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2010 5th International ICST Conference on Communications and Networking in China最新文献

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Signal shaping scheme based on the BWT for the transmission of non-binary sources with memory over the AWGN channel 基于小波变换的AWGN信道非二进制存储信号整形方案
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.114
P. Crespo, Xabier Insausti, J. Ser, Jesús Gutiérrez-Gutiérrez
This paper proposes a low-complexity signal shaping scheme for the transmission of non-binary symbols generated by sources with memory over the AWGN channel. It is based on using the Burrows-Wheeler Transform (BWT) [1] and standard two dimensional (QAM) constellations. The constellation points are driven based on the first order probabilities of the BWT output symbols so that shaping gain is maximized. The proposed system is an extension of the one introduced in [2] for binary sources. To evaluate its performance, the corresponding average energy per transmitted symbol is compared with that obtained when using an ideal source encoder followed by a standard uncoded QAM transmission scheme. In addition, it is shown that the power gain ratio between both systems can be assessed based on the Kullback-Leibler divergence between the first order probability distributions of the BWT output symbols and the Maxwell-Boltzmann probability distribution, obtained under the constraint of achieving an entropy equal to the entropy-rate of the original source.
提出了一种低复杂度的信号整形方案,用于在AWGN信道上传输由有记忆源产生的非二进制符号。它是基于使用Burrows-Wheeler变换(BWT)[1]和标准二维(QAM)星座。基于BWT输出符号的一阶概率驱动星座点,使整形增益最大化。所提出的系统是[2]中介绍的二进制源系统的扩展。为了评估其性能,将每个传输符号对应的平均能量与使用理想源编码器然后使用标准无编码QAM传输方案时获得的能量进行比较。此外,研究表明,在熵等于原始源熵率的约束下,基于BWT输出符号的一阶概率分布与麦克斯韦-玻尔兹曼概率分布之间的Kullback-Leibler散度,可以评估两个系统之间的功率增益比。
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引用次数: 2
Throughput maximization for opportunistic spectrum access via transmission probability scheduling scheme 基于传输概率调度的机会频谱接入吞吐量最大化
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.15
Yang Cao, Daiming Qu, Guohui Zhong, Tao Jiang
In this paper, we propose a novel transmission probability scheduling scheme for opportunistic spectrum access in cognitive radio networks. With the proposed scheme, the secondary user's throughput over a single channel is maximized while collision probability perceived by the primary user is constrained under a required threshold since the secondary user optimally schedules its transmission probabilities during the primary user's idle period. Moreover, we deeply study the maximum achievable throughput of the secondary user when the idle period of the primary user is different distribution to analyze the performance of the proposed transmission probability scheduling scheme. In a practical communication systems, where primary user's traffic pattern and parameters are unknown and the secondary user's spectrum sensing is imperfect, a novel predictor, which is based on hidden Markov model, is also proposed to predict the future channel states and to enable the transmission probability scheduling for the secondary user. Conducted simulations show that the proposed transmission probability scheduling scheme and predictor are effective and can offer good system performances.
针对认知无线网络中的机会频谱接入问题,提出了一种新的传输概率调度方案。该方案使备用用户在单信道上的吞吐量最大化,而备用用户在主用户空闲期间最优调度其传输概率,从而将主用户感知到的碰撞概率约束在所需的阈值下。此外,我们深入研究了在主用户空闲时段不同的情况下,备用用户可达到的最大吞吐量,以分析所提出的传输概率调度方案的性能。在实际通信系统中,针对主用户的业务模式和参数未知,辅助用户频谱感知不完善的情况,提出了一种基于隐马尔可夫模型的预测器,用于预测未来信道状态,实现对辅助用户的传输概率调度。仿真结果表明,所提出的传输概率调度方案和预测器是有效的,能够提供良好的系统性能。
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引用次数: 0
Analysis of improved performance for a satellite-to-ground coherent optical communication system with DQPSK modulation due to phase estimation 相位估计对DQPSK调制星地相干光通信系统性能的改善分析
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.94
Peng Liu, Juanjuan Yan, Zheng Zheng
The performance of a satellite-to-ground optical communication system with phase modulation is limited by phase fluctuations induced by atmospheric turbulence. To improve the system performance, one effective way is to use coherent detection. In this paper, a satellite-to-ground coherent optical communication system with differential quadrature phase-shift keying (DQPSK) modulation is studied, and a phase estimation algorithm based on M-th power scheme is used. The simulation results show that the phase noise induced by atmospheric turbulence can be suppressed greatly.
