according to their respective complexities and hence achieve a more uniform picture quality, This paper examines the bit-allocation issues for joint coding of multiple video programs and provides a bit-allocation strategy that results in a uniform picture quality among programs as well as within a program. To prevent,the encoder/decoder buffers from overflowing and underflowing, further constraints on bit allocation are also discussed.

关键词： constraints for buffer protection dynamic bit allocation joint coding multiprogram transmission rate control statistical multiplexing

来源：评论

学校读者我要写书评

暂无评论

joint coding of Multiple H.264 Video Programs

引用

13th Iberoamerican Congress on Progress in Pattern Recognition, Image Analysis and Applications

作者： Teixeira, Luis Corte-Real, Luis Univ Catolica Portuguesa R Diogo Botelho 1327 P-4169005 Porto Portugal INESC Porto P-4250 Porto Portugal

This paper presents a joint coding scheme for multiple H.264/AVC video programs. Channel bandwidth is divided among different programs according its complexity. Several complexity metrics are assessed. Initial results... 详细信息

ISBN: (纸本)9783540859192

关键词： joint coding video quality H.264

来源：评论

学校读者我要写书评

暂无评论

A Novel joint coding Scheme for Downlink Non-orthogonal Multiple Access (NOMA) 2

A Novel Joint Coding Scheme for Downlink Non-orthogonal Mult...

引用

2nd IEEE International Conference on Computer and Communications (ICCC)

作者： Hu, Xianan Ai, Bo Wang, Fanggang Ma, Guoyu Chen, Xia Miao, Deshan Zhao, Zhuyan Guan, Hao Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Beijing Peoples R China Nokia Bell Lab Beijing Peoples R China

ISBN: (纸本)9781467390262

Non-orthogonal multiple access (NOMA) is a promlsmg candidate for future 5G multiple access. Particularly NOMA uses power domain for multiple access and successive interference canceler (SIC) algorithm for multi-user detection (MUD). Different from the current downlink transmission scheme for NOMA, a novel joint coding scheme is proposed in this paper and corresponding improved SIC algorithms: zigzag SIC and iterative SIC are designed at the receiver side. Both zigzag SIC and iterative SIC algorithms are based on the novel offset frame structure. The goal is to take advantage of time domain diversity gain and certain long code gain of joint coding and advanced receiver to improve system performance without introduce additional degree of freedom. Practical considerations of NOMA, such as power allocation ratio, SIC, error propagation and channel fading are discussed. Simulation results show the proposed iterative SIC receiver and zigzag SIC receiver can both provide a better performance than conventional SIC receiver, so that the proposed joint coding scheme has obvious advantage over conventional NOMA.

关键词： 5G NOMA joint coding zigzag SIC iterative SIC

来源：评论

学校读者我要写书评

暂无评论

Bit allocation for joint coding of multiple video programs

Bit allocation for joint coding of multiple video programs

引用

1997 Conference on Visual Communications and Image Processing

作者： Wang, LM Vincent, A Communications Research Ctr. (Canada)

ISBN: (纸本)0819424358

By dynamically distributing the channel capacity among video programs according to their respective scene complexities, joint coding has been shown to be more efficient than independent coding for compression of multiple video programs [3]. This paper examines the bit allocation issue for joint coding of multiple video programs and provides a bit allocation strategy that results in uniform picture quality among programs as well as within a program.

关键词： joint coding multiple video programs bit allocation quantization MPEG

来源：评论

学校读者我要写书评

暂无评论

Modeling of the coding gain of joint coding for multi-program video transmission

Modeling of the coding gain of joint coding for multi-progra...

引用

1st IEEE International Conference on Multimedia and Expo (ICME2000)

作者： Vincent, A Corriveau, P Blanchfield, P Renaud, R Commun Res Ctr Ottawa ON K2H 8S2 Canada

In digital multi-program video transmission, several video programs are compressed (e.g., using MPEG-2), multiplexed, and transmitted over a constant bit rate (CBR) channel. joint coding, or statistical multiplexing, which is now widely used in digital television broadcasting, dynamically allocates the available channel capacity among programs according to picture content. This scheme is much more efficient than independent coding where each channel is allocated a fixed bit rate. In this paper, we present a model which can relate the decoded picture quality to bit rate, for both independent and joint coding. The model takes into account statistical variations of video program complexity, and incorporates experimental data drawn from formal subjective picture quality assessments. We use the model to calculate the coding gain of joint coding relative to independent coding, in terms of bandwidth savings.

