北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2007, Vol. 30 ›› Issue (2): 19-23.doi: 10.13190/jbupt.200702.19.zhangyh

• 论文 • 上一篇    下一篇

TDD/CDMA系统交叉时隙干扰的解决方案

张英海,王卫东,周 博,赵 晶   

  1. ( 北京邮电大学 信息与电子技术研究室,北京 100876 )
  • 收稿日期:2006-11-02 修回日期:1900-01-01 出版日期:2007-04-30 发布日期:2007-04-30
  • 通讯作者: 张英海

Research on Interference at Crossed Slot in TDD/CDMA Systems

ZHANG Ying-hai, WANG Wei-dong, ZHOU Bo, ZHAO Jing   

  1. (Information and Electronics Technology Lab, Beijing University of Posts and Telecommunications, Beijing 100876, China)
  • Received:2006-11-02 Revised:1900-01-01 Online:2007-04-30 Published:2007-04-30
  • Contact: ZHANG Ying-hai

摘要:

针对时分双工/码分多址(TDD/CDMA)系统在动态调整上下行时隙的分配时会产生严重的交叉时隙干扰问题,提出了一种基于隔离区域的移动台间干扰的解决方案。隔离区域由移动台接收到的导频信号差值确定,该隔离区域范围较小,从而交叉时隙容量较大。同时分析了交叉时隙基站间干扰,结果表明,由于基站间传输条件较好,不能完全克服基站间干扰。因此TDD/CDMA系统(如时分同步CDMA(TD-SCDMA))的动态调整上下行切换点技术仍然很难应用于实际系统中。

关键词: 时分双工/码分多址, 可变切换点, 交叉时隙干扰, 隔离区域

Abstract:

Time division duplex - code division multiple access(TDD/CDMA)system can flexibly allocate uplink and downlink to be adapted to the asymmetrical service in theory. However, diversified switching point will produce the inter-cell interference at crossed slot. In this paper, a new scheme is proposed which can be used to resolve the problem of inter-mobile station (MS) interference at crossed slot by setting the separate area. The separate area is determined by the difference of pilot signal received by the mobiles in the new scheme. Further more, the separate area is smaller than that in other schemes, so the coverage at crossed slot increases. The inter-base station (BS) interference at crossed slot is also analyzed in this paper. The numerical results illustrate that the inter-BS interference is much stronger due to the better transmission environment and the mobile system hardly resists the inter-BS interference. Therefore, it is difficult for the technology of diversified switching point to be applied in practical TDD/CDMA system, such as time division-synchronous code division multiple access (TD-SCDMA).

Key words: time division duplex - code division multiple access, diversified switching point, interference at crossed slot, separate area

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