Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897436
R. Rashid, W. M. A. E. W. Embong, N. Fisal
We propose an enhanced lightweight medium access control (eL-MAC) protocol which combines scheduled based MAC mechanism and adaptive multi-timeslot allocation (AMTA). Wireless sensor network (WSN) consists of tiny wireless devices typically cooperate with each other to aggregate sensor data to the base station. It is increasingly being used in a wide range of environmental application. Such applications like habitat monitoring, large-scale industrial monitoring and urban population monitoring require years of operation period with low rate data transmission. Hence, providing a reliable data transmission and efficiency in energy usage are critical in order to prolong the network lifetime. eL-MAC solves the problems that normally happen in WSN such as idle listening, over hearing and hidden terminal problem, by introducing a slotting communication mechanism where node only transmits in its own timeslot and sleep in other time slot if there is no activity. Furthermore, eL-MAC allows multiple timeslots to be occupied by a node according to the traffic requirement. The simulation result shows our protocol prolongs the network lifetime compared to LMAC mechanism, without reducing the channel utilization.
{"title":"Enhanced lightweight medium access protocol with adaptive multi-timeslot allocation for wireless sensor network","authors":"R. Rashid, W. M. A. E. W. Embong, N. Fisal","doi":"10.1109/RFM.2008.4897436","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897436","url":null,"abstract":"We propose an enhanced lightweight medium access control (eL-MAC) protocol which combines scheduled based MAC mechanism and adaptive multi-timeslot allocation (AMTA). Wireless sensor network (WSN) consists of tiny wireless devices typically cooperate with each other to aggregate sensor data to the base station. It is increasingly being used in a wide range of environmental application. Such applications like habitat monitoring, large-scale industrial monitoring and urban population monitoring require years of operation period with low rate data transmission. Hence, providing a reliable data transmission and efficiency in energy usage are critical in order to prolong the network lifetime. eL-MAC solves the problems that normally happen in WSN such as idle listening, over hearing and hidden terminal problem, by introducing a slotting communication mechanism where node only transmits in its own timeslot and sleep in other time slot if there is no activity. Furthermore, eL-MAC allows multiple timeslots to be occupied by a node according to the traffic requirement. The simulation result shows our protocol prolongs the network lifetime compared to LMAC mechanism, without reducing the channel utilization.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"330 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113956146","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897452
S. Yusof, A. Zamani
Orthogonal frequency division multiplexing (OFDM) is proven a successful technique in wireless communication system which is sensitive to carrier frequency offset (CFO). The effect of CFO introduces intercarrier interference (ICI) to OFDM system. The purpose of this paper is to reduce ICI using ICI self-cancellation in MIMO-OFDM system by data allocation in space-time-frequency (STF). This paper also presents data allocation of complex pair to reduce peak-to-average power ratio (PAPR). Simulations by comparing STF MIMO-OFDM with conventional OFDM show an optimistic result especially at a high Eb/No.
{"title":"Intercarrier interference self-cancellation for space-time-frequency MIMO-OFDM system","authors":"S. Yusof, A. Zamani","doi":"10.1109/RFM.2008.4897452","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897452","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is proven a successful technique in wireless communication system which is sensitive to carrier frequency offset (CFO). The effect of CFO introduces intercarrier interference (ICI) to OFDM system. The purpose of this paper is to reduce ICI using ICI self-cancellation in MIMO-OFDM system by data allocation in space-time-frequency (STF). This paper also presents data allocation of complex pair to reduce peak-to-average power ratio (PAPR). Simulations by comparing STF MIMO-OFDM with conventional OFDM show an optimistic result especially at a high Eb/No.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"24 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":"125192047","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897392
Mohammad M. Tajdini, A. A. Shishegar
In this paper, a novel closed form expression is derived to find the Green' s function of a horizontal electric current in a parallel-plate waveguide. It is achieved by expanding the Green' s function into a series of Gaussian functions. This new method is called the Gaussian Green' s function (GGF) method. The main advantage of the GGF method lies in its precision as well as rapid convergence. Numerical results confirm that the closed form expression yields less than 0.2% error compared to the numerical integration of the spectral integral. Furthermore, it is verified that this method can be in excellent agreement with the complex images (CI) method.
{"title":"The Gaussian expansion of the Green's function of an electric current in a parallel-plate waveguide","authors":"Mohammad M. Tajdini, A. A. Shishegar","doi":"10.1109/RFM.2008.4897392","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897392","url":null,"abstract":"In this paper, a novel closed form expression is derived to find the Green' s function of a horizontal electric current in a parallel-plate waveguide. It is achieved by expanding the Green' s function into a series of Gaussian functions. This new method is called the Gaussian Green' s function (GGF) method. The main advantage of the GGF method lies in its precision as well as rapid convergence. Numerical results confirm that the closed form expression yields less than 0.2% error compared to the numerical integration of the spectral integral. Furthermore, it is verified that this method can be in excellent agreement with the complex images (CI) method.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"32 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":"124889909","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897407
T. Prakoso, R. Ngah, T. A. Rahman, M. A. Mualif
Due to its low propagation loss, large bandwidth, and competitive cost, optical fiber become one of the best solution for the backhaul. However, new fiber network deployment is still very expensive in outdoor and rural environment. This paper proposes and evaluates design of 5.8 GHz photonic antenna in a radio over fiber system for point-to-point applications. Simulation result shows that the proposed system can support 540 Mbps, 16-QAM, at 5.8 GHz for optical fiber length of 30 km, and extended with wireless distance of 10 km.
