資源塊 (LTE下行鏈路)

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資源塊(LTE下行鏈路)是LTE下行鏈路分配給用戶的最小單位。LTE下行鏈路能夠分配給用戶的資源包括頻域資源、時域資源和空域資源,即既有頻分復用,又有時分復用,還有空分復用。空域資源分配是通過MIMO實現的。資源塊(resource block)是包含了12個子載波(頻域)並且持續一個時隙slot(時域)的一個資源組合。一個時隙長0.5毫秒。[1]

在0.5毫秒(一個時隙)時間內,LTE下行鏈路能夠生成7個OFDM符號,每個符號佔據12個子載波。不過資源塊中OFDM符號的持續時間不完全相等,第一個OFDM符號的時間稍長(通過延長OFDM符號的循環前綴CP來實現)。資源塊由資源片(resource element)組成,資源片是1個子載波(頻域)並且持續一個時隙slot(時域)的資源組合。

兩個時隙組成一個1毫秒的子幀(subframe),10個子幀(subframe)組成一個10毫秒的幀(frame)。幀(frame)是時域資源的最大單位。

假設某個用戶的信息只佔用一個資源塊,LTE下行鏈路先將用戶信息數據包串並轉換成12路子數據流;每個子數據流用一個子載波進行調製,一共是12個子載波;調製過程重複7次,即產生7個OFDM符號。持續的時間是0.5毫秒;最後12路子載波承載的信息通過並串轉換,在空口發送出去。

參見[編輯]

註釋[編輯]

  1. ^ Stefania Sesia, Issam Toufik and Matthew Baker, LTE – The UMTS Long Term Evolution: From Theory to Practice, (John Wiley & Sons, Ltd.), 2009, ISBN 978-0-470-69716-0.

延伸閱讀[編輯]

  • Erik Dahlman, Stefan Parkvall, Johan Sköld "4G – LTE/LTE-Advanced for Mobile Broadband", Academic Press, 2011, ISBN 978-0-12-385489-6
  • Stefania Sesia, Issam Toufik, and Matthew Baker, "LTE – The UMTS Long Term Evolution – From Theory to Practice", Second Edition including Release 10 for LTE-Advanced, John Wiley & Sons, 2011, ISBN 978-0-470-66025-6
  • Chris Johnson, "LTE in BULLETS頁面存檔備份,存於互聯網檔案館)", CreateSpace, 2010, ISBN 978-1-4528-3464-1
  • Erik Dahlman, Stefan Parkvall, Johan Sköld, Per Beming, "3G Evolution – HSPA and LTE for Mobile Broadband", 2nd edition, Academic Press, 2008,ISBN 978-0-12-374538-5
  • Borko Furht, Syed A. Ahson, "Long Term Evolution: 3GPP LTE Radio And Cellular Technology", Crc Press, 2009, ISBN 978-1-4200-7210-5
  • F. Khan, "LTE for 4G Mobile Broadband – Air Interface Technologies and Performance", Cambridge University Press, 2009
  • Mustafa Ergen, "Mobile Broadband – Including WiMAX and LTE", Springer, NY, 2009
  • H. Ekström, A. Furuskär, J. Karlsson, M. Meyer, S. Parkvall, J. Torsner, and M. Wahlqvist, "Technical Solutions for the 3G Long-Term Evolution," IEEE Commun. Mag., vol. 44, no. 3, March 2006, pp. 38–45
  • E. Dahlman, H. Ekström, A. Furuskär, Y. Jading, J. Karlsson, M. Lundevall, and S. Parkvall, "The 3G Long-Term Evolution – Radio Interface Concepts and Performance Evaluation," IEEE Vehicular Technology Conference (VTC) 2006 Spring, Melbourne, Australia, May 2006
  • K. Fazel and S. Kaiser, Multi-Carrier and Spread Spectrum Systems: From OFDM and MC-CDMA to LTE and WiMAX, 2nd Edition, John Wiley & Sons, 2008, ISBN 978-0-470-99821-2
  • Agilent Technologies, "LTE and the Evolution to 4G Wireless: Design and Measurement Challenges頁面存檔備份,存於互聯網檔案館)", John Wiley & Sons, 2009 ISBN 978-0-470-68261-6
  • Sajal Kumar Das, John Wiley & Sons (April 2010): "Mobile Handset Design", ISBN 978-0-470-82467-2 .
  • Beaver, Paul, "What is TD-LTE?", RF&Microwave Designline, September 2011.
  • Samuel C. Yang, "OFDMA System Analysis and Design", Artech House, 2010, ISBN 978-1-60807-076-3

外部連結[編輯]

白皮書及其他技術信息[編輯]