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IEEE 802.16 coexistence through regular channel occupation IEEE 802.16共存通过常规信道占用
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357967
M. Muhleisen, R. Jennen, M. Siddique, C. Gorg
{"title":"IEEE 802.16 coexistence through regular channel occupation","authors":"M. Muhleisen, R. Jennen, M. Siddique, C. Gorg","doi":"10.1109/EW.2009.5357967","DOIUrl":"https://doi.org/10.1109/EW.2009.5357967","url":null,"abstract":"Today's radio frequency regulation is undergoing fundamental changes. There is a high demand for radio frequency spectrum for data communication but no blank spots in the frequency assignments plan. Under the approach of coexistence and cognitive radio, spectrum is made available to systems if a license holder is not using it at a given geographic location or time. In this case multiple systems can compete for spectrum access. In this paper we present an approach how multiple IEEE 802.16 systems can coexist in the same frequency band. The key idea is to define rules how the systems can schedule their transmissions to achieve more regular and therefore more predictable channel occupation. The approach does not require carrier sensing before normal data transmission. Analytic and simulation results are presented showing how systems can estimate available capacity and the impact of their behaviour to own and overall performance. Therefore results for the collision probability are derived.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127681693","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
Reducing the channel estimation error for relay networks with cyclic delay diversity 降低循环时延分集中继网络的信道估计误差
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357975
S. Vorkoper, V. Kuhn
{"title":"Reducing the channel estimation error for relay networks with cyclic delay diversity","authors":"S. Vorkoper, V. Kuhn","doi":"10.1109/EW.2009.5357975","DOIUrl":"https://doi.org/10.1109/EW.2009.5357975","url":null,"abstract":"In this paper we study an amplify-and-forward broadband relay network with cyclic delay diversity. Our main focus resides in reducing the channel estimation error by exploiting the cyclic shift and the properties of the fast Fourier transformation (FFT). Besides the improvement cyclic delay diversity is already delivering at almost no cost at the relays, we show that the bit error rate can be reduced. Furthermore, we investigate channel estimation at the destination and compare the results from scenarios with perfect channel knowledge. It is shown that the performance of the proposed noise reduced channel estimation for a relay network with and without cyclic delay diversity strongly depends on the frequency selectivity of the channels.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126649490","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
Implementation of random linear network coding on OpenGL-enabled graphics cards 在支持opengl的显卡上实现随机线性网络编码
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357971
Péter Vingelmann, Peter Zanaty, F. Fitzek, H. Charaf
{"title":"Implementation of random linear network coding on OpenGL-enabled graphics cards","authors":"Péter Vingelmann, Peter Zanaty, F. Fitzek, H. Charaf","doi":"10.1109/EW.2009.5357971","DOIUrl":"https://doi.org/10.1109/EW.2009.5357971","url":null,"abstract":"This paper describes the implementation of network coding on OpenGL-enabled graphics cards. Network coding is an interesting approach to increase the capacity and robustness in multi-hop networks. The current problem is to implement random linear network coding on mobile devices which are limited in computational power, energy, and memory. Some mobile devices are equipped with a 3D graphics accelerator, which could be used to do most of the RLNC related calculations. Such a cross-over have already been used in computationally demanding research tasks as in physics or medicine. As a first step the paper focuses on the implementation of RLNC using the OpenGL library and NVidia's Cg toolkit on desktop PCs and laptops. Several measurement results show that the implementation on the graphics accelerator is outperforming the CPU by a significant margin. The OpenGL implementation performs relatively better with larger generation sizes due to the parallel nature of GPUs. Therefore the paper shows an appealing solution for the future to perform network coding on mobile devices.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126659045","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: 38
Static and dynamic measurement of the UWB distance dependent path loss 超宽带距离相关路径损耗的静态和动态测量
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357756
R. Cepeda, J. Mcgeehan, M. Umaa, M. Beach
{"title":"Static and dynamic measurement of the UWB distance dependent path loss","authors":"R. Cepeda, J. Mcgeehan, M. Umaa, M. Beach","doi":"10.1109/EW.2009.5357756","DOIUrl":"https://doi.org/10.1109/EW.2009.5357756","url":null,"abstract":"Residential indoor measurements of the line of sight (LOS) and non-LOS (NLOS) distance dependent path loss are analysed from 10 MHz to 4.5 GHz. For these measurements, a time domain sounder is used to interrogate the propagation channel in two ways: static, and dynamic. For the static measurements, the transmit and receive antennas are located at predefined locations and the sounding premises vacated before capturing channel impulse responses (CIRs). For the dynamic measurements, a person displaces the receive antenna over predefined paths while the sounder stores CIRs at specific time intervals. The measurements are compared and analysed, and a modelling scheme is proposed for the continuous simulation of the distance dependent path loss.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124262073","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
Optimal power masking in soft frequency reuse based OFDMA networks 基于软频率复用的OFDMA网络的最优功率掩蔽
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358004
M. Bohge, J. Gross, A. Wolisz
{"title":"Optimal power masking in soft frequency reuse based OFDMA networks","authors":"M. Bohge, J. Gross, A. Wolisz","doi":"10.1109/EW.2009.5358004","DOIUrl":"https://doi.org/10.1109/EW.2009.5358004","url":null,"abstract":"Soft frequency reuse is a strong tool for co-channel interference mitigation in cellular OFDMA/LTE networks. The performance of such networks significantly depends on the configuration of the power masks that implement the soft frequency reuse patterns. In this paper, we investigate the performance of different power mask configurations against the optimal case, in which a central entity optimally distributes power and resource blocks among the users of the network. It is shown that large differences exist between the performance of different mask types and the optimal case in both, the overall cell throughput, as well as the cell-edge user performance.1","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133762544","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: 56
