METHODS AND ARRANGEMENTS IN A WIRELESS COMMUNICATI

专利名称：METHODS AND ARRANGEMENTS IN A

WIRELESS COMMUNICATION SYSTEM FORPRODUCING SIGNAL STRUCTURE WITHCYCLIC PREFIX

发明人：LARSSON, Peter,SAHLIN, Henrik申请号：EP08767178.0申请日：20080613公开号：EP2286562A1公开日：20110223

摘要：The present invention relates to methods and arrangements in a wirelesscommunication system supporting cyclic-prefix insertion, using a symbol sequencecomprising a number of samples for transmission over a radio channel that enables thehandling of very large signal delay spreads. The symbol sequence is built up by a firstsymbol with CP and a second symbol with CP. The second symbol is a copy of the firstsymbol with the samples shifted in a way that makes the two adjacent symbols with CPmatch in regards to the sample order. The symbol sequence may also comprise a thirdsymbol with CP or more, where the third symbol is a copy of the second symbol and withthe samples shifted in analogy with the symbol shift described above. The resultingsymbol sequence will thus appear as an extended continuous symbol thanks to theprecise cyclic shift that matches adjacent symbols. This allows the receiver to place itsFFT window anywhere during the extended symbol, e.g. at the end of the symbolsequence thus making it possible to handle a delay spread longer than the CP duration.It also allows to place e.g. two FFT windows and to combine the extracted signal into one

SNR improved signal, while still handling a longer delay spread.

申请人：Telefonaktiebolaget L M Ericsson (publ)

地址：164 83 Stockholm SE

国籍：SE

代理机构：Kühn, Friedrich Heinrich

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