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2008 IEEE International RF and Microwave Conference最新文献

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Prediction of received signal power and propagation path loss in open/rural environments using modified Free-Space loss and Hata models 利用改进的自由空间损耗和Hata模型预测开放/农村环境中接收信号功率和传播路径损耗
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897406
W. A. Shittu, B. Bajoga, F. Anwar, M. Salami
{"title":"Prediction of received signal power and propagation path loss in open/rural environments using modified Free-Space loss and Hata models","authors":"W. A. Shittu, B. Bajoga, F. Anwar, M. Salami","doi":"10.1109/RFM.2008.4897406","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897406","url":null,"abstract":"This paper describes a modification of the Free-Space and Hata formulae for the prediction of received signal power, PR and propagation path loss, LP, in two cellular mobile radio systems (CMRS), in the Northern Nigeria. Measurements of PRs were taken with a Cellular Mobile Radio test Receiver (Sagem OT 160), in some selected open/rural environments, when the receiver was being moved away from the base stations along the propagation paths. LPs were then obtained from values of measured PRs using an appropriate expression. A close comparison of measurement values and computed values from the free-space and Hata formulae revealed that direct application of these formulae is inappropriate for the prediction of these parameters in the region of investigation, as computed values fell short significantly from the corresponding measured values. Consequently, some correction factors have been introduced to both models and these have produced results which closely matched the measured values.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave 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":"126726499","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: 20
Performance analysis for Estimation of signal Parameters via Rotational Invariance Technique (ESPRIT) in estimating Direction of Arrival for linear array antenna 旋转不变性技术估计线阵天线到达方向信号参数的性能分析
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897466
Z. I. Khan, R. A. Awang, A. A. Sulaiman, M. H. Jusoh, N. Baba, M. Kamal, N.I. Khan
{"title":"Performance analysis for Estimation of signal Parameters via Rotational Invariance Technique (ESPRIT) in estimating Direction of Arrival for linear array antenna","authors":"Z. I. Khan, R. A. Awang, A. A. Sulaiman, M. H. Jusoh, N. Baba, M. Kamal, N.I. Khan","doi":"10.1109/RFM.2008.4897466","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897466","url":null,"abstract":"Smart antenna refers to any type of antenna arrays combined with signal processor components which can adjust its own beam pattern in order to emphasize on the signal of interest and minimizing the interference signal. The accurate estimation of direction of interest which is also known as direction of arrival (DOA) of the incident signals is very significant to produce beam from antenna. There are several algorithms those have the ability in calculating the DOA of the incidents signals. In this paper an adaptive antenna is applied by using the most frequent used algorithm, estimation of signal parameters via rotational invariance technique (ESPRIT) to obtain the direction of arrival (DOA) of any incident signals. The exact number of samples and elements used is the most important parameter in the algorithms in order to sustain the accuracy of the direction of arrival of the incident signals. The optimization was done by running the program in cellular mobile environments. The data from the optimization was evaluated using SPSS in evaluating the performance of the algorithm.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"28 5 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":"116636636","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: 25
An iteration method to analyze Nonuniform Transmission Lines 非均匀输电线路的迭代分析方法
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897363
M. Khalaj‐Amirhosseini
{"title":"An iteration method to analyze Nonuniform Transmission Lines","authors":"M. Khalaj‐Amirhosseini","doi":"10.1109/RFM.2008.4897363","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897363","url":null,"abstract":"An iteration method is introduced to analyze arbitrary nonuniform transmission lines (NTLs). In this method, the equations of NTLs are converted to the integral equations. Then the integral equations are solved using an iteration approach. This method is applicable to all arbitrary lossy and dispersive NTLs especially at low frequencies. The validity of the method is verified using some comprehensive examples.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"26 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":"114463539","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
A simple analytical solution for loss in S-bend optical waveguide s弯光波导损耗的简单解析解
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897467
A. Syahriar
