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Servicing Best Effort Traffic Using nrtPS on Fixed WiMAX 在固定WiMAX上使用nrtPS服务最佳努力流量
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783345
S. Perera, Harsha Sirisena
{"title":"Servicing Best Effort Traffic Using nrtPS on Fixed WiMAX","authors":"S. Perera, Harsha Sirisena","doi":"10.1109/ATNAC.2008.4783345","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783345","url":null,"abstract":"IEEE 802.16 is a wireless metropolitan area broadband access technology which provides layer two service differentiation for many types of traffic flows. In this paper the transport of uplink best effort traffic from the subscriber to the base station is considered. The performance of best effort service class is analyzed and compared with non-real-time polling service class which can also be used for low priority flows such as file transfer and Web traffic. We propose performance enhancements and modifications to increase the efficiency of the nrtPS class. Namely using a dynamic polling period based on the activity on the connection, using dummy keep alive messages when inactive and releasing idle connections to conserve bandwidth.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130220259","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
Evolutionary Multi-Channel Management based on Mobility in Multi-Hops Heterogeneous Wireless Networks 多跳异构无线网络中基于移动性的进化多通道管理
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783305
Ming-Shen Jian, S. Hsu
{"title":"Evolutionary Multi-Channel Management based on Mobility in Multi-Hops Heterogeneous Wireless Networks","authors":"Ming-Shen Jian, S. Hsu","doi":"10.1109/ATNAC.2008.4783305","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783305","url":null,"abstract":"This paper develops an evolutionary multiple channel management based on mobility in multiple hop wireless network. The n-hops limitation theories are proposed first. Based upon these theories, the enhanced multiple channel management is proposed which consists of channel assignment method and topology prediction method. The channel assignment method is based on the enhanced genetic algorithm. Mobile devices are assigned different data channels individually and can be directly established without any RES message cost. All mobile nodes can communicate based upon the assigned potential channels. Also, due to the change of topology of all mobile devices, a topology prediction method is proposed to predict the velocities and directions of all mobile nodes. Simulation shows that the proposed management can make the success communication about 9.7~129.3% more than the competing algorithm.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122960132","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
Radiation Losses from a Single Wire Earth Return Power Line with Bends 带弯曲的单线回地电力线的辐射损耗
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783315
C. Kikkert, G. Reid
{"title":"Radiation Losses from a Single Wire Earth Return Power Line with Bends","authors":"C. Kikkert, G. Reid","doi":"10.1109/ATNAC.2008.4783315","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783315","url":null,"abstract":"It is desirable to use existing single wire earth return (SWER) lines for data communication as well as transmitting power in remote areas. The radiation losses of the communication signal is a critical system design parameter. Existing radiation models are not adequate since they assume: firstly that the antenna is a small number of wavelengths long and secondly that the currents along the line are constant, so that no power lost in radiation. The model presented here overcomes these limitations. The model shows that bends in the SWER line significantly effect both the radiated power and the radiation patterns.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129167095","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: 7
Design & Implementation of a Secure Sensitive Information System for Wireless Mobile Devices 无线移动设备安全敏感信息系统的设计与实现
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783293
Xianping Wu, Huy Hoang Ngo, P. D. Le, B. Srinivasan
{"title":"Design & Implementation of a Secure Sensitive Information System for Wireless Mobile Devices","authors":"Xianping Wu, Huy Hoang Ngo, P. D. Le, B. Srinivasan","doi":"10.1109/ATNAC.2008.4783293","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783293","url":null,"abstract":"Protecting sensitive information systems from security threats such as unauthorised access, information eavesdropping and information interfering, is significant. Most of the natural approaches employ strong authentication and/or cryptography systems to protect critical data. But those approaches do not stress on the potential amount of risks associated with sensitive information, especially the vulnerability of long term cryptographic keys. Therefore, in this paper, a secure sensitive information system is proposed and implemented based on a dynamic key generation technique. It associates with elliptic curve key exchange protocol as a design solution for wireless mobile devices to achieve critical information data security and network security.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134288431","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
Minimization of Error in Pitch Detection algorithm using Discrete Fractional Cosine Transform 基于离散分数余弦变换的基音检测算法误差最小化
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783358
M. Hasan, M. L. Kabir
{"title":"Minimization of Error in Pitch Detection algorithm using Discrete Fractional Cosine Transform","authors":"M. Hasan, M. L. Kabir","doi":"10.1109/ATNAC.2008.4783358","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783358","url":null,"abstract":"A novel Discrete Fractional Cosine Transform implementation for pitch estimation of noisy speech using dominant harmonic is introduced in this paper. The basic idea is to preprocess the speech signal with discrete fractional cosine transform before using the rectified dominant harmonic for signal reshaping. The performance of the proposed method is tested and compared with the latest previous method using Keele pitch extraction reference database. Comparative results show that the proposed method can detect pitch with better accuracy in terms of gross and fine pitch error as compared to the latest technique.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116481260","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
Capacity and power control in spread spectrum macro-diversity radio networks revisited 扩频宏分集无线网络的容量和功率控制
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783335
V. Rodriguez, R. Mathar, A. Schmeink
