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2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications最新文献

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Multiuser Channel Estimation and Tracking for MC-CDMA Uplink Transmissions MC-CDMA上行传输的多用户信道估计与跟踪
L. Sanguinetti, M. Morelli
We discuss channel acquisition and tracking in the uplink of a multi-carrier code-division multiple-access (MC-CDMA) system. Channel acquisition is performed jointly with noise power estimation following two different approaches. The first assumes independently faded subcarriers while the second exploits the fading correlation across the signal bandwidth to improve the system performance. Both schemes are based on maximum likelihood (ML) reasoning and exploit some training blocks carrying known symbols. Channel tracking is pursued through least-mean square (LMS) techniques, using data decisions provided by a partial parallel interference cancellation (PPIC) receiver
讨论了多载波码分多址(MC-CDMA)系统上行链路中的信道获取和跟踪问题。采用两种不同的方法进行信道采集和噪声功率估计。前者假设独立衰落的子载波,而后者利用信号带宽上的衰落相关性来提高系统性能。这两种方案都基于最大似然(ML)推理,并利用一些携带已知符号的训练块。信道跟踪是通过最小均方(LMS)技术进行的,使用由部分并行干扰消除(PPIC)接收器提供的数据决策
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引用次数: 1
High quality audio services over a L-band satellite link using COFDM with soft-decision 高质量的音频服务在l波段卫星链路使用COFDM与软判决
P. Falconio, F. Catania, M. Amato, R. Cusani
The choose to perform a C-OFDM modulation directly by satellite makes the design of cost-effective new communication scenarios possible, in periods in which satellite communications call for a higher penetration in everyday services provision, avoiding the high costs of terrestrial-segment infrastructures to make the satellite signal exploitable by mobile users in urban environments. This paper focuses on the analysis of the performances of a C-OFDM-based communication scheme for the provision of a high quality and scalable bit rate radio signal over satellite links and exploitable in urban environments. Due to these preambles, the almost unemployed specifically satellite-oriented Mode-III of the DAB standard is considered, in conjunction with the design of an high-effective receiver based on soft-decision schemes, in cohabitation with almost very spread terrestrial DAB services. The degradations due to propagation and signal distortions introduced by the payload are also taken into account in the analysis of the transmission system
选择直接由卫星执行C-OFDM调制使得设计具有成本效益的新通信方案成为可能,在卫星通信要求在日常服务中提供更高的渗透率的时期,避免了地面段基础设施的高成本,使卫星信号在城市环境中被移动用户利用。本文重点分析了基于c - ofdm的通信方案的性能,该方案可在卫星链路上提供高质量和可扩展的比特率无线电信号,并可在城市环境中使用。由于这些序言,结合基于软决策方案的高效接收器的设计,与几乎非常广泛的地面DAB服务共存,考虑了几乎失业的特别是面向卫星的DAB标准的Mode-III。在对传输系统的分析中,还考虑了由有效载荷引起的传输衰减和信号失真
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引用次数: 0
Enhancing resilience for high availability IP-based signaling transport 增强高可用性基于ip的信令传输的弹性
R. Rembarz, S. Baucke, P. Mähönen
With network operators migrating from circuit-switched networks to IP networks, the need for a concept to provide operator grade trunk signaling over IP arises. A solution to enable signaling transport over IP is defined by the IETF SIGTRAN framework that allows for interworking with the Signaling System No. 7 (SS7). SIGTRAN is based on the stream control transmission protocol (SCTP) that also has a built-in redundancy mechanism, which allows switching to an alternative destination address (failover). Existing work showed that a failover performance comparable to SS7 can be achieved by aggressively setting the SCTP protocol parameters. However, this brings about possible stability issues because these parameter settings seriously impair the protocol mechanisms responsible for reacting to delay variations and congestion situations. We propose a set of network redundancy mechanisms that resolve most network failures transparently to SCTP. In order to eliminate possible stability issues, we use the default SCTP protocol parameters. Simulation results confirm that the proposed architecture can noticeably improve the robustness to concurrent network failures and achieve a similar delay behavior without jeopardizing the protocol stability
随着网络运营商从电路交换网络迁移到IP网络,需要在IP上提供运营商级中继信令的概念。IETF SIGTRAN框架定义了一个通过IP实现信令传输的解决方案,该解决方案允许与7号信令系统(SS7)进行交互。SIGTRAN基于流控制传输协议(SCTP),该协议还具有内置冗余机制,允许切换到另一个目标地址(故障转移)。现有的工作表明,通过积极设置SCTP协议参数,可以实现与SS7相当的故障转移性能。然而,这带来了可能的稳定性问题,因为这些参数设置严重损害了负责响应延迟变化和拥塞情况的协议机制。我们提出了一套网络冗余机制,可以对SCTP透明地解决大多数网络故障。为了消除可能的稳定性问题,我们使用默认的SCTP协议参数。仿真结果表明,该架构能够显著提高对并发网络故障的鲁棒性,并在不影响协议稳定性的情况下实现相似的延迟行为
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引用次数: 3
Indoor positioning using spatial power spectrum 利用空间功率谱进行室内定位
K. Sayrafian-Pour, D. Kaspar
A simple technique to estimate the position of a given mobile source inside a building is based on the received signal strength. For this methodology to have a reasonable accuracy, radio visibility of the mobile by at least three access points is required. To reduce the number of the required access points and therefore, simplify the underlying coverage design problem, we propose a new scheme that takes into account the distribution of RF energy around the receiver. In other words, we assume that the receiver is equipped with a circular antenna with beamforming capability. In this way, the spatial spectrum of the received power can be measured by rotating the antenna beam around the 360-degree field of view. This spatial spectrum can be used by a single receiver as a mean for estimating the position of a mobile transmitter. In this paper, we investigate the feasibility of this methodology, and show the improvement achieved in the positioning accuracy
估计建筑物内给定移动源位置的一种简单技术是基于接收到的信号强度。为了使这种方法具有合理的准确性,需要至少三个接入点对移动设备的无线电可见性。为了减少所需接入点的数量,从而简化潜在的覆盖设计问题,我们提出了一种考虑接收器周围射频能量分布的新方案。换句话说,我们假设接收机配备了具有波束形成能力的圆形天线。通过这种方式,可以通过旋转天线波束360度视场来测量接收功率的空间频谱。该空间频谱可被单个接收机用作估计移动发射机位置的平均值。在本文中,我们研究了该方法的可行性,并展示了定位精度的提高
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引用次数: 15
Performance analysis of micro mobile MPLS for future wireless networks 面向未来无线网络的微型移动MPLS性能分析
R. Langar, S. Tohmé, N. Bouabdallah, G. Pujolle
In this paper, we propose a practical approach to address how micro-mobility can be provided in an efficient way with continuous quality of service (QoS) support. Our proposal is based on multiprotocol label switching (MPLS) and mobile IP and relies on two-level hierarchy architecture. It supports two protocol variants. First, the fast handoff process, which anticipates the LSPs procedure setup with the neighboring locations where a mobile node (MN) may move to, is provided to reduce the service disruption. Second, a new mechanism based on the forwarding chain concept is proposed to track efficiently the host mobility within a domain. This concept can significantly reduce the registration updates cost and provide low handoff latency. Analytical models are developed and simulations are conducted to justify the benefits of our proposed mechanisms
