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2006 IFIP International Conference on Wireless and Optical Communications Networks最新文献

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Dedicated short range communications (DSRC) for intelligent transport system 智能交通系统专用短程通信(DSRC)
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666607
R. Bera, J. Bera, S. Sil, S. Dogra, N. B. Sinha, D. Mondal
In an effort to develop a complete DSRC system for ITS application, the authors have studied a lot of experimental facts which they are exploiting for the design. The wireless technology has been chosen properly which is capable of tackling the severe interferences present in the open road. For road to car communication, a combined digital technology like spread spectrum along with diversity reception will help a lot in this regard. Accordingly, the choice is for FHSS based space diversity system which will utilize carrier frequency around 5.8 GHz ISM band with available bandwidth of 80 MHz and no license. For efficient design, the radio channel is characterized on which the design is based. To have the full DSRC system, a fixed wireless connectivity at Ku band is also explored for road side base station to master switching center connectivity
为了开发一个完整的用于ITS应用的DSRC系统,作者研究了大量的实验事实,并为设计提供了借鉴。无线技术的选择是正确的,它能够解决开放道路中存在的严重干扰。对于道路到汽车的通信,扩频和分集接收等数字技术的结合将在这方面有很大帮助。因此,选择基于FHSS的空间分集系统,该系统将利用5.8 GHz ISM频段左右的载波频率,可用带宽为80 MHz,无需许可证。为了有效的设计,无线电信道是设计所基于的特征。为了拥有完整的DSRC系统,还探索了Ku频段的固定无线连接,用于路边基站与主交换中心的连接
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引用次数: 21
Comparative study between multi level modulations in chaotic optical communications 混沌光通信中多电平调制的比较研究
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666668
R.R.C. Reddy, T. Srinivas, A. Nadarajan
Performances of spectrally efficient multi level modulation schemes in chaotic optical communication systems are demonstrated numerically. In this paper we report usage of multi level modulation schemes in the form of QDPASK (quadrature differential phase amplitude shift keying) and IHAP (independent hybrid amplitude/phase modulation). Return to zero (RZ) pulse profiled QDPASK signal is added to the chaotic waveform and successfully retrieved. IHAP modulation of chaos is carried out and successful recovery of data is shown along with comparison with RZ-QDPASK. Successful recovery of message encoded in both schemes is shown heralding in improvement of bit rate 3 times than the ordinary chaotic optical communication system with only amplitude encoding
用数值方法证明了频谱高效的多电平调制方案在混沌光通信系统中的性能。在本文中,我们报告了QDPASK(正交差相移幅键控)和IHAP(独立混合振幅/相位调制)形式的多电平调制方案的使用。归零(RZ)脉冲型QDPASK信号被添加到混沌波形并成功检索。对混沌进行了IHAP调制,并与RZ-QDPASK进行了比较,显示了数据的成功恢复。两种方案编码后的信息都能成功恢复,比特率比仅采用幅度编码的普通混沌光通信系统提高了3倍
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引用次数: 4
Data profit based cache replacement in mobile environment 移动环境下基于数据利润的缓存替换
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666605
N. Chand, R. Joshi, M. Misra
Caching is a promising technique in mobile computing environment for improving the data retrieval performance. Due to cache size limitations, cache replacement algorithms are used to find a suitable subset of items for eviction from the cache. Cached items in a client are related to each other and therefore replacement of a data item which is highly associated may lead to series of misses during client's subsequent requests. The existing policies for cache replacement in mobile environment do not consider relationship among data items along with caching parameters. This paper proposes a novel cache replacement policy, R-LPV that considers the caching parameters of a data item along with the relationship of this item with the cache set. The simulation experiments show that, the R-LPV policy substantially outperforms other policies
在移动计算环境中,缓存是一种很有前途的提高数据检索性能的技术。由于缓存大小的限制,缓存替换算法用于找到合适的项子集,以便从缓存中删除。客户端的缓存项是相互关联的,因此替换高度关联的数据项可能会在客户端的后续请求期间导致一系列失败。现有的移动环境下的缓存替换策略没有考虑数据项之间的关系以及缓存参数。本文提出了一种新的缓存替换策略R-LPV,该策略考虑了数据项的缓存参数以及该数据项与缓存集的关系。仿真实验表明,R-LPV策略显著优于其他策略
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引用次数: 3
An efficient extension to chain codes for external image representation 一个有效的扩展链码的外部图像表示
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666674
K. Nallaperumal, J. Varghese, S. Saudia, J. J. Ranjani, K. Velu, S. Kannan
