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2010 International Conference on Wireless Communications & Signal Processing (WCSP)最新文献

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Approach of linear phase differentiators and integrators 线性相位微分和积分器的方法
W. Lai, Lin-Chuan Tsai
In this paper, we describe wide-band differentiators and integrators the method of bilinear transformations which exhibit almost linear phases in the pass-band region. Formulations are employed to represent discrete-time infinite impulse response (IIR) processes of first-order differentiator and integrator. These formulations allow them to be eligible for wide-band applications. The new differentiator and integrator is approximately the linear phase. The maximum error of the new differentiator and is 9.5° occurring at 0.55 of the normalized frequency, and the maximum error of the new integrator is 9.5° occurring at 0.55 of the normalized frequency.
本文描述了双线性变换方法下的宽带微分器和积分器,它们在通带区域表现出几乎线性的相位。用公式来表示一阶微分和积分器的离散时间无限脉冲响应过程。这些配方使它们符合宽带应用的条件。新的微分器和积分器近似于线性相位。新的微分器和最大误差为9.5°,发生在归一化频率的0.55,新的积分器的最大误差为9.5°,发生在归一化频率的0.55。
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引用次数: 0
Improvement of ETX metric base on OLSR 基于OLSR的ETX度量改进
Yang Liu, Zhichao Mi, Jianfeng Zhang, X. Qu
This paper analyzes the problems in the wireless network caused by using minimum hop count as its routing metric, and discusses ETX metric which invented by De Couto to solve these problems and the shortage of it in mobile environment, then modifies it by relatively counting as to make it suitable for such environment. This paper uses the new ETX as a metric for the OLSR routing protocol, and proves that its capability parameters, like throughput and average packet retransmission count etc, are better than ETX proposed by De Couto in mobile environment by software simulation.
本文分析了无线网络中使用最小跳数作为路由度量所带来的问题,讨论了De Couto为解决这些问题而发明的ETX度量及其在移动环境中的不足,并对其进行了相对计数修正,使其更适合移动环境。本文将新的ETX作为OLSR路由协议的度量,并通过软件仿真证明了其吞吐量和平均数据包重传数等性能参数优于De Couto提出的ETX。
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引用次数: 6
Cyclostationary spectrum sensing for Cognitive Radio and multiantenna systems 认知无线电和多天线系统的循环平稳频谱传感
V. Kontorovich, F. Ramos-Alarcón, Oscar Filio-Rodriguez, S. Primak
In this paper it is shown that cyclostationary spectrum sensing for Cognitive Radio networks, applying multiple cyclic frequencies for single user detection can be interpreted in terms of optimal incoherent diversity addition for "virtual diversity branches" or SIMO radar. This approach allows proposing, by analogy to diversity combining, suboptimal algorithms which can provide near optimal characteristics for the Neyman-Pearson Test (NPT). The analysis is based on the Generalized Gaussian (Klovsky-Middleton) Channel Model, which allows obtaining the above mention NPT characteristics: probability of misdetection (PM) and probability of false alarm (Pfa) in the most general way. Some quasi-optimum algorithms such as energetic receiver and selection addition algorithm are analyzed and their comparison with the noise immunity properties (Receiver Operational Characteristics-ROC) of the optimum approach is provided as well.
本文表明,认知无线电网络的循环平稳频谱感知,应用多个循环频率进行单用户检测,可以用“虚拟分集分支”或SIMO雷达的最优非相干分集加法来解释。这种方法允许提出类似于多样性组合的次优算法,这些算法可以为Neyman-Pearson Test (NPT)提供接近最优的特性。该分析基于广义高斯(Klovsky-Middleton)通道模型,该模型允许以最一般的方式获得上述NPT特征:误检概率(PM)和虚警概率(Pfa)。分析了一些准最优算法,如能量接收算法和选择加法算法,并与最优算法的抗噪性能(接收机工作特性- roc)进行了比较。
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引用次数: 4
A novel beamspace eigen-filter algorithm for 2D Rake receiver 一种新的二维Rake接收机波束空间特征滤波算法
Yan Lin, Guangxin Yue
A novel beamspace eigen-fllter 2D Rake receiver for DS-CDMA communication system is proposed in this paper. The proposed algorithm's performance is very close to the optimal space-time algorithm and it can outperform the beamspace-frequency algorithm. Another advantage is that the proposed algorithm is computationally more efficient in comparing with the beamspace-frequency algorithm.
