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2008 International Conference on Neural Networks and Signal Processing最新文献

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On the comparison of the multi-user TH-BPAM UWB system and its coded schemes 多用户TH-BPAM超宽带系统及其编码方案的比较
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590400
Xinghai Yang, Dapeng Zhang, Zhiquan Bai
In this paper, we mainly analyze the performance of the classical time hopping bipolar pulse amplitude modulation (TH-BPAM) ultra wideband system and its coded system in the multi-user case. The performance of TH-BPAM system is analyzed in detail over an ideal AWGN channel and correlation receiver. For the proposed coded scheme, the Viterbi algorithm (VA) and soft output Viterbi algorithm (SOVA) are employed in the decoding process and the upper bound and lower bound of bit error probability is presented. The analysis shows that TH-BPAM suffers performance degradation with respect to the coded TH-BPAM greatly. Furthermore, we give the computer simulation and our simulation results also prove our theoretical analysis.
本文主要分析了经典时跳双极脉冲调幅(TH-BPAM)超宽带系统及其编码系统在多用户情况下的性能。详细分析了在理想AWGN信道和相关接收机条件下TH-BPAM系统的性能。所提出的编码方案在解码过程中采用了Viterbi算法(VA)和软输出Viterbi算法(SOVA),并给出了误码概率的上界和下界。分析表明,TH-BPAM相对于编码的TH-BPAM性能下降较大。并进行了计算机仿真,仿真结果也验证了理论分析的正确性。
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引用次数: 0
Motion information based adaptive block classification for fast motion estimation 基于运动信息的自适应块分类快速运动估计
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590438
Ying Zhang, Tingzhi Shen
An object based fast search motion estimation algorithm is considered to be efficient since the computation of motion search can concentrate on blocks with moving object. However, the computational complexity of object segmentation is still too high to be applied on fast search motion estimation. In this paper, we propose an adaptive block classification algorithm. With this method, the fast search algorithm for motion estimation can make use of characteristics of motion information of the sequence being coded efficiently. In our approach, the statistical information which features the motion activities of the blocks in the previous frame is used to predict the characteristics of the motion activities of the blocks in the current frame. This is to re-assign the computation of motion search to locations that deserve to be searched more than others. Extensive experimental work has been done, results of which show that the adaptive block classification approach can accelerate the current fast search motion estimation algorithm with little decrease (0.01 dB to 0.09 dB for 8 standard test sequences) or sometimes, even increase (0.01 dB to 0.17 dB for 10 other standard test sequences) on resultant video quality, the peak signal-to-noise ratio (PSNR), while our fast algorithm is 150 times over the exhaustive full search algorithm on average.
基于目标的快速搜索运动估计算法是一种高效的运动估计算法,因为运动搜索的计算可以集中在具有运动目标的块上。然而,目标分割的计算复杂度仍然太高,无法应用于快速搜索运动估计。本文提出了一种自适应块分类算法。该方法使运动估计的快速搜索算法能够有效地利用被编码序列的运动信息特征。在我们的方法中,使用前一帧中块的运动活动特征的统计信息来预测当前帧中块的运动活动特征。这是将运动搜索的计算重新分配到值得搜索的位置。大量的实验结果表明,自适应块分类方法可以使现有快速搜索运动估计算法的视频质量和峰值信噪比(PSNR)平均提高150倍,但效果不明显(8个标准测试序列为0.01 dB ~ 0.09 dB),有时甚至可以提高(其他10个标准测试序列为0.01 dB ~ 0.17 dB)。
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引用次数: 5
Fast intra mode decision algorithm for H.263 to H.264/AVC transcoding H.263到H.264/AVC转码的快速模式内决策算法
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590434
X. Jing, W. Siu, Lap-Pui Chau, A. Constantinides
In this paper, we present a fast mode decision method for H.263 to H.264/AVC intraframe transcoding. The proposed algorithm is based on the observation that features of DCT coefficients extracted from H.263 coded intraframe strongly relates to the optimal mode in H.264/AVC intra mode decision. Specifically, the total number of non-zero AC coefficients of four 8times8 DCT blocks in H.263 is taken as a measurement in the intra block size decision. The objective is to reject improbable block types in earlier stages in order to achieve computation saving. In addition, a transform domain edge direction estimation is also adopted into our scheme to further speed up the intra mode prediction. Simulation results show that the proposed approach can reduce the computational complexity of intraframe transcoding by up to 65% while maintaining the rate-distortion (R-D) performance.
