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Emulating radio network path losses with hardware hub 用硬件集线器模拟无线网络路径损耗
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464940
Moyuresh Biswas, M. Frater, M. Ryan
{"title":"Emulating radio network path losses with hardware hub","authors":"Moyuresh Biswas, M. Frater, M. Ryan","doi":"10.1109/ATNAC.2009.5464940","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464940","url":null,"abstract":"This paper introduces a framework to emulate the path loss of radio network links in a laboratory environment. The emulator network comprises one or more multiport radio frequency (RF) hubs with variable attenuation on each port to be able to emulate the radio path loss between any two radios. The problem in this emulation approach is the determination of the appropriate port attenuation to match the multi-dimensional link losses (signal attenuations) and signal-to-interference ratios between multiple radios of a practical network. This has been structured as a constraint satisfaction problem (CSP) for both single-hub and multiple-hub emulations. We describe an algorithm based on Freuder's solution synthesis to find the solution to the CSP. Experimental results are also presented to validate the accuracy of emulation.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125253038","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
Body-shadowing effects in indoor MIMO-OFDM channel capacity 室内MIMO-OFDM信道容量中的体影效应
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464720
J. D. Gupta, K. Ziri-Castro
{"title":"Body-shadowing effects in indoor MIMO-OFDM channel capacity","authors":"J. D. Gupta, K. Ziri-Castro","doi":"10.1109/ATNAC.2009.5464720","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464720","url":null,"abstract":"We investigate Multiple-Input and Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems behavior in indoor populated environments that have line-of-site (LoS) between transmitter and receiver arrays. The in-house built MIMO-OFDM packet transmission demonstrator, equipped with four transmitters and four receivers, has been utilized to perform channel measurements at 5.2 GHz. Measurements have been performed using 0 to 3 pedestrians with different antenna arrays (2 × 2, 3 × 3 and 4 × 4). The maximum average capacity for the 2×2 deterministic Fixed SNR scenario is 8.5 dB compared to the 4×4 deterministic scenario that has a maximum average capacity of 16.2 dB, thus an increment of 8 dB in average capacity has been measured when the array size increases from 2×2 to 4×4. In addition a regular variation has been observed for Random scenarios compared to the deterministic scenarios. An incremental trend in average channel capacity for both deterministic and random pedestrian movements has been observed with increasing number of pedestrian and antennas. In deterministic scenarios, the variations in average channel capacity are more noticeable than for the random scenarios due to a more prolonged and controlled body-shadowing effect. Moreover due to the frequent Los blocking and fixed transmission power a slight decrement have been observed in the spread between the maximum and minimum capacity with random fixed Tx power scenario.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"460 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124349924","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: 3
Experiences with a Generation III virtual Honeynet 第三代虚拟蜜网的经验
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464785
Fahim H. Abbasi, R. J. Harris
{"title":"Experiences with a Generation III virtual Honeynet","authors":"Fahim H. Abbasi, R. J. Harris","doi":"10.1109/ATNAC.2009.5464785","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464785","url":null,"abstract":"This paper proposes a methodology for establishing a virtual Honeynet on a VMware Server running Honeywall CDROM Roo. The implementation is specific to a Linux based host having a single physical network interface card. Security of virtual Honeynets is always a concern, special techniques are discussed in the paper to ensure their security and to mitigate associated risks posed to the host and virtual machines. An effort has been made to ensure that all the software (both the OS and associated tools) used for the project are either free or Open Source. Special techniques were implemented in order to enhance the data capture mechanisms on the Linux-based Honeypot to efficiently generate reports. Risk evaluation and suggestions for improvements to the methodology are proposed.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132773943","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: 69
The effect of traffic distribution and transport protocol on WLAN performance 业务分配和传输协议对WLAN性能的影响
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464958
N. Sarkar, K. Sowerby
{"title":"The effect of traffic distribution and transport protocol on WLAN performance","authors":"N. Sarkar, K. Sowerby","doi":"10.1109/ATNAC.2009.5464958","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464958","url":null,"abstract":"Because the statistics of traffic load strongly impact on the queuing and blocking performance of a network, the choice of traffic distribution and transport protocol greatly influences WLAN performance. In this paper we examine the effect of traffic arrival distributions and transport protocols on WLAN performance. In particular, we analyze (by simulation) the effect of four diverse traffic models (Exponential, Pareto, Poisson, and CBR) on the performance of a typical IEEE 802.11 ad hoc network for TCP and UDP. Results obtained show that the network performance for Poisson is almost independent of traffic load for TCP and UDP but not for CBR. However, for both the Pareto and Exponential the network performance is almost independent of load for TCP, but is sensitive to UDP. The network achieves best and worst throughput performance for CBR and Poisson, respectively. Our findings reported in this paper provide some insight into the impact of the choice of traffic models and transport protocols on WLAN performance.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130811682","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
Is broadband over power-lines dead? 电力线上的宽带死了吗?