{"title":"A simple analytical solution for loss in S-bend optical waveguide","authors":"A. Syahriar","doi":"10.1109/RFM.2008.4897467","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897467","url":null,"abstract":"A new theoretical version of loss calculation in optical waveguides S-bend has been developed. We derived a simple quasi-analytic theory based on integration of a phenomenological absorption coefficient. The general aims are to find simple methods of predicting the loss in bends whose functional form is described by a dasiashape functionpsila y = f(x), where f is continuous in its first derivative. The function we shall consider in detail is that describing a sinusoidal S-shaped bend. In the process, a number of significant anomalies in previously published formulations of bend loss are highlighted and resolved.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"74 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":"124737650","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
Novel computation of expecting interference between FSS and IMT-Advanced for Malaysia 马来西亚FSS与IMT-Advanced预期干扰的新计算
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897367
L. Abdulrazak, Z. Shamsan, A. Aswad, T. Rahman
{"title":"Novel computation of expecting interference between FSS and IMT-Advanced for Malaysia","authors":"L. Abdulrazak, Z. Shamsan, A. Aswad, T. Rahman","doi":"10.1109/RFM.2008.4897367","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897367","url":null,"abstract":"This paper deals with the Interference between Fixed Satellite Service (FSS) and IMT-Advanced (4G) for Malaysian environment. The study initiated within detailed calculations of the current and most useful formulas for path loss effect and clutter loss by using the existing parameters of FSS and the most expected parameters for the IMT-Advanced. Thereafter, FSS axis received gain and radiation pattern had been covered. Furthermore, Site shielding, isolation, off-Axis, In-Band and out of band have been discussed in several scenarios. Calculations, analysis and simulation have been done by using Matlab software. Consequently, extracted conclusions had highlighted the subsistent situation and proposal for future work.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"38 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":"115149491","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
Code rate adaptation for mitigating the effects of Detect And Avoid (DAA) mechanism on the performance of UWB systems 码率自适应以减轻检测与避免(DAA)机制对超宽带系统性能的影响
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897379
A. Rateb, S. Yusof, N. Fisal
{"title":"Code rate adaptation for mitigating the effects of Detect And Avoid (DAA) mechanism on the performance of UWB systems","authors":"A. Rateb, S. Yusof, N. Fisal","doi":"10.1109/RFM.2008.4897379","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897379","url":null,"abstract":"Ultra wideband (UWB) systems can cause potential interference to other narrowband systems sharing the same band, such as WiMax and Wi-Fi. Detect and avoid (DAA) mechanisms were suggested as a cognitive radio-based solution to reduce interference by adaptively reducing the transmitted power at the overlapping bands. Applying this mechanism may result in degrading the performance of UWB transmissions. In this paper, we suggest a minor modification to the DAA mechanism to mitigate this effect while preserving data rate, and thus providing UWB with more reliability. Simulation results show significant improvement in performance over various interference scenarios and data rates.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"10 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":"125743106","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
A novel preliminary study on microwave characterization of Siamese Mangoes ripeness at K-Band 微波表征暹罗芒果k波段成熟度的初步研究
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897370
M.F. Abdul Khalid, A.S. Ramli, N. Baba, H. Saad
{"title":"A novel preliminary study on microwave characterization of Siamese Mangoes ripeness at K-Band","authors":"M.F. Abdul Khalid, A.S. Ramli, N. Baba, H. Saad","doi":"10.1109/RFM.2008.4897370","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897370","url":null,"abstract":"This project presents a microwave non-destructive testing (MNDT) method to determine the ripeness of Siamese mangoes at a frequency range of 18 to 26.5 GHz (K-Band) using free space microwave measurement (FSMM) system. The basic components of the FSMM system are spot focusing horn lens antennas, a vector network analyzer (VNA) and a computer. In this method, the free space reflection, S11 and transmission, S21 coefficients are measured for the samples sandwiched between two Teflon plates that are quarter wavelengths at mid-band. The thru, reflect and line (TRL) calibration technique is used to eliminate the effect of undesirable multiple reflections. The extracted S11 and S21 are keyed in a developed algorithm to calculate the complex permittivity of moisture contents within the samples. Results have shown that the dielectric constants for ripe and unripe mangoes are between 26.3 to 29.5 and 26.1 to 29.2 respectively. Other parameters including loss factor and loss tangent are also discussed.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"10 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":"123652899","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
