CDMA移動衛(wèi)星通信系統(tǒng)容量的計算
THE CAPACITY CALCULATION FOR CDMA MOBILE SATELLITE COMMUNICATION SYSTEM
-
摘要: 本文在考慮了下行功率通量密度限制、遮蔽效應(yīng)、多個系統(tǒng)和相鄰波束同頻復(fù)用、采用話音激活和極化隔離技術(shù)的前提下,分別計算和分析了不同下行功率通量密度限制方式、不同信道擴頻帶寬和不同移動用戶接收系統(tǒng)品質(zhì)因數(shù)(G/T)條件下CDMA移動衛(wèi)星通信系統(tǒng)的容量,并與TDMA和FDMA的容量進行了比較,在最后給出了主要結(jié)論。
-
關(guān)鍵詞:
- CDMA; 系統(tǒng)容量; 干擾; 衛(wèi)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]張更新,李斌,蔡劍銘.低執(zhí)道衛(wèi)星通信系統(tǒng)體制和通信協(xié)議的研究:內(nèi)部研究報告.南京:通信工程學院,1995年3月.[9]呂海寰,蔡劍銘,甘仲民,陳久治.衛(wèi)星通信系統(tǒng)工程.北京:人民郵電出版社,1994年第二版,第8.2節(jié).[10]Gilhousen K S. Increased capacity using CDMA for mobile satellite communication. IEEE J. of SAC, 1990, SC-8(4): 503-514. -
計量
- 文章訪問數(shù): 2974
- HTML全文瀏覽量: 223
- PDF下載量: 536
- 被引次數(shù): 0
下載:
