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2013 International Conference on Wireless Communications and Signal Processing最新文献

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Adaptive cell range control in heterogeneous network 异构网络中的自适应小区范围控制
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677262
Xinyu Gu, Wenyu Li, Lin Zhang
With Cell Range Extension in a heterogeneous network, the users in the range extension area usually suffer from high interference from macro cell. This may degrade the cell-edge user downlink performance if the resource provided in the Low Power Node can not compensate for the loss from the increased interference. This paper proposes an adaptive algorithm to dynamically adjust the coverage area of the Low Power Node. By using this algorithm, the coverage area of the Low Power Node is extended dynamically according to the varying traffic situation in the network so as to avoid any unnecessarily increased interference from range extension. Simulation results indicate that the proposed algorithm can ensure a nearly optimal cell-edge user performance in all tested traffic load situation.
在异构网络中进行小区范围扩展时,在小区范围扩展区的用户通常会受到较大的宏小区干扰。如果低功率节点中提供的资源不能补偿增加的干扰所造成的损失,则可能降低蜂窝边缘用户下行链路的性能。提出了一种动态调整低功耗节点覆盖面积的自适应算法。利用该算法,可以根据网络中不同的流量情况动态扩展低功率节点的覆盖区域,避免了范围扩展带来的不必要的干扰增加。仿真结果表明,在所有测试的流量负载情况下,该算法都能保证蜂窝边缘用户性能接近最优。
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引用次数: 9
Optimum weighted cumulation target detection for resonance region multi-carrier radar 共振区多载波雷达最优加权累积目标检测
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677052
Peng Chen, Lenan Wu
This paper presents an optimum weighted cumulation target detection (OWCTD) algorithm and prewhitening processing matrix for resonance region multi-carrier radar, and points out that the target detection performance of the wideband multi-carrier pulse radar using OWCTD algorithm is better than the traditional match filter algorithm. In addition, this paper deduces that the target velocity has little effect on the detection performance of the OWCTD algorithm. Finally, the asymptotic target detection probability as SNR tends to infinity is given, and the OWCTD algorithm performs better than the traditional match filter target detection algorithm at all target velocity.
提出了一种适用于共振区多载波雷达的最优加权累积目标检测(OWCTD)算法和预白化处理矩阵,指出采用OWCTD算法的宽带多载波脉冲雷达目标检测性能优于传统匹配滤波算法。此外,本文还推导出目标速度对OWCTD算法的检测性能影响不大。最后给出了信噪比趋于无穷大时的渐近目标检测概率,表明OWCTD算法在所有目标速度下都优于传统的匹配滤波目标检测算法。
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引用次数: 2
Joint optimization between MLB and MRO based on cell load balance for LTE networks 基于小区负载均衡的LTE网络MLB和MRO联合优化
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677152
Jun Zhou, Yijun Mo, Bang Wang
Mobility Load Balancing (MLB) and Mobility Robustness Optimization (MRO) are two important functions in Long Term Evolved (LTE) cellular mobile networks. They are closely related because they both adjust handover parameters to achieve their respective objective. But some conflicts may occur if both of the two functions work inconsistently and adjust the same parameter in opposite directions. This will result in huge resource waste, and both of them will not work efficiently. In this paper, we present a scheme embedded in MLB based on the cell load to solve the conflict problem. Analysis and simulation results show that the proposed scheme works efficiently and improves the performance of the network.
