WCDMA 導(dǎo)論[外文翻譯]

包含中文翻譯和英文原文，內(nèi)容詳細(xì)完整，建議下載參考！

中文： 5100字
英文： 15600字符

引言
本章介紹WCDMA 空中接口的基本原理，并且特別關(guān)注那些與GSM 和IS-95 不同的特
性。3.2 節(jié)介紹WCDMA 物理層的主要參數(shù)。3.3 節(jié)介紹擴(kuò)頻和解擴(kuò)的概念，隨后在3.4 節(jié)中介紹多徑無線信道和Rake 接收機(jī)。其他一些WCDMA 空中接口的關(guān)鍵組成部分——功率控制、軟切換和更軟切換也將在本章中介紹。3.5 節(jié)闡述了功率控制的必要性及實(shí)現(xiàn)，3.6 節(jié)介紹軟切換和更軟切換。
3.2 WCDMA 主要參數(shù)概括
在本節(jié)中，我們將介紹WCDMA 的主要系統(tǒng)參數(shù)，并對(duì)其中的大多數(shù)參數(shù)做出簡要解釋。
表3-1 概括了有關(guān)WCDMA 空中接口的主要參數(shù)。在此我們主要突出一些表征WCDMA 特 ......



Introduction to WCDMA
Peter Muszynski and Harri Holma
3.1 Introduction
This chapter introduces the principles of the WCDMA air interface. Special attention is
drawn to those features by which WCDMA differs from GSM and IS-95. The main
parameters of the WCDMA physical layer are introduced in Section 3.2. The concept of
spreading and despreading is described in Section 3.3, followed by a presentation of the
multipath radio channel and Rake receiver in Section 3.4. Other key elements of the
WCDMA air interface discussed in this chapter are power control and soft and softer
handovers. The need for power control and its implementation are described in Section 3.5,
and soft and softer handover in Section 3.6.
3.2 Summary of the Main Parameters in WCDMA
We present the main system design parameters of WCDMA in this section and give brief
explanations for most of them. Table 3.1 summarises the main parameters related to the
WCDMA air interface. Here we highlight some of the items that characterise WCDMA.
_ WCDMA is a wideband Direct-Sequence Code Division Multiple Access (DS-CDMA)
system, i.e. user information bits are spread over ......