(19)
(11) EP 1 523 143 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
06.07.2005 Bulletin 2005/27

(43) Date of publication:
13.04.2005 Bulletin 2005/15

(21) Application number: 05000138.7

(22) Date of filing: 16.10.2003
(51) International Patent Classification (IPC)7: H04L 25/03, H04L 27/26
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.02.2003 JP 2003044519
08.11.2002 JP 2002324952

(62) Application number of the earlier application in accordance with Art. 76 EPC:
03023574.1 / 1418720

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211-8588 (JP)

(72) Inventor:
  • Yoshida, Makoto, c/o Fujitsu Limited
    Kawasaki-shi, Kanagawa 211-8588 (JP)

(74) Representative: HOFFMANN - EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

 
Remarks:
This application was filed on 05 - 01 - 2005 as a divisional application to the application mentioned under INID code 62.
 


(54) Receiving apparatus in OFDM transmission system


(57) A receiving apparatus in an OFDM transmission system includes a channel estimation unit (101) for measuring a delay profile of a delayed wave having a delay greater than a guard interval of data; a guard-interval-exceed delayed wave detector (103) for detecting, from the delay profile as an intersymbol interference (ISI) portion, a delay-time portion greater than the guard interval of the data; a ISI replica generator (104) for generating, as the ISI replica, a time-waveform portion of a known symbol conforming to the ISI portion, or a time-waveform portion of the preceding symbol; subtractor (102) for subtracting the ISI replica from a receive signal; and an FFT arithmetic unit (106) for demodulating data by applying FFT processing to the result of subtraction.