移动负载均衡(MLB)和移动鲁棒性优化(MRO)是长期演进(LTE)蜂窝移动网络中的两个重要功能。它们是密切相关的,因为它们都通过调整切换参数来实现各自的目标。但是,如果两个函数的工作不一致,并且将同一参数调整到相反的方向,则可能会发生冲突。这将造成巨大的资源浪费,两者都无法有效地工作。在本文中,我们提出了一种基于单元负载的嵌入MLB的方案来解决冲突问题。分析和仿真结果表明,该方案有效地提高了网络的性能。
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引用次数: 1
Improved multi-hop time synchronization for Underwater Acoustic Networks 改进的水声网络多跳时间同步
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677184
Jianxiong Wen, Lianghui Ding, Feng Yang, Liang Qian, Chuan Sun
Time synchronization is important for many distributed applications in Underwater Acoustic Networks (UANs) with large propagation delay, such as precise scheduling, target tracking and energy conservation. In this paper, we prove that the accuracy of time skew estimation increases as the number of overheard packet exchange from other neighboring nodes increases, and propose a light-weighted synchronization algorithm for multi-hop UANS, named as Improved Multi-hop time Synchronization for Underwater Acoustic Networks(IMSUAN). IMSUAN consists of three parts. The first one is to establish a time synchronization tree with the reference node as the root, and assign each node a tree level as low as possible. The second one is to synchronize with the parent node by dedicated three-time handshake and overhear exchange packets from parent and neighboring nodes. The third is to filter the inaccurate time-stamps of the overheard synchronization packets. In the paper, we establish a simulation platform in OPNET to evaluate the performance of IMSUAN. Simulation results show that the performance of extended Tri-message, MSUAN and IMSUAN are the same when no overhearing exists. However, when overhearing is possible in a random topology, the performance of IMSUAN can be 60% better than extended Tri-Message and 40% better than MSUAN.
在具有大传播时延的水声网络中,时间同步对于精确调度、目标跟踪和节能等分布式应用具有重要意义。在本文中,我们证明了时间偏差估计的准确性随着来自其他相邻节点的窃听包交换数量的增加而增加,并提出了一种用于多跳UANS的轻量级同步算法,称为改进的水声网络多跳时间同步(IMSUAN)。IMSUAN由三部分组成。第一种是建立以参考节点为根的时间同步树,并为每个节点分配尽可能低的树级。第二种是通过专门的三次握手与父节点同步,并监听来自父节点和相邻节点的交换数据包。三是对窃听到的同步报文的不准确时间戳进行过滤。在本文中,我们在OPNET中建立了一个仿真平台来评估IMSUAN的性能。仿真结果表明,在无监听情况下,扩展三报文、MSUAN和IMSUAN的性能是相同的。然而,当在随机拓扑中可能偷听时,IMSUAN的性能可以比扩展Tri-Message好60%,比MSUAN好40%。
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引用次数: 1
Data aggregation using RSSI for multihop Wireless Sensor Networks RSSI在多跳无线传感器网络中的数据聚合
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677041
A. Awang, Shobhit Agarwal
In Wireless Sensor Networks (WSNs), sensor nodes are often deployed in large quantity and high density. Due to dense deployment, the sensed data are often redundant and highly correlated. Transmitting redundant data is not practical in the resource-constrained WSNs particularly from the viewpoint of energy conservation. Data aggregation offers a key solution to curtail the network loads and hence reduces the transmission energy consumption. In this work, we propose two data aggregation mechanisms (class-based and alpha-based) that aggregate and route data packet based on Received Signal Strength Indicator (RSSI). Each node maintains an RSSI value with respect to a sink node. When a data packet is generated, an aggregation identification (Agg ID) is associated with that packet. Using the RSSI and Agg ID in RSSI-Based Forwarding (RBF), we favor nodes closer to sink when aggregating and relaying a data packet. We show via simulation the performance of the proposed mechanisms in terms of normalized number of transmissions, energy consumed per data packet, network lifetime and packet loss probability.
