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2013 9th International Conference on Information, Communications & Signal Processing最新文献

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Localization mechanism applying mobile reference into grid-based wireless sensor networks 在基于网格的无线传感器网络中应用移动参考的定位机制
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782949
Ying-Hong Wang, Yu-Jie Lin, Han-Ming Chang
Wireless sensor networks (WSNs) are based on monitoring or managing the sensing area by using the location information with sensor nodes. Most sensor nodes need hardware support or receive packets with location information to estimate their location, and this needs lots of time or costs, and may have a huge error. In this paper we present a localization mechanism in wireless sensor networks (MRN). We use a mobile reference node with GPS to move to the whole environment, and we use RSSI and trilateration to estimate unknown nodes' location. We can obtain more unknown nodes location by mobile reference node moving scheme, and will decreases the energy consumption and average location error.
无线传感器网络是利用传感器节点的位置信息对感知区域进行监控或管理的网络。大多数传感器节点需要硬件支持或接收带有位置信息的数据包来估计其位置,这需要大量的时间或成本,并且可能存在巨大的误差。本文提出了一种无线传感器网络(MRN)定位机制。我们使用带有GPS的移动参考节点移动到整个环境,并使用RSSI和三边测量来估计未知节点的位置。通过移动参考节点移动方案可以获得更多的未知节点位置,降低了能量消耗和平均定位误差。
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引用次数: 1
Green backhauling for heterogeneous mobile access networks: What are the challenges? 异构移动接入网络的绿色回程:挑战是什么?
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782868
F. Farias, P. Monti, A. Vastberg, M. Nilson, Joao W. Costa, L. Wosinska
Heterogeneous network (HetNet) deployment strategies have the potential to improve the energy efficiency of mobile access networks. One key aspect to consider in HetNets is the impact of the power consumption of the backhaul, i.e., the overall energy efficiency of a HetNet deployment is affected by the backhaul technology and architecture. This paper presents a preliminary assessment of the design challenges of a future green backhaul segment for a HetNet deployment. The study is based on the analysis of the medium term future outlook (i.e., between now and the year 2025) of the main technologies used in todays'* backhaul networks (i.e., fiber, microwave and copper). It can be concluded that, even if there arc no doubts that both microwave and fiber will be predominately used in the future, the possible migration paths leading to such fiber- and microwave-dominated scenarios might be different, depending on factors such as spectrum and license costs, time to deployment, availability of equipment, and required Quality of Service (QoS) levels.
异构网络(HetNet)部署策略有可能提高移动接入网的能源效率。在HetNets中需要考虑的一个关键方面是回程功耗的影响,即,HetNet部署的整体能源效率受到回程技术和架构的影响。本文提出了对未来HetNet部署的绿色回程部分的设计挑战的初步评估。这项研究是基于对当前回程网络(即光纤、微波和铜线)中使用的主要技术的中期未来前景(即从现在到2025年)的分析。可以得出的结论是,即使毫无疑问,微波和光纤在未来都将占主导地位,但根据频谱和许可成本、部署时间、设备可用性和所需的服务质量(QoS)水平等因素,导致光纤和微波占主导地位的场景的可能迁移路径可能会有所不同。
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引用次数: 17
Adaptive Fourier analysis using a variable step-size LMS algorithm 使用可变步长LMS算法的自适应傅立叶分析
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782813
Yegui Xiao, Boyan Huang, Hongyun Wei
Adaptive Fourier analysis has numerous applications in biomedical engineering, music signal processing, digital communications, power engineering etc. So far, a lot of adaptive algorithms and systems have been developed and applied. In this paper, a variable step-size LMS (VSS-LMS) algorithm is proposed for adaptive Fourier analysis of noisy sinusoidal signals. It significantly outperforms the conventional LMS and p-power algorithms in both stationary and nonstationary environments at the expense of very little increase in computational cost. Extensive simulations as well as application to real noise signals generated by large-scale factory rotating machines are conducted to confirm the improved performance and tracking capabilities of the proposed algorithm.
