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2011 Global Mobile Congress最新文献

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Design of microwave single balanced up-converter 微波单平衡上变频器的设计
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103915
Minglei Shen
This paper introduces a design method of K Band up-converter in microwave transmitter module. Coupling loop single balanced structure is applied in the up-converter. This up-converter has simple structure and good performance, which conversion loss is less than 8dB and the isolation of signal to LO is more than 30dB.
介绍了微波发射机模块中K波段上变频器的设计方法。上变频器采用耦合环单平衡结构。该上变频器结构简单,性能良好,转换损耗小于8dB,信号对本端隔离度大于30dB。
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引用次数: 0
Design of RC-LDPC codes and its application in codes SC-FDE systems RC-LDPC码的设计及其在SC-FDE系统中的应用
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103913
Jianwu Zhang, Huan Yan, J. Bao
This paper proposes a new scheme of the rate compatible low-density parity-check (RC-LDPC) coded single carrier-frequency domain equalization (SC-FDE) system where RC-LDPC codes are combined with SC-FDE modulations. To construct a class of different RC-LDPC codes, we take advantage of a base matrix constructed by the progressive edge growth (PEG) algorithm. A special code matrix structure is used and modified to meet requirements of the different code rate. In addition, a pseudorandom sequence instead of traditional cyclic prefix (CP) is proposed to estimate the channel noise variance for LDPC decoding. The simulation results show that the modified RC-LDPC codes have better performance than that of current method and the RC-LDPC coded SC-FDE system obtains better performance compared with uncoded SC-FDE system.
本文提出了一种将RC-LDPC码与SC-FDE调制相结合的速率兼容低密度奇偶校验编码单载波频域均衡(SC-FDE)系统的新方案。为了构造一类不同的RC-LDPC码,我们利用由渐进边缘增长(PEG)算法构造的基矩阵。采用了一种特殊的码矩阵结构,并对其进行了修改,以满足不同码率的要求。此外,提出用伪随机序列代替传统的循环前缀估计LDPC译码的信道噪声方差。仿真结果表明,改进的RC-LDPC编码比现有方法具有更好的性能,RC-LDPC编码的SC-FDE系统比未编码的SC-FDE系统具有更好的性能。
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引用次数: 0
A compact frequency reconfigurable antenna applied to WLAN/WiMAX 一种适用于WLAN/WiMAX的紧凑频率可重构天线
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103923
Xingjia Zhang, Dongya Shen, Lan Li, Hui-yuan Liu
A frequency reconfigurable antenna for WLAN/WiMAX applications is proposed. Frequency reconfigurable can be achieved by the transform of two PIN diodes switch on the ground slot. The proposed frequency reconfigurable antenna operates in WLAN 2.4 GHz band (2400–2484MHz) and WIMAX 2.5 GHz (2500–2690MHz). When both diodes were disconnected, and operates in WLAN 5.2 GHz (5150–5350MHz) and WIMAX 3.5GHz (3400–3690 MHz)/ 5.5 GHz (5250–5850 MHz) when both diodes were closed. PIN switches on or off can affect antenna's feeding structure, which can solve matching problem caused by change of antenna radiation body structure. In this way, the proposed antenna has good reconfigurable characteristic and high radiation gain.
提出了一种用于WLAN/WiMAX应用的频率可重构天线。通过在地槽上开关两个PIN二极管的变换,可以实现频率的可重构。提出的频率可重构天线工作在WLAN 2.4 GHz频段(2400-2484MHz)和WIMAX 2.5 GHz频段(2500-2690MHz)。当两个二极管断开时,当两个二极管关闭时,在WLAN 5.2 GHz (5150 - 550mhz)和WIMAX 3.5GHz (3400-3690 MHz)/ 5.5 GHz (5250-5850 MHz)下工作。PIN开关的开启或关闭可以影响天线馈电结构,解决了天线辐射体结构变化带来的匹配问题。因此,该天线具有良好的可重构特性和较高的辐射增益。
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引用次数: 5
Spectrum handoff decision algorithm with dynamic weights in cognitive radio networks 认知无线电网络中动态权值的频谱切换决策算法
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103935
Xianzhong Xie, Guang Yang, Bin Ma
While primary users (PU) arrive in cognitive radio networks, the current spectrum handoff scheme is that secondary users (SU) have to vacate the spectrum bands which is used and move to other available spectrum bands. This brings frequent spectrum handoffs and degrades the performance of SU even results in service interrupt. Actually SU can still continue to transmit (Underlay) as long as the interference at PU does not exceed a certain threshold. However, the coverage of Underlay is restricted. To overcome aforementioned problem, it is proposed a multi-cell spectrum handoff scheme as a supplement on the coverage of Underlay. Simple additive weights decision algorithm with dynamic weights (SAW-DW) in spectrum handoff is used to select optimal target cell for SU to avoid service interrupt when SU exceeds Underlay constraint. Theoretical analysis and simulation results show that the scheme and algorithm can reduce the probability of handoff failure and service interrupt of SU and improve quality of service.