采用相位调制的星地光通信系统的性能受到大气湍流引起的相位波动的限制。为了提高系统的性能,采用相干检测是一种有效的方法。本文研究了一种差分正交相移键控(DQPSK)调制的星地相干光通信系统,采用了基于m功率方案的相位估计算法。仿真结果表明,该方法可以有效地抑制大气湍流引起的相位噪声。
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引用次数: 3
Information, communication and localization environment for travelers with sensory disabilities in public transports 公共交通中感官障碍旅客的信息、沟通与定位环境
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.116
G. Baudoin, O. Venard
Despite the progress of information, localization and communication technologies (ICT), traveler information is still very difficult to access for people with sensory disabilities (visual or auditory) during their journeys in urban public transports. Through the experience gained in the French research project INFOMOVILLE, this paper presents the main aspects that are to be considered for the wide deployment of transport information systems accessible to sensory impaired persons. It considers different points of view: technical questions (information, communication, localization, energy), ergonomics, economics, legal and normative context.
尽管信息、本地化和通信技术(ICT)取得了进步,但感官残疾人士(视觉或听觉)在乘坐城市公共交通工具时仍然很难获得旅行者信息。根据法国研究项目INFOMOVILLE所获得的经验,本文提出了在广泛部署感觉障碍者可使用的运输信息系统时应考虑的主要方面。它考虑了不同的观点:技术问题(信息、通信、本地化、能源)、人体工程学、经济学、法律和规范背景。
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引用次数: 6
Laplace prior based distributed compressive sensing 基于拉普拉斯先验的分布式压缩感知
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.82
Liang Tang, Zheng Zhou, Lei Shi, Haipeng Yao, J. Zhang, Y. Ye
Bayesian compressive sensing (BCS) utilizes the prior distribution of signal coefficients to reconstruct the original signal. The widely used prior is Laplace and Gaussian distributed. In this paper, we use the scene of L sets of signal sparse coefficients which are statistically related and take advantage of Laplace prior and statistically interrelationship among signals to propose the Laplace prior based distributed Bayesian compressive sensing. We provide the experiment result to demonstrating that the proposed method is an effective reconstruction algorithm and has a good performance.
贝叶斯压缩感知(BCS)利用信号系数的先验分布重构原始信号。广泛使用的先验是拉普拉斯分布和高斯分布。本文利用L组具有统计相关性的信号稀疏系数的场景,利用信号之间的拉普拉斯先验和统计相互关系,提出了基于拉普拉斯先验的分布式贝叶斯压缩感知。实验结果表明,该方法是一种有效的重构算法,具有良好的性能。
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引用次数: 3
Collision-free on-demand multiple access protocol for mobile ad hoc networks 面向移动自组网的无冲突按需多址协议
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.43
Chenyu Zhang, Kai Liu
In this paper, a collision-free on-demand multiple access (CF-ODMA) protocol for mobile ad hoc networks is proposed. In the CF-ODMA protocol, every node obtains collision-free polling service by channel reservation. In addition, a collision resolution algorithm is presented to guarantee that in the present of reservation collisions the access nodes can successfully access channel in sequence, and resolve packet collisions during the contention access period. Simulation results show that the proposed protocol can achieve better performances than the IEEE 802.11 distributed coordination function (DCF) and point coordination function (PCF) mechanisms in terms of throughput, average packet dropping rate and delay.