自适应傅立叶分析在生物医学工程、音乐信号处理、数字通信、电力工程等领域有着广泛的应用。到目前为止,已经开发和应用了许多自适应算法和系统。本文提出了一种可变步长LMS (VSS-LMS)算法,用于噪声正弦信号的自适应傅里叶分析。它在平稳和非平稳环境中都明显优于传统的LMS和p-power算法,而计算成本的增加很少。通过大量的仿真以及对大型工厂旋转机械产生的真实噪声信号的应用,验证了所提算法改进的性能和跟踪能力。
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引用次数: 5
A modified power-level-difference-based noise reduction for dual-microphone headsets 改进的基于功率级差分的双麦克风降噪方案
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782820
Shiwei Wang, Xiaohu Hu, C. Zheng, Xiaodong Li
This paper studies the performance of the power-level-difference(PLD)-based two-channel noise reduction for dual-microphone headsets by using Monte Carlo simulation method. The analysis results indicate that both the accuracy of the noise power spectral density (NPSD) estimation and the smoothing factor have significant impacts on the amount of noise reduction. Based on these analysis results, a modified PLD-based two-channel noise reduction algorithm is proposed, where two schemes are introduced to improve the performance of the traditional PLD-based algorithm. In the first scheme, a non-stationary noise estimator is proposed to improve the tracking capability of the NPSD estimator. In the second scheme, an adaptive updating smoothing factor (AUSF) is used to reduce the variance of the spectral estimation and increase the amount of noise reduction. Experimental results with recorded data show better performance of the proposed algorithm.
本文采用蒙特卡罗仿真方法研究了基于功率级差(PLD)的双通道双麦克风耳机降噪性能。分析结果表明,噪声功率谱密度(NPSD)估计的精度和平滑系数对降噪量有显著影响。基于这些分析结果,提出了一种改进的基于pld的双通道降噪算法,其中引入了两种方案来提高传统的基于pld的算法的性能。在第一种方案中,提出了一个非平稳噪声估计器来提高NPSD估计器的跟踪能力。在第二种方案中,采用自适应更新平滑因子(AUSF)来减小谱估计的方差,增加降噪量。实验结果表明,该算法具有较好的性能。
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引用次数: 2
VLSI design of Extreme Value Detection based fast algorithm for H.264/AVC intra prediction 基于极值检测的H.264/AVC帧内快速预测算法的VLSI设计
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782829
Chen-Hsien Miao, Chih-Peng Fan
In this paper, an efficient fast algorithm called Boundary-aided Extreme Value Detection (BEVD) is applied to predict the best direction mode, excluding the DC mode, for H.264/AVC fast intra-mode decision. The BEVD-based two-step edge detection can predict luma-4×4, luma-16×16, and chroma-8×8 modes effectively. Simulation results show that the proposed BEVD method reduces encoding time by 63 %, and requires a bit-rate increase of approximately 1.7 %, and a decrease in peak signal-to-noise ratio (PSNR) by approximately 0.06 dB in CIF sequences, compared with the H.264/AVC JM 14.2 software. The proposed BEVD processor includes the memory unit, the system controller, and the BEVD core module. With TSMC 0.18 μm CMOS process, the proposed BEVD processor requires 16.4 K gates and performs the maximum operational frequency up to 71 MHz, and can be applied to the real-time HD format video encoding.
