Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382370
Jing An, Chang Li, Donghong Wang
Due to the flexibility and freedom of the P2P e-commerce environment, peers often make transactions with other unknown peers, the trust evaluation becomes critical. Traditionally the trust evaluation model is based on feedback mechanism, which only depends on transactions number neglecting the amount of transaction, etc. This may lead to the transaction risk in the new transaction. In this paper, a novel trust evaluation model is presented, which reflects recommender's trust value and transaction amounts when computing the trust value of peer. In addition, the model introduces the factor of transaction period while updating peer's trust value, which embodies that the feedback occurred in different period have different influence to peer's trust value. Therefore results of trust evaluation become more accurate, the novel trust evaluation model is effective against malicious behavior.
{"title":"A novel trust evaluation model for peer-to-peer e-commerce","authors":"Jing An, Chang Li, Donghong Wang","doi":"10.1109/YCICT.2009.5382370","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382370","url":null,"abstract":"Due to the flexibility and freedom of the P2P e-commerce environment, peers often make transactions with other unknown peers, the trust evaluation becomes critical. Traditionally the trust evaluation model is based on feedback mechanism, which only depends on transactions number neglecting the amount of transaction, etc. This may lead to the transaction risk in the new transaction. In this paper, a novel trust evaluation model is presented, which reflects recommender's trust value and transaction amounts when computing the trust value of peer. In addition, the model introduces the factor of transaction period while updating peer's trust value, which embodies that the feedback occurred in different period have different influence to peer's trust value. Therefore results of trust evaluation become more accurate, the novel trust evaluation model is effective against malicious behavior.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124740198","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382385
Wenjun Xie, G. Wen, Haiyan Jin
The Quad Flat No Lead or QFN package, a near CSP lead frame, is a promising choice for portable wireless applications such as BluetoothTM and RF SoC. Excellent attributes of this advanced package include miniaturized footprint, good electrical performance and excellent thermal characteristics. In this paper, the parasitic parameters of one signal path for a typical 32 I/O (0.5 mm pitch)QFN package structure, were extracted precisely using Ansoft HFSS and ADS of the Agilent company.
Quad Flat No Lead或QFN封装，一个接近CSP的引线框架，是便携式无线应用(如BluetoothTM和RF SoC)的一个有前途的选择。这种先进封装的优异属性包括小型化的占地面积、良好的电气性能和优异的热特性。本文利用安哲伦公司的Ansoft HFSS和ADS精确提取了典型的32 I/O (0.5 mm间距)QFN封装结构的一个信号路径的寄生参数。
{"title":"Extraction of parasitic parameters for QFN32","authors":"Wenjun Xie, G. Wen, Haiyan Jin","doi":"10.1109/YCICT.2009.5382385","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382385","url":null,"abstract":"The Quad Flat No Lead or QFN package, a near CSP lead frame, is a promising choice for portable wireless applications such as BluetoothTM and RF SoC. Excellent attributes of this advanced package include miniaturized footprint, good electrical performance and excellent thermal characteristics. In this paper, the parasitic parameters of one signal path for a typical 32 I/O (0.5 mm pitch)QFN package structure, were extracted precisely using Ansoft HFSS and ADS of the Agilent company.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123668113","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}
This paper proposes a design and realization of a monitoring platform for SFP optical transceiver module. With the adoption of this platform, the real-time temperature, power supply, bias current, transmit power and receiver power of optical transceiver module's monitoring can be realized. The measurement of these parameters will help to forecast the fault and find the fault position of optical link. With the forecast of the fault, the unit that may be faulted can be displaced early and the cost will be reduced. By malfunction orientation, the technical staff can find the fault position of optical link in a short time, the time of repairing becomes shorter. The use of this platform simplifies the maintenance work and enhances the reliability of communication system.
