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Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)最新文献

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System capacity, latency, and power consumption in multihop-routed SS-CDMA wireless networks 多跳路由SS-CDMA无线网络中的系统容量、延迟和功耗
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709135
M. Ettus
{"title":"System capacity, latency, and power consumption in multihop-routed SS-CDMA wireless networks","authors":"M. Ettus","doi":"10.1109/RAWCON.1998.709135","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709135","url":null,"abstract":"Ad-hoc wireless networking presents challenges that are different from those of tethered networks in several significant ways. In addition to high error rates and constantly varying channels, mobile communication imposes new constraints, including limited energy supplies, and the need for portability. A system for wireless networking utilizing code division multiple access (CDMA), in conjunction with spread spectrum (SS) modulation is presented. By combining SS, automatic power control and local coordination, a \"collisionless,\" energy and spectrum efficient system can be created which is capable of simultaneously providing high bandwidth and low latency communications. A new routing method, minimum consumed energy routing is evaluated. This new method is shown to reduce latency by 75%, reduce power consumption by 15%, and avoid congestion, in comparison with minimum transmitted energy routing. A simulator, SSNetSim, was developed to simulate the performance of these networks. By taking into account factors such as station placement, traffic patterns, routing strategies, and path loss, network performance, in terms of SNR, throughput, latency, and power consumption, is computed.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134218779","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: 243
Transmission capacity of a broadband wireless radio link 宽带无线无线电链路的传输容量
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709158
J. Fernandes
{"title":"Transmission capacity of a broadband wireless radio link","authors":"J. Fernandes","doi":"10.1109/RAWCON.1998.709158","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709158","url":null,"abstract":"The transmission performance of a mobile/wireless broadband digital radio system, using the 60 GHz band, is evaluated for different antenna configurations in two indoor scenarios. It is shown that for the same equalization effort the maximum achievable carrier bit rate (CBR) strongly depends on the antenna configuration. A CBR of 40-50 Mbit/s in a medium size room and 20 Mbit/s in a large room using biconic horn antennas at the mobile terminal (MT) and at the base station transceiver (BST) is achievable, while this limit increases up to 100 Mbit/s when using two horn antennas located in the two narrower lateral walls of the room. Moreover, a simple method to estimate the maximum CBR based on the channel time dispersion is presented. Simulation results for several MT positions along the rooms are presented and discussed.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114365029","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
The application of low noise amplifiers in CDMA cellular and PCS systems for coverage and capacity enhancements 低噪声放大器在CDMA蜂窝和PCS系统中的应用，以增强覆盖和容量
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709166
S. Yang
{"title":"The application of low noise amplifiers in CDMA cellular and PCS systems for coverage and capacity enhancements","authors":"S. Yang","doi":"10.1109/RAWCON.1998.709166","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709166","url":null,"abstract":"The paper examines the use of low noise amplifiers (LNAs) as a technique to enhance reverse-link coverage and capacity in a CDMA wireless network. The reduction of system noise figure for a base station is accomplished by installing LNAs between the receive antenna and the radio. Using noise figure theory, the paper develops an analytical model for the SNR improvement. The SNR models are found to be functions of the reverse-link noise rise, which constitutes a measure of the reverse-link capacity limits. Since the CDMA system uses reverse-link power control, the improvement in SNR is manifested in the reduction of the mobile's transmit power. In terms of capacity, the reverse-link capacity of a CDMA base station with installed LNAs has not improved. However, the capacity of a neighboring base station (with no LNAs) has improved. This is because the mobile within the coverage area of a base station (with LNA) now transmits less power and contributes less loading to the neighboring base station (with no LNA).","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116198436","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
Statistical behavior and performance of adaptive antennas in multipath environments 多径环境下自适应天线的统计行为与性能
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709178
T. Pham
{"title":"Statistical behavior and performance of adaptive antennas in multipath environments","authors":"T. Pham","doi":"10.1109/RAWCON.1998.709178","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709178","url":null,"abstract":"Adaptive antennas can behave very differently in multipath and non-multipath environments. In this paper we study the behavior of adaptive antennas in multipath Rayleigh fading by investigating the statistical variation of the spatial signature of a signal incident upon an antenna array. A method for analyzing the multipath performance of adaptive antennas is presented. It can be shown that the antenna performance becomes less dependent on the angles of arrival (AOA) of the incident signals as their angular spreads and antenna element spacing increase. In general, antenna performance improves for increasing element spacing because fading reduction is more effective and interference suppression is possible even when the mean AOAs of desired and interfering signals coincide.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"293 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134123096","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
Spatio-temporal equalization for wireless communication 无线通信的时空均衡
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709162
J. Alspector, J. D. Norgand, J. Parish
