Comparison of transmit array algorithms for code division multiple access downlinks operating in the frequency division duplexing mode

C. A. Jötten, M. Meurer, P. W. Baier
{"title":"Comparison of transmit array algorithms for code division multiple access downlinks operating in the frequency division duplexing mode","authors":"C. A. Jötten, M. Meurer, P. W. Baier","doi":"10.1109/PIMRC.2001.965255","DOIUrl":null,"url":null,"abstract":"It is expected that in the forthcoming 3/sup rd/ generation (3G) mobile radio systems the downlinks will have to support much higher data rates than the uplinks. A promising measure to enable high downlink data rates consists in improving the carrier-to-interference ratios at the mobile receivers by the utilization or adaptive mufti-element transmit antennas. However, for the efficient operation of such antennas information about the downlink radio channels is required at the base stations. In the case of the 3G partial standard time division(TD)-CDMA designated for the time division duplexing (TDD) radio frequency bands, such information-thanks to the reciprocity theorem-is readily available from the uplink channel estimators. However, the 3G partial standard W(wideband)-CDMA designated for the frequency division duplexing (FDD) radio frequency bands suffers from the inherent disadvantage that, due to the frequency difference between uplink and downlink, the results of the uplink channel estimation cannot be directly used as the channel information required for adjusting the multi-element transmit antennas. Nevertheless, as long as the frequency difference between uplink and downlink is not too large, approaches to an at least sub-optimum adjustment of the downlink transmit antennas based on uplink channel estimates exist. In the paper such approaches are presented and evaluated by simulations.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/PIMRC.2001.965255","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5

Abstract

It is expected that in the forthcoming 3/sup rd/ generation (3G) mobile radio systems the downlinks will have to support much higher data rates than the uplinks. A promising measure to enable high downlink data rates consists in improving the carrier-to-interference ratios at the mobile receivers by the utilization or adaptive mufti-element transmit antennas. However, for the efficient operation of such antennas information about the downlink radio channels is required at the base stations. In the case of the 3G partial standard time division(TD)-CDMA designated for the time division duplexing (TDD) radio frequency bands, such information-thanks to the reciprocity theorem-is readily available from the uplink channel estimators. However, the 3G partial standard W(wideband)-CDMA designated for the frequency division duplexing (FDD) radio frequency bands suffers from the inherent disadvantage that, due to the frequency difference between uplink and downlink, the results of the uplink channel estimation cannot be directly used as the channel information required for adjusting the multi-element transmit antennas. Nevertheless, as long as the frequency difference between uplink and downlink is not too large, approaches to an at least sub-optimum adjustment of the downlink transmit antennas based on uplink channel estimates exist. In the paper such approaches are presented and evaluated by simulations.
分频双工模式下码分多址下行链路发射阵列算法的比较
预计在即将到来的3G移动无线电系统中,下行链路必须支持比上行链路高得多的数据速率。实现高下行数据速率的一种有希望的措施是通过利用或自适应多单元发射天线来提高移动接收机的载波干扰比。然而,为了这种天线的有效操作,需要在基站上提供有关下行无线电信道的信息。在3G部分标准时分(TD)——指定为时分双工(TDD)无线电频段的cdma——的情况下,由于互易定理,这些信息很容易从上行信道估计器中获得。然而,指定用于频分双工(FDD)射频频段的3G部分标准W(宽带)-CDMA存在固有的缺点,即由于上行链路和下行链路之间的频率差异,上行链路信道估计的结果不能直接用作调整多元发射天线所需的信道信息。然而,只要上行链路和下行链路之间的频率差不是太大,就存在基于上行链路信道估计对下行链路发射天线进行至少次优调整的方法。本文介绍了这些方法,并通过仿真对其进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信