A novel contour representation algorithm for binary images which is an extension of the conventional chain code is proposed in this paper. The algorithm exploits the features of the conventional chain code when advantageous, is precise and simple with lesser computational complexity than most of the other standard shape representation algorithms. It uses very low bit-rate compared to the conventional chain code and is more robust to noise. The corresponding reconstruction algorithm is completely reversible to give the lossless reconstruction of the contour. Experimental results on various binary images add to the improved efficiency claim of the proposed contour representation algorithm in terms of visual fidelity and bit-rate
本文提出了一种新的二值图像轮廓表示算法,它是传统链码的扩展。该算法充分利用了传统链码的优点,与大多数其他标准形状表示算法相比,具有精确、简单、计算量小的优点。与传统的链码相比,它使用非常低的比特率,并且对噪声具有更强的鲁棒性。相应的重构算法是完全可逆的,可以给出轮廓的无损重构。在各种二值图像上的实验结果证实了所提出的轮廓表示算法在视觉保真度和比特率方面的有效性
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引用次数: 4
A Markov based method for modulation and coding scheme (MCS) with hybrid ARQ retransmission 一种基于马尔可夫的混合ARQ重传调制编码方案(MCS)方法
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666580
Fan Chen, Sui Lijun, Chen Mei-ya, Y. Dacheng
A Markov based method for modulation and coding scheme (MCS) selection is proposed for pilot assistant adaptive modulation and coding scheme (AMC) with hybrid ARQ (HARQ) retransmissions. A first-order finite-state Markov model (FSMM) is introduced to represent the time correlation character of channel fading during (channel quality indicator) CQI feedback and HARQ retransmissions. According to different QoS targets, such as maximizing the air interface throughput or maintaining a target frame error rate (FER) for each user, the Markov based method can deduce different reference pilot thresholds for each MCS. Theoretical analysis and link level simulation results both show the efficiency of the Markov based method for pilot threshold calculation according to different QoS target and different HARQ retransmission times
针对混合ARQ (HARQ)重传的导频辅助自适应调制编码方案(AMC),提出了一种基于马尔科夫的调制编码方案(MCS)选择方法。引入一阶有限状态马尔可夫模型(FSMM)来表征CQI反馈和HARQ重传过程中信道衰落的时间相关特性。根据不同的QoS目标,如最大化空中接口吞吐量或保持每个用户的目标帧错误率(FER),基于马尔可夫方法可以为每个MCS推导不同的参考导频阈值。理论分析和链路级仿真结果均表明,根据不同的QoS目标和不同的HARQ重传次数,基于马尔可夫的导频阈值计算方法是有效的
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引用次数: 7
A multipath transmission diversity scheme using prediction-based transmitter filter in FDD-CDMA systems FDD-CDMA系统中基于预测的发射机滤波器的多径传输分集方案
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666606
K. Rama Naidu, R. R. Raja Kumar, T. S. Lamba
A multipath transmission diversity scheme using predictive transmitter filter in the frequency division duplex-code division multiple access systems (FDD-CDMA) is introduced over a multipath fading channel. A transmitter filter is added in the transmitter, while a Rake combiner is used in the receiver. To design the transmitter filter at the base station for the current slot, we utilize the downlink channel impulse response (CIR) of the previous slots. It is assumed that the downlink CIR is transmitted from the mobile terminal to the base station. In addition, to compensate inherent feedback delays occurring during the transmission of channel information from mobile terminal to the base station, the channel prediction is utilized. Results show that the new scheme can significantly improve the output signal to noise ratio (SNR) compared with conventional Rake receiver
在频分双码分多址系统(FDD-CDMA)中,提出了一种基于预测发射机滤波器的多径传输分集方案。在发射机中增加一个发射机滤波器,而在接收机中使用Rake合成器。为了设计当前时隙的发射机滤波器,我们利用了以前时隙的下行信道脉冲响应(CIR)。假设下行链路CIR从移动终端传输到基站。此外,为了补偿信道信息从移动终端向基站传输过程中出现的固有反馈延迟,利用了信道预测。结果表明,与传统Rake接收机相比,新方案能显著提高输出信噪比
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引用次数: 1
Performance evaluation of end-to-end delay by hybrid scheduling algorithm for QoS in IEEE 802.16 network 基于ieee802.16网络QoS混合调度算法的端到端时延性能评价
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666587
K. Vinay, N. Sreenivasulu, D. Jayaram, D. Das
IEEE 802.16 standard supports real time and non-real time services at each node. However, it has flexibility to develop customized scheduling algorithms according to different priority-based traffic's quality of service (QoS) requirements. Hence, it is imperative to obtain optimum scheduling schemes for different kinds of traffic (i.e., services). Earliest due date (EDD) is one of the highly referred scheduling algorithms for real time communication. In this presentation, our study shows that the proposed hybrid algorithms (EDD along with weighted fair queue (WFQ)) in a node gives better performance for real time services instead of EDD only. Moreover, the results reveal that, scheduling schemes from base station (BS) to subscriber station (SS) like grant per SS (GPSS) impacts less delay than grant per connection (GPC)
IEEE 802.16标准支持每个节点的实时和非实时业务。但是,它可以灵活地根据不同优先级流量的QoS (quality of service)需求开发自定义调度算法。因此,针对不同类型的流量(即服务)获得最优调度方案势在必行。最早到期日调度算法(EDD)是一种被高度引用的实时通信调度算法。在本报告中,我们的研究表明,在节点中提出的混合算法(EDD和加权公平队列(WFQ))比仅EDD提供更好的实时服务性能。此外,结果表明,从基站(BS)到用户站(SS)的调度方案,如每SS授予(GPSS)对延迟的影响小于每连接授予(GPC)。