提出了一种适用于DS-CDMA通信系统的波束空间特征滤波二维Rake接收机。该算法的性能与最优空时算法非常接近,优于波束空频算法。与波束空间频率算法相比,该算法的计算效率更高。
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引用次数: 0
A simulated method of modeling wireless channel based on CDL 一种基于CDL的无线信道建模仿真方法
Jinbao Zhang, Zaichen Zhang, Xiaoyan Wang, Z. Tan, Q. Guo
Rapid development of wireless communications gives prominence to simulation. Simulated methods of modeling wireless channel are of significance to wireless communications simulation on both link and system levels. There have been quite a lot of theoretical models which have accurately described the characteristics of wireless channel. However when it comes to the realization of wireless channel in simulation, there seem no accurate enough methods and conclusions. Current simulated methods are mostly built up based on TDL, which is a common framework to model micro fading and mainly focused on micro fading. As to macro fading, Doppler-effect and polarization of electromagnetic wave, this method behaves not well enough, and other statistical approximations is indispensable, such as shadow fading, Doppler power spectrum density and so on. To the question existed, this paper proposes a simulated method to accurately model wireless channel under given wireless environment, on the basis of cluster delay line. This method is highlighted with comprehensive consideration of macro and micro fading, Doppler, multi-path and polarization effect. Analysis and simulation results on characteristics of wireless channel such as signal envelope, coherent time and bandwidth, validate the proposed model.
无线通信的飞速发展使仿真技术得到了重视。无线信道建模的仿真方法对链路级和系统级的无线通信仿真具有重要意义。已经有相当多的理论模型准确地描述了无线信道的特性。然而,在无线信道的仿真实现方面,似乎没有足够准确的方法和结论。目前的仿真方法大多是基于TDL建立的,TDL是一种常用的微衰落建模框架,主要针对微衰落问题。对于电磁波的宏衰落、多普勒效应和极化,该方法的性能不够好,需要其他的统计近似,如阴影衰落、多普勒功率谱密度等。针对存在的问题,本文提出了一种基于集群延迟线的在给定无线环境下精确建模无线信道的仿真方法。该方法综合考虑了宏微衰落、多普勒效应、多径效应和极化效应。对无线信道的信号包络、相干时间和带宽等特性进行了分析和仿真,验证了该模型的有效性。
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引用次数: 1
Energy detection of narrowband signals in cognitive radio systems 认知无线电系统中窄带信号的能量检测
Yanxin Yan, Y. Gong
In this paper, we consider energy detection based spectrum sensing for narrowband signals in a wideband cognitive radio system using OFDM. The effect of fast Fourier transform (FFT) size on detecting narrowband signals is analyzed, and appropriate FFT size is suggested to improve the probability of detection. In order to reduce complexity, an improved spectrum sensing scheme is proposed to improve the detection probability without increasing the implementation complexity. Simulations are performed to verify the presented schemes.
本文研究了基于能量检测的OFDM宽带认知无线电系统中窄带信号的频谱感知。分析了快速傅里叶变换(FFT)大小对窄带信号检测的影响,提出了适当的FFT大小以提高检测概率。为了降低复杂度,提出了一种改进的频谱感知方案,在不增加实现复杂度的前提下提高检测概率。通过仿真验证了所提方案的有效性。
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引用次数: 15
An adaptive approach to reduce complexity of EBB in LTE downlink TDD systems 一种降低LTE下行TDD系统中EBB复杂度的自适应方法
Zhixun Zhou, Xiantao Cheng, Hongxuan Liu, Gang Wu
As one kind of multiple input multiple output (MIMO) techniques in the 3GPP Long Term Evolution (LTE) and LTE-advanced (LTE-A) systems, eigenvalue based beam-forming (EBB) can maximize the system capacity in single-user scenario. Traditionally, EBB algorithm often takes singular value decomposition (SVD) to the average channel matrix of each resource block (RB) or RB-group. This method is simple but very inflexible, and sometimes it may result in unnecessary high complexity. In this paper, we propose an adaptive approach that combines first order perturbation compensation (FOPC) with traditional SVD to get the beamforming vector or precoding matrix. It has been validated by simulations that our approach can significantly reduce the implementation complexity of EBB with slight performance loss.