{"title":"5.8 GHz photonic antenna for point to point applications","authors":"T. Prakoso, R. Ngah, T. A. Rahman, M. A. Mualif","doi":"10.1109/RFM.2008.4897407","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897407","url":null,"abstract":"Due to its low propagation loss, large bandwidth, and competitive cost, optical fiber become one of the best solution for the backhaul. However, new fiber network deployment is still very expensive in outdoor and rural environment. This paper proposes and evaluates design of 5.8 GHz photonic antenna in a radio over fiber system for point-to-point applications. Simulation result shows that the proposed system can support 540 Mbps, 16-QAM, at 5.8 GHz for optical fiber length of 30 km, and extended with wireless distance of 10 km.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"81 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":"130077594","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897355
V. Thakare, P. Singhal, K. Das
An artificial neural network has been developed for the calculation of bandwidth of resonant microstrip antenna. The network training data is generated using IE3D an electromagnetic simulator. An example of inset feed rectangular microstrip patch antenna is being considered. A feed forward network structure is preferred for bandwidth calculation. Results of the network are compared with the data obtained from IE3D simulator and concluded that results are in good agreement with simulator findings.
{"title":"Calculation of Microstrip antenna bandwidth using Artificial Neural Network","authors":"V. Thakare, P. Singhal, K. Das","doi":"10.1109/RFM.2008.4897355","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897355","url":null,"abstract":"An artificial neural network has been developed for the calculation of bandwidth of resonant microstrip antenna. The network training data is generated using IE3D an electromagnetic simulator. An example of inset feed rectangular microstrip patch antenna is being considered. A feed forward network structure is preferred for bandwidth calculation. Results of the network are compared with the data obtained from IE3D simulator and concluded that results are in good agreement with simulator findings.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave 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":"131093330","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897416
G. C. Hock, C. Chakrabarty, M. H. Badjian, S. Devkumar, Emilliano
This paper describes the use of AD8302 evaluation board from Analog Devices in super-heterodyne millimeter wave interferometer for dielectric measurement. The measurements are performed without direct contact on the millimeter wave material. Signals from the output of two mixers in the interferometer were obtained for phase shifting analysis. They are used as inputs to the evaluation board. The output from the evaluation board was connected to computer for data processing. The voltage values obtained from the board was then converted to phase angle by using the pre-calibrated data and LabViewtrade graphical programming language.
{"title":"Super-heterodyne interferometer for non-contact dielectric measurements on millimeter wave material","authors":"G. C. Hock, C. Chakrabarty, M. H. Badjian, S. Devkumar, Emilliano","doi":"10.1109/RFM.2008.4897416","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897416","url":null,"abstract":"This paper describes the use of AD8302 evaluation board from Analog Devices in super-heterodyne millimeter wave interferometer for dielectric measurement. The measurements are performed without direct contact on the millimeter wave material. Signals from the output of two mixers in the interferometer were obtained for phase shifting analysis. They are used as inputs to the evaluation board. The output from the evaluation board was connected to computer for data processing. The voltage values obtained from the board was then converted to phase angle by using the pre-calibrated data and LabViewtrade graphical programming language.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"97 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":"131997602","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897453
H. Abd-El-Raouf, S. Syed, Y. Antar
Two double negative (DNG) metamaterial antennas are presented. The design of the unit cell of each one of the two antennas is based on the composite right/left-handed (CRLH) transmission line (TL) model. Two designs are introduced using single and double layer structures. The dispersion diagrams of the proposed antennas are evaluated and the resonant frequencies of the different modes in the RH and the LH ranges are determined from the dispersion diagrams. Field animations of the near field below the patches and near the vias for different modes will be presented.
{"title":"Design of small antennas based on DNG metamaterials","authors":"H. Abd-El-Raouf, S. Syed, Y. Antar","doi":"10.1109/RFM.2008.4897453","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897453","url":null,"abstract":"Two double negative (DNG) metamaterial antennas are presented. The design of the unit cell of each one of the two antennas is based on the composite right/left-handed (CRLH) transmission line (TL) model. Two designs are introduced using single and double layer structures. The dispersion diagrams of the proposed antennas are evaluated and the resonant frequencies of the different modes in the RH and the LH ranges are determined from the dispersion diagrams. Field animations of the near field below the patches and near the vias for different modes will be presented.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"138 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":"123265193","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897363
M. Khalaj‐Amirhosseini
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.
{"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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897446
T. Prakoso, R. Ngah, T. A. Rahman
Active photonic antenna (APhA) designed for 2.4 GHz communication in downlink side is proposed. The APhA consists of photodiode, RF amplifier and band pass filter (BPF) in small package, integrated with RF antenna. The APhA design is simulated using optical communication simulation software at varied fiber length and free space loss (FSL). Performance improvement over passive photonic antenna (PPhA) in term of signal power, SNR, constellation diagram, and BER is achieved, especially at PPhA service boundary.
{"title":"Active photonic antenna for wireless communications at 2.4 GHz","authors":"T. Prakoso, R. Ngah, T. A. Rahman","doi":"10.1109/RFM.2008.4897446","DOIUrl":"https://doi.org/10.1109/RFM.2008.4897446","url":null,"abstract":"Active photonic antenna (APhA) designed for 2.4 GHz communication in downlink side is proposed. The APhA consists of photodiode, RF amplifier and band pass filter (BPF) in small package, integrated with RF antenna. The APhA design is simulated using optical communication simulation software at varied fiber length and free space loss (FSL). Performance improvement over passive photonic antenna (PPhA) in term of signal power, SNR, constellation diagram, and BER is achieved, especially at PPhA service boundary.","PeriodicalId":329128,"journal":{"name":"2008 IEEE International RF and Microwave Conference","volume":"23 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":"121050621","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}
Pub Date : 2008-12-01DOI: 10.1109/RFM.2008.4897367
L. Abdulrazak, Z. Shamsan, A. Aswad, T. Rahman
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.
{"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}
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