本文提出了一种H.263到H.264/AVC帧内转码的快速模式判定方法。该算法基于H.263编码帧内提取的DCT系数特征与H.264/AVC帧内模式决策的最优模式密切相关这一观察结果。具体来说,H.263中4个8times8 DCT块的非零交流系数的总数作为块内大小决策的度量。目标是在早期阶段拒绝不可能的块类型,以实现计算节省。此外,该方案还采用了变换域边缘方向估计,进一步加快了模内预测速度。仿真结果表明,该方法在保持码率失真(R-D)性能的同时,可将帧内转码的计算复杂度降低65%。
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引用次数: 3
A pre-emptive channel borrowing scheme and performance analysis for wireless overlay networks 一种无线覆盖网络的先发制人信道借用方案及性能分析
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590420
Chuan-jiang Yan, Fang-ming Zhao, Wei Wang, Di He
In this paper, channel allocation scheme is studied for overlay wireless networks to optimize connection-level QoS. The contributions of our work are threefold. First, channel allocation scheme using both horizontal channel borrowing and vertical channel borrowing is presented and analyzed. When all the channels in a given cell are used, handoff requests can borrow channels from adjacent homogeneous cells. In case that the horizontal borrowing requests fail, handoff requests may also borrow channels from heterogeneous cells. Second, to further improve the system performance, other priority strategies such as channel reservation and pre-emptive priority are introduced. And third, to meet the high QoS requirements of some services and increase the utilization of radio resources, certain services can be transformed between real-time services and non-real-time services as necessary. Simulation results demonstrate that the proposed schemes can improve system performance.
本文研究了覆盖无线网络的信道分配方案,以优化连接级QoS。我们的工作有三方面的贡献。首先,提出并分析了横向渠道借用和纵向渠道借用的渠道分配方案。当给定单元中的所有通道都被使用时,切换请求可以从相邻的同类单元中借用通道。在水平借用请求失败的情况下,切换请求也可能从异构单元借用通道。其次,为了进一步提高系统性能,引入了通道预留和抢占优先级等其他优先级策略。第三,为了满足某些业务的高QoS要求,提高无线电资源的利用率,可以根据需要在实时业务和非实时业务之间进行转换。仿真结果表明,所提方案能够提高系统性能。
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引用次数: 1
Study on feature select based on coalitional game 基于联合博弈的特征选择研究
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590390
Jihong Liu, Soo-Young Lee
Feature selection is an important processing step in machine learning. Most used feature selection methods choose top-ranking features without considering the relationships among features. In this paper, the signification of feature selection is introduced, and the goal and evaluation criteria of feature selection are analyzed. The coalitional game theory related to the feature selection is explained. An algorithm of coalitional game based feature selection (CGFS) is presented. This work focus on selecting a sub-feature set in which the selected features are coalitional and relevant in order to obtain better classification performance. The experimental results show that CGFS obtains better performance than MI.
特征选择是机器学习中一个重要的处理步骤。大多数常用的特征选择方法在不考虑特征之间的关系的情况下选择排名靠前的特征。介绍了特征选择的意义,分析了特征选择的目标和评价标准。解释了与特征选择相关的联合博弈论。提出了一种基于联合博弈的特征选择算法。这项工作的重点是选择子特征集,其中选择的特征是联合的和相关的,以获得更好的分类性能。实验结果表明,CGFS比MI具有更好的性能。
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引用次数: 8
Exploring complex networks by thermal flux spreading 利用热通量扩散探索复杂网络
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590302
Yi Shen, Wenjiang Pei, Tao Li, Jiming Liu, Lei Yang, Shao-ping Wang, Zhenya He
Thermal conduction physical method based on finite element model (FEM) is utilized in searching for the shortest path between two nodes in complex networks. The thermal flux matrix of nodes is constructed, and the element with the maximal value in each node thermal flux vector indicates one section of the shortest path to the source node. Theoretical analysis and experimental results show that the strategy can avoid the problem of bringing high flux of inquiring data packet into network and the correct shortest path form source node to any other nodes can be found simultaneously. The shortest path from the source node to any other nodes can be found in time O(mt/Deltat), where m is the number of edges, t is the conduction time, Deltat is the integral interval, which is essentially in linear time with m, and all the shortest path between any two nodes can be found in time O(nmt/2Deltat).
利用基于有限元模型的热传导物理方法求解复杂网络中两个节点之间的最短路径。构造节点的热通量矩阵,每个节点的热通量向量中值最大的元素表示到源节点的最短路径的一段。理论分析和实验结果表明,该策略可以避免将查询数据包引入网络的高流量问题,并且可以同时找到源节点到任何其他节点的正确最短路径。从源节点到任何其他节点的最短路径都可以在时间O(mt/ delta)内找到,其中m为边数,t为传导时间,delta为积分区间,本质上与m呈线性关系,任意两个节点之间的所有最短路径都可以在时间O(nmt/ 2delta)内找到。
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引用次数: 0
Policy-based radio resource allocation for wireless mobile networks 基于策略的无线移动网络无线资源分配
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590396
Fang-ming Zhao, Ling-ge Jiang, Chen He
For a wireless cell, the arrival rate and the proportion of different kind of service are diverse on distinct time in a day. This means that single resource allocation method can not efficiently utilize the radio resource all the time. Taking these matters into account, a policy-based radio resource allocation scheme is presented, in which the characteristic of wireless traffic is analyzed and the corresponding traffic model is described. To improve system performance, different channel allocation algorithms and channel allocation strategies are introduced. Their combinations form a series of policies. These policies are put into a policy list and constitute a policy-based channel allocation scheme. According to defined conditions such as network load, system can dynamically choose appropriate policy from the policy list. Simulation results demonstrate that better system performance can be improved by using policy mechanism, e.g. policy mechanism can lower blocking probability.