{"title":"Spatio-temporal equalization for wireless communication","authors":"J. Alspector, J. D. Norgand, J. Parish","doi":"10.1109/RAWCON.1998.709162","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709162","url":null,"abstract":"Problems with standard cellular systems include limited bandwidth, susceptibility to interference and limits on the number of users per cell. Part of the bandwidth problem can be improved by adding adaptive equalization to standard wireless digital data links. Interference from other users and limitations on the number of users per cell are problems that can be ameliorated by adaptive beamforming antenna arrays. Both spatial (beamforming) and temporal (equalization) processing can be optimized jointly, thus providing better performance than either separately.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130567335","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
Low-cost, dual-band, handset antennas for LEOS communications 低成本，双频，手机天线，用于低空通信
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709175
J. Mclean, G. Crook, S. Mikuteit
{"title":"Low-cost, dual-band, handset antennas for LEOS communications","authors":"J. Mclean, G. Crook, S. Mikuteit","doi":"10.1109/RAWCON.1998.709175","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709175","url":null,"abstract":"A new, low-cost, mass-produceable, dual-band antenna design has been developed. One embodiment of the design provides passbands centered at 305 MHz (295-315 MHz) and 380 MHz (370-390 MHz) for use with the MUBLCOM (multiple-path beyond line-of-sight communications) LEOS (low Earth orbiting satellite) communications system. However, because the new design provides improved flexibility in the spacings of the two passbands, it may be used to provide passbands with smaller or larger spacings. Furthermore, the antenna is suitable for either printed circuit or coaxial realization, thus allowing for low-cost mass production.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128778286","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
Spiral inductor substrate loss modeling in silicon RF ICs 硅射频集成电路中螺旋电感衬底损耗建模
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709197
W. Kuhn, N. Yanduru
{"title":"Spiral inductor substrate loss modeling in silicon RF ICs","authors":"W. Kuhn, N. Yanduru","doi":"10.1109/RAWCON.1998.709197","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709197","url":null,"abstract":"Spiral inductors constructed in silicon IC technologies possess limited quality factors due to series resistive losses, and losses within the semiconducting substrate. A new model for the less understood substrate losses illustrates how these losses can be minimized, providing quality factor increases of up to 230 percent over un-optimized designs.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130123561","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: 54
Quick prototyping of flip chip assembly with MEMS MEMS倒装芯片组装的快速原型设计
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709194
R. Irwin, Wenge Zhang, K. Harsh, Y.C. Lee
{"title":"Quick prototyping of flip chip assembly with MEMS","authors":"R. Irwin, Wenge Zhang, K. Harsh, Y.C. Lee","doi":"10.1109/RAWCON.1998.709194","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709194","url":null,"abstract":"This paper describes a process to transfer microelectromechanical systems (MEMS) devices to a secondary substrate using flip-chip thermosonic bonding. A standard wire-bonding machine was used to place /spl sim/100-/spl mu/m bumps on unreleased MEMS chiplets. The bumped chiplet was then flip-chip bonded to a secondary substrate containing a microwave coplanar waveguide (CPW). After bonding, the entire assembly was run through the MEMS release process, after which the MEMS host substrate was removed. The thermosonic bonding was a very reliable prototyping tool with a 100% bonding yield. The transfer process can be used with any MEMS that can be wire bonded. The process can also be applied to a variety of applications.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129587497","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: 28
MAI cancellation by optimum single-user detection for DS/CDMA systems using random binary codes 基于随机二进制码的DS/CDMA系统最佳单用户检测的MAI消除
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709165
N. R. Patel, T. O’Farrell
{"title":"MAI cancellation by optimum single-user detection for DS/CDMA systems using random binary codes","authors":"N. R. Patel, T. O’Farrell","doi":"10.1109/RAWCON.1998.709165","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709165","url":null,"abstract":"The optimum single-user detector (OSD) for a DS/CDMA based communications system is investigated using random binary signature codes of length 32 and 64 chips. The BER performances are obtained by Monte-Carlo simulation for spectral efficiencies of 50% and 100%. Results show that the OSD performs significantly better than the matched filter detector (MFD) with a modest increase in complexity. It is also seen that noise enhancement is induced due to MAI cancellation which degrades the OSD performance.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129610929","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
Digital single side band with pilot symbol assisted modulation in mobile radio channels 移动无线电信道中带导频符号辅助调制的数字单边带
Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194) Pub Date : 1998-08-09 DOI: 10.1109/RAWCON.1998.709142
Seungwon Kim, L. Couch
{"title":"Digital single side band with pilot symbol assisted modulation in mobile radio channels","authors":"Seungwon Kim, L. Couch","doi":"10.1109/RAWCON.1998.709142","DOIUrl":"https://doi.org/10.1109/RAWCON.1998.709142","url":null,"abstract":"This paper presents the analysis of digital single side band (DSSB) modulation technique with pilot symbol assisted modulation (PSAM). As a measure of the difficulty of linearization, the dynamic range, defined as the ratio of maximum to minimum instantaneous powers is commonly used. DSSB modulation is shown to provide the much reduced dynamic range from 5.5 dB to 8.9 dB whereas the dynamic range of QPSK is infinite and the dynamic range of OQPSK is around 11 dB. With DSSB, therefore, we can adopt more efficient amplifier with much simplified linearizer design. Besides, the proposed DSSB system does not need very sharp cutoff filtering and only sloped filtering, such as a raised cosine filtering, can be used.","PeriodicalId":226788,"journal":{"name":"Proceedings RAWCON 98. 1998 IEEE Radio and Wireless Conference (Cat. No.98EX194)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127560588","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
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