移动通信 Mobile Communication

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译文
移动通信 Mobile Communication(中文6000字,英文4400字)
1.蜂窝电话系统
一个蜂窝电话系统可以为在该系统无线电收发范围内的任何用户提供一个到PSTN的无线电话连接。在一定的频谱内，蜂窝系统可以在一个大区域中拥有相当多的用户。蜂窝无线电系统常常可以提供比有线电话系统更高质量的服务。通过限制从每一个基站发射机到一个叫做蜂窝小区的范围来过得高容量，同一条无线电通道可以被其他远距离基站再次利用。当一个用户转移到另一个小区时，采用一种复杂的交换技术就可以使摘机状态的手机连续地进行呼叫处理。

外文翻译
Mobile Communication
1. Cellular Telephone Systems
A cellular telephone system provides a wireless connection to the PSTN for any user location within the radio range of the system. Cellular systems accommodate a large number of users over a large geographic area, within a limited frequency spectrum .Cellular radio systems provide high quality service that is often comparable to that of the landline telephone systems .High capacity is achieved by limiting the coverage of each base station transmitter to a small geographic area called a cell so that the same radio channels may be reused by another base station located some distance away. A sophisticated switching technique called a handoff enables a handoff enables a call to proceed uninterrupted when the user moves from one cell to another.