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WAMICON 2011 Conference Proceedings最新文献

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Improving bit error rate of STBC-OFDM using convolutional and Turbo codes over Nakagami-m fading channel 利用卷积码和Turbo码在Nakagami-m衰落信道上提高STBC-OFDM的误码率
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872904
Heba R. Ahamed, H. Elkamchouchi
{"title":"Improving bit error rate of STBC-OFDM using convolutional and Turbo codes over Nakagami-m fading channel","authors":"Heba R. Ahamed, H. Elkamchouchi","doi":"10.1109/WAMICON.2011.5872904","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872904","url":null,"abstract":"In this paper, a new trend of Space Time Block codes-Orthogonal Frequency Division Multiplexing (STBC-OFDM) with Convolutional and Turbo codes. The applied method is based on Alamouti's scheme[1].We examine the performance of two, three and four transmitters with one receiver over Nakagami-m fading channel using convolutional and turbo codes using different types of modulation such as BPSK and 64-QAM . Also we examine their performance using turbo code with different rates (1/2, 1/3) at BPSK. The performance of two transmitters with two receivers is also shown using convolutional and turbo codes over Nakagami-m fading channel at BPSK.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"339 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122993175","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
Receiver design - Tutorial 接收机设计-教程
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872891
James Offner
{"title":"Receiver design - Tutorial","authors":"James Offner","doi":"10.1109/WAMICON.2011.5872891","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872891","url":null,"abstract":"Numerous interrelated trade-offs are undertaken for any receiver or receive chain design, which must be jointly optimized for the intended operational environment. Some of the requirements resulting from this environment are: noise figure (NF), input 3rd order intercept point (IP3), input 1dB compression point (P1dB), dynamic range, input desensitization level, non-damage input power, out-of-band (OOB) interference rejection, gain and output power. This paper focuses on these requirements and the subtleties associated with achieving them.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126777906","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
Integrated filter/antennas with high efficiency and increased bandwidth 集成滤波器/天线，效率高，带宽增加
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872870
Y. Yusuf, X. Gong
{"title":"Integrated filter/antennas with high efficiency and increased bandwidth","authors":"Y. Yusuf, X. Gong","doi":"10.1109/WAMICON.2011.5872870","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872870","url":null,"abstract":"Two methods of integrating high-Q 3-D filters with antennas are presented to achieve very high efficiency and increased bandwidth. In one approach, a three-pole cavity filter is integrated with a slot antenna, which acts as an equivalent load of the filter. A total filter/antenna efficiency of 83% and an antenna efficiency of 98%, respectively, are achieved with a filter/antenna bandwidth of 4.8%. In the other approach, a two-pole cavity filter is integrated with a patch antenna, which adds an additional pole and forms a three-pole filter/antenna. A total filter/antenna efficiency of 91% is realized with a filter/antenna bandwidth of 8.5%. This novel filter/antenna integration technique also significantly reduces the form factor of the integrated RF front end. Prototype three-pole Chebyshev filter/antennas for both cases are demonstrated at X band. The measured impedance matching, efficiency, gain, and radiation pattern closely match simulation results.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128233228","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
Small coupled double loop antennas for dual band GPS arrays 用于双频GPS阵列的小型耦合双环天线
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872864
Saurabh Gupta, G. Mumcu, P. Herzig
{"title":"Small coupled double loop antennas for dual band GPS arrays","authors":"Saurabh Gupta, G. Mumcu, P. Herzig","doi":"10.1109/WAMICON.2011.5872864","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872864","url":null,"abstract":"Small footprint coupled double loop (CDL) antennas are presented for dual band anti-jam GPS arrays. Miniaturization is achieved by employing a readily available ε<inf>r</inf>=9.8 substrate and lumped coupling capacitors. A CDL GPS antenna prototype having 1″×1″ (λ<inf>0</inf>/9.6×λ<inf>0</inf>/9.6 at L2 band) footprint over a 0.5″ thick 1.6″×1.6″ substrate is shown to operate with 3.8dB and 3.3dB measured gains at the L2 and L1 bands, respectively. To realize the smallest possible GPS array, the performance parameters of the CDL antenna are investigated in detail as a function of its substrate size.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128681700","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: 8
Controlling terahertz waves with meta-materials and photonic bandgap structures 用超材料和光子带隙结构控制太赫兹波
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872861
D. Shchegolkov, N. Moody, E. Simakov, Abul Azad, J. O’Hara
{"title":"Controlling terahertz waves with meta-materials and photonic bandgap structures","authors":"D. Shchegolkov, N. Moody, E. Simakov, Abul Azad, J. O’Hara","doi":"10.1109/WAMICON.2011.5872861","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872861","url":null,"abstract":"We will describe research conducted at Los Alamos National Laboratory towards developing components for controlling terahertz waves. We employ meta-materials and, particularly, meta-films, as very compact absorbers for controlling quasi-optical beams. We believe that dielectric photonic bandgap structures could replace ordinary metal waveguide devices at THz, since metal structures become extremely lossy in this frequency range. We are also acquiring new measurement equipment which will allow us to enhance capabilities of testing THz components.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116907855","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
Design of an 8-element switched mode circular antenna array for vehicular direction finding 车辆测向用8元切换模式圆形天线阵的设计
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872880
M. Sharawi, D. Aloi