{"title":"The design and realization of a monitoring platform for SFP optical transceiver module","authors":"Jin-lin Zhou, Yang-an Zhang, Minglun Zhang, Yong-Qing Huang, Liming Zhou, Xiao-ping Long, Ling Li","doi":"10.1109/YCICT.2009.5382340","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382340","url":null,"abstract":"This paper proposes a design and realization of a monitoring platform for SFP optical transceiver module. With the adoption of this platform, the real-time temperature, power supply, bias current, transmit power and receiver power of optical transceiver module's monitoring can be realized. The measurement of these parameters will help to forecast the fault and find the fault position of optical link. With the forecast of the fault, the unit that may be faulted can be displaced early and the cost will be reduced. By malfunction orientation, the technical staff can find the fault position of optical link in a short time, the time of repairing becomes shorter. The use of this platform simplifies the maintenance work and enhances the reliability of communication system.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125345327","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382318
Lianjing Cui, Hai Wang, Chao Dong
As an important branch of Media Access Control (MAC) protocol for Mobile Ad Hoc networks (MANETs), slotted MAC protocol with high efficiency is to pursue high throughput as well as reduce the overhead. Based on data-flow-classification method which is very mature in Internet, the paper proposes a novel distributed Flow-Driven MAC protocol (FD-MAC) for MANETs. FD-MAC reserves the slots for the elephant flows which are popular in MANETs to improve their throughput and the piggyback reservation technique is used to decrease the overhead. At the same time the mice flows contend for other unreserved slots. Simulation results show that FD-MAC performs superior to IEEE 802.11 protocol in high load environment where vast elephant flows exist. Using FD-MAC, the throughput for the elephant flows is improved up to 45% comparing to IEEE 802.11 protocol and the overhead of FD-MAC is only 10% of IEEE 802.11 protocol.
{"title":"A novel distributed Flow-Driven TDMA protocol for MANETs","authors":"Lianjing Cui, Hai Wang, Chao Dong","doi":"10.1109/YCICT.2009.5382318","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382318","url":null,"abstract":"As an important branch of Media Access Control (MAC) protocol for Mobile Ad Hoc networks (MANETs), slotted MAC protocol with high efficiency is to pursue high throughput as well as reduce the overhead. Based on data-flow-classification method which is very mature in Internet, the paper proposes a novel distributed Flow-Driven MAC protocol (FD-MAC) for MANETs. FD-MAC reserves the slots for the elephant flows which are popular in MANETs to improve their throughput and the piggyback reservation technique is used to decrease the overhead. At the same time the mice flows contend for other unreserved slots. Simulation results show that FD-MAC performs superior to IEEE 802.11 protocol in high load environment where vast elephant flows exist. Using FD-MAC, the throughput for the elephant flows is improved up to 45% comparing to IEEE 802.11 protocol and the overhead of FD-MAC is only 10% of IEEE 802.11 protocol.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129432126","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382373
Yicheng Lin, Wenbo Wang, Jiong Shi, Li Wang, Lan Shao
In this paper, we study the resource allocation problem in the downlink of an OFDMA system. Taking into account the constraint that each user can be assigned only one modulation and coding scheme (MCS), our goal is to maximize the system utility, which can be either the sum rate of users or certain fairness metric. The joint subcarrier, rate, and power allocation problem is formulated, and a straightforward suboptimal algorithm is proposed to solve this problem efficiently. Through computer simulation, our proposed algorithm is verified to be better in performance compared to the existing ones.
{"title":"Resource allocation for OFDMA downlink with per-user MCS constraint","authors":"Yicheng Lin, Wenbo Wang, Jiong Shi, Li Wang, Lan Shao","doi":"10.1109/YCICT.2009.5382373","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382373","url":null,"abstract":"In this paper, we study the resource allocation problem in the downlink of an OFDMA system. Taking into account the constraint that each user can be assigned only one modulation and coding scheme (MCS), our goal is to maximize the system utility, which can be either the sum rate of users or certain fairness metric. The joint subcarrier, rate, and power allocation problem is formulated, and a straightforward suboptimal algorithm is proposed to solve this problem efficiently. Through computer simulation, our proposed algorithm is verified to be better in performance compared to the existing ones.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127186797","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382441
Zhou Naibao, Peng Jin, Wei Bing
With the development of mobile Internet and distributed technologies, the traditional telecommunications network is subject to many challenges. Skype, a popular peer-to-peer VoIP (Voice over IP) application, shows the gigantic advantage of distributed communication. Therefore, we are trying to design a Next Generation Core Network (NGCN), which utilizes distributed technologies such as P2P, cloud computing, virtualization, etc. It can not only provide traditional telecom services, but also better support the high-bandwidth consumption services in 4G, such as Streaming, file-sharing and so on. This paper first introduces the NGCN architecture, layered architecture model and the P2P overlay design, and then analyzes the future network capabilities demands. The NGCN we provide is distributed, self-organization and scalable.
