Global patent index - EP 1044543 A1

EP 1044543 A1 2000-10-18 - MODULATING A DIGITAL SIGNAL WITH NARROW SPECTRUM AND SUBSTANTIALLY CONSTANT ENVELOPE

Title (en)

MODULATING A DIGITAL SIGNAL WITH NARROW SPECTRUM AND SUBSTANTIALLY CONSTANT ENVELOPE

Title (de)

MODULATION FÜR EIN DIGITALES SCHMALBANDSIGNAL UND NAHEZU KONSTANTER HÜLLKURVE

Title (fr)

MODULATION D'UN SIGNAL NUMERIQUE A SPECTRE ETROIT ET A ENVELOPPE SENSIBLEMENT CONSTANTE

Publication

EP 1044543 A1 (FR)

Application

EP 98962536 A

Priority

  • FR 9802812 W
  • FR 9716454 A

Abstract (en)

[origin: FR2773032A1] The transmitted signal results from the modulation of digital data by a modulation function which is a Gaussian function of time t. The digital data comprises a set of bits bk identified by rank k and of duration T. The transmitted signal consists of an indexed sum by rank k of the product of the complex constant j to the power k, of the modulation function h(t-kT) and of the input data. The modulator comprises a signal processor (PR) which splits the input signal into real and imaginary components in the form S = I + jQ. A time base (BDT) generates a clock Ck and a carrier C. The carrier is fed into a de-phaser circuit DEP. Mixer M1 combines the carrier with real signal I and mixer M2 combines the de-phased carrier with the complex component of the signal. The two outputs are then summed.

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

H04L 27/20; H04L 25/03

IPC 8 full level (invention and additional information)

H04L 25/03 (2006.01); H04L 27/20 (2006.01)

CPC (invention and additional information)

H04L 27/2017 (2013.01); H04L 25/03834 (2013.01)

Citation (search report)

See references of WO 9933238A1

Designated contracting state (EPC)

DE FI GB SE

EPO simple patent family

FR 2773032 A1 19990625; FR 2773032 B1 20011221; CA 2315902 A1 19990701; CN 1284228 A 20010214; EP 1044543 A1 20001018; JP 2001527330 A 20011225; US 6868126 B1 20050315; WO 9933238 A1 19990701

INPADOC legal status

2007-01-10 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20060701

2004-04-28 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20040310

2003-07-30 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: NORTEL NETWORKS SA

- Ref Legal Event Code: RAP1

2000-11-08 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: DORNSTETTER, JEAN-LOUIS

2000-11-08 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: GEORGEAUX, ERIC

2000-10-18 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000809

2000-10-18 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FI GB SE