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2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)最新文献

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Adaptive route maintenance strategy for dynamic source routing protocol 动态源路由协议的自适应路由维护策略
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542498
M. F. Sjaugi, M. Othman, M. Rasid
{"title":"Adaptive route maintenance strategy for dynamic source routing protocol","authors":"M. F. Sjaugi, M. Othman, M. Rasid","doi":"10.1109/WOCN.2008.4542498","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542498","url":null,"abstract":"Dynamic Source Routing (DSR) [1,2], which is an on-demand routing protocol, becomes the most popular source routing protocol for MANET. Each mobile node is required to maintain route caches that contain the source routes of which the mobile is aware. Although DSR can respond a route quickly, it yields a long delay when a route is rebuilt. This is because when source node receives RERR packet, it will try to find alternative routes from route cache. If alternative routes are not available, source node, then, will enter route discovery phase to find new routes. Finding a route in wireless network require considerable resources, such as time, bandwidth, and power because it relies on broadcasting. As the extension of DISTANCE algorithm presented in [3], Adaptive DISTANCE (ADISTANCE) is proposed in this paper. From simulation result it shows that the adaptive extension of DISTANCE gives ability to work in asynchronous communication network.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126566287","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
Power control in decode-and-forward cooperative systems 译码转发合作系统中的功率控制
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542511
Mi Wengang, T. Lok
{"title":"Power control in decode-and-forward cooperative systems","authors":"Mi Wengang, T. Lok","doi":"10.1109/WOCN.2008.4542511","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542511","url":null,"abstract":"In this paper, a decode-and-forward cooperative communication system is considered with errors forwarded by relays. Maximum ratio combining is performed at the destination without considering whether the forwarded symbols from the relays are incorrect. We analyze the performance of different transmission power strategies at the relays and the source node. We investigate the optimal transmission power control strategy under a fixed total power constraint. Compared with the conventional transmission power distribution where the source and the relays transmit with the same power, the optimal strategy enables significant performance gain at the destination. With a given target probability of error, large power saving can be obtained at the relays. A near-optimal approximation to achieve the performance of the optimal strategy is also given in the paper.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126024492","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
A multiple cross-layers explicit fast handover control using MIH in 802.16e networks 在802.16e网络中使用MIH的多跨层显式快速切换控制
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542535
Hsu-Hung Huang, Jung-Shyr Wu, Shun-Fang Yang
{"title":"A multiple cross-layers explicit fast handover control using MIH in 802.16e networks","authors":"Hsu-Hung Huang, Jung-Shyr Wu, Shun-Fang Yang","doi":"10.1109/WOCN.2008.4542535","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542535","url":null,"abstract":"The ultimate goal for wireless services is to provide a seamless and good quality platform for any kind of application. All relevant protocols or radio access systems provide some techniques to deal with handover problems. The idea of cross-layer is proposed to facilitate handover across different layers. Most of previous research in cross-layer architecture uses SNR or RSSI as triggers to anticipate the layer 2 handover. However, there are problems with the consistence of real handover taken in layer 2 and anticipation handover in upper layers. Also the time point for trigger that sends to upper layers is very critical for fast handover in MIPv6. In this research, we propose a handover procedure combining 802.16e, FMIPv6, SIP, and 802.21 MIH, which ensures explicit handover between 802.16e wireless network and upper layers, to provide seamless service and without packet loss.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132190179","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: 4
Sum power minimization in access point selection with superposition coding scheme 基于叠加编码方案的接入点选择和功率最小化
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542515
Xiao Zheng, T. Lok
{"title":"Sum power minimization in access point selection with superposition coding scheme","authors":"Xiao Zheng, T. Lok","doi":"10.1109/WOCN.2008.4542515","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542515","url":null,"abstract":"How to minimize the sum power is a major concern when allocating multiple users to several access points in a downlink wireless communication system. In this paper, we propose an optimal superposition coding scheme and a very simple sub-optimal scheme. Then, we compare them with time-sharing schemes. Simulation results show that the superposition coding schemes perform much better than the time-sharing schemes because it uses much less transmit power at the same outage probability. In addition, the sub-optimal superposition coding scheme is close to the optimal superposition coding scheme in performance but with a lower complexity.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132415357","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
Underwater acoustic wireless multiuser communication 水声无线多用户通信
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542501
Yin Jingwei, Wang Lei, C. Kai
{"title":"Underwater acoustic wireless multiuser communication","authors":"Yin Jingwei, Wang Lei, C. Kai","doi":"10.1109/WOCN.2008.4542501","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542501","url":null,"abstract":"The characteristics of shallow water are studied in this paper, including multipath spreading, frequency selective attenuation and so on, which is a guidance for disposing communication modems according to the sound velocity profile to mitigate intersymbol interference (ISI) and to improve the underwater acoustic (UWA) communication range. In order to diminish ISI caused by multipath, Virtual Time Reversal Mirror is adopted and its focusing characteristic is validated by simulation. At last, a scheme for UWA multiuser communication based on VTRM is proposed and simulated, which could separate each modem's information by VTRM and permit several modems communicating at the same time.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122203655","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
Performance of an industrial data communication protocol on ethernet network 以太网上工业数据通信协议的性能
