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Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)最新文献

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Super resolution processing for smart antennas 智能天线的超分辨率处理
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030136
D. Kasilingam, Honglei Chen
{"title":"Super resolution processing for smart antennas","authors":"D. Kasilingam, Honglei Chen","doi":"10.1109/RAWCON.2002.1030136","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030136","url":null,"abstract":"Smart antenna technology has been used to improve the performance of wireless communication systems. In this paper frequency extrapolation is used for obtaining a high resolution capability for base station antenna arrays. A new algorithm based on the eigenvector decomposition is developed for adaptively resolving transmitters which are located close to each other. Initial simulations show that this technique performs as well as existing techniques for low signal to noise ratios. However, in high signal to noise environments, the proposed technique outperforms the existing algorithms.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"23 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125782878","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
A new radio resource management scheme for multiple video stream transmission 一种新的多视频流传输无线资源管理方案
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030111
R. Shinkuma, M. Okada, K. Tsukamoto, S. Komaki
{"title":"A new radio resource management scheme for multiple video stream transmission","authors":"R. Shinkuma, M. Okada, K. Tsukamoto, S. Komaki","doi":"10.1109/RAWCON.2002.1030111","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030111","url":null,"abstract":"We propose a new resource management scheme for multiple video stream transmission (digital TV and digital video) in a wireless environment, where document file and packetized voice are also transmitted. The proposed scheme performs an adaptive transmission and dynamic frequency resource assignment. It determines the transmission parameters, such as modulation format, FEC code rate and the number of time slots per frame, according to the error sensitivities, the required bit rates for the transmitted packets, and the channel state. We analyze the MSE performance of the decoded video and the bit error rate performance of the data traffic by computer simulation. The simulation results show that the proposed scheme gives much better performance than the conventional uniform resource assignment scheme. It is capable of improving the total QoS (quality of service) of two or more video streams and non-stream traffic with efficient radio resource utilization.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129968957","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
An overview of OFDM and related techniques towards development of future wireless multimedia communications 概述了OFDM及其对未来无线多媒体通信发展的相关技术
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030107
F. B. Frederiksen, R. Prasad
{"title":"An overview of OFDM and related techniques towards development of future wireless multimedia communications","authors":"F. B. Frederiksen, R. Prasad","doi":"10.1109/RAWCON.2002.1030107","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030107","url":null,"abstract":"In future wireless broadband communication systems, to meet demands, data rates are expected to exceed several Mbps. Consequently, the delay time of the delayed waves can typically become greater than the duration of one symbol and delay spread handling by traditional adaptive equalization is not an easy task. OFDM (orthogonal frequency division multiplexing) is a spectrum efficient kind of multicarrier transmission. Using OFDM-techniques makes it possible to reduce the effects of multipath fading and thus complex equalizers at the receiver side can be avoided. The principles, technology and limits of OFDM are introduced and discussed. Special attention is given to SNR-problems and to synchronization in time and frequency at the receiver. OFDM is a strong candidate for the future generation of wireless communications. The performance of an OFDM-based system is limited by the system speed and the synchronization-ability and also by the given antenna concept. Thus the required future communication performance is not obtained only by improvements of the OFDM-concept but also by advanced diversity techniques and adaptive antenna technology.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130683573","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: 84
WCDMA cross modulation effects and implications for receiver linearity requirements WCDMA交叉调制效应及其对接收机线性度要求的影响
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030106
N. Swanberg, J. Phelps, M. Recouly
{"title":"WCDMA cross modulation effects and implications for receiver linearity requirements","authors":"N. Swanberg, J. Phelps, M. Recouly","doi":"10.1109/RAWCON.2002.1030106","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030106","url":null,"abstract":"Cross modulation is an important effect in mobile handsets used in both CDMA and WCDMA systems. The full duplex operation of these systems requires that the transmitter and the receiver operate simultaneously. When a handset is operating at maximum distance from the base station within a given cell, the high transmitter output power necessary to communicate with the distant base station is in direct conflict with the receiver operating at maximum sensitivity. The transmitter leakage power through the duplexer is usually significantly higher than the desired signal channel through the first few elements of the receiver. As a result, the transmitter leakage becomes the dominating effect for nonlinearities for the first LNA (low noise amplifier) in the receiver chain. This paper focuses on the effects of cross modulation in a WCDMA system.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130778654","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: 12
A low cost and high performance bandpass filter on a ridge waveguide structure for 5 GHz U-NII band radio channel selection 基于山脊波导结构的低成本高性能带通滤波器，用于5 GHz U-NII波段无线电信道选择
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030121
Yuri Sinelnikov, Y. Oh, J. Kwon, H. Yun
{"title":"A low cost and high performance bandpass filter on a ridge waveguide structure for 5 GHz U-NII band radio channel selection","authors":"Yuri Sinelnikov, Y. Oh, J. Kwon, H. Yun","doi":"10.1109/RAWCON.2002.1030121","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030121","url":null,"abstract":"This paper presents a low cost and high performance evanescent-mode bandpass filter with 20 MHz channel passband for a 5 GHz U-NII band radio transceiver. The design combines the advantage of a ridge waveguide structure and rigorous electromagnetic models for the structure analysis and optimization for low cost fabrication. This filter is suitable for high volume production and provides 1.5-2.5 dB of insertion loss with a stopband attenuation of more than 65 dB up to 14 GHz.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133848255","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