基于特征值的波束形成技术(EBB)作为3GPP长期演进(LTE)和LTE-a系统中的一种多输入多输出(MIMO)技术,可以最大限度地提高单用户场景下的系统容量。传统的EBB算法通常对每个资源块(RB)或RB-group的平均信道矩阵进行奇异值分解(SVD)。这种方法简单,但非常不灵活,有时可能会导致不必要的高复杂性。本文提出了一种将一阶扰动补偿(FOPC)与传统奇异值分解(SVD)相结合的自适应方法来获得波束形成矢量或预编码矩阵。仿真结果表明,该方法在性能损失较小的情况下,显著降低了EBB的实现复杂度。
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引用次数: 3
Modeling of the electromagnetic interference map generated by 3G systems inside small aircraft 小型飞机内3G系统产生的电磁干扰图建模
Clifford De Raffaele, C. J. Debono
The substantial increase in customer demand for office-like communication services during flights is pushing aircraft manufactures to implement wireless solutions inside aircraft. Nevertheless, aircraft safety is a paramount criterion for operators, thus the potential risks posed by such communication systems on aircraft equipment must be carefully assessed and respective countermeasures taken. In this work, we adopt a three-dimensional ray tracing method based on geometrical optics and combine it with electromagnetic field computation to model the interference generated by a 3G cellular system inside the cabin of a typical business jet. The model initially develops a propagation map of the electromagnetic (EM) radiation emitted by the Node B station inside the aircraft to determine the power incident on the receiving antennas of personal electronic devices (PEDs). This is used to establish the transmission power employed by each PED. Subsequently similar propagation maps are generated for each mobile device. All the radio space propagation maps are then vectorially combined to produce an EM interference map at the fuselage.
客户对飞行期间类似办公室的通信服务的需求大幅增加,促使飞机制造商在飞机内实施无线解决方案。然而,飞机安全是操作人员的首要标准,因此必须仔细评估此类通信系统对飞机设备构成的潜在风险,并采取相应的对策。本文采用基于几何光学的三维光线追踪方法,结合电磁场计算对典型公务机客舱内3G蜂窝系统产生的干扰进行建模。该模型首先绘制出飞机内部节点B站发射的电磁(EM)辐射的传播图,以确定入射到个人电子设备(ped)接收天线上的功率。这用于确定每个PED所使用的传输功率。随后,为每个移动设备生成类似的传播映射。所有的无线电空间传播图,然后矢量组合,以产生在机身的电磁干扰图。
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引用次数: 1
System info of multi-domain cognition in cognitive radio networks 认知无线电网络中多域认知的系统信息
Guoru Ding, Qi-hui Wu, Jinlong Wang, Yuping Gong
The environment cognition of cognitive radio networks (CRN) is extending from wireless domain (WD) to network domain (ND), user domain (UD) and policy domain (PD). In this paper, we propose three-layer system info of multi-domain cognition (MDC) with the characteristic of policy restriction and the capability of learning and reasoning. Especially, multi-domain local cognition (MDLC) layer performs the acquirement of mass multi-domain cognition information (CI). Integrative consideration of effective expression, efficient transfer and distributive processing, multi-domain cooperative cognition (MDCC) layer implements rational flow and fusion of CI and multi-domain initiative cognition (MDIC) layer effectively utilizes CI by prediction and reasoning. After interpreting the connotation of MDC, we also present cognition framework in space and the simple mathematic model of MDC. In addition, we present the research challenges ahead as well.
