Global Patent Index - EP 1044543 A1

EP 1044543 A1 20001018 - 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 20001018 (FR)

Application

EP 98962536 A 19981221

Priority

  • FR 9802812 W 19981221
  • FR 9716454 A 19971222

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

H04L 27/20; H04L 25/03

IPC 8 full level

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

CPC (source: EP US)

H04L 25/03834 (2013.01 - EP US); H04L 27/2017 (2013.01 - EP US)

Citation (search report)

See references of WO 9933238A1

Designated contracting state (EPC)

DE FI GB SE

DOCDB simple family (publication)

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

DOCDB simple family (application)

FR 9716454 A 19971222; CA 2315902 A 19981221; CN 98813261 A 19981221; EP 98962536 A 19981221; FR 9802812 W 19981221; JP 2000526023 A 19981221; US 58212700 A 20000821