在本文中,我们提出了一种实用的方法来解决如何以有效的方式提供持续服务质量(QoS)支持的微移动性。该方案基于多协议标签交换(MPLS)和移动IP,采用两级层次结构。它支持两种协议变体。首先,提供了快速切换过程,该过程预测了移动节点(MN)可能移动到的相邻位置的lsp过程设置,以减少服务中断。其次,提出了一种基于转发链概念的新机制来有效地跟踪域内主机的移动。这个概念可以显著降低注册更新成本并提供低切换延迟。开发了分析模型并进行了模拟,以证明我们提出的机制的好处
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引用次数: 5
Effective capacity of imperfect adaptive wireless communication systems 不完全自适应无线通信系统的有效容量
Ulrico Celentano, S. Glisic
This paper presents a model for the link service capacity that an imperfect adaptive radio link provides to upper layers. As the main contribution of this paper, the model includes a number of imperfections in the link adaptation chain, as well as implementation implications. The average goodput is expressed also in compact form and its dependence on the impairments is discussed using analytical, numerical, and simulations results. The model, to be used for analyses at upper layers, integrates physical channel, transceiver characteristics, and imperfections in a flexible way, by independent, separate matrices
本文提出了一个不完全自适应无线电链路提供给上层的链路服务容量模型。作为本文的主要贡献,该模型包含了链接适应链中的一些不完善之处,以及实施意义。平均收益也以紧凑形式表示,并使用解析、数值和模拟结果讨论了其与损失的依赖关系。该模型将用于上层分析,通过独立的单独矩阵以灵活的方式集成物理信道、收发器特性和缺陷
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引用次数: 4
Convexity Analysis of the Feasible MSE Region of Sum-Power Constrained Multiuser MIMO Systems 和功率约束多用户MIMO系统可行MSE域的凸性分析
Shuying Shi, M. Schubert
We study the geometry of the feasible MSE region of multiuser MIMO systems with fixed transmitters and receivers. The sum of all powers is assumed to be constrained. We consider both linear processing and non-linear processing, i.e., interference precompensation in the downlink and successive interference cancellation in the uplink. We show that, for both cases, the feasible MSE region of uplink and downlink is a convex set. In addition, we show for adaptive multiuser reception/preceding, that the maximal feasible MSE region for two-user beamforming systems with adaptive MMSE filtering are convex
研究了具有固定发射接收机的多用户MIMO系统的可行MSE域的几何形状。假定所有权力的总和是受限的。我们同时考虑了线性处理和非线性处理,即下行链路的干扰预补偿和上行链路的连续干扰消除。我们证明了在这两种情况下,上行链路和下行链路的可行MSE域都是凸集。此外,对于自适应多用户接收/前置,我们证明了自适应MMSE滤波的双用户波束形成系统的最大可行MSE区域是凸的
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引用次数: 7
Cluster Angular Spreads in a MIMO Indoor Propagation Environment MIMO室内传播环境下的簇角扩展
N. Czink, E. Bonek, X. Yin, B. Fleury
An important parameter of MIMO channel models is the cluster root-mean-square (rms) directional spread. In this paper we determine this parameter in the azimuth-of-arrival/azimuth-of-departure (AoA/AoD) domain based on comprehensive indoor MIMO measurements at 5.2 GHz in a cluttered office environment. This is done in a four-step procedure: (i) the SAGE algorithm is used to extract propagation paths, (ii) clusters of estimated paths in the double-azimuth domain are defined, (iii) the estimated propagation paths are allocated to the clusters, (iv) the cluster directional spreads are estimated based solely on propagation paths within the clusters. We found that the spreads are different when seen from transmitter or receiver due to different propagation conditions resulting in AoD rms cluster spreads lying in the range from 2 to 9 degrees and AoA rms cluster spreads in the range from 2 to 7 degrees
MIMO信道模型的一个重要参数是簇的均方根(rms)方向扩展。在本文中,我们在杂乱的办公环境中,基于5.2 GHz的综合室内MIMO测量,确定了到达/出发方位角(AoA/AoD)域的该参数。这是通过四个步骤完成的:(i)使用SAGE算法提取传播路径,(ii)定义双方位域中估计路径的集群,(iii)将估计的传播路径分配给集群,(iv)仅基于集群内的传播路径估计集群的方向扩展。我们发现,由于传播条件的不同,从发射端和接收端看到的扩散是不同的,导致AoD rms集群的扩散范围在2 ~ 9度之间,AoA rms集群的扩散范围在2 ~ 7度之间
