英语翻译CDMAandOtherSpectrumSharingConceptsTherearethreemajortechniquesusedforraidofrequency(RF)spectrumutilization;(a)frequencydivisionmultipleaccess(FDMA),(b)timedicisionmultipleaccess(TDMA),and(c)codedivisionmultipleac

Question

英语翻译
CDMA and Other Spectrum Sharing Concepts
There are three major techniques used for raido frequency(RF) spectrum utilization;(a)frequency division multiple access(FDMA),(b)time dicision multiple access(TDMA),and (c)code division multiple access(CDMA).These concepts are illustrated in Figure16.1.
In Time Division Multiple Access(TDMA),within a given time frame a particular user is allowed to transmit within is given time slot.This technique is used in most of the second-generation digital mobile communication system is known as GSM,in USA as DAMPS and in Japanas MPT.
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One might question why the AMPS spectrum space is utilized for IS-95.The reason is simple.By using the current AMPS infrastructure,it is less expensive to overlay the CDMA over the current cells than to build a completely new system.This approach allows the deployment of the CDMA spread-spectrum technology in a more timely fashion.
IS-95 defines a variety of operations for the air interface.As just stated,it describes the operations for a CDMA-AMPS,dual-mode mobile station.This station is expected to operate in accordance with the AMPS specification published as EIA/TIA-553 as well as the D-AMPS specification published as EIA/TIA IS-54-B.Additionally,the mobile station analog operation should be able to support the TIA/EIA IS-91 specification.The rule hold true also for the base station operations.

Answer 1

分享概念的CDMA和其他光谱
There是用于raido频率(RF)光谱运用的三个主要技术; (a)频率分割的多存取(FDMA), (b)时间dicision多存取(TDMA)和(c)代码区分多存取(CDMA).这些概念在Figure16.1被说明. 在一个特殊用户允许传送内的特定时间表之内给In时间分隔多路存取(TDMA)时隙.这个技术用于大多数第二代数字式移动式通信系统叫作GSM,在美国阻止和在Japanas MPT.
CADMA不划分时间光谱亦不频率光谱成片断.在代码区分Miltiple Acess (CDMA)每名用户使用一个分明代码,以便它同时占领相同频率带宽与其他用户和可以根据代码之间的低交互作用仍然被分离.象IS-95的这些系统在美国也被开发,并且规范化在移动式通信systems.CDMA systemd之内的第二代在一个多孔的网络之内的能提供高容量,并且他们为此变得越来越有吸引力.在定义第三代过程中移动式通信系统TDMA和CDMA仍然依然是主要敌手多存取技术.这申请两个,土地和卫星通讯.