Pub Date : 2003-10-15DOI: 10.1109/WCT.2003.1321611
R. Ramiz
Wireless communication systems have developed well for the last ten years. Since EM fields are important for human health and electronic systems' safety, shielding materials are becoming of great interest. Different types of electromagnetic isolation materials have been developed. These are commonly based on copper, nickel, ferrite, etc., or their composites. However they are not optimum for public use due to their cost, installation conditions, advantages in daily life. A new material is proposed for electromagnetic shielding for public use. It is not only effective against the electromagnetic fields radiated from base station antennas, but also provides thermal isolation and sound attenuation in buildings. The proposed material is a 2 to 5 cm thick sandwich like panel whose substrate consists of a polyurethane or phenolic material, with both sides covered by smooth or embossed aluminium foil or polyester, with thickness of 28 /spl mu/m to 200 /spl mu/m. The effectiveness of the material has been measured using different indoor-outdoor antennas.
{"title":"Shielding material for public buildings against the electromagnetic field radiation of the base station antennas","authors":"R. Ramiz","doi":"10.1109/WCT.2003.1321611","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321611","url":null,"abstract":"Wireless communication systems have developed well for the last ten years. Since EM fields are important for human health and electronic systems' safety, shielding materials are becoming of great interest. Different types of electromagnetic isolation materials have been developed. These are commonly based on copper, nickel, ferrite, etc., or their composites. However they are not optimum for public use due to their cost, installation conditions, advantages in daily life. A new material is proposed for electromagnetic shielding for public use. It is not only effective against the electromagnetic fields radiated from base station antennas, but also provides thermal isolation and sound attenuation in buildings. The proposed material is a 2 to 5 cm thick sandwich like panel whose substrate consists of a polyurethane or phenolic material, with both sides covered by smooth or embossed aluminium foil or polyester, with thickness of 28 /spl mu/m to 200 /spl mu/m. The effectiveness of the material has been measured using different indoor-outdoor antennas.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"221 1","pages":"475-476"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79012182","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321521
Y. Lee, J. Yeo, R. Mittra, S. Ganguly, J. Tenbarge
In this paper we present two novel multiband antenna designs for multiple frequency applications. The first of these, which is based on fractal concepts, is a Sierpinski gasket type of fractal configuration, printed on a dielectric substrate backed by a ground plane. We propose a novel approach to enhancing its multiband performance, in terms of impedance matching characteristics as well as radiation patterns, at three operating frequencies. The second design combines a rectangular microstrip patch with a cylindrical dielectric resonator, and operates at multiple frequencies. Specifically, we describe a stacked configuration of a dielectric resonator antenna on a microstrip patch for three frequency bands. Circular polarization is obtained by utilizing four coaxial feeds in phase quadrature. This configuration is found to exhibit good cross-polarisation rejection characteristics.
{"title":"Fractal and multiband communication antennas","authors":"Y. Lee, J. Yeo, R. Mittra, S. Ganguly, J. Tenbarge","doi":"10.1109/WCT.2003.1321521","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321521","url":null,"abstract":"In this paper we present two novel multiband antenna designs for multiple frequency applications. The first of these, which is based on fractal concepts, is a Sierpinski gasket type of fractal configuration, printed on a dielectric substrate backed by a ground plane. We propose a novel approach to enhancing its multiband performance, in terms of impedance matching characteristics as well as radiation patterns, at three operating frequencies. The second design combines a rectangular microstrip patch with a cylindrical dielectric resonator, and operates at multiple frequencies. Specifically, we describe a stacked configuration of a dielectric resonator antenna on a microstrip patch for three frequency bands. Circular polarization is obtained by utilizing four coaxial feeds in phase quadrature. This configuration is found to exhibit good cross-polarisation rejection characteristics.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"112 1","pages":"273-274"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79714450","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321542
O. Miura, T. Shirosaki, S. Taniguchi, A. Kazama, U. Kimura, J. Hirokawa, M. Ando
A compact wireless terminal (WT) with a high gain planar array has been developed for the Wireless IP Access System (WIPAS), which is a point-to-multipoint FWA (fixed wireless access) system in 26 GHz frequency band. Drastic cost reduction and downsizing are realized by using an alternating phase fed single layer waveguide array antenna and MMIC (microwave monolithic IC) technologies. This terminal is 190/spl times/190/spl times/55 mm/sup 3/ in volume and less than 2.0 kg in weight which accommodates over 31 dBi very high efficiency antenna with radome, RF module, IF modules, ASIC (application specific IC) for modem, TDMA (time division multiple access) equipment control, and MAC (medium. access control). Only an Ethernet cable with 24 DC power supply is attached on the terminal. This paper describes the design of WT with the focus upon the unique antenna and RF module.
