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2011 Third International Conference on Communications and Mobile Computing最新文献

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Implementation of a 2x2 MIMO-OFDM Real-Time System on DSP/FPGA Platform 基于DSP/FPGA平台的2x2 MIMO-OFDM实时系统的实现
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.125
Jian Sun, Nan Cen, D. Yuan
{"title":"Implementation of a 2x2 MIMO-OFDM Real-Time System on DSP/FPGA Platform","authors":"Jian Sun, Nan Cen, D. Yuan","doi":"10.1109/CMC.2011.125","DOIUrl":"https://doi.org/10.1109/CMC.2011.125","url":null,"abstract":"In this paper we present a 2x2 MIMO-OFDM real-time system based on Sundance's Software Radio development kits, which includes TI DSP, Xilinx FPGA, ADC/DAC and RF modules, etc. As a demonstration, we implement an MIMO-OFDM system, which is a simplification version of two antennas IEEE802.11n standard, on this platform to verify its availability. At transmitter it contains OFDM packet generation, encoding of Alamouti STBC and DUC, and DDC. At receiver, the system contains some necessary receiver algorithms, such as OFDM synchronization, channel estimation, decoding of Alamouti STBC, soft demapper and other components. In addition, the designed platform has greater feasibility and can be used for performance evaluation of newly developed signal processing algorithms.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131766073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Research of Different Quality Map Applying in Kalman Filter Phase Unwrapping 不同质量映射在卡尔曼滤波相位展开中的应用研究
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.19
Man Yan, Guolin Liu, Lifen Wang
{"title":"Research of Different Quality Map Applying in Kalman Filter Phase Unwrapping","authors":"Man Yan, Guolin Liu, Lifen Wang","doi":"10.1109/CMC.2011.19","DOIUrl":"https://doi.org/10.1109/CMC.2011.19","url":null,"abstract":"The original Kalman filter phase unwrapping method uses the coherence obtained from the coherence map to determine the observation equation noise variance. If the coherence map is not obtained, we can use three kinds of quality map to determine the observation equation noise variance. This paper respectively uses pseudo-coherence, phase derivative variance and maximum phase gradient obtained from the pseudo-correlation map, phase derivative variance map and maximum phase gradient map to determine the noise variance. We apply Kalman filter phase unwrapping method for the interferometry synthetic aperture radar data in the two different conditions: the steep terrain and the flat terrain. And we analyze and compare the results in two aspects: the visual analysis and the quantitative analysis. The experiment results show that the result using the phase derivative variance to Kalman filter phase unwrapping is most reliable in the steep terrain, the result using the pseudo-correlation map as the quality map is most precise in the flat terrain.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117192287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Improved Staggered Modulation Method of 8-VSB 一种改进的8-VSB交错调制方法
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.86
Xueping Li, Gang Yang
{"title":"An Improved Staggered Modulation Method of 8-VSB","authors":"Xueping Li, Gang Yang","doi":"10.1109/CMC.2011.86","DOIUrl":"https://doi.org/10.1109/CMC.2011.86","url":null,"abstract":"Two methods of vestigial sideband (VSB) realization, the staggered modulation (SM) and cosine modulation (CM), are analyzed. It is shown that if the SM method is used to eliminate the frequency spectral redundancy, the modulation error rate (MER) performance is lower than CM's. However, the CM scheme is considered to be higher computational complexity. To resolve the existing drawbacks, the improved staggering modulation (ISM) method based on staggered quadrature amplitude modulated (SQAM) is proposed. Utilizing the interpolation filter instead of the time shifting filter, ISM approach simplifies the complexity of modulation without loss of the MER performance.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123236925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Apad: A QoS Guarantee System for Virtualized Enterprise Servers Apad:虚拟化企业服务器的QoS保证系统
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.61
Rui Wang, Fengqian Gao, Qiang Huang, Zhengwei Qi, Haibing Guan
