CDMA和通讯网络

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 外文原文
CDMA AND COMMUNICATION NETWORKS
 The great attraction of CDMA (Code Division Multiple Access) technology from the beginning has been increased of extraordinary capacity improvement.
 Over narrowband multiple access wireless technologies. Simple models suggest that the capacity improvement may be more than 20 times that of the existing narrowband cellular standards, such as AMPS in North America,NMT in Scandinavia,TACS in the United Kingdom.Historically,the capacity was calculated using simple parameters.Reality,of course, is much more complicated than the idealized models. Real cell coverage areas are highly irregular, not the neat hexagons found in textbook models. Offered load is not spatially uniform, changes dramatically with time-of-day, and is often subject to other uncontrollable influences.

 外文资料翻译译文
CDMA和通讯网络
 CDMA(码分多址)技术最吸引人的地方从一开始就是它所带来的巨大的通信容量。
 它要远远优于窄带的无线通信技术。简单的模拟试验证明，相比于现存的窄带蜂窝标准，比如北美的AMPS、斯堪的那维亚半岛的NMT和英国的TACS，CDMA技术的通信容量可提高20倍以上。按照传统的方式，通信容量是用一些简单的参数计算出来的。尽管如此，它还是比理想的模型要复杂很多。实际的蜂窝小区覆盖的范围是高度不规则的，而不是texbook模型中规则的六边形。被提供的负荷也不是一成不变的，而是随着时间戏剧性的改变，这经常是由一些不能控制的因素来决定的。

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