Rauschverteilungsformung für Cdma-Signale

Details

Veröffentlichungs-Nr.

EP3905536

Aktenzeichen

EP20171747

Anmeldetag

28. April 2020

Veröffentlichung

18. September 2024

Erteilung

18. September 2024

Rechtsraum

EP

IPC

H04B1/7097G01S19/24G01S19/21G01S19/35

Abstract

The present invention provides a method of noise distribution shaping for signal acquisition of a Code Division Multiple Access signal. The method comprises demodulating the CDMA signal by multiplying with a carrier signal modulated with an estimated Doppler frequency. The carrier of the carrier signal is the CDMA signal carrier. The method further comprises generating a test signal having a spreading sequence according to the CDMA signal. The test signal is shifted by an estimated code delay. The method comprises modifying the noise distribution of the CDMA signal to generate a modified CDMA signal by blanking samples of the CDMA signal, when the samples of the CDMA signal exceed an upper or lower blanking threshold. The upper and lower blanking thresholds are offset by a square root of an estimated power, P_est, of the CDMA signal multiplied by a chip value polarity of the generated test signal and a predefined scaling factor, α. α is positive, negative, constant, time dependent, or changing its sign over time as function of the generated test signal. The method comprises acquiring the CDMA signal, when a correlation between the modified CDMA signal and the generated test signal is above a predefined detection threshold.

Anmelder

Firma

Airbus Defence and Space GmbH

Land

🇩🇪 Deutschland

Fachgebiete