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464956
C. Kikkert, G. Reid
{"title":"Is broadband over power-lines dead?","authors":"C. Kikkert, G. Reid","doi":"10.1109/ATNAC.2009.5464956","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464956","url":null,"abstract":"Recently there has been a significant amount of publicity about high levels of radiation from power lines using Broadband communications over Power Lines (BPL). Specific interference problems, or experimental measurements are typically cited. For smart grid, smart metering and advanced metering infrastructure applications, low data rate Power Line Communications (PLC) will be required. This paper describes a Matlab® program for calculating the radiation and resistive losses for power lines from BPL and PLC signals. Results are presented for Single Wire Earth Return (SWER) lines, for three phase overhead lines using typical conductors mounted on crossarms and for bundled aerial conductors. These results show that depending on the cable and signal frequency, BPL and PLC can be achieved without causing significant interference.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127702685","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: 3
New transmission scheme with hierarchical modulation in dual-hop wireless relaying systems 双跳无线中继系统中分层调制的新传输方案
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464962
Jeong-Chul Shin, Jee-Hoon Kim, Jin-Hyuk Song, Hyoung-Kyu Song
{"title":"New transmission scheme with hierarchical modulation in dual-hop wireless relaying systems","authors":"Jeong-Chul Shin, Jee-Hoon Kim, Jin-Hyuk Song, Hyoung-Kyu Song","doi":"10.1109/ATNAC.2009.5464962","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464962","url":null,"abstract":"Dual-hop transmission is a technique by which the channel from the source to the destination is split into two possibly shorter links using other nodes. The source transmits signals to the destination via a group of nodes that act as relays. It is an effective technique when the direct link between the source and the destination is in deep fading, severe shadowing, or non-line-of-sight (NLOS) environment. In this network, the reliability of the communications is improved whereas the throughput might go down since the transmission is performed by two times. In this paper, we propose a scheme that uses hierarchical modulation at the source and selective modulation based on cyclic redundancy check (CRC) code at the relays. Simulation results show that our scheme outperforms conventional schemes in terms of the bit error rate (BER) and throughput performances.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129660466","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: 3
Performance and scalability of M/M/c based queuing model of the SIP Proxy Server - a practical approach 基于M/M/c的SIP代理服务器排队模型的性能与可扩展性——一种实用方法
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464717
Sureshkumar V. Subramanian, R. Dutta
{"title":"Performance and scalability of M/M/c based queuing model of the SIP Proxy Server - a practical approach","authors":"Sureshkumar V. Subramanian, R. Dutta","doi":"10.1109/ATNAC.2009.5464717","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464717","url":null,"abstract":"In recent years, Session Initiation Protocol (SIP) based Voice over IP (VoIP) based applications are alternative to the traditional Public Switched Telephone Networks (PSTN) because of its flexibility in the implementation of new features and services. The Session Initiation Protocol (SIP) is becoming a popular signaling protocol for Voice over IP (VoIP) based applications. The SIP Proxy server is a software application that provides call routing services by parsing and forwarding all the incoming SIP packets in an IP telephony network. The efficiency of this process can create large scale, highly reliable packet voice networks for service providers and enterprises. Since, SIP Proxy server performance can be characterized by its transaction states of each SIP session, we proposed the M/M/c performance model of the SIP Proxy Server and studied some of the key performance benchmarks such as server utilization, queue size and memory utilization. Provided the comparative results between the predicted results with the experimental results conducted in a lab environment.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"25 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120899696","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: 17