本文采用边界辅助极值检测(BEVD)算法预测H.264/AVC快速模内决策中除DC模式外的最佳方向模式。基于bevd的两步边缘检测可以有效地预测luma-4×4、luma-16×16和chroma-8×8模式。仿真结果表明,与H.264/AVC JM 14.2软件相比,所提出的BEVD方法在CIF序列中编码时间缩短63%,码率提高约1.7%,峰值信噪比降低约0.06 dB。所提出的BEVD处理器包括存储单元、系统控制器和BEVD核心模块。该BEVD处理器采用台积电0.18 μm CMOS工艺,需要16.4 K栅极,最大工作频率高达71 MHz,可用于实时高清格式视频编码。
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引用次数: 0
Designs of FIR filters with optimized group delay 群延迟优化FIR滤波器的设计
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782852
A. Jiang, H. Kwan, Yanping Zhu
In this paper, a novel method is proposed to design FIR filters. In our designs, the objective is to reduce the minimax approximation error of an FIR filter subject to peak error constraints imposed on group delays in passbands. Starting from an initial design, the proposed method employs an iterative procedure. In each iterative step, a nonlinear equation is solved to make group delay constraints satisfied. Simulation results demonstrate that the proposed method can achieve FIR filters which satisfy group delay constraints arbitrarily specified in passbands.
本文提出了一种设计FIR滤波器的新方法。在我们的设计中,目标是减少FIR滤波器的最小最大近似误差,该滤波器受通频带中施加的群延迟的峰值误差约束。该方法从初始设计出发,采用迭代过程。在每个迭代步骤中,求解一个非线性方程以满足群延迟约束。仿真结果表明,该方法可以实现满足任意通带群延迟约束的FIR滤波器。
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引用次数: 1
A comb filter with adaptive notch bandwidth for periodic noise reduction 具有自适应陷波带宽的梳状滤波器,用于周期性降噪
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782856
Yosuke Sugiura, A. Kawamura, N. Aikawa
This paper proposes a comb filter with adaptive notch bandwidth. The comb filter is used to reduce a periodic noise from an observed signal. To extract the desired signal completely, we should appropriately design the notch bandwidth of the comb filter. Specifically, we should design the notch bandwidth to be equal to the fluctuation bandwidth. In this paper, to automatically reduce only the periodic noise with the frequency fluctuation, we propose the comb filter which achieves the adaptive notch bandwidth. Simulation results show the effectiveness of the proposed comb filter.
提出了一种自适应陷波带宽的梳状滤波器。梳状滤波器用于减少观测信号中的周期性噪声。为了完全提取期望的信号,我们应该合理设计梳状滤波器的陷波带宽。具体来说,我们应该将陷波带宽设计为等于波动带宽。本文提出了一种梳状滤波器,可以实现陷波带宽的自适应,从而实现对周期性噪声的自动降噪。仿真结果表明了所提出的梳状滤波器的有效性。
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引用次数: 8
Multi-objects classification via optimized compressive sensing projection 基于优化压缩感知投影的多目标分类
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782802
Aihua Yu, Huang Bai, Qianru Jiang, Zhihui Zhu, Chaogeng Huang, Gang Li, Beiping Hou
The theory of compressive sensing (CS) enables the reconstruction of a sparse signal from highly compressed data. However, in many applications, we are ultimately interested in information retrieval rather than signal reconstruction. In this paper, we study the problem of multi-objects classification in compressive sensing systems. Theoretical error bounds are derived based on the analysis of classical compressive classification. The optimal projection matrix design problem is studied and an algorithm is derived to solve the corresponding problem. Application in the identification of license plate numbers is considered and simulation results show that the projection measurement obtained using the proposed algorithm significantly improve the classification performance in terms of classification error rate.