{"title":"Apad: A QoS Guarantee System for Virtualized Enterprise Servers","authors":"Rui Wang, Fengqian Gao, Qiang Huang, Zhengwei Qi, Haibing Guan","doi":"10.1109/CMC.2011.61","DOIUrl":"https://doi.org/10.1109/CMC.2011.61","url":null,"abstract":"Today's data center often employs virtualization to allow multiple enterprise applications to share a common hosting platform in order to improve resource and space utilization. It could be a greater challenge when the shared server becomes overloaded or enforces priority of the common resource among applications in such an environment. In this paper, we propose Apad, a feedback-based resource allocation system which can dynamically adjust the resource shares to multiple virtual machine nodes in order to meet performance target on shared virtualized infrastructure. To evaluate our system design, we built a test bed hosting several virtual machines which employed Xen Virtual Machine Monitor (VMM), and using Apache server along with its workload-generated tool. Our experiment results indicate that our system is able to detect and adapt to resource requirement that changes over time and allocate virtualized resources accordingly to achieve application-level Quality of Service (QoS).","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123661376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploiting Speculative Thread-Level Parallelism Based on Transactional Memory 利用基于事务性内存的推测线程级并行性
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.43
Yaobin Wang, Hong An, Yuan Liu, Wanli Dong, K. Xu
{"title":"Exploiting Speculative Thread-Level Parallelism Based on Transactional Memory","authors":"Yaobin Wang, Hong An, Yuan Liu, Wanli Dong, K. Xu","doi":"10.1109/CMC.2011.43","DOIUrl":"https://doi.org/10.1109/CMC.2011.43","url":null,"abstract":"Thread level speculation (TLS) and Transactional memory (TM) are both promising way to enhance the performance of chip multiprocessor (CMP). The complexity of providing efficient memory accesses buffering mechanism in TLS can be supported by TM logically. This paper proposes a speculative multi-threading model based on transactional memory, including its special hardware, compiler and execution support. It's a low-design-complexity approach to effective unified support for both TLS&TM. The experimental results show that our framework is competent to exploit the speculative thread-level parallelism with little parallel degree loss by the parallel & ordered transaction partition strategy.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124312568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Virtual Sieve: A Distributed Channel Assignment Algorithm Resolving the Hidden Node Problem 虚拟筛:一种解决隐节点问题的分布式信道分配算法
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.47
Zhengmao Yu, W. Feng, Wenzhu Zhang, Lin Zhang, Yong Ren
{"title":"Virtual Sieve: A Distributed Channel Assignment Algorithm Resolving the Hidden Node Problem","authors":"Zhengmao Yu, W. Feng, Wenzhu Zhang, Lin Zhang, Yong Ren","doi":"10.1109/CMC.2011.47","DOIUrl":"https://doi.org/10.1109/CMC.2011.47","url":null,"abstract":"In wireless ad hoc networks, hidden nodes has been an important topic of recent research. This paper proposes a novel and efficient distributed multi-channel assignment algorithm, Virtual Sieve Distributed Channel Assignment Algorithm (VSDCA), for wireless ad hoc networks to avoid hidden node problem. The main purpose of this algorithm is to guarantee all links with hidden node problems to be assigned to different channels. In this paper, it shows that our VSDCA algorithm can completely avoid hidden node problem, and the performance of the network can be dramatically improved compared to previous Carrier Sensing (CS) algorithm.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122105511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Maximum Processing Gain of the Spreading Signal in Multipath Fading Channels 多径衰落信道中扩频信号的最大处理增益
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.77
Wanzhi Ma, Jun Wang, Ying Shen, Youxi Tang
{"title":"The Maximum Processing Gain of the Spreading Signal in Multipath Fading Channels","authors":"Wanzhi Ma, Jun Wang, Ying Shen, Youxi Tang","doi":"10.1109/CMC.2011.77","DOIUrl":"https://doi.org/10.1109/CMC.2011.77","url":null,"abstract":"Considering the joint algorithm of coherent detection and non-coherent detection, we focus on the maximum processing gain of spreading signal, which is 2-dimensional spread spectrum signal, relative to binary phase shift keying (BPSK) and transmitted in rich scattering multipath fading channels. In this paper, we first investigate the processing gain of spreading signal and analyze its expression. Then, by increasing signal bandwidth or symbol period infinitely, we obtain that the processing gain is bounded, and the maximum processing gain is determined by the channel parameters and the energy-per-bit to noise density ratio (Eb/N0). By analysis and simulation, it is shown that the processing gain is not more than 30dB, when the spreading signal relative to BPSK, with Eb/N0 20dB, the maximum Doppler shift 100Hz, and the negative exponential factor 5E-6, is transmitted in rich scattering multipath fading channels.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115898088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NetSecu: A Collaborative Network Security Platform for In-network Security NetSecu:面向网络内安全的协同网络安全平台
