7-试题

序号试题内容1CDMA的关键技术包括『____』、『____』、『____』2在CDMA系统中，为克服无线的多径传输，采用的关键技术是（ ）。

In the CDMA system, in order to overcome the multipath transmission of radio, the key technologies adopted are ( ).3CDMA-1X中补充信道的作用是（ ）。

The functions of the supplementary channel in the CDMA-1X are ( ).4承载高速分组数据业务的信道是（ ）。

The channel for carrying the high-speed packet data service is ( ).5CDMA中短码的作用是（ ）。

The function of the short code in the CDMA is ( ).6在cdma20001x系统中，导频信道使用（ ）来扩频。

In the cdma20001x system, the pilot channel uses ( ) for spreading.7在cdma20001x系统中，同步信道使用（ ）来扩频。

In the cdma20001x system, the synchronization channel uses ( ) for spreading.8CDMA中Walsh码的作用是（ ）。

The function of the Walsh code in the CDMA is ( ).9CDMA系统中移动台显示的时间从（ ）获取。

In the CDMA system, the time displayed on the MS is obtained from ( ).10cdma2000 1X的WALSH码长是（ ）位。

The length of the WALSH code in the cdma2000 1X is ( ) bits.11IS95使用的WALSH码是（ ）阶。

The WALSH code used in IS95 is ( )-orders.12cdma2000 1X使用的WALSH码是（ ）阶。

The WALSH code used in cdma2000 1X is ( )-orders.13CDMA中短码的码长是（ ）位。

The length of the short code in CDMA is ( ) bits.14CDMA系统功率控制子信道插入在前向（ ）中。

The power control sub-channel of the CDMA system is inserted into the forward ( ).15多个直放站共用一个施主基站时，该施主基站最多能带多少直放站主要取决于（ ）。

When multiple repeaters share one donor BTS, the number of repeaters that can be carried by the donor BTS primarily depends on ( ).16直放站扩展了施主基站的覆盖范围，使施主基站所支持的话务量增加，同时直放站也导致施主基站覆盖区内移动台的发射功率（ ）。

The repeater expands the coverage of the donor BTS, and increases the traffic supported by the donor BTS. The repeater makes the transmitting power of the MS in the donor BTS coverage area ( ).17直放站扩展了施主基站的覆盖范围，使施主基站所支持的话务量增加，同时直放站也导致施主基站的覆盖半径（ ）。

The repeater expands the coverage of the donor BTS, and increases the traffic supported by the donor BTS. The repeater makes the coverage radius of the donor BTS ( ).18CDMA直放站施主天线与重发天线的隔离不好，就会引起直放站系统的自激。

实践中在直放站增益和隔离度之间一般要求有（ ）的余量。

If the CDMA repeater donor BTS is poorly isolated from the retransmission antenna, the self activation of the repeater system will occur. In the practice, a margin of ( ) should be reserved between the repeater gain and the isolation.19在FDMA、TDMA和CDMA三种多址接入方式中，『____』20cdma20001x每个扇区的基本载频中至少包含『____』21基站在『____』信道发送信息提供移动台建立与系统22基站在『____』信道发送信号供移动台识别基站并引23基站在『____』信道向移动台发送有关寻呼、指令以24『____』信道传送前向通信数据及信令。

The 『___ 25『____』信道传送反向通信数据及信令。

The  26业务信道被不同的用户占用时，这些用户由『____』27每个寻呼信道可以与高达 32 个『____』信道配合。

28移动台使用『____』个接收单元(Finger)，基站使用29寻呼信道的WALSH 码是『____』。

The WALSH codes30香农信道容量公式指出：如果信息传输速率C不变，则带宽W和信噪比P/N是可以互换的。

The Shannon channel capacity formula shows that: With information transmission rate C unchanged, the bandwidth W and signal-noise ratio P/N can be reciprocated.31目前3G标准采纳的三种空中接口标准为 WCDMA、CDMA2000、TD-SCDMA。

Currently, the 3G standard adopts threeair interface standards: WCDMA, CDMA2000 and TD-SCDMA.32香农信道容量公式指出：当信号低于噪声时，不可以进行可靠的通信。

The Shannon channel capacity formula indicates that: When the signal is lower than the noise, reliable communication is not possible.33工程中常用的7/8”馈线，工作频率越高，波长越短，损耗越小。

The 7/8” feeder is often used in engineering. The higher the working frequency, the shorter the wavelength, and the less the loss of the feeder.34GPS天线（通常称之为蘑菇头）为有源天线，内部有放大电路，需要外部供电。

The GPS antenna (generally referred to as “mushroom head) is an active antenna with amplification circuits35A2接口用于支持当移动台处于控制在业务信道状态时所发生的BSS之间的软切换，A2接口被划分成两部分：A2信令接口和A2业务接口。

The A2 interface is used for supporting the soft handoff between BSSs that occurs when the MS is in the traffic channel status. The A2 interface is divided into two parts: A2 signaling interface and A2 service interface.36F-CACH为前向公共功率控制信道。

The F-CACH is forward pubblic power control channel.37同一BTS内不同扇区相同载频之间的切换，我们称之为半软切换。

The handoff between peer carriers of different sectors in the BTS is called semi soft handoff.38CDMA系统的容量主要受限于系统内移动台的相互干扰，所以如果每个移动台的信号到达基站时都达到所需的最小信噪比，系统容量将会达到最大值。

The capacity of the CDMA system is primarily limited by the mutual interference between MSs in the system. Therefore, if the required minimum signal-to-noise ratio is reached when the signals of each MS arrive at the BTS, the system39SCCP为BSSAP应用提供两类业务：0类基本面向连接类，2类基本无连接类。

The SCCP provides two types of servicesfor BSSAP application: Category 0 connection-oriented service, and category 2 non-connection service.40MTP3从功能分为两个基本功能：信令消息处理功能和信令网络管理功能。

The MTP3 provides two basic functions: Signaling message processing function and signaling network management function.41分布在CPM上的软件模块有S_BSSAP、S_MTP3和S_MTP2。