压缩感知(CS)理论能够从高度压缩的数据中重建稀疏信号。然而,在许多应用中,我们最终感兴趣的是信息检索而不是信号重建。本文研究了压缩感知系统中的多目标分类问题。在分析经典压缩分类方法的基础上,导出了理论误差范围。研究了最优投影矩阵设计问题,并推导了求解该问题的算法。将该算法应用于车牌号码识别中,仿真结果表明,该算法得到的投影量在分类错误率方面显著提高了分类性能。
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引用次数: 1
Levy walk based multi-hop data forwarding protocol for Opportunistic Mobile Phone Sensor Networks 机会移动电话传感器网络中基于Levy行走的多跳数据转发协议
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782951
M. Thejaswini, P. Rajalakshmi, U. Desai
Unstable link connectivity due to dynamic mobility nature of mobile phone users and error prone wireless link quality increases end-to-end delay for mobile phone based opportunistic network applications. This problem becomes more worse in the presence of large amount of data transmission, like multimedia data. This paper refers to Levy walk based multi-hop data forwarding protocol called Data Transmission Time and Human Walk Velocity (DTT-HWV) for Opportunistic Mobile Phone Sensor Networks (OMPSN). This paper, in particular evaluates the performance of proposed protocol in terms of end-to-end waiting time to receive data, which is an important QoS requirement for data transmission in opportunistic networks. The proposed protocol DTT-HWV reduces end-to-end waiting time to receive data compared to Random Progress (RP) data forwarding method in presence of low battery power and high path loss. Obtained results are helpful in designing and building of large scale data retrieval services for opportunistic networks involving humans in the communication network loop.
由于移动电话用户的动态移动性和易出错的无线链路质量导致的链路连接不稳定增加了基于移动电话的机会网络应用的端到端延迟。在大量数据传输(如多媒体数据)的情况下,这个问题变得更加严重。本文研究了一种基于Levy行走的多跳数据转发协议,称为机会手机传感器网络(OMPSN)的数据传输时间和人类行走速度(DTT-HWV)。本文特别从端到端接收数据的等待时间方面评估了所提出协议的性能,这是机会网络中数据传输的重要QoS要求。在低电池电量和高路径损耗的情况下,与随机进度(RP)数据转发方法相比,所提出的DTT-HWV协议减少了端到端接收数据的等待时间。所得结果对通信网络环路中涉及人的机会网络的大规模数据检索服务的设计和构建具有指导意义。
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引用次数: 2
10-Gb/s/channel WDM PON using ultra-narrow spectrum-sliced incoherent light source 10gb /s/信道WDM PON采用超窄频谱切片非相干光源
Pub Date : 2013-12-01 DOI: 10.1109/ICICS.2013.6782796
Hoon Kim
We present the use of an ultra-narrow spectrum-sliced incoherent light source for transmission of 10-Gb/s non-return-to-zero signals for wavelength-division-multiplexed passive optical networks. In this light source, a broadband amplified spontaneous emission noise is spectrum-sliced by an ultra-narrow filter and then fed to a gain-saturated semiconductor optical amplifier to suppress the excess intensity noise of the incoherent light. 10-Gb/s modulation is followed using a polarization-insensitive optical modulator. Thanks to the ultra-narrow linewidth of the source (~0.01 nm), not only is the 10-Gb/s incoherent signal successfully transmitted over 20-km standard single-mode fiber without any dispersion compensation, but also retains the noise suppression after passing through a 0.2-nm-bandwidth narrow optical filter. Two different line rates of 10.7 and 12.5 Gb/s are experimentally demonstrated, assuming 7% and 25% forward error correction, respectively. Also presented is the 10-Gb/s upstream transmission over a loopback configured network.
我们提出了在波分复用无源光网络中使用超窄频谱切片非相干光源传输10gb /s不归零信号。在该光源中,宽带放大的自发发射噪声通过超窄滤波器进行频谱切片,然后馈送到增益饱和的半导体光放大器,以抑制非相干光的过量强度噪声。10gb /s调制之后使用偏振不敏感光调制器。由于源的线宽超窄(~0.01 nm),在没有色散补偿的情况下,10gb /s的非相干信号在20km标准单模光纤上成功传输,并且通过0.2 nm带宽的窄滤光片后仍能保持噪声抑制。实验证明了两种不同的线速率分别为10.7和12.5 Gb/s,分别假设7%和25%的前向纠错。还介绍了在环回配置网络上的10gb /s上行传输。
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引用次数: 1
期刊
2013 9th International Conference on Information, Communications & Signal Processing
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