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
Application
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
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