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2008 The Fourth International Conference on Wireless and Mobile Communications最新文献

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A Comparative Analysis of the Resource Consumption in Message Oriented Middleware with XML and Binary Encoded Messages 基于XML和二进制编码消息的面向消息中间件资源消耗的比较分析
T. Aihkisalo, P. Valitalo
The XML coded information is notorious for its verbosity over the actual effective payload. The solution for reducing the verbosity and the performance cost of XML has been the use of the alternative encoding schemes, other than pure text. The processing of the XML using computing resources sparingly is even more important in embedded, and otherwise restricted environments, when the services of the enterprise domain are extended to the mobile wireless domain. This paper presents and studies the empirical results of computational resource consumption by benchmarking of an implementation of the Message Oriented Middleware, MOM. This MOM solution defines and implements a service and application level messaging protocol and appropriate middleware. The benchmarked MOM implementation provides XML and two alternative binary encoding presentations for the messages, a proprietary binary encoding and an XBIS encoding. The message encoding schemes are compared by considering message compression, protocol overhead and measured computing resource usage. The measured computing resource usage includes CPU processing load and memory consumption. The results show the advantage of the binary encoding over the traditional XML, in most cases. However, the study also showed how XML is preferred for the lengthy messages that have a higher share of payload data.
XML编码的信息因其比实际有效负载冗长而臭名昭著。减少XML冗长性和性能成本的解决方案是使用替代的编码模式,而不是纯文本。当企业领域的服务扩展到移动无线领域时,在嵌入式和其他受限制的环境中,节省使用计算资源处理XML更加重要。本文通过对一个面向消息的中间件(Message Oriented Middleware, MOM)的实现进行基准测试,给出并研究了计算资源消耗的实证结果。此MOM解决方案定义并实现了服务和应用程序级消息传递协议以及适当的中间件。基准化的MOM实现为消息提供了XML和两种可选的二进制编码表示,一种是专有二进制编码,一种是XBIS编码。通过考虑消息压缩、协议开销和测量的计算资源使用情况,对消息编码方案进行了比较。测量的计算资源使用情况包括CPU处理负载和内存消耗。结果显示,在大多数情况下,二进制编码优于传统的XML。然而,该研究还显示了XML如何更适合具有较高负载数据份额的长消息。
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引用次数: 2
Security Analysis of Interleave-Division Multiple Access: Next Generation Competitor 交错多址:新一代竞争对手的安全性分析
A. Basharat, I. Khokhar, S. Murtaza
Interleave Division Multiple Access (IDMA) is one of the competitors for next generation wireless systems. IDMA not only inherits all the advantages of CDMA but also has the capability to overcome its deficiencies. In this paper, security analysis of IDMA system has been carried out through NIST tests and it has been found that it is highly secure on its own, not requiring any additional security device. In other words, IDMA exhibits security features of an efficient crypto system.
交错分路多址(IDMA)是下一代无线系统的竞争对手之一。IDMA不仅继承了CDMA的所有优点,而且有能力克服CDMA的不足。本文通过NIST测试对IDMA系统进行了安全性分析,发现其本身具有很高的安全性,不需要任何额外的安全设备。换句话说,IDMA具有高效加密系统的安全特性。
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引用次数: 2
A Mobile Agent Enabled Wireless Sensor Network for River Water Monitoring 基于移动代理的河水监测无线传感器网络
T. Kotsilieris, G. Karetsos
Environmental pollution is becoming a very crucial concern of our society. Water is one of the most important natural resources and has been at risk for some years now. Polluted water affects people's health and the flora - fauna of the ecosystem. Thus, water supplies monitoring, become increasingly essential for public health. The objective of this work is to properly blend systems at the edge of technology (i.e. mobile agents, wireless networks, sensors, intelligent systems) in order to form an adaptive and autonomous system for supporting advanced management services of environmental data and information mining. The proposed architecture is based on MAs (mobile agents) due to their ability to offer reliable, scalable and failover applications. The minimisation of task completion delay is considered as evaluation metric and early experimental results depict that the MA paradigm outperforms compared with classic client / server architecture.
