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多波束GEO卫星通信中CDMA与FDMA的多址容量 被引量:3

Capacity of CDMA and FDMA for Multi-beam GEO Satellite Communications
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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。 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.
出处 《应用科学学报》 CAS CSCD 北大核心 2009年第1期24-28,共5页 Journal of Applied Sciences
基金 总装预先研究项目基金(No.11001040103)资助项目
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 multi-beam GEO satellite communication, CDMA, FDMA, power control error (PCE)
作者简介 郝谢东,博士生,研究方向:卫星通信、电磁频谱管理,E-mail:haoxiedong@163.com; 刘爱军,教授,博导,研究方向:卫星通信系统、抗干扰技术; 张邦宁,教授,博导,研究方向:卫星通信系统、抗干扰技术
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