当主用户(PU)到达认知无线网络时,当前的频谱切换方案是辅助用户(SU)必须腾出正在使用的频谱带,并移动到其他可用的频谱带。这带来了频繁的频谱切换,降低了SU的性能,甚至导致业务中断。实际上,只要PU处的干扰不超过一定的阈值,SU仍然可以继续传输(Underlay)。然而,Underlay的覆盖范围是有限的。为了克服上述问题,提出了一种多小区频谱切换方案,作为对Underlay覆盖范围的补充。采用频谱切换中动态加权的简单加性加权决策算法(SAW-DW)选择SU的最优目标小区,避免SU超过底层约束时业务中断。理论分析和仿真结果表明,该方案和算法能够降低SU切换失败和业务中断的概率,提高服务质量。
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引用次数: 17
Synchronization algorithm of an OFDM-based IEEE802.11a transmission system 基于ofdm的IEEE802.11a传输系统的同步算法
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103926
Kuixi Chen, Jihua Lu, Wanying Xia, Ji'ao Zhang, Shanshi Huang, Yixin Ma
IEEE802.11a standard has received considerable attention for adopting multi-carrier modulation called OFDM to improve the performance of data transmission and the effect of resisting multipath expansion. We build an OFDM-based IEEE802.11a platform and do some research on the Symbol synchronization in matlab, which using the cyclic preamble information to synchronize. Two synchronization algorithms are performed, which are maximum correlation and minimum mean-squared error (MMSE) method. Moreover, we conduct some simulations and compare the performance of the two algorithms, and then draw the conclusions.
IEEE802.11a标准由于采用OFDM多载波调制,提高数据传输性能和抗多径扩展的效果而受到广泛关注。本文搭建了一个基于ofdm的IEEE802.11a平台,并在matlab中对利用循环前导信息进行同步的符号同步进行了研究。采用了两种同步算法:最大相关法和最小均方误差(MMSE)法。此外,我们进行了一些仿真,比较了两种算法的性能,得出结论。
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引用次数: 1
A novel bandwidth prediction and queue management scheme for public transportation systems 一种新的公共交通系统带宽预测与队列管理方案
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103931
W. Lai, Kai-Ting Yang, Jiaqiang Guo
With rapid progresses in computing technologies, the integrated and ubiquitous computing environment has been developed into Telematics services, which focus on the safety, amusement and information of vehicles. However, high mobility is an essential characteristic in vehicular communication systems, and also the primary cause of challenges. Existing solutions for wireless communication become ineffective or even infeasible in such highly dynamic network topologies. With considering the regular moving patterns of public transportation systems such as buses, trains and shuttles, this paper proposes a novel channel capacity estimation and queue management scheme for VANET. It takes geographic and time considerations into account and develops an efficient channel capacity estimation scheme. Based on the proposed channel capacity estimation scheme, the proposed scheme can well manage the queues at both RSU and vehicle mobile router (VMR). The simulation results are promising and optimistic and can validate the contributions of the proposed scheme.
随着计算技术的飞速发展,集成的、普适的计算环境已经发展成为以车辆的安全、娱乐和信息为核心的车载信息服务。然而,高移动性是车载通信系统的基本特征,也是挑战的主要原因。现有的无线通信解决方案在这种高度动态的网络拓扑结构中变得无效甚至不可行。考虑到公交、火车、班车等公共交通系统的运行规律,提出了一种新的VANET通道容量估算和队列管理方案。它考虑了地理和时间因素,并开发了一种有效的信道容量估计方案。基于所提出的信道容量估计方案,该方案可以很好地管理RSU和车载移动路由器(VMR)上的队列。仿真结果令人乐观,验证了该方案的有效性。
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引用次数: 2
Convergence architecture of Internet of Things and 3GPP LTE-A network based on IMS 基于IMS的物联网与3GPP LTE-A网络融合架构
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103911
Shimin Yang, X. Wen, Wei Zheng, Zhaoming Lu
In this paper, the convergence of Internet of Things (IoT) and 3GPP LTE-A network is discussed. With the cooperation of enormous smart devices, various kinds of information would be gathered and transmitted to the central control and processing entity, 3GPP LTE-A network provides the ideal access network for the IoT. Meanwhile, there exist several potential issues for the convergence of IoT and 3GPP LTE-A network, such as the convergence architecture of the two networks. We propose an enhanced IMS QoS architecture to support the convergence of IoT and 3GPP LTE-A network, and the architecture would provide flexible services with dynamic requirements to both IoT and LTE-A network. In addition, the signaling to support the session establish/release is discussed.