Performance evaluation of multiple-antenna DS-CDMA wireless communication systems with different diversity combining methods 不同分集组合方式下多天线DS-CDMA无线通信系统性能评价
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464955
Md. Rubaiyat H. Mondal, M. Hossain
{"title":"Performance evaluation of multiple-antenna DS-CDMA wireless communication systems with different diversity combining methods","authors":"Md. Rubaiyat H. Mondal, M. Hossain","doi":"10.1109/ATNAC.2009.5464955","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464955","url":null,"abstract":"The effects of multipath fading and additive white Gaussian noise (AWGN) on the bit error rate (BER) performance of direct-sequence code-division multiple-access (DS-CDMA) systems is studied in this paper. The expression for the conditional BER, conditioned on a given level of fading is derived and then the unconditional BER is evaluated. The BER performance results of the system are evaluated in a fading channel for different magnitude of fading. The proposed approach is also extended to estimate the BER performance of the CDMA system having multiple receiving antennas. The effectiveness of the selection method and maximal ratio combining (MRC) method as diversity combining schemes are investigated and compared. To enhance the system performance channel coding is also applied to the system.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"467 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116026037","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
Staged request routing for reduced carbon footprints of large scale server systems 分阶段请求路由，减少大规模服务器系统的碳足迹
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464964
A. Kist
{"title":"Staged request routing for reduced carbon footprints of large scale server systems","authors":"A. Kist","doi":"10.1109/ATNAC.2009.5464964","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464964","url":null,"abstract":"The power consumption of server systems used as part of online services is an important problem as these have become major energy users. Generally, such systems are dimensioned for peak loads and typically have average utilisations of 20–30%. This paper introduces a simple routing mechanism that uses overflow techniques to assign requests to these servers. As these mechanisms employ a staged process, idle systems can be suspended. For a rising number of servers, this yields a load proportional power profile. Request distribution is implemented by a router device; servers report their utilisation to the router. Idle systems suspend their operation; suspended systems are returned to the active state by the Wake-on-LAN function. The system design, performance models and initial results are presented.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127706866","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: 2
FWM impairment in multi-wavelength optical code-division multiplexing systems 多波长光码分复用系统中的FWM损伤
2009 Australasian Telecommunication Networks and Applications Conference (ATNAC) Pub Date : 2009-11-01 DOI: 10.1109/ATNAC.2009.5464786
N. Dang, A. Pham
{"title":"FWM impairment in multi-wavelength optical code-division multiplexing systems","authors":"N. Dang, A. Pham","doi":"10.1109/ATNAC.2009.5464786","DOIUrl":"https://doi.org/10.1109/ATNAC.2009.5464786","url":null,"abstract":"This paper comprehensively analyzes the impact of four wave mixing (FWM) on the performance of multiwavelength optical code-division multiplexing (MW-OCDM) systems. The impact of FWM on various aspects of MW-OCDM system performance, including bit error rate (BER), the number of users, and power penalty, is quantitatively discussed with several types of optical fibers such as single mode fiber (SMF), dispersion-shifted fiber (DSF), and non-zero DSF considering different frequency spacings. We find that the operational range of optical power is strictly limited under the impact of FMW. For example, it is about 6 dB in the case of spectral amplitude encoding OCDM systems using MQC code (132, 12, 1) and SMF. Also, the impact of FWM can be relieved so as to extend the operational power range by using two dimensional (2-D) codes (especially when different time-spreading patterns are used) or increasing the frequency spacing.","PeriodicalId":224107,"journal":{"name":"2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124446042","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: 2
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