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.2003.1321491
C. Dermawan, A. Sugiura
IP telephones using wireless LAN only communicate with other terminal through IP addresses on one's area network or access point area (cell). When a terminal moves from a certain cell to another cell, handover occurs because the terminal can not use the same IP address. On the other hand, by using Bluetooth, communication between terminals can be performed through IP address and Bluetooth addresses. Even if a terminal moves to another cell, the Bluetooth address can be used without a break in the communication.
{"title":"Wireless IP phone using Bluetooth for ITS application","authors":"C. Dermawan, A. Sugiura","doi":"10.1109/WCT.2003.1321491","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321491","url":null,"abstract":"IP telephones using wireless LAN only communicate with other terminal through IP addresses on one's area network or access point area (cell). When a terminal moves from a certain cell to another cell, handover occurs because the terminal can not use the same IP address. On the other hand, by using Bluetooth, communication between terminals can be performed through IP address and Bluetooth addresses. Even if a terminal moves to another cell, the Bluetooth address can be used without a break in the communication.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"349 1","pages":"204-205"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75139310","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.2003.1321602
Hitoshi Ishida, Kiyomichi Araki
To realize a band pass filter (BPF) in ultra-wide band (UWB) communications, a device using a ring resonator with a stub is investigated. A new proposal is made to control the frequency of the attenuation poles using both the ring and the stub impedance. A five stage wide-band BPF is fabricated in this manner. Its center frequency and bandwidth are calculated based on the ring resonator model. The circuit conditions for obtaining two attenuation poles at either side of the pass band are given, together with a method for controlling them.
{"title":"Design and analysis of UWB band pass filter","authors":"Hitoshi Ishida, Kiyomichi Araki","doi":"10.1109/WCT.2003.1321602","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321602","url":null,"abstract":"To realize a band pass filter (BPF) in ultra-wide band (UWB) communications, a device using a ring resonator with a stub is investigated. A new proposal is made to control the frequency of the attenuation poles using both the ring and the stub impedance. A five stage wide-band BPF is fabricated in this manner. Its center frequency and bandwidth are calculated based on the ring resonator model. The circuit conditions for obtaining two attenuation poles at either side of the pass band are given, together with a method for controlling them.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"17 1","pages":"457-458"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74667554","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.2003.1321445
J. Kim, Hoon Huh
Summary form only given. In a code division multiple access (CDMA) system, multiple access interference (MAI) coupled with the near-far problem is one of the major factors limiting system performance. To overcome these issues, various multiuser detection schemes have been proposed. The complexity of the multiuser detection schemes is important, especially when they are adopted in a multicarrier DS/CDMA system which employs lots of subcarriers. Successive interference cancellation (SIC) is relatively simpler than other multiuser detection schemes when used in a multicarrier CDMA system because it does not require separate channel estimation for each of the subcarriers. A SIC scheme based on order statistics is proposed and analyzed for a multicarrier CDMA system over a Rayleigh fading channel. The SIC scheme is employed for each subcarrier, and the subcarrier signals, after interference cancellation, are combined through maximal-ratio or equal-gain combining techniques. The effect of imperfect interference cancellation is also investigated. From the numerical results, it is shown that the proposed system achieves significant performance improvement over a conventional multicarrier CDMA system. The proposed system is robust to MAI and the near-far problem, which translates to a significant increase in system capacity.
{"title":"MAI mitigation by SIC for a multicarrier CDMA system","authors":"J. Kim, Hoon Huh","doi":"10.1109/WCT.2003.1321445","DOIUrl":"https://doi.org/10.1109/WCT.2003.1321445","url":null,"abstract":"Summary form only given. In a code division multiple access (CDMA) system, multiple access interference (MAI) coupled with the near-far problem is one of the major factors limiting system performance. To overcome these issues, various multiuser detection schemes have been proposed. The complexity of the multiuser detection schemes is important, especially when they are adopted in a multicarrier DS/CDMA system which employs lots of subcarriers. Successive interference cancellation (SIC) is relatively simpler than other multiuser detection schemes when used in a multicarrier CDMA system because it does not require separate channel estimation for each of the subcarriers. A SIC scheme based on order statistics is proposed and analyzed for a multicarrier CDMA system over a Rayleigh fading channel. The SIC scheme is employed for each subcarrier, and the subcarrier signals, after interference cancellation, are combined through maximal-ratio or equal-gain combining techniques. The effect of imperfect interference cancellation is also investigated. From the numerical results, it is shown that the proposed system achieves significant performance improvement over a conventional multicarrier CDMA system. The proposed system is robust to MAI and the near-far problem, which translates to a significant increase in system capacity.","PeriodicalId":6305,"journal":{"name":"2003 IEEE Topical Conference on Wireless Communication Technology","volume":"1 1","pages":"103-104"},"PeriodicalIF":0.0,"publicationDate":"2003-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75198903","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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