环境污染正成为我们社会非常关注的问题。水是最重要的自然资源之一,多年来一直处于危险之中。被污染的水影响人们的健康和生态系统的动植物群。因此,供水监测对公共卫生越来越重要。这项工作的目标是适当地融合技术边缘系统(即移动代理,无线网络,传感器,智能系统),以形成一个自适应和自主的系统,以支持先进的环境数据和信息挖掘管理服务。所提议的体系结构基于MAs(移动代理),因为它们能够提供可靠、可扩展和故障转移应用程序。任务完成延迟的最小化被认为是评估指标,早期的实验结果表明,与传统的客户机/服务器架构相比,MA范式优于传统的客户机/服务器架构。
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引用次数: 14
Wireless TCP-Friendly Rate Control over the DCCP Transport Protocol 基于DCCP传输协议的无线tcp友好速率控制
Shiva Safaripour Khanloo, M. Fathy, M. Soryani
TCP-Friendly Rate control (TFRC) is a Loss based rate control mechanism. It uses TCP equation throughput for calculating the sending rate. This equation is a function of loss event rate. TFRC assumes any lost packet as a signal of network congestion and correspondingly reduces its transmission rate. But in wireless links the packet may be lost by handoffs and error prone wireless links. So there should be a way to distinguish congestion loss from wireless loss for improving performance of TFRC flows in wireless networks. In this paper, we detect real congestion by ECN marking capability of RED routers and we update the new loss interval length for measuring the loss event rate only when we detect real congestion. Simulation results show that our technique effectively alleviates the throughput degradation caused by wireless losses and they show better performance for our proposal. Also our proposal maintains TCP-Friendliness.
TCP-Friendly Rate control (TFRC)是一种基于Loss的速率控制机制。它使用TCP方程吞吐量来计算发送速率。这个方程是损失事件率的函数。TFRC假定任何丢失的数据包都是网络拥塞的信号,并相应降低其传输速率。但是在无线链路中,数据包可能会因切换和容易出错的无线链路而丢失。因此,为了提高无线网络中TFRC流的性能,应该有一种区分拥塞损失和无线损失的方法。本文利用RED路由器的ECN标记能力检测真正的拥塞,并在检测到真正的拥塞时更新用于度量损失事件率的新的损失间隔长度。仿真结果表明,该方法有效地缓解了由于无线损耗而导致的吞吐量下降,并为我们的方案提供了更好的性能。此外,我们的建议保持tcp友好。
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引用次数: 8
NAES: Natural Adaptive Exponential Smoothing Algorithm for WLAN Channel Prediction in Mobile Environment 移动环境下无线局域网信道预测的自然自适应指数平滑算法
Jeandro M. Bezerra, Rudy Braquehais, F. Roberto, Jorge Silva, M. Fernandez, Thelmo P. de Araujo, Celestino Junior
The advent of wireless networks has increased the demand for research. Context-aware applications must adapt to the environment in which they are inserted, and, for this, information on both device's hardware and the characteristics of the environment is crucial. In this work, we propose a method - called natural adaptive exponential smoothing algorithm (NAES) - to describe and forecast, in real time, the channel behavior of IEEE 802.11 WLAN networks. The NAES method uses a variation of the exponential smoothing technique to compute the channel quality indicators, namely the signal strength and the link quality. A comparison with the results obtained by other linear prediction methods shows that NAES outperforms them.
无线网络的出现增加了对研究的需求。上下文感知应用程序必须适应它们所处的环境,为此,有关设备硬件和环境特征的信息至关重要。在这项工作中,我们提出了一种称为自然自适应指数平滑算法(NAES)的方法来实时描述和预测IEEE 802.11 WLAN网络的信道行为。NAES方法使用指数平滑技术的一种变体来计算信道质量指标,即信号强度和链路质量。与其他线性预测方法的结果比较表明,NAES的预测效果优于其他线性预测方法。
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引用次数: 3
A Study on Hidden Receiver Problem in Mobile Ad Hoc Networks 移动自组网中隐藏接收机问题的研究
Chun-Chih Lo, Chao-Yu Kuo, Yi-Hung Huang, Kuan-Cheng Lin, Y. Chu
The hidden receiver problem is the primary concern in mobile ad hoc networks (MANET), due to the high rates of neglecting the state of the hidden terminal; the potential sender (neighbors of the hidden terminal) enters into an unnecessary backoff process and retransmission circle, therefore leading to serious unfairness between contention terminals. Hidden receiver problem increases the probability of collision and interference, hence, degrading the performance of network throughput significantly. In this paper, we proposed two improved schemes with an additional procedure which can be adapted to IEEE 802.11 Distributed Coordination Function (DCF) and Explicit Blocking Notification (EBN) schemes. Simulation results have shown that our proposed schemes not only achieve better fairness between competing traffics but also greatly improves system throughput.