关键词： joint coding statistical multiplexing picture quality model coding gain picture complexity

来源：评论

学校读者我要写书评

暂无评论

A Lossless Multichannel Bio-Signal Compression Based on Low-Complexity joint coding Scheme for Portable Medical Devices

引用

SENSORS 2014年第9期14卷 17516-17529页

作者： Kim, Dong-Sun Kwon, Jin-San Korea Elect Technol Inst Embedded Software Convergence Ctr Songnam 463816 Gyeonggi Do South Korea

Research on real-time health systems have received great attention during recent years and the needs of high-quality personal multichannel medical signal compression for personal medical product applications are increasing. The international MPEG-4 audio lossless coding (ALS) standard supports a joint channel-coding scheme for improving compression performance of multichannel signals and it is very efficient compression method for multi-channel biosignals. However, the computational complexity of such a multichannel coding scheme is significantly greater than that of other lossless audio encoders. In this paper, we present a multichannel hardware encoder based on a low-complexity joint-coding technique and shared multiplier scheme for portable devices. A joint-coding decision method and a reference channel selection scheme are modified for a low-complexity joint coder. The proposed joint coding decision method determines the optimized joint-coding operation based on the relationship between the cross correlation of residual signals and the compression ratio. The reference channel selection is designed to select a channel for the entropy coding of the joint coding. The hardware encoder operates at a 40 MHz clock frequency and supports two-channel parallel encoding for the multichannel monitoring system. Experimental results show that the compression ratio increases by 0.06%, whereas the computational complexity decreases by 20.72% compared to the MPEG-4 ALS reference software encoder. In addition, the compression ratio increases by about 11.92%, compared to the single channel based bio-signal lossless data compressor.

关键词： biosensor multichannel bio-signals joint coding medical device

来源：评论

学校读者我要写书评

暂无评论

Broadband and Programmable Amplitude-Phase-joint-coding Information Metasurface

引用

ACS APPLIED MATERIALS & INTERFACES 2022年第25期14卷 29431-29440页

作者： Wang, Hai Lin Zhang, Yan Kai Zhang, Tai Yi Ma, Hui Feng Cui, Tie Jun Southeast Univ Sch Informat Sci & Engn State Key Lab Millimeter Waves Nanjing 210096 Peoples R China Southeast Univ Inst Electromagnet Space Nanjing 210096 Peoples R China

Information metasurfaces have attracted much attention in recent years due to the capability to link the physical world and information science. However, most of the current information metasurfaces are either phase-only coding or amplitude-only coding, limiting their functions and applications. Here, a broadband and programmable amplitude-phase-jointcoding (APJC) information metasurface is proposed and experimentally demonstrated, from which the phase and amplitude of reflected electromagnetic waves can be independently controlled by adjusting the bias voltage of PIN diode integrated in the metaatom. In particular, the reflection amplitude can be continuously controlled from 0.1 to 0.9, and the reflection phase can be switched between two states with about 180 degrees phase difference. Thus, the proposed metasurface is capable of realizing independent 1-bit or multibit amplitude coding and 1-bit phase coding, and both of them can be reprogrammed in real time in broad band from 8 to 13 GHz. The abilities of the programmable APJC information metasurface in manipulating the electromagnetic waves are demonstrated by both numerical simulations and experiments, including to suppress the sidelobes of scattering beam, generate the diffractive waves with arbitrary magnitudes, and so on. These results show unique advantages of APJC information metasurface in real-time independent controls of energy allocation and wavefront tailoring of the electromagnetic waves in a wide frequency band.

关键词： information metasurface programmable amplitude phase joint coding

来源：评论

学校读者我要写书评

暂无评论

Age of Information With joint Packet coding in Industrial IoT

引用

IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第11期10卷 2499-2503页

作者： Chan, Tse-Tin Pan, Haoyuan Liang, Jiaxin Hang Seng Univ Hong Kong Dept Comp Hong Kong Peoples R China Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen 518060 Peoples R China Chinese Univ Hong Kong Dept Informat Engn Hong Kong Peoples R China

This letter studies the information freshness in an industrial Internet of Things (IIoT) network, measured by Age of Information (AoI). We consider a scenario where a sink node collects information update packets from different sensors and then uploads the collected packets to an edge server. This scenario has two main requirements: high information freshness (low AoI) and high reliability (low packet error rate, PER). Since update packets are usually short in practice, previous works usually packed and encoded multiple short packets from different sensors into a long packet to improve PER performances. However, while such a joint coding approach improves reliability, it generally leads to longer delay and hence possibly higher AoI. This letter investigates the AoI performance tradeoff by examining the number of packets to be jointly encoded. We consider two AoI metrics, average AoI and bounded AoI. In particular, bounded AoI is the threshold below which the instantaneous AoI falls for a given percentage of the time. Our theoretical analysis and numerical results show that there exist optimal numbers of jointly coded packets that minimize the average AoI and the bounded AoI. Specifically, a smaller number of packets is usually sufficient to achieve both high information freshness and high reliability.

关键词： Sensors Servers Encoding Industrial Internet of Things Reliability Delays Information age Age of information information freshness joint coding multiple access short packet

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：