在无线传感器网络(WSNs)中,传感器节点通常是大量高密度部署的。由于部署密集,感测数据往往是冗余且高度相关的。在资源受限的无线传感器网络中传输冗余数据是不现实的,特别是从节能的角度来看。数据聚合是减少网络负载从而降低传输能耗的关键解决方案。在这项工作中,我们提出了两种数据聚合机制(基于类和基于α),它们基于接收信号强度指示器(RSSI)聚合和路由数据包。每个节点维护一个相对于汇聚节点的RSSI值。当生成数据包时,聚合标识(Agg ID)与该数据包相关联。在基于RSSI的转发(RBF)中使用RSSI和Agg ID,当聚合和转发数据包时,我们倾向于靠近sink的节点。我们通过仿真展示了所提出的机制在标准化传输数、每个数据包消耗的能量、网络寿命和丢包概率方面的性能。
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引用次数: 0
Optimal power allocation scheme for the two-way relay channel using ANC in cognitive radio 认知无线电中基于ANC的双向中继信道最优功率分配方案
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677206
Mi Hu, J. Ge, Xiaoye Shi
In this paper, we study the optimal power allocation (OPA) for the two-way relay channel employing the analogue network coding (ANC) protocol in cognitive radio (CR) network. The OPA scheme is proposed by minimizing the weaker link's individual outage probability under the sum-power constraint and interference power threshold (IPT) constraints to the primary user (PU) in a Rayleigh fading channel environment. Particularly, for the purpose of accomplishing the power allocation more realistically, the interference to each other between PU and secondary user (SU) and relay is taken into consideration. And the closed-form solution for the optimum power allocation scheme of each case is derived. Numerical Results confirm that the system with the proposed scheme for the two-way relaying with ANC has a gain of 3dB over the equal power allocation (EPA) scheme no matter with or without IPT. When introduced IPT constraints into the optimization scheme, the outage probability of SU communication cannot be reduced after a certain level of total power, even though the total power is sufficient. Meanwhile, the best location for the relay is near by the middle point of the two end nodes regardless of the power allocation scheme.
本文研究了认知无线电(CR)网络中采用模拟网络编码(ANC)协议的双向中继信道的最优功率分配(OPA)。在瑞利衰落信道环境下,在对主用户(PU)的和功率约束和干扰功率阈值(IPT)约束下,最小化较弱链路的单个中断概率,提出了OPA方案。特别是,为了更真实地完成功率分配,考虑了PU与辅助用户(SU)和中继之间的相互干扰。并推导了每种情况下的最优功率分配方案的封闭解。数值结果表明,无论是否使用IPT,采用该方案的双向中继系统都比采用等功率分配(EPA)方案的系统增益高3dB。当优化方案中引入IPT约束时,即使总功率足够,在总功率达到一定水平后,SU通信的中断概率也不能降低。同时,无论何种功率分配方案,继电器的最佳位置都是靠近两端节点的中间点。
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引用次数: 4
Relay selection scheme based on propagation delay for cooperative underwater acoustic network 基于传播延迟的协同水声网络中继选择方案
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677110
Chao Gao, Zhiyong Liu, Bin Cao, Liwei Mu
In recent research of wireless communication, the concept of cooperative diversity has been put forward and used widely. A number of transmission schemes designed for radio communications could not be directly applied to underwater network, where channel characteristics are more complicated. In this paper, we consider a situation comparatively closer to the realistic underwater acoustic communication and investigate the relay selection problem. Considering the long propagation delay caused by low speed of sound, we design a cooperative transmission scheme. In this scheme, the network chooses the optimal relay or the suitable number of nodes adapting to the changes of underwater circumstances. Then the signal-to-noise ratio (SNR) is added to the criterion of relay selection to realize a more effective algorithm.
在最近的无线通信研究中,合作分集的概念被提出并得到了广泛的应用。许多专为无线电通信设计的传输方案不能直接应用于信道特性更为复杂的水下网络。本文考虑了一种比较接近实际水声通信的情况,研究了中继选择问题。考虑到低声速造成的传播延迟较长,设计了一种协同传输方案。在该方案中,网络根据水下环境的变化选择最优中继或适当的节点数。然后将信噪比(SNR)加入到继电器选择准则中,实现更有效的算法。
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引用次数: 22
A CSMA/TDMA dynamic splitting scheme for MAC protocol in VANETs 一种用于VANETs中MAC协议的CSMA/TDMA动态拆分方案
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677115
Lijuan Cao, Wenjun Xu, Xuehong Lin, Jiaru Lin
The MAC protocol can minimize simultaneous channel access attempts in an effort to decrease the interference and thereby increases reliability, which is vitally important for VANETs (vehicle ad hoc networks). In this paper, an adaptive hybrid MAC (Medium Access Control) scheme is proposed for VANETs, in which the transmission frame is split dynamically into two parts according to the traffic load. In the first part, CSMA/CA (Carrier Sense Multiple Access method with Collision Avoidance) is adopted as the access technology, and in the second one, STDMA (Self-organizing Time Division Multiple Access) is exploited. We implement simulations with various traffic loads in the MATLAB platform, and the simulation results show that the proposed scheme is reliable and can achieve better performance in channel access delay and packet drop probability than both pure CSMA/CA and STDMA schemes.
