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应用科学学报 ›› 2003, Vol. 21 ›› Issue (4): 349-352.

• 论文 • 上一篇    下一篇

不同分集合并的CDMA系统在多径衰落信道下的容量分析

方昕1, 高西奇1, 尤肖虎1, Woogoo Park2   

  1. 1 东南大学移动通信国家重点实验室 江苏 南京 210096;
    2 中国北京移动研究中心 北京 100000
  • 收稿日期:2002-05-06 修回日期:2003-03-25 出版日期:2003-12-10 发布日期:2003-12-10
  • 作者简介:方昕(1975-),女,江苏盐城人,博士生;高西奇(1967-),男,安徽灵璧人,教授,博导;尤肖虎(1962-),男,江苏苏州人,教授,博导.
  • 基金资助:
    韩国电信科学研究院(ETRI)资助项目(8604001016)

Capacity Analysis of CDMA System with Different Combining Schemes Under Multipath Fading Channels

FANG Xin1, GAO Xi-qi1, YOU Xiao-hu1, Woogoo Park2   

  1. 1. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China;
    2. ETRI Beijing Research Center for Mobile, Beijing 100000, China
  • Received:2002-05-06 Revised:2003-03-25 Online:2003-12-10 Published:2003-12-10

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摘要： 主要推导了在多用户情况下,宽带CDMA系统在频率选择性衰落信道下的系统容量公式,并且导出了在获得加权容量最大时的最优功率分配公式.理论结果表明分配更多的系统资源给信道条件好的用户将导致更好的系统利用率以及更高的系统容量,分析和数值结果表明CDMA系统的容量随不同的分集合并方式,以及不同的优先级别而变化.最大比合并获得最大的系统容量.

关键词: 最优功率分配, CDMA系统, 香农容量

Abstract: In this paper, the capacity region of downlink DS CDMA system under frequency selective fading channels is derived. Closed form solution of the optimum resource allocation schemes for multi user is obtained assuming that the channel information is known by both transmitter and receiver. The equation shows that a nonuniform service distribution, which is obtained by allocating more resource to a better channel quality, leads to a higher capacity. Numerical results show that the capacity of CDMA system changes with different diversity combining schemes and different priorities. MRC has the best system capacity.

Key words: optimum power allocation, Shannon capacity, CDMA system

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