1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363)最新文献

Performance of fixed wireless access WCDMA system with space diversity and power control 具有空间分集和功率控制的WCDMA固定无线接入系统的性能

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.780608

M. Tarkiainen, H. Lilja, J. Vikstedt, Jinlong Zhang

引用次数: 2

The performance of multi-carrier CDMA in cellular overlay systems 多载波CDMA在蜂窝覆盖系统中的性能研究

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.780501

B.J. Rainbolt, S. Miller

引用次数: 1

Measurements of the spatio-temporal polarization characteristics of a radio channel at 1800 MHz 1800mhz无线信道时空极化特性的测量

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778083

M. Nilsson, B. Lindmark, M. Ahlberg, M. Larsson, C. Beckman

引用次数: 21

A dynamic channel assignment method for voice packet transmission cellular system 一种用于话音分组传输蜂窝系统的动态信道分配方法

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778533

T. Uehara, T. Seto, Y. Akaiwa

引用次数: 5

1.6 Mbit/sec high capacity land mobile transmission characteristics of differential coding CDMA over multi-ray Rayleigh fading channel 差分编码CDMA在多射线瑞利衰落信道上1.6 Mbit/s高容量陆地移动传输特性

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778486

M. Shamoto, M. Ohba, K. Yin, M. Kishi

{"title":"1.6 Mbit/sec high capacity land mobile transmission characteristics of differential coding CDMA over multi-ray Rayleigh fading channel","authors":"M. Shamoto, M. Ohba, K. Yin, M. Kishi","doi":"10.1109/VETEC.1999.778486","DOIUrl":"https://doi.org/10.1109/VETEC.1999.778486","url":null,"abstract":"Differential coding CDMA (diffCDMA) is verified to conquer the fatal transmission error when communications are carried from high speed vehicles running through an urban environment with rapid multi-ray Rayleigh channels. With the introduction of differential coding into the primary modulation and employing analytic receiving for primary differential demodulation, the proposed diffCDMA system improves the transmission characteristics of similar CDMA systems such as IS-95 and WcdmaOne IMT2000 for mobile communications at vehicle speeds of more than 100 mile/h mobiles even if a multi-ray environment. Previously, differential coding primary modulation has not been considered for use with CDMA owing to the strict sense synchronization required in demodulation, which suffered from bit error under such rapid multi-ray Rayleigh fading. However, its use is now possible in high speed and high capacity transmission since analytic receiving is being adopted into CDMA systems. In the demodulation procedure of the diffCDMA, the received waves are first detected after multi-ray propagation with certain inevitable errors both in phase and frequency of the recovered carrier for the pseudo synchronization primary demodulation during analytic receiving.","PeriodicalId":290531,"journal":{"name":"1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123585460","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

An algorithm for reducing the peak to average power ratio is a multicarrier communications system 一种降低多载波通信系统峰值平均功率比的算法

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778247

V. Tarokh, H. Jafarkhani

{"title":"An algorithm for reducing the peak to average power ratio is a multicarrier communications system","authors":"V. Tarokh, H. Jafarkhani","doi":"10.1109/VETEC.1999.778247","DOIUrl":"https://doi.org/10.1109/VETEC.1999.778247","url":null,"abstract":"One of the main implementation disadvantages of a multicarrier communication system is the possibly high peak to average power ratio of the transmitted signals. One proposed solution is given by Jones and Wilkinson (see IEEE 46th Vehicular Technology Conference, Atlanta, p.904-8, 1996). It is based on applying a specific phase shift (not dependent on the codeword) to each dimension of the transmitted codewords. These phase shifts are known both to the transmitter and the receiver. Thus the phase shifts can be compensated for in the receiver without changing the distance properties of the code. Therefore, neither the rate nor the code performance is sacrificed. The phases need only once he computed off-line and the complexity of the system does not increase. Our contribution is to provide an algorithm to compute the phases that minimize the maximum peak to average power ratio taken over all possible transmitted signals. The new algorithm enables us to apply the Jones-Wilkinson method to various medium length as well as long codes of practical interest, a computational task for which no solution was known before. We apply our algorithm to some of the codes adapted for use in the physical layer of future wireless local area networks by the ETSI BRAN Hiperlan-II standardization committee. We report the computed reductions in peak to average power ratio.","PeriodicalId":290531,"journal":{"name":"1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125415510","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: 7

Burst synchronization on unknown frequency selective channels with co-channel interference using an antenna array 利用天线阵列对具有同信道干扰的未知频率选择信道进行突发同步

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778494

D. Astely, Andreas Jakobsson, A. L. Swindlehurst

引用次数: 20

Field test results of downlink smart antennas and power control for IS-136 IS-136下行智能天线和功率控制的现场测试结果

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778096

C.C. Martin, N. Sollenberger, J. Winters

{"title":"Field test results of downlink smart antennas and power control for IS-136","authors":"C.C. Martin, N. Sollenberger, J. Winters","doi":"10.1109/VETEC.1999.778096","DOIUrl":"https://doi.org/10.1109/VETEC.1999.778096","url":null,"abstract":"We present field test results obtained from our IS-136 smart antenna test bed showing the improvement in performance obtained using downlink smart antennas and power control for IS-136. We describe the test bed which consists of an adaptive uplink system with dual polarization antennas and a downlink multibeam antenna with power control. Tests were conducted at 1900 MHz on drive routes in a typical cellular base station site located in a suburban environment. We implemented and tested the performance of downlink power control algorithms which slowly adjust the transmit power based on the downlink or uplink RSSI while adaptively adjusting the RSSI threshold based on the BER. The field test results show that our beamforming technique with a fixed multibeam antenna with power control provides additional gain and can closely track channel variations thereby requiring less margin and less average transmit power while maintaining the C/I level needed for good signal quality. We show that power control improves the C/I by 2 to 3 dB for a 1% BER for both vehicular and pedestrian fade rates when the uplink RSSI is used to estimate the downlink received power. The field test demonstrates the feasibility of using smart antennas on the uplink and downlink to increase both the range and capacity of the IS-136 system.","PeriodicalId":290531,"journal":{"name":"1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126830047","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: 15

Performance of GPRS MAC protocol in dynamic TDD mode 动态TDD模式下GPRS MAC协议性能研究

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778071

Chiung-Shien Wu, R. Cheng

引用次数: 0

Adaptive permission probability control for request access in receiver-oriented DS/CDMA systems 面向接收机的DS/CDMA系统中请求访问的自适应许可概率控制

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363) Pub Date : 1999-05-16 DOI: 10.1109/VETEC.1999.778528

J. Park, Y. Choi

引用次数: 0