MAC协议可以最大限度地减少同时通道访问尝试,以减少干扰,从而提高可靠性,这对vanet(车辆自组织网络)至关重要。本文提出了一种针对vanet的自适应混合介质访问控制(MAC)方案,该方案将传输帧根据业务负载动态拆分为两部分。第一部分采用CSMA/CA (Carrier Sense Multiple Access method with Collision Avoidance)作为接入技术,第二部分采用自组织时分多址(STDMA)技术。仿真结果表明,该方案可靠,在信道接入时延和丢包概率方面均优于纯CSMA/CA和STDMA方案。
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引用次数: 7
Delay correlation based differential space-time modulation for high speed train transmission 基于延迟相关的高速列车传输差分时空调制
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677284
Chunxu Jiao, Zhaoyang Zhang, Jun Yu Li
In this paper, a differential space-time modulation (DSTM) scheme is put forward for high speed train(HST) transmission system. In particular, the HST is equipped with multiple antennas. By exploiting the delay correlation inherited from the linear mobility of HST, this scheme performs extremely robustly and efficiently even without knowing CSI at the transmitter or receiver. The performance of an optimal unitary code in a specific 2 × 2 case is studied and the accurate analytical expression for its pairwise error probability(PEP) is obtained. Furthermore, a rather tight upper bound for the symbol error rate(SER) based on PEP is derived. Simulation results verify the good performance of the proposed scheme.
提出了一种适用于高速列车(HST)传输系统的差分时空调制(DSTM)方案。特别是,HST配备了多个天线。该方案利用了HST线性迁移率所继承的延迟相关特性,在不知道发送端或接收端CSI的情况下,也能实现鲁棒性和高效性。研究了特定2 × 2情况下最优酉码的性能,得到了其成对误差概率(PEP)的精确解析表达式。在此基础上,推导了基于PEP的符号错误率(SER)的一个较为严格的上界。仿真结果验证了该方案的良好性能。
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引用次数: 0
Multicast/broadcast service in integrated VANET-cellular heterogeneous wireless networks 集成vanet -蜂窝异构无线网络中的多播/广播业务
Pub Date : 2013-12-02 DOI: 10.1109/WCSP.2013.6677246
Wei Zhou, C. Ren, Chuan Ma, Hui Yu, Han-wen Luo, Xiaoying Gan, Wang Xi
In recent years, there is a significant trend for VANET to provide not only traditional services like warning information exchanging for road safety and car collision avoidance but also various multimedia applications such as mobile TV which may require broadband access to core network or Internet. On the other hand, service provision technologies with point-to-multipoint transmission mode which could better utilize the limited wireless resource have been well discussed and standardized, such as MBMS in 3GPP and BCMCS in 3GPP2. In this paper, we propose an effective solution aimed to enable multicast/broadcast service provision in integrated VANET-cellular heterogeneous wireless networks based on a two-phase cooperative transmission strategy. Through analysis and simulation, our proposal combines advantages of these two heterogeneous networks and the nature of multicast/broadcast technology.
近年来,VANET在提供道路安全警示信息交换、汽车防撞等传统服务的同时,也有一个显著的发展趋势,即提供各种多媒体应用,如移动电视,这些应用可能需要宽带接入核心网或互联网。另一方面,能够更好地利用有限无线资源的点对多点传输模式的业务提供技术也得到了很好的讨论和规范,如3GPP中的MBMS和3GPP2中的BCMCS。在本文中,我们提出了一种有效的解决方案,旨在实现集成vanet -蜂窝异构无线网络中基于两阶段协作传输策略的多播/广播业务提供。通过分析和仿真,我们的方案结合了这两种异构网络的优点和组播/广播技术的特性。
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引用次数: 4
期刊
2013 International Conference on Wireless Communications and Signal Processing
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