{"title":"Capacity and power control in spread spectrum macro-diversity radio networks revisited","authors":"V. Rodriguez, R. Mathar, A. Schmeink","doi":"10.1109/ATNAC.2008.4783335","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783335","url":null,"abstract":"Macro-diversity - all base stations decode cooperatively each received signal - can mitigate shadow fading, and increase the capacity of a spread-spectrum communication network. Assuming that a terminal's transmission power contributes to its own interference, the literature determines whether a vector of quality-of-service targets is feasible through a simple formula, which is insensitive to the terminals' channel gains. Herein, through Banach' contraction-mapping principle - and without the self-interference approximation - a new low-complexity capacity formula is derived. Through its dependence on relative channel gains, the new formula adapts itself in a sensible manner to special conditions, such as when most terminals can only be heard by a subset of the receivers. Under such conditions, the original may significantly overestimate capacity.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121191426","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
On Multi-Channel MAC Protocols in Cognitive Radio Networks 认知无线网络中的多通道MAC协议研究
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783340
A.K.-L. Yau, P. Komisarczuk, Paul D. Teal
{"title":"On Multi-Channel MAC Protocols in Cognitive Radio Networks","authors":"A.K.-L. Yau, P. Komisarczuk, Paul D. Teal","doi":"10.1109/ATNAC.2008.4783340","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783340","url":null,"abstract":"Cognitive Radio (CR) exploits underutilized licensed spectrums to improve its bandwidth availability. Using CR technology, a node is able to adapt its transmission and reception radio parameters including channel frequency dynamically according to local spectrum availability. For channel access between wireless nodes, a cognitive Medium Access Control (MAC) protocol is necessary to coordinate the CRs. Multi-channel MAC protocol extensions have been proposed in IEEE802.11 to enable a node to operate in multiple channels in order to improve network-wide throughput. These multi-channel MAC protocols have several functions that can be leveraged by cognitive MAC protocols due to their similarities in certain aspects, though the CR has an additional requirement to cope with the existence of licensed users that have higher authority over the channels. Current research in cognitive MAC protocols assumes the availability of a common control channel at all times, which is an approach in the multi-channel MAC protocols. This approach has certain hardware requirements that may not be readily available at CR nodes. Hence, other approached may be necessary. In this paper, various types of multi-channel MAC protocols are reviewed, followed by discussion of their merits and demerits in multi-channel environments. The purpose is to show the additional functionalities and challenges that each multi-channel MAC protocol has to offer and address in order to operate in multihop CR networks. By providing discussion on possible technology leverage from multi-channel to cognitive MAC protocols, we aim to establish a foundation for further research and discussion.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131515295","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
Joint Time-domain/Frequency-domain Impulsive Noise Reduction in OFDM-based Power Line Communications 基于ofdm的电力线通信时域/频域脉冲噪声联合降噪
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783311
K. Al-Mawali, A. Sadik, Z. M. Hussain
{"title":"Joint Time-domain/Frequency-domain Impulsive Noise Reduction in OFDM-based Power Line Communications","authors":"K. Al-Mawali, A. Sadik, Z. M. Hussain","doi":"10.1109/ATNAC.2008.4783311","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783311","url":null,"abstract":"Impulsive noise is one of the major challenges in power line communications and can cause serious problems in OFDM-based PLC systems. In this paper, we propose a combined Time-Domain/Frequency-domain technique for impulsive noise reduction in OFDM-based PLC systems. The performance of the proposed technique is studied against well known time-domain nonlinearities by means of computer simulations. The obtained simulation results show that the Combined TD/FD technique performs better than practically used nonlinearities and can reduce the adverse effect of impulsive noise significantly.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121474204","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: 40
Self-restraint Admission Control for adhoc WLANs 自适应无线局域网的自我约束准入控制
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783320
Hushairi Zen, D. Habibi, I. Ahmad
{"title":"Self-restraint Admission Control for adhoc WLANs","authors":"Hushairi Zen, D. Habibi, I. Ahmad","doi":"10.1109/ATNAC.2008.4783320","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783320","url":null,"abstract":"Admission control is an important mechanism for sustaining throughput and supporting quality of service (QoS) for real-time traffic in a wireless local area network (WLAN). In an adhoc WLAN scenario where no access point (AP) is available, admission control has to be self-managed by each node. We propose a self-restraining admission control mechanism that works by monitoring the congestion level of the network in the adhoc WLAN. Wireless nodes can listen to all nodes within their range and be aware of the collision rates. A node wishing to join the network measures the current collision rate, and predicts the post-admission collision rate, on the basis of which the self-restraining mechanism in the node decides if it can join the network. We analyse the impact of key parameters, such as the collision threshold level, on the performance of the self-restraining mechanism and show that this mechanism works effectively in sustaining traffic in an adhoc WLAN.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114999094","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: 5
Source Localisation in Wireless Sensor Networks Based on Optimised Maximum Likelihood 基于优化最大似然的无线传感器网络源定位
2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-09-01 DOI: 10.1109/ATNAC.2008.4783329
Mohammed Rahman, Edith Cowan, D. Habibi, I. Ahmad, M. Z. Rahman
{"title":"Source Localisation in Wireless Sensor Networks Based on Optimised Maximum Likelihood","authors":"Mohammed Rahman, Edith Cowan, D. Habibi, I. Ahmad, M. Z. Rahman","doi":"10.1109/ATNAC.2008.4783329","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783329","url":null,"abstract":"Maximum likelihood (ML) is a popular and effective estimator for a wide range of diverse applications and currently affords the most accurate estimation for source localisation in wireless sensor networks (WSN). ML however has two major shortcomings namely, that it is a biased estimator and is also highly sensitive to parameter perturbations. An Optimisation to ML (OML) algorithm was introduced that minimises the sum-of-squares bias and exhibits superior performance to ML in statistical estimation, particularly with finite datasets. This paper proposes a new model for acoustic source localisation in WSN, based upon the OML estimation process. In addition to the performance analysis using real world field experimental data for the tracking of moving military vehicles, simulations have been performed upon the more complex source localisation and tracking problem, to verify the potential of the new OML-based model.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116969468","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: 5
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