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.94
Xinming Chen, Beipeng Mu, Zhen Chen
{"title":"NetSecu: A Collaborative Network Security Platform for In-network Security","authors":"Xinming Chen, Beipeng Mu, Zhen Chen","doi":"10.1109/CMC.2011.94","DOIUrl":"https://doi.org/10.1109/CMC.2011.94","url":null,"abstract":"Malicious attacks are frequently launched to make specified network service unavailable, compromising end hosts for political or business purpose. Though network security appliances are widely deployed to resist these attacks, there is a lack of dynamic and collaborative platform to flexibly configure and manage all the security elements. In this paper, we present NetSecu, a platform based on Java and Click Router, which can dynamically enable, disable and configure security elements such as firewall, IPS and AV. Furthermore, a collaborate module is implemented to integrate individual NetSecu platform into a Secure Overlay Network, providing collaborative traffic control against DDoS attack. Equipped with collaborate module, NetSecu platforms are organized in a tree hierarchy where each level node is registered to its father node. A Central Management Site acts as the root node for large scale deployment. The policy is distributed from higher level to lower level NetSecu nodes, while security events are aggregated from lower level to higher level. Performance evaluation shows that our NetSecu system can achieve line rate with and without security function. Finally we deploy the NetSecu platform in multiple sites, where our design is fully demonstrated and tested.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126871776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Design of Partial Liquid-Filled Hollow-Core Photonic Bandgap Fiber Polarizer 部分充液空心芯光子带隙光纤偏振器的设计
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.10
W. Qian, Chun-liu Zhao, K. Ni, Juan Kang, Shangzhong Jin
{"title":"Design of Partial Liquid-Filled Hollow-Core Photonic Bandgap Fiber Polarizer","authors":"W. Qian, Chun-liu Zhao, K. Ni, Juan Kang, Shangzhong Jin","doi":"10.1109/CMC.2011.10","DOIUrl":"https://doi.org/10.1109/CMC.2011.10","url":null,"abstract":"A novel polarizer is designed by liquid filling in partial air-holes of hollow-core photonic band gap fiber (PBGF) forming an asymmetric waveguide structure, which leads to one polarization leaking out while the orthogonal polarization remains propagating along the fiber with a relatively low loss. Applied a full-vector finite-element (FEM) method, a series of polarizer structures with different water-filled regions has been simulated for a better performance on the polarization extinction ratio and the insertion loss. Through optimization, the proposed polarizer has a high polarization extinction ratio more than 32 dB.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123269232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Three-Phases Scheduling in a Hierarchical Cloud Computing Network 分层云计算网络中的三阶段调度
2011 Third International Conference on Communications and Mobile Computing Pub Date : 2011-04-18 DOI: 10.1109/CMC.2011.28
Shu-Chin Wang, K. Yan, Shun-Sheng Wang, Ching-Wei Chen
{"title":"A Three-Phases Scheduling in a Hierarchical Cloud Computing Network","authors":"Shu-Chin Wang, K. Yan, Shun-Sheng Wang, Ching-Wei Chen","doi":"10.1109/CMC.2011.28","DOIUrl":"https://doi.org/10.1109/CMC.2011.28","url":null,"abstract":"Network bandwidth and hardware technology are developing rapidly, resulting in the vigorous development of the Internet. A new concept, cloud computing, uses low-power hosts to achieve high usability. The cloud computing refers to a class of systems and applications that employ distributed resources to perform a function in a decentralized manner. Cloud computing is to utilize the computing resources (service nodes) on the network to facilitate the execution of complicated tasks that require large-scale computation. Thus, the selecting nodes for executing a task in the cloud computing must be considered. However, in this study, a three-phases scheduling in a hierarchical cloud computing network is advanced. The proposed scheduling can utilize better executing efficiency and maintain the load balancing of system.","PeriodicalId":263741,"journal":{"name":"2011 Third International Conference on Communications and Mobile Computing","volume":"44 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132371678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 58
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