Information combining based ARQ in relay networks 中继网络中基于信息组合的ARQ
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357981
A. Khan, V. Kuhn, S. Vorkoper
{"title":"Information combining based ARQ in relay networks","authors":"A. Khan, V. Kuhn, S. Vorkoper","doi":"10.1109/EW.2009.5357981","DOIUrl":"https://doi.org/10.1109/EW.2009.5357981","url":null,"abstract":"In this paper, we present a novel centralized ARQ technique based on the lower bound on information combining. Contrary to conventional approaches where relays are selected according to the end-to-end quality of the link or decoding status of the relay, we select the minimum number of relays which suffice to allow the destination to successfully decode. Generally, it is believed that if a relay is unable to decode successfully it is useless, here we show that a relay with failures is also useful. We demonstrate that a system considering relays with successful decoding as well as with failures delivers much better performance than a system only considering successful relays for forwarding.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134145082","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
Overview of antenna problems and solutions for multi-Gb/s links 多gb /s链路天线问题及解决方案概述
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357759
J. Andersen, G. Pedersen
{"title":"Overview of antenna problems and solutions for multi-Gb/s links","authors":"J. Andersen, G. Pedersen","doi":"10.1109/EW.2009.5357759","DOIUrl":"https://doi.org/10.1109/EW.2009.5357759","url":null,"abstract":"Fundamental limitations in link budgets for wireless indoor networks are considered for millimeter and THz frequencies. Single small antennas at those frequencies are a bottle neck due to the small absorption areas and the ensuing path loss. Although different for LOS links and links in diffuse surroundings, there are no theoretical limitations, if complexity is ignored. Complexity and power consumption may be reduced by using analog solutions where possible, and in the paper we focus on phase conjugation methods, specifically in retrodirective arrays. Considering power solutions only, mimicking optical networks, we call attention to an array of rectennas.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":" 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132124523","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
Study of the optimum number of radiating elements for different portable devices operating in a MIMO system MIMO系统中不同便携设备的最佳辐射单元数研究
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357996
O. Gago, L. Gonzalez, R. Eickhoff
{"title":"Study of the optimum number of radiating elements for different portable devices operating in a MIMO system","authors":"O. Gago, L. Gonzalez, R. Eickhoff","doi":"10.1109/EW.2009.5357996","DOIUrl":"https://doi.org/10.1109/EW.2009.5357996","url":null,"abstract":"In this paper it is presented a study of the optimum number of radiating elements in a MIMO array for different portable devices working in the 5.6 GHz band. The array configurations are formed using a Vivaldi antenna as radiating element. This study tries to clarify how many elements are possible to allocate in the different form factors to achieve the best possible effective diversity gain (EDG). Laptop, PDA and PCMCIA are the form factors that are used in this study.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117171949","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
Performance comparison of PRC based PAPR reduction schemes for WiLAN Systems WiLAN系统基于PRC的PAPR降低方案的性能比较
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5358005
S. Hussain, D. Guel, Y. Louét, J. Palicot
{"title":"Performance comparison of PRC based PAPR reduction schemes for WiLAN Systems","authors":"S. Hussain, D. Guel, Y. Louét, J. Palicot","doi":"10.1109/EW.2009.5358005","DOIUrl":"https://doi.org/10.1109/EW.2009.5358005","url":null,"abstract":"High peak to average power ratio (PAPR) is a main area of concern in multi-carrier communications as in orthogonal frequency division multiplexing (OFDM) modulated transmission. Several techniques have been devised to reduce the PAPR of the OFDM signal. One of these PAPR reduction techniques is based on peak reducing carriers (PRC) concept where a set of sub-carriers is not used to transmit information but to reduce the temporal signal's peak. There exist different methods to generate the peak reducing carriers like geometric method, gradient method and second order cone programming (SOCP) based optimization method. This paper compares the performance of these three PRC methods for a wireless local area network (WiLAN) system in terms of PAPR reduction capabilities and computational complexities while justifying that neither in-band nor out-of-band interference is generated upon the application of these methods. For an IEEE 802.11g standard, it is found that, on average, SOCP reduces ¿ 2.5 dB more PAPR than geometric method but its complexity is 18 times the complexity of geometric method. While gradient method lies in between these two methods regarding performance and complexity criteria, this paper presents a trade-off between PAPR reduction performance and complexity for three different PRC implementation schemes.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134117735","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
OpenWNS - open Wireless Network Simulator OpenWNS -开放无线网络模拟器
2009 European Wireless Conference Pub Date : 2009-05-17 DOI: 10.1109/EW.2009.5357966
D. Bultmann, M. Muhleisen, K. Klagges, M. Schinnenburg
{"title":"OpenWNS - open Wireless Network Simulator","authors":"D. Bultmann, M. Muhleisen, K. Klagges, M. Schinnenburg","doi":"10.1109/EW.2009.5357966","DOIUrl":"https://doi.org/10.1109/EW.2009.5357966","url":null,"abstract":"This paper presents the open Wireless Network Simulator (openWNS). This simulation tool was developed in the last 5 years at the department of Communication Networks (ComNets) at RWTH Aachen University and has been released as open source software recently. openWNS is a dynamic event driven system level simulation platform that allows for investigation of dynamic protocol behaviour in multi-cellular scenarios with detailed interference modeling. The simulation platform follows a modular design down to protocol building blocks, which makes it possible to rapidly modify the implemented protocol stacks. openWNS currently includes models from physical to application layer. The protocol modules for IEEE 802.16m and IEEE 802.11n-draft are probably the most interesting for the wireless research community.","PeriodicalId":412079,"journal":{"name":"2009 European Wireless Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128889549","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: 42
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