EP 1129524 A1 20010905 - SPREAD SPECTRUM TRANSMISSION SYSTEM WITH REDUCTION OF INTERSYMBOL INTERFERENCE
Title (en)
SPREAD SPECTRUM TRANSMISSION SYSTEM WITH REDUCTION OF INTERSYMBOL INTERFERENCE
Title (de)
SPREIZSPEKTRUMÜBERTRAGUNGSSYSTEM MIT VERMINDERUNG DER INTERSYMBOLSTÖRUNG
Title (fr)
SYSTEME D'EMISSION A SPECTRE ETALE AVEC REDUCTION DU BROUILLAGE INTER-SYMBOLES
Publication
Application
Priority
- EP 00960563 A 20000831
- EP 0008495 W 20000831
- EP 99202952 A 19990910
Abstract (en)
[origin: WO0120798A1] In a spread spectrum communication system a transmitter uses a spreading codeword to obtain spreaded digital symbols from source symbols. These spreaded digital symbols are transmitted to a receiver which uses de-spreading means to obtain the originally transmitted source symbols. A problem in spread spectrum transmission system is that due to multipath transmission so-called intersymbol interference can occur. This intersymbol interference causes an increased bit error rate. In the transmission system according to the present invention it is proposed to use a de-spreading codeword which is shorter than the spreading codeword, so no overlap of signals originated from different symbols with the despreading codeword occurs. Preferably, the spreading codeword comprises a concatenation of the despreading codeword and a preamble. This preamble can be a cyclically permutated part of the despreading codeword.
IPC 1-7
IPC 8 full level
H04B 1/707 (2011.01); H04W 16/00 (2009.01)
CPC (source: EP KR)
H04B 1/7073 (2013.01 - KR); H04B 1/7075 (2013.01 - EP); H04B 1/711 (2013.01 - KR); H04J 13/0003 (2013.01 - KR); H04B 1/70751 (2013.01 - EP); H04B 1/7117 (2013.01 - EP)
Citation (search report)
See references of WO 0120798A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 0120798 A1 20010322; CN 1294704 C 20070110; CN 1337097 A 20020220; EP 1129524 A1 20010905; JP 2003509946 A 20030311; KR 20010092451 A 20011025
DOCDB simple family (application)
EP 0008495 W 20000831; CN 00802676 A 20000831; EP 00960563 A 20000831; JP 2001524255 A 20000831; KR 20017005789 A 20010508