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引用次数: 81
Scenario based performance analysis of different gateway discovery mechanisms in integrated ad hoc networks and Internet 集成自组网和Internet中不同网关发现机制的基于场景的性能分析
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666625
T. Basavaraju, S. Sarkar, C. Puttamadappa
The integration of Internet and ad hoc mobile network exhibit differences in their network architecture. Thus, the interconnection is achieved by using Internet gateways, which acts as bridges between MANET and Internet. When a node in ad hoc network wants to access Internet, it has to first find route to a gateway. Therefore an efficient gateway discovery approach or mechanism is required. In this paper, the MANET routing protocol ad hoc on demand vector (AODV) is extended to support hybrid network. The three approaches for discovering gateways such as reactive, proactive and hybrid are compared and studied in different scenarios. We show that proactive and reactive performs better in different simulation environment
互联网与自组织移动网络的融合在网络架构上存在差异。因此,互连是通过使用互联网网关来实现的,网关充当MANET和互联网之间的桥梁。当自组织网络中的节点想要访问Internet时,它必须首先找到到网关的路由。因此,需要一种有效的网关发现方法或机制。本文对MANET路由协议AODV (ad hoc on demand vector)进行了扩展,以支持混合网络。在不同的场景下,对被动、主动和混合三种网关发现方法进行了比较和研究。结果表明,在不同的仿真环境下,主动响应和被动响应具有更好的性能
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引用次数: 6
Comparing adaptive-power and adaptive-rate MACs for wireless ad-hoc networks 比较无线自组织网络的自适应功率和自适应速率mac
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666561
S. Bassam, M.E.K. Khaandani
There are two approaches in designing MAC protocols: adaptive-power and adaptive-rate MACs. In adaptive-power MACs transmission power is changed upon nodes' distance in order to reduce energy consumption. In adaptive-rate MACs transmission rate is changed in order to improve throughput. Recent adaptive-power protocols suggest varying the transmission power such that the RTS/CTS handshake is done at the maximum and the data-ACK are transmitted at the minimum necessary transmission power level. It has also been suggested to periodically use maximum transmission power during data transmission (PCM MAC). In this paper we show that although adaptive-rate MACs are designed to increase throughput but they are also more power-efficient than adaptive-power MACs with maximum RTS-CTS power
设计MAC协议有两种方法:自适应功率MAC和自适应速率MAC。在自适应功率mac中,传输功率随节点距离的变化而变化,以降低能耗。在自适应速率mac中,通过改变传输速率来提高吞吐量。最近的自适应功率协议建议改变传输功率,使RTS/CTS握手以最大功率完成,而数据- ack以最小必要的传输功率级别传输。还建议在数据传输过程中定期使用最大传输功率(PCM MAC)。在本文中,我们表明,尽管自适应速率mac被设计为提高吞吐量,但它们也比具有最大RTS-CTS功率的自适应功率mac更节能
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引用次数: 3
A new approach to multicasting and QoS within an MPLS backbone 在MPLS主干网中实现多播和QoS的新方法
Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666656
J.S. Pedersen, N. Chilamkurti
Multicasting techniques can be applied to facilitate applications such as video conference-calls and multimedia distribution. Multicasting enhances network utilization by containing traffic to network segments that are part of the multicast tree only. This prevents network segments that are not part of the multicast tree to be flooded with unwanted traffic. In addition, multicasting prevents redundancy by copying packets destined for multiple downstream receivers at branching routers. Reservation protocol (RSVP) guarantees QoS for real-time applications and has the ability to achieve fairness across applications. An extension to RSVP called RSVP-traffic engineering (RSVP-TE) is proposed, which enables RSVP PATH and RESV messages to setup traffic engineered label switched paths (LSP). By adding multicast operations to RSVP-TE, point to multi-point LSPs can be created and this effectively enables multicasting within the MPLS domain. In this paper we present multicasting and QoS within a MPLS backbone (MQM) and an extension to the network simulator (NS-2), that shows the advantages of combining multicasting and RSVP-TE within an MPLS domain
多播技术可用于促进视频电话会议和多媒体分发等应用。组播通过只包含作为组播树一部分的网段的流量来提高网络利用率。这可以防止不属于组播树的网段被不需要的流量淹没。此外,组播通过在分支路由器上复制目的地为多个下游接收器的数据包来防止冗余。预留协议(RSVP)保证了实时应用程序的QoS,具有实现应用程序间公平性的能力。RSVP (RSVP- traffic engineering)是RSVP的一个扩展,它允许RSVP PATH和RESV消息建立流量工程标签交换路径LSP (traffic engineered label switched paths)。通过在RSVP-TE中添加组播操作,可以创建点到多点的lsp,从而有效地实现MPLS域内的组播。在本文中,我们提出了MPLS骨干网(MQM)中的多播和QoS,并对网络模拟器(NS-2)进行了扩展,显示了在MPLS域中将多播和RSVP-TE相结合的优点
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引用次数: 0
期刊
2006 IFIP International Conference on Wireless and Optical Communications Networks
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