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542529
E. Joelianto, Hosana
{"title":"Performance of an industrial data communication protocol on ethernet network","authors":"E. Joelianto, Hosana","doi":"10.1109/WOCN.2008.4542529","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542529","url":null,"abstract":"One of the well known industrial data communication protocols is Modbus which is widely used in industrial automation due to its availability. Modbus protocol can be implemented in many ways according to its network. Performance metrics and tests for IT infrastructure equipment have been used for many years, but now with real-time communication being used more, users are asking whether their desktop, laptop, or palm computer can handle the performance requirements of these network intensive applications. In this paper, Ethernet communication called Modbus TCP/IP will be tested. An extension of the Ethernet network with serial RS485 network will also be considered in relation with two different network topologies.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116318699","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: 18
Speech compression using CELP speech coding technique in GSM AMR 在GSM AMR中使用CELP语音编码技术进行语音压缩
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542547
E. Pryadi, K. Gandi, H. Kanalebe
{"title":"Speech compression using CELP speech coding technique in GSM AMR","authors":"E. Pryadi, K. Gandi, H. Kanalebe","doi":"10.1109/WOCN.2008.4542547","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542547","url":null,"abstract":"In cellular communication technology, quality of voice output at destination depends on the channel condition. Bad channel condition will produce many errors in the voice output and hence the voice quality. To maintain the voice quality in various channel condition AMR is used. Various modes of bit rate is used in AMR, from low to high bit rate is used depend on the channel condition. Low bit rate modes is used in a bad channel condition to allow more bits for channel coding, while high bit rate on the contrary. Recently various speech (source) coding techniques, such as: CELP, ACELP, RPE-LTP, are used in different applications. In this study the application of CELP in AMR is observed. MATLAB program simulation is used to observe and calculate errors occur in the system. The difference of resulted error produced in AMR using CELP is not significant. From low bit rate (5.9 kbps) to high bit rate (12.2 kbps), the error difference is less than 1%.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123679756","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: 12
Queue-Square minimization with adaptive resource allocation in multicarrier CDMA systems 多载波CDMA系统中具有自适应资源分配的队列平方最小化算法
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542549
Yi Huang, Fangyu Hu, T. Lok
{"title":"Queue-Square minimization with adaptive resource allocation in multicarrier CDMA systems","authors":"Yi Huang, Fangyu Hu, T. Lok","doi":"10.1109/WOCN.2008.4542549","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542549","url":null,"abstract":"In this paper, we consider minimizing queue length through suitable resource allocation of power, transmission time, and channels on the downlink for multicarrier CDMA systems. We formulate the allocation into a nonlinear optimization problem and propose the queue-square minimization (QSM) approach to approximately solve this NP hard problem. Simulation results show that the QSM approach yields much better performance than the existing PF and MDU approaches in the literature.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121398394","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
Network traffic anomalies detection and identification with flow monitoring 网络流量异常检测与识别与流量监控
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542524
H. A. Nguyen, Tam V. Nguyen, Dong Il Kim, Deokjai Choi
{"title":"Network traffic anomalies detection and identification with flow monitoring","authors":"H. A. Nguyen, Tam V. Nguyen, Dong Il Kim, Deokjai Choi","doi":"10.1109/WOCN.2008.4542524","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542524","url":null,"abstract":"Network management and security is currently one of the most vibrant research areas, among which, research on detecting and identifying anomalies has attracted a lot of interest. Researchers are still struggling to find an effective and lightweight method for anomaly detection purpose. In this paper, we propose a simple, robust method that detects network anomalous traffic data based on flow monitoring. Our method works based on monitoring the four predefined metrics that capture the flow statistics of the network. In order to prove the power of the new method, we did build an application that detects network anomalies using our method. And the result of the experiments proves that by using the four simple metrics from the flow data, we do not only effectively detect but can also identify the network traffic anomalies.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132842106","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: 27
Design of electro-absorption optical modulator incorporated with waveguide MQW AlGaSb / GaSb and symmetrical Fabry-Perrot grating cavity structure for fiber-optics communication system 基于波导MQW AlGaSb / GaSb和对称法布里-珀罗光栅腔结构的光纤通信系统电吸收光调制器设计
2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542519
P. Priambodo, H. Kartaatmadja, H. Sudibyo, D. Hartanto
{"title":"Design of electro-absorption optical modulator incorporated with waveguide MQW AlGaSb / GaSb and symmetrical Fabry-Perrot grating cavity structure for fiber-optics communication system","authors":"P. Priambodo, H. Kartaatmadja, H. Sudibyo, D. Hartanto","doi":"10.1109/WOCN.2008.4542519","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542519","url":null,"abstract":"Electro-absorption optical modulator based on waveguide structure incorporated with MQW AlGaSb/GaSb and symmetrical Fabry-Perrot (FP) grating cavity structure has been designed for fiber-optics 1.55 mum communication systems. Different to the transversal modulator structure, where the Fabry-Perrot cavity is in the form of thin film layer Bragg Reflector, the modulator with waveguide structure is incorporating symmetrical Fabry-Perrot cavity with grating mirror. The advantage of waveguide modulator in comparison to the transverse structure one is the improvement on the on/off ratio and further being able easily to be integrated with semiconductor laser source and semiconductor amplifier, which are grown on top of the same GaSb substrate. This paper contributes in the development of electro-absorption waveguide modulator design software.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131970981","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
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