提出了一种面向移动自组网的无冲突按需多址(CF-ODMA)协议。在CF-ODMA协议中,每个节点通过信道预留获得无冲突轮询服务。此外,提出了一种冲突解决算法,以保证在存在保留冲突的情况下,访问节点能够按顺序成功访问信道,并在争用访问期间解决分组冲突。仿真结果表明,该协议在吞吐量、平均丢包率和时延方面均优于IEEE 802.11分布式协调函数(DCF)和点协调函数(PCF)机制。
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引用次数: 1
Towards efficient P2P-based VoD provisioning in future internet 面向未来互联网高效的p2p视频点播服务
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.56
M. Fouda, T. Taleb, M. Guizani, N. Kato
The current Internet framework is, no longer, able to support the heterogeneous networking technologies, mobile devices, increased number of users, and also the high user requirements for sophisticated services and applications. As a consequence, researchers envision the “future Internet” whereby all these issues may be effectively addressed. The future Internet architecture, amongst many components, is expected to comprise Peer-to-Peer (P2P) Video on Demand (VoD) streaming technologies. Since the conventional streaming techniques over P2P frameworks have a number of shortcomings, design issues pertaining to the P2P VoD schemes need to be seriously reconsidered. In this paper, we envision a scheme to effectively provide a VoD using P2P-based mesh overlay networks that may be part of the future Internet. Our scheme also comprises domain-based localization and congestion awareness strategies for the selection of the most appropriate peers. Empirical results have demonstrated the effectiveness of this scheme in terms of scalability and capability to reduce the startup latency and total link cost, and to also ensure a sustainable playback rate that is crucial for providing VoD services over the future Internet.
当前的Internet框架已经不能满足异构网络技术、移动设备、用户数量的增加以及用户对复杂服务和应用的高要求。因此,研究人员设想“未来的互联网”可以有效地解决所有这些问题。在众多组件中,未来的互联网架构预计将包括点对点(P2P)视频点播(VoD)流媒体技术。基于P2P框架的传统流媒体技术存在许多缺点,P2P视频点播方案的设计问题需要重新考虑。在本文中,我们设想了一种方案,使用基于p2p的网格覆盖网络有效地提供视频点播,这可能是未来互联网的一部分。我们的方案还包括基于域的定位和拥塞感知策略,用于选择最合适的对等体。实证结果表明,该方案在可扩展性和减少启动延迟和总链接成本的能力方面是有效的,并且还确保可持续的播放速率,这对于在未来的互联网上提供VoD服务至关重要。
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引用次数: 4
A new modeling method for vector processor pipeline using queueing network 一种基于排队网络的矢量处理器流水线建模新方法
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.125
Tie Qiu, Lei Wang, He Guo, Xiaoyan Liu, Lin Feng, Lei Shu
Embedded vector processor is a kind of high-performance parallel processor. Pipeline design is a key technology in embedded vector microprocessors. This paper proposes a new modeling method for vector processor pipeline using open queueing network by instruction set feature of vector processor. According to instruction set distribution of vector processor in the practical projects and owing in the pipeline modeling, the model of pipeline queueing network is analyzed. Total delay and mean delay are computed in every path. A better solution of pipeline is put forward as a result of delay data. Serving time of server nodes is averaged by partitioning for pipeline modeling and adding processing nodes in executing model. In conclusion, the delay data before and after improvement pipeline scheme are analyzed: the delay distributing of improvement scheme is almost equality and choke points with long delay and unequal are avoided.
