跳转到内容

资源块 (LTE下行链路)

添加链接
维基百科，自由的百科全书

资源块（LTE下行链路）是LTE下行链路分配给用户的最小单位。LTE下行链路能够分配给用户的资源包括频域资源、时域资源和空域资源，即既有频分复用，又有时分复用，还有空分复用。空域资源分配是通过MIMO实现的。资源块（resource block）是包含了12个子载波（频域）并且持续一个时隙slot（时域）的一个资源组合。一个时隙长0.5毫秒。[1]

在0.5毫秒（一个时隙）时间内，LTE下行链路能够生成7个OFDM符号，每个符号占据12个子载波。不过资源块中OFDM符号的持续时间不完全相等，第一个OFDM符号的时间稍长（通过延长OFDM符号的循环前缀CP来实现）。资源块由资源片（resource element）组成，资源片是1个子载波（频域）并且持续一个时隙slot（时域）的资源组合。

两个时隙组成一个1毫秒的子帧（subframe），10个子帧(subframe)组成一个10毫秒的帧(frame)。帧（frame）是时域资源的最大单位。

假设某个用户的信息只占用一个资源块，LTE下行链路先将用户信息数据包串并转换成12路子数据流；每个子数据流用一个子载波进行调制，一共是12个子载波；调制过程重复7次，即产生7个OFDM符号。持续的时间是0.5毫秒；最后12路子载波承载的信息通过并串转换，在空口发送出去。

參見

註釋

  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.

延伸阅读

  • 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 （页面存档备份，存于互联网档案馆）", 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（页面存档备份，存于互联网档案馆）", 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

白皮书及其他技术信息

检索自“https://zh.wikipedia.org/w/index.php?title=资源块_(LTE下行链路)&oldid=65690392”