隐藏接收器问题是移动自组网(MANET)中最受关注的问题,由于隐藏终端的状态被忽略的比率很高;潜在发送方(隐藏终端的邻居)进入了不必要的退避过程和重传循环,从而导致竞争终端之间的严重不公平。隐藏接收器问题增加了碰撞和干扰的概率,从而显著降低了网络吞吐量的性能。在本文中,我们提出了两种改进方案,增加了一个额外的过程,可以适应IEEE 802.11分布式协调函数(DCF)和显式阻塞通知(EBN)方案。仿真结果表明,我们提出的方案不仅在竞争业务之间实现了更好的公平性,而且大大提高了系统吞吐量。
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引用次数: 9
DSP Design and Implementation for the UE Modem Controller of the 3G Long-Term Evolution 3G长期演进的UE调制解调器控制器的DSP设计与实现
Ok-Sun Park, Jae-kyung Lee, H. Park, Jaemin Ahn
The 3G LTE will provide the increased data rates, improved coverage, improved spectrum efficiency and reduced latency with adapting various transmission parameters for high-speed data transmission. Accordingly, we suggest an efficient method for controlling FPGAs in the user equipment of the 3G LTE. Our proposed DSP software design, the UE Modem Controller, reduces processing latency for controlling modem hardware since it has been designed as interrupt service routines based on its functions and FPGAspsila operation timing. Furthermore, it performs complex computations required in FPGAs and store various physical parameters to control UE modem at the right time.
3G LTE将提供更高的数据速率、更大的覆盖范围、更高的频谱效率和更低的延迟,通过适应各种传输参数来实现高速数据传输。据此,我们提出了一种有效的控制3G LTE用户设备中fpga的方法。我们提出的DSP软件设计,即UE调制解调器控制器,减少了控制调制解调器硬件的处理延迟,因为它被设计为基于其功能和fpga操作时序的中断服务例程。此外,它执行fpga所需的复杂计算并存储各种物理参数,以便在适当的时间控制UE调制解调器。
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引用次数: 1
Distributed Resource and Routing Assignment Algorithms for Multi-channel WMNs 多信道WMNs的分布式资源和路由分配算法
Y. Wen, T. Anderson
Guarantees on quality-of-service (QoS) are essential for multimedia applications such as wireless TV and VoIP (voice over IP) to be successfully utilized over a WMN (Wireless Mesh Networks). As a consequence of providing Internet access to many clients over such a network, throughput is affected by the number of hops that a client is from its backhaul and how traffic load distributing. These spatial bias and load- balancing problems are formulated as a mixed-integer nonlinear programming problem that take into consideration the multi-hop delay, both in terms of least-hop and load-balanced routing, and in terms of link capacity constraints in mesh structures. In this paper, we proposed distributed resource allocation scheme and load-balanced routing algorithms combining with Lagrangean Relaxation approach that minimize the maximum multi-hop delay at the MAC layer and network layer, algorithms that achieve load-balanced on each backhaul and each branch of the backhaul with orthogonal channels. Our experiment results demonstrate that the algorithms achieve near-minimum multi- hop delay and outperform other resource allocation schemes and routing algorithms.