{"title":"A low-cost and very small wireless terminal integrated on the back of a flat panel array for 26 GHz band fixed wireless access systems","authors":"O. Miura, T. Shirosaki, S. Taniguchi, A. Kazama, U. Kimura, J. Hirokawa, M. Ando","doi":"10.1109/WCT.2003.1321542","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321542","url":null,"abstract":"A compact wireless terminal (WT) with a high gain planar array has been developed for the Wireless IP Access System (WIPAS), which is a point-to-multipoint FWA (fixed wireless access) system in 26 GHz frequency band. Drastic cost reduction and downsizing are realized by using an alternating phase fed single layer waveguide array antenna and MMIC (microwave monolithic IC) technologies. This terminal is 190/spl times/190/spl times/55 mm/sup 3/ in volume and less than 2.0 kg in weight which accommodates over 31 dBi very high efficiency antenna with radome, RF module, IF modules, ASIC (application specific IC) for modem, TDMA (time division multiple access) equipment control, and MAC (medium. access control). Only an Ethernet cable with 24 DC power supply is attached on the terminal. This paper describes the design of WT with the focus upon the unique antenna and RF module.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"7 1","pages":"325-326"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88398865","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321501
S. Raman
The corresponding explosive growth in wireless communications systems has led to an increased demand for wireless devices which are compact, low-cost, and low-power. To meet this demand, IC which combine RF, analog, and digital functions on the same chip are required, rapidly approaching system-on-chip (SoC) implementations.
{"title":"Towards wireless single chip systems: challenges for RF integration in SoC","authors":"S. Raman","doi":"10.1109/WCT.2003.1321501","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321501","url":null,"abstract":"The corresponding explosive growth in wireless communications systems has led to an increased demand for wireless devices which are compact, low-cost, and low-power. To meet this demand, IC which combine RF, analog, and digital functions on the same chip are required, rapidly approaching system-on-chip (SoC) implementations.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"41 1","pages":"224-226"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88849408","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321444
Li Zan, Tie Yi, J. Lijun, Chang Yilin, Cai Jueping
The paper suggests a kind of packet protocol for frequency-hopping networks based on chaotic non-periodic frequency-hopping (FH) sequences. The packet error and throughput performance of a frequency-hopping multi-access (FHMA) network are derived theoretically. It is shown that the ratio of the packet length to the frequency-hopping points is the key parameter to determining the FHMA system performance under the condition of a large number of users. Computer simulation results of the logistic chaotic sequences are also included to support our development.
{"title":"Analysis of FHMA performance based on non-period chaotic frequency hopping sequences","authors":"Li Zan, Tie Yi, J. Lijun, Chang Yilin, Cai Jueping","doi":"10.1109/WCT.2003.1321444","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321444","url":null,"abstract":"The paper suggests a kind of packet protocol for frequency-hopping networks based on chaotic non-periodic frequency-hopping (FH) sequences. The packet error and throughput performance of a frequency-hopping multi-access (FHMA) network are derived theoretically. It is shown that the ratio of the packet length to the frequency-hopping points is the key parameter to determining the FHMA system performance under the condition of a large number of users. Computer simulation results of the logistic chaotic sequences are also included to support our development.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"501 1","pages":"97-102"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77058592","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321566
F. Tseng, J. Venkataraman
The paper presents an adaptive technique for a mutually coupled array. It employs amplitude and phase optimization to create multiple nulls to suppress multiple jammers, and is based on forward/backward smoothed ESPRIT (estimation of signal parameters via rotational invariance technique). Both current amplitudes and phases are simultaneously adjusted to maximize the SIR (signal-to-interference ratio). To take account of mutual coupling, the self and mutual impedances of the array are computed.
{"title":"Optimization for adaptive antenna arrays with mutually coupled elements via spatially smoothed ESPRIT","authors":"F. Tseng, J. Venkataraman","doi":"10.1109/WCT.2003.1321566","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321566","url":null,"abstract":"The paper presents an adaptive technique for a mutually coupled array. It employs amplitude and phase optimization to create multiple nulls to suppress multiple jammers, and is based on forward/backward smoothed ESPRIT (estimation of signal parameters via rotational invariance technique). Both current amplitudes and phases are simultaneously adjusted to maximize the SIR (signal-to-interference ratio). To take account of mutual coupling, the self and mutual impedances of the array are computed.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"77 1","pages":"376-377"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87059469","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321582
J. Choi, Y. Akaiwa
In cellular mobile communication systems, co-channel interference and fading degrade the transmission performance. The adaptive array antenna (AAA) with a wide antenna element spacing, placed only at the base station (BS), has been studied to cope with co-channel interference and multipath fading. When signals are subjected to frequency selective fading, the AAA system cannot cope well with performance degradation due to intersymbol interference. In order to cope with this problem, we extend the system by introducing a decision feedback equalizer at the mobile station.