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引用次数: 48
Integrated middleware framework for service mediation and value-added service provisioning in 3G/B3G networks 用于3G/B3G网络中服务中介和增值业务提供的集成中间件框架
D. Chakraborty, S. Jaiswal, A. A. Nanavati
The provisioning of value-added-services (VAS) to mobile users is crucial for the proliferation and early adoption of converged voice and data networks, 3rd generation/beyond 3rd generation networks (3G/B3G). In this paper, we describe a VAS provisioning middleware framework for deployment in 3G mobile operator networks. Through this framework, we enable on-demand selection of 3rd party services in 3G/B3G networks. The main contribution, in terms of novelty, is that the framework introduces a new service provisioning paradigm called on demand service selection. The service selection (a requested user task can be accomplished by many similar service offerings, therefore the need for selecting a particular service) is driven by the 3G operator business policies, user profile/preferences and runtime context information. Also, the framework adapts the service selection to changing business-technical performances of the 3rd party CP/SP, and specific user preferences and context
向移动用户提供增值服务(VAS)对于第三代/超越第三代网络(3G/B3G)融合语音和数据网络的扩散和早期采用至关重要。在本文中,我们描述了一个用于部署在3G移动运营商网络中的VAS供应中间件框架。通过这个框架,我们可以在3G/B3G网络中按需选择第三方服务。就新颖性而言,该框架的主要贡献是引入了一种新的服务供应范式,称为随需应变服务选择。服务选择(请求的用户任务可以通过许多类似的服务产品来完成,因此需要选择特定的服务)是由3G运营商业务策略、用户配置文件/首选项和运行时上下文信息驱动的。此外,该框架使服务选择适应第三方CP/SP不断变化的业务技术性能,以及特定的用户偏好和上下文
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引用次数: 1
On the implications of layered space-time multiuser detection on the design of MAC protocols for ad hoc networks 分层空时多用户检测对自组织网络MAC协议设计的影响
P. Casari, M. Levorato, M. Zorzi
In this paper, we shed some light on the implications that using a recently proposed layered space-time multiuser detection technique has on MAC protocol design for ad hoc networks with multiple antennas. From this point of view, our work relates to both physical layer and network layer studies. In fact, on the one hand physical layer aspects are important to characterize the behavior at the receiver, especially in terms of bit and packet error rates, but are rarely considered in conjunction with networking scenarios; on the other hand, networking aspects are typically studied using drastically simplified physical layer models that, while allowing easier networking analysis, are often too restrictive or unrealistic. Also, this disconnects between physical and networking layer studies may severely limit the possibilities for cross-layer optimization, which appears to be the right approach for efficient wireless network design. Our paper is then an effort to establish some connection between the "physical" and "network" approaches, highlighting some interesting capabilities that ad hoc networks with multiple antennas are endowed by the use of multiuser detection
在本文中,我们阐明了使用最近提出的分层时空多用户检测技术对具有多天线的自组织网络的MAC协议设计的影响。从这个角度来看,我们的工作涉及物理层和网络层的研究。事实上,一方面物理层方面对于描述接收方的行为很重要,特别是在比特和包错误率方面,但很少与网络场景结合考虑;另一方面,通常使用极其简化的物理层模型来研究网络方面,这些模型虽然允许更容易地进行网络分析,但通常过于严格或不切实际。此外,物理层和网络层研究之间的这种脱节可能严重限制跨层优化的可能性,而跨层优化似乎是高效无线网络设计的正确方法。然后,我们的论文将努力在“物理”和“网络”方法之间建立某种联系,强调使用多用户检测赋予具有多天线的自组织网络的一些有趣功能
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引用次数: 20
期刊
2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications
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