保证服务质量(QoS)对于多媒体应用程序(如无线电视和VoIP (IP语音))在WMN(无线网状网络)上的成功利用至关重要。通过这样一个网络向许多客户机提供Internet访问的结果是,吞吐量受到客户机从其回程的跳数以及流量负载分布方式的影响。这些空间偏差和负载均衡问题被表述为考虑多跳延迟的混合整数非线性规划问题,包括最小跳和负载均衡路由,以及网格结构中的链路容量约束。本文提出了分布式资源分配方案和负载均衡路由算法,并结合拉格朗日松弛法在MAC层和网络层使最大多跳延迟最小化,在每个回程上实现负载均衡的算法,以及回程各分支具有正交信道的算法。实验结果表明,该算法实现了接近最小的多跳延迟,优于其他资源分配方案和路由算法。
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引用次数: 0
Design and Performance Evaluation of the MIMO SFBC CI-OFDM Communication System MIMO SFBC CI-OFDM通信系统的设计与性能评价
H. Ryu, Sang-Burm Ryu, Seon-Ae Kim
The CI-OFDM (carrier interferometry orthogonal frequency division multiplexing) CI-OFDM system spreads each information symbol across all N sub-carriers using orthogonal CI spreading codes. The CI-OFDM system can show the advantage of PAPR (peak to average power ratio) reduction and frequency diversity gains without any loss in the communication throughput. In this paper, focusing on the two Tx (transmit) / one Rx (receive) antennas and two Tx / two Rx antennas configuration in the MIMO (multiple input multiple output) antenna array systems, we like to design and evaluate the performance of this MIMO CI-OFDM system. SFBC (space frequency block coding) coding is used for the MIMO CI-OFDM system. For CI-OFDM realization, digital implemented CI-OFDM structure is used in which CI code spreading operation and carrier allocation are separately processed by simple IFFT type operation. From the simulation results, it is shown that MIMO SFBC CI-OFDM reduces PAPR significantly compared with the conventional MIMO SFBC-OFDM system. The out-of band re-growth of signal spectrum in MIMO SFBC CI-OFDM system is much smaller than MIMO SFBC OFDM. In the NBI (narrow band interference) channel MIMO SFBC CI-OFDM system achieves considerable BER improvement.
载波干涉正交频分复用(CI- ofdm)系统使用正交CI扩频码在所有N个子载波上传播每个信息符号。CI-OFDM系统可以在不损失通信吞吐量的情况下,显示出PAPR(峰值与平均功率比)降低和频率分集增益的优点。本文针对MIMO(多输入多输出)天线阵列系统中的两个Tx(发射)/一个Rx(接收)天线和两个Tx /两个Rx天线配置,设计并评估了该MIMO CI-OFDM系统的性能。MIMO CI-OFDM系统采用空间频率块编码(SFBC)编码。CI- ofdm的实现采用数字实现的CI- ofdm结构,通过简单的IFFT类型操作分别处理CI码扩展操作和载波分配。仿真结果表明,与传统MIMO SFBC- ofdm系统相比,MIMO SFBC CI-OFDM系统显著降低了PAPR。MIMO SFBC CI-OFDM系统中信号频谱的带外再增长比MIMO SFBC OFDM小得多。在NBI(窄带干扰)信道MIMO中,SFBC CI-OFDM系统实现了相当大的误码率改善。
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引用次数: 2
SC Diversity Receiver over Rician Correlated Fading: Average SIR and Average SEP 正交相关衰落下的SC分集接收机:平均SIR和平均SEP
M. Stefanovic, A. Panajotovic, D. Draca, I. Petrovic
Ascertaining the importance of the dual selection combining (SC) receiver and ability of Rician model to describe fading in wireless communications, we derive infinity-series representation for the probability density function (PDF) of output signal-to-interference ratio (SIR) at dual SC receiver over correlated Rician fading channels in the presence of correlated Rayleigh distributed cochannel interference (CCI). This expression is used to study important wireless system performance criteria, such as average output signal-to-interference ratio (ASIR) and average symbol error probability (ASEP) for several modulation schemes. Numerical results presented in this paper point out effects of correlation and fading severity on the system performance.
确定了双选择组合(SC)接收机在无线通信中的重要性和ricermodel描述衰落的能力,在相关瑞利分布共信道干扰(CCI)存在的情况下,导出了双选择组合接收机在相关ricer衰落信道上输出信噪比(SIR)的概率密度函数(PDF)的无穷级数表示。该表达式用于研究重要的无线系统性能标准,如几种调制方案的平均输出信干扰比(ASIR)和平均符号错误概率(ASEP)。数值结果表明了相关性和衰落严重程度对系统性能的影响。
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引用次数: 0
期刊
2008 The Fourth International Conference on Wireless and Mobile Communications
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