Linearization of power amplifiers through injection of low-frequency second-order products 通过注入低频二阶积实现功率放大器的线性化
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030161
W. Jenkins, A. Khanifar
{"title":"Linearization of power amplifiers through injection of low-frequency second-order products","authors":"W. Jenkins, A. Khanifar","doi":"10.1109/RAWCON.2002.1030161","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030161","url":null,"abstract":"This paper reports on a new linearization technique that is applicable to high power amplifiers used with digitally modulated single- or multi-carrier signals. The analysis and simulation results demonstrate that substantial improvement in intermodulation distortion (ACPR and CLR) can be achieved with relatively small signal processing overhead and minimal added hardware complexity. This paper attempts to present the underlying concept by applying frequency domain analysis to an amplifier modeled by a truncated power series. The technique has been successfully applied to EDGE and QPSK-modulated carrier signals. Simulation and practical results are presented to demonstrate its effectiveness.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134070828","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
The study of MEMS millimeter wave phase shifter MEMS毫米波移相器的研究
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030170
F. Guo, Z. Lai, S.Z. Zhu, Z.Q. Zhu, R. Zhu, Y. Zheng, G. Yang, A.Z. Li
{"title":"The study of MEMS millimeter wave phase shifter","authors":"F. Guo, Z. Lai, S.Z. Zhu, Z.Q. Zhu, R. Zhu, Y. Zheng, G. Yang, A.Z. Li","doi":"10.1109/RAWCON.2002.1030170","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030170","url":null,"abstract":"Several designs of MEMS millimeter-wave phase shifters are presented. They consist of a coplanar waveguide (CPW) transmission line periodically loaded with 8/spl sim/32 metal bridges, functioning as capacitive switches. Every switching element consists of a thin metallic membrane actuated by applied bias. Remarkable phase shifter performances were observed. One MEMS phase shifter reached to 372/spl deg//3.5 mm under 20 V bias at 35 GHz, with an insertion loss (S/sub 21/) of about 4/spl sim/7 dB.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114699631","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
WCDMA STTD performance analysis with transmitter location optimization in indoor systems using ray-tracing technique 利用光线追踪技术优化室内系统发射机位置的WCDMA STTD性能分析
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-11-07 DOI: 10.1109/RAWCON.2002.1030133
K. Bae, Jing Jiang, W. Tranter, C. Anderson, T. Rappaport, Jian He, A. Verstak, L. Watson, Naren Ramakrishnan, C. Shaffer
{"title":"WCDMA STTD performance analysis with transmitter location optimization in indoor systems using ray-tracing technique","authors":"K. Bae, Jing Jiang, W. Tranter, C. Anderson, T. Rappaport, Jian He, A. Verstak, L. Watson, Naren Ramakrishnan, C. Shaffer","doi":"10.1109/RAWCON.2002.1030133","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030133","url":null,"abstract":"This paper presents the performance of space-time block coding based transmit diversity (STTD) in WCDMA on correlated fading channels and on unbalanced transmitted power. Then, based on the performance, transmitter location optimization in indoor environments is considered. Results indicate that the effective diversity order is retained even when high cross correlation exists and power imbalance exists between signals from different antennas. Also, a global optimization algorithm with the help of a ray tracer can find transmitter locations which are optimal (global optimum) in the sense of power coverage or overall BER in the area of interest.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127986901","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
RF MEMS and Si micromachining in high frequency applications 高频应用中的射频MEMS和硅微加工
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 2002-08-11 DOI: 10.1109/RAWCON.2002.1030168
D. Peroulis, A. Margomenos, L. Katehi
{"title":"RF MEMS and Si micromachining in high frequency applications","authors":"D. Peroulis, A. Margomenos, L. Katehi","doi":"10.1109/RAWCON.2002.1030168","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030168","url":null,"abstract":"RF MEMS and Si micromachining are key technologies in obtaining low-size, low-weight, and low-cost components for the coming generation of communications systems. These technologies allow both the development of high-performance microwave/millimeter-wave switches and switch-based tunable subsystems, as well as innovative and efficient architectures for interconnecting and packaging. The design of a low-voltage capacitive and a low-resistance DC-contact switch are discussed. We also focus on a broadband low-loss on-wafer packaging scheme developed for the capacitive MEMS switch.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131616900","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
RF MEMS switches for 3D-IC phased array antenna modules 用于3D-IC相控阵天线模块的RF MEMS开关
Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573) Pub Date : 1900-01-01 DOI: 10.1109/RAWCON.2002.1030169
Y.A. Wang, A.M. Ferendeci
{"title":"RF MEMS switches for 3D-IC phased array antenna modules","authors":"Y.A. Wang, A.M. Ferendeci","doi":"10.1109/RAWCON.2002.1030169","DOIUrl":"https://doi.org/10.1109/RAWCON.2002.1030169","url":null,"abstract":"This paper presents modeling, design, fabrication, and measurement of a novel shunt capacitive RF MEMS switch. The switches are processed on a polyimide substrate in an intermediate layer of a monolithically processed vertically interconnected 3D-IC phased array antenna module at X-band. The copper switches have a pull-down voltage of 12 V and life cycle of at least 10/sup 7/ actuations. The switches demonstrated less than 0.2 dB insertion loss and 11.5 to 17.1 dB isolation at X-band. Measurement results confirmed that the distributed modeling of the MEMS switches presented here improved the design of parallel-configured RF MEMS switches in phase shifters.","PeriodicalId":132092,"journal":{"name":"Proceedings RAWCON 2002. 2002 IEEE Radio and Wireless Conference (Cat. No.02EX573)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124575389","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
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