认知无线网络(CRN)的环境认知正在从无线域(WD)向网络域(ND)、用户域(UD)和策略域(PD)扩展。本文提出了具有策略约束和学习推理能力的三层多域认知系统信息。其中,多领域局部认知(MDLC)层负责大量多领域认知信息的获取。多领域协同认知(MDCC)层综合考虑有效表达、高效传递和分布式处理,实现CI的合理流动和融合,多领域主动认知(MDIC)层通过预测和推理有效利用CI。在阐释了多维数据集的内涵后,提出了多维数据集的空间认知框架和简单的数学模型。此外,我们也提出了未来的研究挑战。
{"title":"System info of multi-domain cognition in cognitive radio networks","authors":"Guoru Ding, Qi-hui Wu, Jinlong Wang, Yuping Gong","doi":"10.1109/WCSP.2010.5633635","DOIUrl":"https://doi.org/10.1109/WCSP.2010.5633635","url":null,"abstract":"The environment cognition of cognitive radio networks (CRN) is extending from wireless domain (WD) to network domain (ND), user domain (UD) and policy domain (PD). In this paper, we propose three-layer system info of multi-domain cognition (MDC) with the characteristic of policy restriction and the capability of learning and reasoning. Especially, multi-domain local cognition (MDLC) layer performs the acquirement of mass multi-domain cognition information (CI). Integrative consideration of effective expression, efficient transfer and distributive processing, multi-domain cooperative cognition (MDCC) layer implements rational flow and fusion of CI and multi-domain initiative cognition (MDIC) layer effectively utilizes CI by prediction and reasoning. After interpreting the connotation of MDC, we also present cognition framework in space and the simple mathematic model of MDC. In addition, we present the research challenges ahead as well.","PeriodicalId":448094,"journal":{"name":"2010 International Conference on Wireless Communications & Signal Processing (WCSP)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121441271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Large-scale fading model for mobile communications in disaster and salvage scenarios 灾害救援场景下移动通信的大规模衰落模型
Ling Chen, M. Loschonsky, L. Reindl
Within a running project, I-LOV, wireless communication channel model for mobile radio propagation in disaster and salvage scenarios is developed. This contribution focuses on a semi-empirical large-scale fading (LSF) model, which is able to estimate signal power loss between base station and mobile phone under debris. Due to multitude of diverse materials appearing in burying scenarios, the signal loss factor varies heavily depending on electromagnetic properties of involved materials. Additionally, highly variable shape and dimension of rubbles impact strongly the loss factor. Besides numerous LSF models investigated in urban environments, only a few are in ruins. This paper presents a novel modeling concept of LSF in catastrophe scenarios. The proposed LSF model handles the radio propagation way in two parts: outside ruins and through the ruins. Measurements have been conducted at GSM 900 and GSM 1800 bands in collapsed buildings of stratified rubbles, as well as in an avalanche scenario. The model predication fits the measured data well.
在一个正在运行的项目I-LOV中,开发了灾害和救援场景下移动无线电传播的无线通信信道模型。这一贡献侧重于一个半经验大规模衰落(LSF)模型,该模型能够估计基站和移动电话在碎片下的信号功率损失。由于埋地场景中出现的材料种类繁多,信号损耗因子在很大程度上取决于所涉及材料的电磁特性。此外,高度变化的形状和尺寸的碎石强烈影响损失系数。除了在城市环境中研究的许多LSF模型外,只有少数模型处于废墟中。本文提出了一种新的巨灾情景下LSF的建模概念。所提出的LSF模型将无线电传播方式分为遗址外和遗址内两部分进行处理。测量GSM 900和GSM 1800波段的倒塌建筑物的分层瓦砾,以及在雪崩的情况下。模型预测与实测数据拟合较好。
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引用次数: 17
期刊
2010 International Conference on Wireless Communications & Signal Processing (WCSP)
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