{"title":"NGCN: A P2P-based distributed next generation core network towards 4G","authors":"Zhou Naibao, Peng Jin, Wei Bing","doi":"10.1109/YCICT.2009.5382441","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382441","url":null,"abstract":"With the development of mobile Internet and distributed technologies, the traditional telecommunications network is subject to many challenges. Skype, a popular peer-to-peer VoIP (Voice over IP) application, shows the gigantic advantage of distributed communication. Therefore, we are trying to design a Next Generation Core Network (NGCN), which utilizes distributed technologies such as P2P, cloud computing, virtualization, etc. It can not only provide traditional telecom services, but also better support the high-bandwidth consumption services in 4G, such as Streaming, file-sharing and so on. This paper first introduces the NGCN architecture, layered architecture model and the P2P overlay design, and then analyzes the future network capabilities demands. The NGCN we provide is distributed, self-organization and scalable.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125293476","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382397
Chang Li, Yafeng Wang, Fei Dong, Dacheng Yang
User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains. In this paper, we examine the performance of coded cooperation scheme in fixed relay system, where channel coding is employed between source and relay. Simulation results are presented and show that it is always providing better performance and a higher throughput compared to decode and forward protocol. In addition to the diversity advantage, coded cooperation is based on incremental redundancy and thus receives coding gain.
{"title":"Performance analysis for coded cooperation protocol in fixed relay system","authors":"Chang Li, Yafeng Wang, Fei Dong, Dacheng Yang","doi":"10.1109/YCICT.2009.5382397","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382397","url":null,"abstract":"User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains. In this paper, we examine the performance of coded cooperation scheme in fixed relay system, where channel coding is employed between source and relay. Simulation results are presented and show that it is always providing better performance and a higher throughput compared to decode and forward protocol. In addition to the diversity advantage, coded cooperation is based on incremental redundancy and thus receives coding gain.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125308010","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382414
Jianjun Zhang, Lixiang Sun, Hong Yuan
In GPS signal indoor positioning system, the signal intensity received by the different channels of receiver are diverse when GPS signal penetrate buildings. In the process of weak signal acquisition, the cross correlation interference between the strong and weak signal will lead to the decrease of the signal to noise ratio of weak signal. However, it is difficult to assess the attenuation degree. According to the crosscorrelation between characteristics of GPS satellite signals, the equivalent carrier to noise ratio analysis method based on the spectral separation coefficient is proposed, The attenuation degree of signal carrier to noise ratio caused by the strong interferential signals with the changing Doppler shift is derived, which provides theoretical basis for assessing the influence of strong interferential signal on weak signal. Analysis of theoretical value and simulation results verify the accuracy of the proposed method.
