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多波束GEO卫星通信中CDMA与FDMA的多址容量

郝谢东; 刘爱军; 张邦宁   

  1. 解放军理工大学通信工程学院，南京210007
  • 收稿日期:2008-04-24 修回日期:2008-10-21 出版日期:2009-01-25 发布日期:2009-01-25
  • 通信作者: 郝谢东

Capacity of CDMA and FDMA for Multi-beam GEO Satellite Communications

HAO Xie-dong; LIU Ai-jun; ZHANG Bang-ning   

  1. Institute of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, China
  • Received:2008-04-24 Revised:2008-10-21 Online:2009-01-25 Published:2009-01-25
  • Contact: HAO Xie-dong

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2455

被引次数

2

摘要： 从系统容量角度分析了多波束同步轨道(GEO)卫星移动通信系统的最优多址接入方式. 通过推导计算波束交叠、功率控制误差条件下的多波束GEO卫星通信CDMA系统的容量，并同CPM调制FDMA/TDMA系统进行对比，得到FDMA/TDMA更适合多波束GEO卫星移动通信的结论.

关键词: 多波束GEO卫星通信系统, CDMA容量, FDMA容量, 功率控制误差

Abstract: This paper studies capacity of CDMA or FDMA/TDMA for multi-beam geostationary earth orbit (GEO) satellite communication systems. Relation is derived between outage probability of the required SNR and the number
of users support at a given power control error (PCE) level and voice activity factor. An expression of capacity of multi-beam GEO CDMA system is then obtained. Numerical results show that capacity is sensitive to system
parameters such as PCE. Using power and continuous phase modulation (CPM), capacity of FDMA/TDMA system is obtained according to the spectral efficiency of CPM. Comparison between CDMA and FDMA/TDMA shows that
capacity of FDMA/TDMA system is larger than CDMA in multi-beam GEO systems.

Key words: multi-beam GEO satellite communication, CDMA, FDMA, power control error (PCE)

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