本文讨论了物联网(IoT)与3GPP LTE-A网络的融合问题。在庞大的智能设备的协同下,各种信息将被收集并传输到中央控制和处理实体,3GPP LTE-A网络为物联网提供了理想的接入网。同时,物联网与3GPP LTE-A网络的融合也存在着一些潜在的问题,比如两种网络的融合架构。为了支持IoT与3GPP LTE-A网络的融合,我们提出了一种增强型IMS QoS架构,该架构可以同时为IoT和LTE-A网络提供灵活的动态需求服务。此外,还讨论了支持会话建立/释放的信令。
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引用次数: 13
Adaptive TDD UL/DL slot utilization for cellular controlled D2D communications 蜂窝控制的D2D通信的自适应TDD UL/DL插槽利用率
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103908
Yu Li, Ting Zhou, Jing Xu, Zhenhong Li, Haifeng Wang
Cellular controlled Device-to-Device (D2D) system is a local service for future communication systems like LTE, LTE-A, etc. D2D communications can share the Uplink (UL) or Downlink (DL) resources with cellular communications to improve system throughput. Since reusing UL resource or DL resource has different merits in different scenarios, if D2D only reuses either UL or DL resource during the whole communication procedure, there may be some problems, such as load balance, interference, etc. This paper proposes a method for adaptively TDD UL/DL slot utilization for D2D communications according to the change of scenario in TD-LTE system. Analysis is made for illustrating our novel method and the advantages are listed.
蜂窝控制的设备对设备(D2D)系统是面向未来通信系统(如LTE、LTE- a等)的本地服务。D2D通信可以与蜂窝通信共享UL (Uplink)或DL (Downlink)资源,提高系统吞吐量。由于在不同的场景下重用UL资源或DL资源有不同的优点,如果D2D在整个通信过程中只重用UL或DL资源中的一个,可能会出现一些问题,如负载平衡、干扰等。针对TD-LTE系统中D2D通信场景的变化,提出了一种自适应利用TDD UL/DL时隙的方法。对新方法进行了分析,并列举了其优点。
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引用次数: 8
Study of SIP protocol through VoIP solution of “Asterisk” 基于“星号”VoIP解决方案的SIP协议研究
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103925
Lu Tian, Nicolas Dailly, Qiao Qiao, Jihua Lu, Jiannan Zhang, Jing Guo, Ji'ao Zhang
Voice over IP is a technology that offers voice communication service over IP-based networks. It has been in a focus of much attention in recent years. SIP, the Session Initiation Protocol is an IETF signaling protocol for session management for text and multimedia exchanges, like VoIP, instant messaging, video, on-line games and other services. Various telephony applications and services, such as VoIP, are implemented in Asterisk, a free open source PABX. In this paper, we highlight the configuration of Asterisk to implement normal calls, voice mail, and conferences on a local network with soft phones. Based on the implementations, we discuss about the signaling exchanges for registering, call establishment and termination, DTMF exchanges.
IP语音是一种在基于IP的网络上提供语音通信服务的技术。近年来,它一直是人们关注的焦点。SIP,即会话发起协议,是一个IETF信令协议,用于文本和多媒体交换的会话管理,如VoIP、即时消息、视频、在线游戏和其他服务。各种电话应用程序和服务,如VoIP,在Asterisk中实现,这是一个免费的开源PABX。在本文中,我们重点介绍了Asterisk在本地网络中使用软电话实现正常通话、语音邮件和会议的配置。在实现的基础上,讨论了信令注册交换、呼叫建立和终止交换、DTMF交换。
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引用次数: 6
A serial concatenated scheme for OvCDM OvCDM的串行连接方案
Pub Date : 2011-10-17 DOI: 10.1109/GMC.2011.6103933
Chun Yang, Wang Jian, Dao-ben Li
A serial concatenated scheme for Overlapped Code Division Multiplexing (OvCDM) system is proposed, characterized in that one or more OvCDM codes are as component codes in serial concatenated OvCDM to make up such a concatenated code with higher spectrum efficiency. The serial concatenated OvCDM uses iterative decoding algorithm based on LOG-MAP Algorithm with soft input soft ouput (SISO). As the simulation results show, the performance of serial concatenated OvCDM is closer to the Shannon limit than that of un-concatenated OvCDM.
提出了一种用于重叠码分复用(OvCDM)系统的串行级联方案,其特点是将一个或多个OvCDM码作为串行级联OvCDM中的分量码,构成具有更高频谱效率的重叠码分复用码。串行级联OvCDM采用基于LOG-MAP算法的软输入软输出(SISO)迭代解码算法。仿真结果表明,串联OvCDM的性能比未串联OvCDM更接近香农极限。
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引用次数: 0
期刊
2011 Global Mobile Congress
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