{"title":"Design of an 8-element switched mode circular antenna array for vehicular direction finding","authors":"M. Sharawi, D. Aloi","doi":"10.1109/WAMICON.2011.5872880","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872880","url":null,"abstract":"In this work we present the design and fabrication of an 8-element circular printed yagi antenna array that is operated in switched mode for a radio frequency direction finding system in vehicular platforms. The array is designed to operate in the 2.45 GHz frequency band. The directional gain patterns have a HPBW between 65 - 110 degrees in the azimuth plane which will be used to identify the direction of the incoming RF signal from one of 8 sectors. The introduction of ground splits in the ground plane gave a better shaped directional pattern as well as better matching. Simulation and measurement results are shown and compared.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127055886","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
Low power wireless sensor node for use in building automation 用于楼宇自动化的低功耗无线传感器节点
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872856
G. U. Gamm, M. Kostić, M. Sippel, L. Reindl
{"title":"Low power wireless sensor node for use in building automation","authors":"G. U. Gamm, M. Kostić, M. Sippel, L. Reindl","doi":"10.1109/WAMICON.2011.5872856","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872856","url":null,"abstract":"In modern buildings the majority of sensors and actuators used for controlling temperature, roller shutters or alarm systems are cable wired. The use of wireless sensor nodes in such a scenario would facilitate the installation and would reduce costs significantly. However the main problem is the energy consumption of the nodes. Real time behavior and lifespans of several years seem to be conflictive. In this work we present a wireless sensor node with attached wake-up radio, that consumes as few as 2.78 µA current in sleep mode. The wake-up signal that triggers the node from sleep to active mode consists of an 125 kHz square signal modulated on an 868 MHz carrier. For a selective wake-up of different nodes the 125 kHz signal is additionally modulated with an 16 bit address information. In a sleeping node the incoming wake-up signal is passively demodulated and fed to a separate 125 kHz wake-up receiver IC. The sensitivity of the node was measured to −50dBm which means a wake-up distance of 40 meters at +10dBm output power in an open space scenario. Inside buildings the signal was able to pass through two concrete walls.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134181628","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
A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers 采用波形工程方法设计高效率宽带MMIC放大器
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872859
D. Fitzpatrick, R. Saini, J. Lees, J. Benedikt, S. Cripps, P. Tasker
{"title":"A waveform engineering approach to the design of improved efficiency wideband MMIC amplifiers","authors":"D. Fitzpatrick, R. Saini, J. Lees, J. Benedikt, S. Cripps, P. Tasker","doi":"10.1109/WAMICON.2011.5872859","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872859","url":null,"abstract":"This paper describes a design methodology based on waveform engineering within a harmonic active load-pull system and utilizing the Cardiff Direct Look-Up Table (DLUT) model. The process seeks to address some of the key issues facing designers when using nonlinear simulation of high power microwave amplifiers: model validity, boundary conditions and yield. The application of this process to the design of a 0.5 W, 5–10 GHz GaAs pHEMT with good PAE is detailed.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132330188","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
On limitation of clipping and filtering in IEEE 802.11g based wireless LAN system 基于IEEE 802.11g的无线局域网系统中滤波和滤波的限制
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872892
Taewoo Lee, H. Ochiai
{"title":"On limitation of clipping and filtering in IEEE 802.11g based wireless LAN system","authors":"Taewoo Lee, H. Ochiai","doi":"10.1109/WAMICON.2011.5872892","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872892","url":null,"abstract":"IEEE 802.11g wireless LAN and IEEE 802.11n as its multiple-input multiple-output (MIMO) extension have become a de facto standard for recent indoor wireless communication technology. They adopt orthogonal frequency division multiplexing (OFDM) for its high bandwidth efficiency and robustness against multipath fading, but the OFDM signal generally bears high peak-to-average power ratio (PAPR). In IEEE 802.11g/n systems, in order to prevent distortion of signal in power amplifier (PA), a large input back-off (IBO) should be chosen prior to its amplification. This, in turn, reduces the efficiency of PA. Clipping and filtering (CAF) is a simple approach to mitigating high PAPR problem. However, since it causes signal distortion associated with nonlinear clipping, its applicability is limited considering that the practical system should meet the requirements in terms of error vector magnitude (EVM) and adjacent channel interference (ACI). In this paper, through an experiment using real PA, we investigate the effectiveness of the CAF and reveal its limitation in the framework of the IEEE 802.11g systems. We derive the most appropriate clipping ratio (CR) that satisfies the requirements of IEEE 802.11g.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129743537","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
The ground plane effect of a small meandered line antenna 小型弯曲线天线的地平面效应
WAMICON 2011 Conference Proceedings Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872862
I. Nassar, T. Weller
{"title":"The ground plane effect of a small meandered line antenna","authors":"I. Nassar, T. Weller","doi":"10.1109/WAMICON.2011.5872862","DOIUrl":"https://doi.org/10.1109/WAMICON.2011.5872862","url":null,"abstract":"In this paper a discussion of the effect of the size and position of the ground plane of a meandered line antenna operating at 2.4 GHz is presented. The meandered line antenna was first designed with a ground plane that extends underneath the antenna. In order to improve the antenna performance, the ground plane was truncated and its position underneath the antenna was changed. These adjustments to the ground improved the antenna efficiency by a factor of 3.6, bandwidth by a factor of 2, as well as achieving omni-directional radiation patterns. However, the changes also resulted in high current distribution on the coaxial test cable, which was then corrected by extending the ground plane width.","PeriodicalId":253374,"journal":{"name":"WAMICON 2011 Conference Proceedings","volume":"3 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130967094","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: 8
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