Symbian OS 及通讯技术术语全解

核心提示：technique.1. CDMA allows multiple frequencies to be used simultaneously (Spread Spectrum). The CDMA idea was originally developed for military use over 30 years

technique.

1. CDMA allows multiple frequencies to be used simultaneously (Spread Spectrum). The CDMA idea was originally developed for military use over 30 years ago.

2. The CDMA standards used for second-generation mobile telephony are the IS-95 standards championed by QUALCOMM.

"码分多路访问：一种数字无线电话传输技术。

1. CDMA 允许同时使用多个频率(扩展频谱)。CDMA 的概念最初是为军事用途开发的。

2. 用于第二代移动电话技术的CDMA 标准是由QUALCOMM支持的IS-95 标准。"

Cellular radio

The technology that has made large scale mobile telephony possible. Current cellular networks reuse the same radio frequencies by assigning them to cells far enough apart to reduce interference. A cell is the geographical area covered by one radio base station transmitting/receiving in the center. The size of each cell is determined by the terrain, transmission power, and forecasted number of users. Service coverage of a given area is based on an interlocking network of cells, called a cell system.

这项技术已经使大规模移动电话技术成为可能。当前的蜂窝网络通过将相同的无线电频率分配到远远分隔的小室来减少干扰，以重复使用这些频率。小室是由位于中心的无线电基站传输/接收所覆盖的地理区域。每个小室的大小由地形、发射功率和预测的用户数来确定。给定地区的服务覆盖范围基于小室的联锁网络(名为小室系统)。

Circuit-Switching

Means of creating a connection by setting up a dedicated end-to-end circuit, which remains open for the duration of the communication.

建立连接的方法— 通过设置一个在通信期间保持开放的专用的端对端电路。

CLDC

J2ME Connected Limited Device Configuration. The CLDC serves the market consisting of personal, mobile, connected information devices. This configuration includes some new classes designed specifically to fit the needs of small-footprint devices.

J2ME 连接有限设备配置。CLDC 为由个人移动连接信息设备组成的市场提供服务。这种配置包括一些专为满足小型设备的需求而设计的新类别。