嵌入式矢量处理器是一种高性能并行处理器。流水线设计是嵌入式矢量微处理器的一项关键技术。利用矢量处理器的指令集特性,提出了一种利用开放排队网络对矢量处理器流水线进行建模的新方法。根据实际工程中矢量处理器的指令集分布,结合流水线建模,分析了流水线排队网络的模型。计算每条路径上的总延迟和平均延迟。针对延迟数据,提出了一种较好的管道解决方案。通过划分管道建模和在执行模型中增加处理节点,平均服务器节点的服务时间。综上所述,分析了改进方案前后的延迟数据,改进方案的延迟分布基本相等,避免了长延迟和不等延迟的阻塞点。
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引用次数: 7
Novel bi-directional relaying schemes in a wireless multi-hop network 无线多跳网络中的新型双向中继方案
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.144
Shengyao Jin, Honglin Hu, Francois Gagnony, Olivier Mungery
The exchange of independent information between two nodes in a wireless network can be viewed as a two-way traffic flow. Such information exchange can be efficiently performed by exploiting relaying technique in a two-way channel. In this paper, we introduce two novel relaying techniques for Bidirectional Amplification of the Throughput (BAT) relaying in wireless multi-hop networks, termed as Equalized Detect-and-Forward (EDF) and Pre-equalized Amplify-and-Forward (PAF) BAT relaying schemes respectively. It is shown that the EDF BAT relaying scheme can decrease the complexity of the relay node by equalizing at the relay node, and the PAF BAT relaying scheme can reduce the signaling overhead by pre-equalizing at the transmitter. Furthermore, we analyze the achievable throughput of these relaying schemes, considering the impact of the location of the relay node.
无线网络中两个节点之间独立信息的交换可以看作是双向流量。利用双向信道中的中继技术可以有效地实现这种信息交换。本文介绍了无线多跳网络中用于双向吞吐量放大(BAT)中继的两种新型中继技术,分别称为均衡检测转发(EDF)和预均衡放大转发(PAF) BAT中继方案。结果表明,EDF BAT中继方案通过在中继节点进行均衡来降低中继节点的复杂度,PAF BAT中继方案通过在发送端进行预均衡来降低信令开销。此外,考虑中继节点位置的影响,我们分析了这些中继方案的可实现吞吐量。
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引用次数: 0
PeerIIR: Peer-to-Peer interactive internet radio system PeerIIR:点对点互动网络无线电系统
Pub Date : 2010-08-01 DOI: 10.4108/CHINACOM.2010.61
Tzu-Chieh Tsai, Tong-Yen Hsieh, Wen-Ching Lo
Peer-to-Peer (P2P) applications are popular recently and have become one of the hottest research topics. The participants can share their resources (such as processing power, disk storage, and network bandwidth) in the P2P architecture to collaborate file downloading and streaming services. In this paper, we design and implement an Interactive Internet Radio system using the P2P approach, called PeerIIR. When the host, co-hosts, and calliners are speaking at the same time, they will produce multiple streams which need to deliver to all the audience on the system. This will consume the network bandwidth inefficiently, or even exhaust the link capacity of the audience. Thus, how to process multiple streams produced at the same time and to deliver to all the audience efficiently is the key issue. When there is only one program host producing the audio stream, a distribution tree is built to distribute it. If there are co-hosts or calliners speaking, a distributed mixer negotiation algorithm is performed to build a voice mixing tree among PeerIIR servers. Therefore the audio streams are mixed distributedly and step by step along the mixing tree to save transmission bandwidth. The results from series of simulation show that the performance for response time and link/node stress is enhanced compared with some related works.
近年来,P2P (Peer-to-Peer, P2P)应用非常流行,已成为研究的热点之一。参与者可以在P2P架构中共享资源(如处理能力、磁盘存储和网络带宽),以协作文件下载和流媒体服务。在本文中,我们设计并实现了一个使用P2P方法的交互式互联网无线电系统,称为PeerIIR。当主持人、联合主持人和呼叫者同时发言时,他们将产生多个流,这些流需要传递给系统上的所有听众。这将低效地消耗网络带宽,甚至耗尽观众的链路容量。因此,如何处理同时产生的多个流,并将其高效地传递给所有受众是关键问题。当只有一个节目主机产生音频流时,构建一个分发树来分发它。如果有共同主机或呼叫者发言,则执行分布式混频器协商算法,在PeerIIR服务器之间构建语音混合树。因此,为了节省传输带宽,音频流沿着混合树进行分布式、分步混合。一系列的仿真结果表明,该方法在响应时间和链路/节点应力方面的性能比一些相关的方法有了很大的提高。
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引用次数: 0
期刊
2010 5th International ICST Conference on Communications and Networking in China
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