Modelling of all-optical symmetric Mach-Zehnder switch with asymmetric coupler 非对称耦合器的全光对称Mach-Zehnder开关建模
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897464
N.F. Naim, R. Ngah, T. Prakoso, S. S. Sarnin, H.A. Rahman, Zabih Ghassemlooy
{"title":"Modelling of all-optical symmetric Mach-Zehnder switch with asymmetric coupler","authors":"N.F. Naim, R. Ngah, T. Prakoso, S. S. Sarnin, H.A. Rahman, Zabih Ghassemlooy","doi":"10.1109/RFM.2008.4897464","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897464","url":null,"abstract":"Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunication system is increasing. In these networks, it is desired to carry out switching, routing and processing in optical domain to avoid bottlenecks of optoelectronic conversions. Optical time-division multiplexing (OTDM) technique is one option to implement all optical networks. It provides a single data stream at a very high rate (>100 Gbits/s) using a single wavelength. These networks will be based on optical packet switching. The success of these networks depends on how well switching and routing are being done at this very high speed. An all optical switch based on symmetric Mach-Zehnder (SMZ) with asymmetric coupler (60:40) is proposed. Its characteristics and switching window profiles will be investigated. The results show that symmetric Mach-Zehnder (SMZ) with asymmetric coupler gives a better contrast ratio rather than symmetric Mach-Zehnder (SMZ) with normal 50:50 coupler.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"144 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":"116359101","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: 9
Reconfigurable beam shaping antenna with Wilkinson Power Divider at 5.8GHz 带威尔金森功率分配器的5.8GHz可重构波束整形天线
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897375
M.T. Ali, M. Kamarudin, M. Tan, T. Rahman
{"title":"Reconfigurable beam shaping antenna with Wilkinson Power Divider at 5.8GHz","authors":"M.T. Ali, M. Kamarudin, M. Tan, T. Rahman","doi":"10.1109/RFM.2008.4897375","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897375","url":null,"abstract":"This paper presents a reconfigurable multiple element microstrip rectangular linear array antenna integrated with radio frequency (RF) switches. The corporate feed design concept is used to excite the linear array antenna that consists of 8 elements of rectangular patches at 5.8 GHz. Two PIN diode switches were deployed at the feeding line to activate the two arrays of patches that is located on the left and right side of the antenna structure. The behavior of the reconfigurable multiple element linear antenna array system has been investigated with respect to beam shaping characteristic. The comparisons of the performance between two structures, with Wilkinson power divider (WPD) and without WPD are discussed in this paper. Two different beam patterns were achieved through the reconfigurable antenna at different number of elements design that incorporates with PIN diode switches and modified WPD concept. The simulations and the measurement results for 4 and 8 elements array antenna structure are presented.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"424 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":"126989775","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: 14
A review for development of feedforward linearisation system on radio over fiber links 光纤链路无线电前馈线性化系统的发展综述
2008 IEEE International RF and Microwave Conference Pub Date : 2008-12-01 DOI: 10.1109/RFM.2008.4897421
S. Alifah, S. M. Idrus, N. Kassim
{"title":"A review for development of feedforward linearisation system on radio over fiber links","authors":"S. Alifah, S. M. Idrus, N. Kassim","doi":"10.1109/RFM.2008.4897421","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897421","url":null,"abstract":"Radio over fiber technology provides the efficient and cost effective solution for increased bandwidth demand in wireless area but suffer from performance degradation due to optical transmitter nonlinearity that generates distortion of inband, harmonic and intermodulation in modulating RF signal. A feedforward linearisation is a powerful technique that prefers because can reduce the broadband distortion in microwave/millimeter wave frequencies, reduce the all orders of distortion and the laser relative intensity noise (RIN) simultaneously. This paper reviewed the research progress of feedforward linearisation system in radio over fiber application. Feedforward linearisation system was reported that can suppress third-order intermodulation distortion (IMD3) from 10-20 and RIN reduction from 1-10 dB simultaneously at operating frequency from 0-5 GHz with linearization bandwidth 500-850 MHz. The highest operating frequency is 5.2 GHz with 10 dB IMD3 reduction on 500 MHz linearization bandwidth. Therefore, feedforward linearisation system can improved the RoF performance by linearity improvement so that the system can operate at broadband frequency.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"83 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":"127144406","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
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