{"title":"Assessment and research on the Self-Interference of GPS weak signal acquisition in indoor location environment","authors":"Jianjun Zhang, Lixiang Sun, Hong Yuan","doi":"10.1109/YCICT.2009.5382414","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382414","url":null,"abstract":"In GPS signal indoor positioning system, the signal intensity received by the different channels of receiver are diverse when GPS signal penetrate buildings. In the process of weak signal acquisition, the cross correlation interference between the strong and weak signal will lead to the decrease of the signal to noise ratio of weak signal. However, it is difficult to assess the attenuation degree. According to the crosscorrelation between characteristics of GPS satellite signals, the equivalent carrier to noise ratio analysis method based on the spectral separation coefficient is proposed, The attenuation degree of signal carrier to noise ratio caused by the strong interferential signals with the changing Doppler shift is derived, which provides theoretical basis for assessing the influence of strong interferential signal on weak signal. Analysis of theoretical value and simulation results verify the accuracy of the proposed method.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126835098","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382460
Chuanfu Xu, Yonggang Che, Jianbin Fang, Zhenghua Wang
In parallel performance simulation of parallel systems, a large amount of Logic Processes (LP) must be mapped to relatively small number of Physical Elements (PE). Previous researches have shown that different mapping schemes could result in significant variation in the whole parallel simulation cost. In this paper, we propose, implement, and evaluate a Minimum Communication-guided Mapping (MiniCoM) scheme for large-scale trace-driven parallel performance simulation. Guided by extracted information about interactions among LPs from previously generated traces, MiniCoM can map some most frequently interacted LPs to the same PE while trying to keep load balance between PEs. The mapping aims to minimize realistic communications among PEs which may run on different nodes of host systems with large inter-node latency. We use BigSim simulator and two target programs to evaluate MiniCoM. Our results show that MiniCoM is more efficient than blocked mapping adopted by BigSim: it can reduce the total parallel simulation runtime by up to 49%.
{"title":"Towards efficient mapping in large-scale trace-driven parallel performance simulation","authors":"Chuanfu Xu, Yonggang Che, Jianbin Fang, Zhenghua Wang","doi":"10.1109/YCICT.2009.5382460","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382460","url":null,"abstract":"In parallel performance simulation of parallel systems, a large amount of Logic Processes (LP) must be mapped to relatively small number of Physical Elements (PE). Previous researches have shown that different mapping schemes could result in significant variation in the whole parallel simulation cost. In this paper, we propose, implement, and evaluate a Minimum Communication-guided Mapping (MiniCoM) scheme for large-scale trace-driven parallel performance simulation. Guided by extracted information about interactions among LPs from previously generated traces, MiniCoM can map some most frequently interacted LPs to the same PE while trying to keep load balance between PEs. The mapping aims to minimize realistic communications among PEs which may run on different nodes of host systems with large inter-node latency. We use BigSim simulator and two target programs to evaluate MiniCoM. Our results show that MiniCoM is more efficient than blocked mapping adopted by BigSim: it can reduce the total parallel simulation runtime by up to 49%.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127949038","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}
Pub Date : 2009-09-01DOI: 10.1109/YCICT.2009.5382433
Yang Gao, F. Huang, Jia Hua Cheng, Lianhong Wu
A CMOS down-conversion mixer for MB-OFDM (Multi-Band Orthogonal Frequency Division Multiplexing) UWB (Ultra-Wide Band) application is presented. The mixer is implemented with a double-balanced Gilbert-cell architecture and adopts dynamic current source to improve noise performance. Two inductors are also introduced to reduce the flicker noise. Designed in SMIC 0.18 µm CMOS process, simulation results show a conversion gain of 9 to 11.5 dB, a noise figure of 10.8 to 13.2 dB, and an input-referred third-order intercept point of −10.5 to −8.2 dBm. The power consumption of the mixer core is 11.3 mW.
{"title":"A 3.1∼4.8 GHz wideband mixer for MB-OFDM UWB receivers with improved noise performance","authors":"Yang Gao, F. Huang, Jia Hua Cheng, Lianhong Wu","doi":"10.1109/YCICT.2009.5382433","DOIUrl":"https://doi.org/10.1109/YCICT.2009.5382433","url":null,"abstract":"A CMOS down-conversion mixer for MB-OFDM (Multi-Band Orthogonal Frequency Division Multiplexing) UWB (Ultra-Wide Band) application is presented. The mixer is implemented with a double-balanced Gilbert-cell architecture and adopts dynamic current source to improve noise performance. Two inductors are also introduced to reduce the flicker noise. Designed in SMIC 0.18 µm CMOS process, simulation results show a conversion gain of 9 to 11.5 dB, a noise figure of 10.8 to 13.2 dB, and an input-referred third-order intercept point of −10.5 to −8.2 dBm. The power consumption of the mixer core is 11.3 mW.","PeriodicalId":138803,"journal":{"name":"2009 IEEE Youth Conference on Information, Computing and Telecommunication","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129061242","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}
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