对于一个无线小区来说,在一天中的不同时间,不同业务的到达率和比例是不同的。这意味着单一的资源分配方法不能始终有效地利用无线电资源。考虑到这些问题,提出了一种基于策略的无线资源分配方案,该方案分析了无线业务的特点,描述了相应的业务模型。为了提高系统性能,引入了不同的信道分配算法和信道分配策略。它们的组合形成了一系列的政策。将这些策略放入策略列表中,构成基于策略的通道分配方案。系统可以根据网络负载等已定义的条件,从策略列表中动态选择合适的策略。仿真结果表明,采用策略机制可以提高系统性能,例如策略机制可以降低阻塞概率。
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引用次数: 12
Task performance evaluation for virtual organizations 虚拟组织的任务绩效评价
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590429
Tang Yongli, Hu Xinyue, L. Congdong
Task performance evaluation for virtual organizations (VOs) with incomplete and uncertain information about the partners and their performance is investigated. Task performance criteria hierarchy for VOs is established, which is comprised of the quality indicators, the cost indicators, the cooperative satisfaction indicators and the other task-specific indicators. Task performance evaluation approach is constructed based on fuzzy evaluation method. The proposed approach is composed of 6 steps: establish task evaluation criteria hierarchy; develop the scoring scale and standards; determine the weights of the criteria; obtain the fuzzy relation matrixes; compute the fuzzy synthetic evaluation vector; and aggregate task performance indicator value. A numerical example is given to illustrate the proposed approach. The task performance evaluation results can be used as the basis of task performance control and incentive mechanisms for VOs.
研究了具有不完全和不确定合作伙伴及其绩效信息的虚拟组织任务绩效评价问题。建立了由质量指标、成本指标、合作满意度指标和其他特定任务指标构成的任务绩效标准层次。基于模糊评价法构建了任务绩效评价方法。该方法由6个步骤组成:建立任务评价标准层次;制定评分量表和评分标准;确定标准的权重;得到模糊关系矩阵;计算模糊综合评价向量;和汇总任务绩效指标值。最后给出了一个数值算例。任务绩效评价结果可作为任务绩效控制和激励机制的依据。
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引用次数: 1
Butterfly-scroll attractor secure communication design and implementation 蝴蝶涡旋吸引器安全通信设计与实现
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590349
Jianliang Zhu, Shouqiang Kang, Yujing Wang
According to the drive-respond synchronization method presented by Pecora and Carroll, chaotic masking communication circuits, which generate butterfly-scroll attractor, are designed, and masking principle is analyzed. Computer simulation has been done to the butterfly-scroll attractor of the circuit, and experimental study to the hardware circuitry of the chaotic secure communications, the element parameters and waveforms are presented. The results show that the chaotic circuit can realize secure communication, when the frequency of the input square wave signal is less than 20 MHZ.
根据Pecora和Carroll提出的驱动-响应同步方法,设计了产生蝴蝶涡旋吸引子的混沌掩蔽通信电路,并分析了掩蔽原理。对该电路的蝴蝶涡旋吸引器进行了计算机仿真,并对混沌保密通信的硬件电路进行了实验研究,给出了元件参数和波形。结果表明,当输入方波信号的频率小于20mhz时,混沌电路可以实现安全通信。
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引用次数: 1
Explicit construction of compactly supported biorthogonal multiwavelets based on the matrix extension 基于矩阵扩展的紧支持双正交多小波的显式构造
Pub Date : 2008-06-07 DOI: 10.1109/ICNNSP.2008.4590368
Y. Cen, L. Cen
Polyphase matrix extension of the scaling vector functions plays an important role in the construction of compactly supported biorthogonal multiwavelets. However, the involved computations are rather complex, and there is no unified, direct formula available so far. In this paper, by studying the canonical forms and the product preserving transformations of the polyphase matrices, an abstract algebraic approach for the matrix extension problem is proposed. More important, explicit formulas for the construction problem are represented via the submatrices of the polyphase matrices of scaling vector functions directly. Furthermore, complete solution set can be obtained from these explicit formulas via product preserving transformations. Computational examples demonstrate that by using the explicit formulas, our matrix extension algorithm is direct and effective.
尺度向量函数的多相矩阵扩展在紧支撑双正交多小波的构造中起着重要的作用。然而,所涉及的计算相当复杂,目前还没有统一的、直接的公式。本文通过研究多相矩阵的正则形式和保积变换,给出了矩阵扩展问题的抽象代数方法。更重要的是,构造问题的显式公式直接通过缩放向量函数的多相矩阵的子矩阵表示出来。进一步,通过保积变换,可以得到这些显式公式的完全解集。算例表明,利用显式公式,我们的矩阵扩展算法是直接有效的。
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引用次数: 2
期刊
2008 International Conference on Neural Networks and Signal Processing
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