2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)最新文献_第6页

A CDMA scheme with optimum terminal filters based on channel prediction to mitigate multipath channel effects 一种基于信道预测的终端滤波器优化CDMA方案，可缓解多径信道效应

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542541

K. Rama Naidu, R. R. Raja Kumar, T. S. Lamba

引用次数: 0

On the provisioning of guaranteed QoS in wireless sensor networks through limited service polling models 有限服务轮询模型在无线传感器网络中提供有保证的QoS

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542495

M. Aalsalem, M. Iftikhar, J. Taheri, Albert Y. Zomaya

{"title":"On the provisioning of guaranteed QoS in wireless sensor networks through limited service polling models","authors":"M. Aalsalem, M. Iftikhar, J. Taheri, Albert Y. Zomaya","doi":"10.1109/WOCN.2008.4542495","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542495","url":null,"abstract":"Data gathering in a timely and reliable fashion has been a key concern in wireless sensor networks particularly related to military applications. The introduction of real time communication has created additional challenges in this area with different communication constraints. Since sensor networks represent a new generation of time-critical applications, it is often necessary for communication to meet real time constraints. However, research dealing with providing QoS guarantees for real time traffic in sensor networks is still immature. To provide guaranteed QoS in WSN, this paper presents a novel analytical model based on limited service polling discipline. The proposed model implements two queues in a sensor node which are being served according to round robin service. The model is based on M/D/l queueing system (a special class of M/G/l queueing systems), which takes into account two different classes of traffic in a sensor node. The exact queueing delay in a sensor node for corresponding classes is calculated. Further, the analytical results are validated through an extensive simulation study.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"76 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":"129156041","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

Cross correlation and PAPR analysis of frequency shuffled sub-carrier based CI/OFDM modulation system for fading channels 衰落信道中基于混频子载波的CI/OFDM调制系统的互相关和PAPR分析

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542514

M.Z. Alam, M. Alom, M. Hossain, M. Sobhan

引用次数: 3

The analysis of IEEE802.16e MAC layer overhead and efficiency in PMP topology PMP拓扑下IEEE802.16e MAC层开销和效率分析

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542550

A. Ulvan, V. Andrlik, R. Bestak

引用次数: 2

Flexible TXOP assignments for efficient QoS scheduling in IEEE 802.11e WLANs IEEE 802.11e无线局域网中高效QoS调度的灵活TXOP分配

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542513

Jeng-Ji Huang, Che-Yu Chang, H. Ferng

{"title":"Flexible TXOP assignments for efficient QoS scheduling in IEEE 802.11e WLANs","authors":"Jeng-Ji Huang, Che-Yu Chang, H. Ferng","doi":"10.1109/WOCN.2008.4542513","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542513","url":null,"abstract":"A basic concept in 802.11e is Transmission Opportunities (TXOPs). The draft amendment of IEEE 802.11e includes a Simple Scheduler, in which a fixed length of TXOPs is assigned according to mean data rates. Since some traffic present bursts of variable size, several enhancements have been proposed previously; e.g., TXOPs are allocated according to the actual buffered data which is indicated through transmissions performed in the previous TXOP. Though the allocations are efficient in channel utilization, a delay could inevitably be incurred by packets, due to that new arrivals cannot be transmitted in the current TXOP, but have to wait until next. In this paper, an efficient scheduling scheme is proposed that aims at improving packet delay while maintaining high channel utilization. In the proposed scheme, maximal residual bandwidth is assigned to a station taking into account demands from all the other stations, and the unused portion is reclaimed. From extensive simulation results, it is shown that packet delay is effectively improved, compared to two previous enhancements of the Simple Scheduler, while achieving high throughput performance.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"38 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":"114586182","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: 6

Simulation of tropical rain attenuation for evaluation of millimeter-wave wireless network 用于评估毫米波无线网络的热带雨衰减模拟

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542526

A. Mauludiyanto, P. Hutajulu, G. Hendrantoro

引用次数: 6

Optimized WLAN MAC protocol for multimedia applications 针对多媒体应用优化了WLAN MAC协议

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542484

Hushairi Zen, D. Habibi, Alexander Rassau, I. Ahmad

{"title":"Optimized WLAN MAC protocol for multimedia applications","authors":"Hushairi Zen, D. Habibi, Alexander Rassau, I. Ahmad","doi":"10.1109/WOCN.2008.4542484","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542484","url":null,"abstract":"In this paper we propose an optimized WLAN MAC protocol for multimedia applications. The proposed MAC protocol consist of 3 main optimizing architectures, traffic segregation, specific service interval (SI) for voice and video traffic and smaller contention window (CW). Traffic segregation segregates real-time traffic from best-effort traffic while specific service interval provides voice and video traffic with the SI based on its mean arrival rate. In the contention time frame, the CW is made smaller to reduce delay and increase throughput. Ns2 is used as a simulating tool to compare the results of our proposed protocol with the legacy 802.11 and the 802.11e protocols. We show that our protocol has significantly better throughput than the legacy 802.11 and the 802.11e. Fluctuations in the throughput is also shown to be lower in our proposed protocol. The technique implemented also provides easier and better management of realtime traffic to support guaranteed quality of service (QoS).","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"22 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121016618","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

Analysis of tropical attenuation statistics using synthetic storm for millimeter-wave wireless network design 用于毫米波无线网络设计的合成风暴热带衰减统计分析

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542528

H. Mahmudah, A. Wijayanti, A. Mauludiyanto, G. Hendrantoro, A. Matsushima

引用次数: 8

Absolute Polar Duty Cycle Division Multiplexing: An economical and spectral efficient multiplexing technique 绝对极性占空比分复用:一种经济高效的频谱复用技术

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542548

M. Abdullah, A. M. Mohammadi, G. Mahdiraji, A. Abas, M. Mokhtar

{"title":"Absolute Polar Duty Cycle Division Multiplexing: An economical and spectral efficient multiplexing technique","authors":"M. Abdullah, A. M. Mohammadi, G. Mahdiraji, A. Abas, M. Mokhtar","doi":"10.1109/WOCN.2008.4542548","DOIUrl":"https://doi.org/10.1109/WOCN.2008.4542548","url":null,"abstract":"A new multiplexing technique based on duty cycle division is proposed, under the name: absolute polar duty cycle division multiplexing (APDCDM). The new technique allows for more efficient use of time slots as well as the spectrum, taking the advantage of both the conventional TDM and FDM. The basic properties based on theoretical analysis as well as simulation studies have been done to evaluate the performance of this technique based on the signal energy and symbol error rate (SER). In this paper the performance of absolute polar duty cycle division multiplexing is compared with multilevel M-ary as well as with the time division multiplexing (TDM) techniques. The simulation has been set for wireless transmission based on free space propagation model with adaptive white Gaussian noise (AWGN). PSK and QAM are used as modulation schemes to evaluate these techniques against data rates and number of users. The study shows that by increasing the number of users, the energy per bit in APDCDM has better performance than that of TDM technique. The simulation result correspond with the theoretical study shows that absolute polar duty cycle division multiplexing (APDCDM), has better SER than TDM.","PeriodicalId":363625,"journal":{"name":"2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08)","volume":"21 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":"129788033","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: 6

Cross layer design for orthogonal space time block coded optical MIMO systems 正交空时分组编码光学MIMO系统的交叉层设计

2008 5th IFIP International Conference on Wireless and Optical Communications Networks (WOCN '08) Pub Date : 2008-05-05 DOI: 10.1109/WOCN.2008.4542497

S.A.R. Zaidi, M. Hafeez

引用次数: 15