Global Patent Index - EP 1103124 A1

EP 1103124 A1 2001-05-30 - RECEIVER FOR DIGITAL SIGNALS PROPAGATED IN CHANNELS WITH MULTIPLE PATHS

Title (en)

RECEIVER FOR DIGITAL SIGNALS PROPAGATED IN CHANNELS WITH MULTIPLE PATHS

Title (de)

EMPFÄNGER FÜR DIGITALE SIGNALE, DIE IN MEHRWEGKANÄLEN ÜBERTRAGEN WERDEN

Title (fr)

RECEPTEUR DE SIGNAUX NUMERIQUES PROPAGES DANS DES CANAUX AVEC PLUSIEURS TRAJETS

Publication

EP 1103124 A1 (EN)

Application

EP 99940115 A

Priority

  • EP 9905572 W
  • IT MI981839 A

Abstract (en)

[origin: WO0008816A1] A method and a receiver for equalization of received digital signals r(n) propagating in a scattered communication channel with multiple time-unvarying and also time-varying paths which give rise to time and frequency distortions with channel pulsed response (CIR) having total length equal to L symbol intervals. In accordance with the method the scattered channel state is divided in three components and to wit the observable, close hidden and distant hidden states. The channel is then estimated on the basis of a vector <u>p</u>'(n) of the a posteriori probabilities (APP) of the observable state <u>b</u>'(n) and on the basis of the received sequence r(n) and the received symbol decision is made on the basis of a maximum a posteriori probability (MAP) based on the above mentioned APP vector <u>p</u>'(n) of the channel observable state. The CIR can be estimated in relation to a probe sequence contained in the received signal and the result of the estimate is used during reception of the remaining part of the signal and if necessary updated if the channel is time-varying.

IPC 1-7 (main, further and additional classification)

H04L 25/03; H04B 7/005; H04L 25/02

IPC 8 full level (invention and additional information)

H04L 25/02 (2006.01); H04L 25/03 (2006.01)

CPC (invention and additional information)

H04L 25/0212 (2013.01); H04L 25/03171 (2013.01); H04L 2025/03796 (2013.01)

Citation (search report)

See references of WO 0008816A1

Designated contracting state (EPC)

DE ES FR GB IT

EPO simple patent family

WO 0008816 A1 20000217; AU 5418099 A 20000228; CA 2339499 A1 20000217; CN 1369162 A 20020911; EP 1103124 A1 20010530; IT 1301907 B1 20000707; IT MI981839 A1 20000207; IT MI981839 D0 19980805

INPADOC legal status


2005-08-10 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20050201

2004-05-12 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): DE ES FR GB IT

2001-05-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010228

2001-05-30 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2001-05-30 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI