頁籤選單縮合
題 名 | TD-SCDMA技術介紹=Introduction of 3GPP TD-SCDMA |
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作 者 | 簡鴻彥; 黃金石; 劉威廷; | 書刊名 | 電信研究 |
卷 期 | 35:1 2005.02[民94.02] |
頁 次 | 頁41-62 |
分類號 | 448.84 |
關鍵詞 | 劃時-同步劃碼多重進接; 第3代行動通信合夥計畫; 第3代行動通信系統; Time division synchronous CDMA; TD-SCDMA; Third-generation partnership project; 3GPP; Third-generation; 3G mobile communication system; LCR; Low chip rate; |
語 文 | 中文(Chinese) |
中文摘要 | 在WCDMA系統中,可採用劃頻雙工(FDD)或劃時雙工(TDD)兩種不同的雙工模式。其中,FDD模式以相隔190MHz的頻段區分上/下鏈路,而TDD模式則在同頻段上以時間區隔上/下鏈路。雖然業者於3G網路建置初期大致會先採用FDD模式,然而TDD模式具有不需成對頻段以及頻譜使用效率較為靈活的優點,可提供營運商另一種有效率的建置方案。TDD模式中包含兩種選擇系統:High Chip Rate(HCR)與Low Chip Rate(LCR)。HCR規格是由ETSI所提出,一般亦稱為UTRT TDD系統(或TD-CDMA),展頻碼速率(chip rate)為3.84 Mcps,LCR規格是由中國大陸所提出的TD-SCDMA,展頻碼速率為1.28 Mcps。本文將針對TD-SCDMA系統,介紹實體通道、基頻處理、展頻調變、相關的實體層處理程序以及TD-SCDMA的特點。 |
英文摘要 | There are two duplex modes in WCDMA system, namely, the frequency division duplex (FDD) and the time division duplex (TDD). In FDD mode, the uplink and downlink are separated by 190 MHz. However, the uplink and downlink use same frequency and are distinguished by time slot in TDD mode. In the beginning deployment stage of 3G networks, operators will adopt FDD mode to provide service, But TDD mode, which takes the advantages of the needless of paired-band and higher spectrum efficiency, will provide operator another choice of deployment solution. Currently, High Chip Rate (HCR) and Low Chip Rate (LCR) are two options in 3GPP TDD-mode. HCR was proposed by ETSI and known as UTRA TDD (or TD-CDMA). LCR is known as TD-SCDMA, and was proposed and pushed by china. This article will focus on LCR option (TD-SCDMA) and give an introduction to its physical channels, baseband processes, spreading/modulation, physical procedures and features. |
本系統中英文摘要資訊取自各篇刊載內容。