{"title":"Performance of a base station feedback-type adaptive array antenna with decision feedback equalizer at mobile station","authors":"J. Choi, Y. Akaiwa","doi":"10.1109/WCT.2003.1321582","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321582","url":null,"abstract":"In cellular mobile communication systems, co-channel interference and fading degrade the transmission performance. The adaptive array antenna (AAA) with a wide antenna element spacing, placed only at the base station (BS), has been studied to cope with co-channel interference and multipath fading. When signals are subjected to frequency selective fading, the AAA system cannot cope well with performance degradation due to intersymbol interference. In order to cope with this problem, we extend the system by introducing a decision feedback equalizer at the mobile station.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"4 1","pages":"410-411"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87288587","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321418
C. Hewes
Summary form only given. Wireless communications technology has gone through very rapid evolution in recent years. Perhaps the most dramatic change is seen is chip sets for cellular phones. In just a few years, the silicon die area to support a GSM cellular digital base band function has shrunk by a factor of 19 which, along with silicon wafer size increase, has resulted in a 60-fold increase in the number of silicon die per wafer. The chip set solutions for cellular phones have changed from several chips and hundreds of external passive components to just three chips and about 50 external components for a GSM GPRS device today. A single chip implementation of GPRS is expected soon. Besides the current state of the art in SOC, two R&D projects at Texas Instruments illustrate the scope and nature of the R&D work for future wireless communications: multi-antenna MIMO (multi-input, multi output) system for future wireless LANs and a UWB (ultra wide band) effort.
{"title":"SOC technology for future wireless communications","authors":"C. Hewes","doi":"10.1109/WCT.2003.1321418","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321418","url":null,"abstract":"Summary form only given. Wireless communications technology has gone through very rapid evolution in recent years. Perhaps the most dramatic change is seen is chip sets for cellular phones. In just a few years, the silicon die area to support a GSM cellular digital base band function has shrunk by a factor of 19 which, along with silicon wafer size increase, has resulted in a 60-fold increase in the number of silicon die per wafer. The chip set solutions for cellular phones have changed from several chips and hundreds of external passive components to just three chips and about 50 external components for a GSM GPRS device today. A single chip implementation of GPRS is expected soon. Besides the current state of the art in SOC, two R&D projects at Texas Instruments illustrate the scope and nature of the R&D work for future wireless communications: multi-antenna MIMO (multi-input, multi output) system for future wireless LANs and a UWB (ultra wide band) effort.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"19 1","pages":"7-"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89386291","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321519
M. Iskander, R. Isom, T. Heffner, Z. Yun, W. Milroy
Continuous transverse stub (CTS) is an antenna technology that offers greater tunable bandwidth than waveguide or patch antennas, efficiencies of over 60% and polarization isolation of 25-50 dB. This technology is also low cost, relatively insensitive to fabrication tolerance, and when combined with the ferroelectric material technology, it provides beam steering capability. For wireless communications applications, omnidirectional radiation patterns and improved feeding arrangements may also be required to further simplify the design and improve the impedance matching characteristics. To this end, we recently designed a coaxial version of the CTS technology, and experimentally verified its radiation and impedance characteristics.
{"title":"Design of a multi-band antenna array using CTS and photonic band gap technologies","authors":"M. Iskander, R. Isom, T. Heffner, Z. Yun, W. Milroy","doi":"10.1109/WCT.2003.1321519","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321519","url":null,"abstract":"Continuous transverse stub (CTS) is an antenna technology that offers greater tunable bandwidth than waveguide or patch antennas, efficiencies of over 60% and polarization isolation of 25-50 dB. This technology is also low cost, relatively insensitive to fabrication tolerance, and when combined with the ferroelectric material technology, it provides beam steering capability. For wireless communications applications, omnidirectional radiation patterns and improved feeding arrangements may also be required to further simplify the design and improve the impedance matching characteristics. To this end, we recently designed a coaxial version of the CTS technology, and experimentally verified its radiation and impedance characteristics.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"39 1","pages":"269-270"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89656218","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 : 2003-10-15DOI: 10.1109/WCT.2003.1321535
Y. Shoji, K. Hamaguchi, H. Ogawa, A. Akeyama, Y. Shiraki, K. Yoshida, T. Hirose, H. Shimawaki, K. Sakamoto
We present an overview of the millimeter-wave ad-hoc wireless access systems that we are developing. These systems have the advantages of easy connectivity, network flexibility, and high-speed data transmission using a wide frequency bandwidth. This paper describes the concept of the system, and the hardware design.
{"title":"Millimeter-wave ad-hoc wireless access system. (1) System overview","authors":"Y. Shoji, K. Hamaguchi, H. Ogawa, A. Akeyama, Y. Shiraki, K. Yoshida, T. Hirose, H. Shimawaki, K. Sakamoto","doi":"10.1109/WCT.2003.1321535","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321535","url":null,"abstract":"We present an overview of the millimeter-wave ad-hoc wireless access systems that we are developing. These systems have the advantages of easy connectivity, network flexibility, and high-speed data transmission using a wide frequency bandwidth. This paper describes the concept of the system, and the hardware design.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"23 1","pages":"308-309"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87610200","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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