CDMA移动卫星通信系统容量的计算
THE CAPACITY CALCULATION FOR CDMA MOBILE SATELLITE COMMUNICATION SYSTEM
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摘要: 本文在考虑了下行功率通量密度限制、遮蔽效应、多个系统和相邻波束同频复用、采用话音激活和极化隔离技术的前提下,分别计算和分析了不同下行功率通量密度限制方式、不同信道扩频带宽和不同移动用户接收系统品质因数(G/T)条件下CDMA移动卫星通信系统的容量,并与TDMA和FDMA的容量进行了比较,在最后给出了主要结论。
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关键词:
- CDMA; 系统容量; 干扰; 卫星通信
Abstract: On the basis of considering downlink power flux density limit, shadowing effect, frequency reuse in different systems and adjoining spots of same system, adopting voice activity and polarization isolation techniques, the capacity of CDMA mobile satellite communication system at different downlink power flux density limit mode, channel spread bandwidth and mobile user s quality factor of receiving system (G/T) are analysed and calculated, and compared with the ones of TDMA and FDMA. Finally, the conclusions are given. -
Crawford T. Why CDMA should be the digital choice for cellular carriers. Telecommunications, 1993, 27(3): 49-51.[2]Vojcic B R, Pickholtz R L, Milstein L B. Performance of DS-CDMA with imperfect power control[3]operating over a low earth orbiting satellite link. IEEE J. of SAC, 1994, SAG12(4): 560-567.[4]Kohno R, Meidan R, Milstein L B. Spread spectrum access methods for wireless communications. IEEE Communications Magazine, 1995, 33(1): 58-67.[5]Magill D T, Natali F D, Edwards G P. Spread-spectrum technology for commercial applications.[6]Proc. IEEE, 1994, 82(4): 572-584.[7]Vojcic B R, Milstein L B, Pickholtz R L. Total capacity in a shared CDMA LEOs environment. IEEE J. of SAC, 1995, SAC-13(2): 232-244.[8]张更新,李斌,蔡剑铭.低执道卫星通信系统体制和通信协议的研究:内部研究报告.南京:通信工程学院,1995年3月.[9]吕海寰,蔡剑铭,甘仲民,陈久治.卫星通信系统工程.北京:人民邮电出版社,1994年第二版,第8.2节.[10]Gilhousen K S. Increased capacity using CDMA for mobile satellite communication. IEEE J. of SAC, 1990, SC-8(4): 503-514. -
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