公开(公告)号：US20210176103A1

公开(公告)日：2021-06-10

申请号：US17254696

申请日：2019-06-21

Applicant: SAFRAN DATA SYSTEMS ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Alain THOMAS ,  Jean-Marc LEVEAU ,  Stanislas AUGARDE ,  Emmanuel BOUISSON ,  Adrien GAY

IPC: H04L27/233 ,  H04L7/06 ,  H04B1/00

Abstract: Method for processing a sequence of digital signal samples comprising a first sub-sequence and a second sub-sequence, said method comprising: forming (106) a first block of samples comprising the first sub-sequence and a second block of samples comprising header samples followed by the second sub-sequence; demodulating (108) the first block of samples through a digital demodulator to produce a first block of symbols, and the second block of digital signal samples through a second digital demodulator to produce a second block of symbols, the second demodulator implementing a carrier synchronisation or symbol rate synchronisation starting with the header samples (E6-E9), which comprise samples in a number adapted in such a way that the synchronisation is effective before the second demodulator demodulates the second sub-sequence; and reconstructing (114) a sequence of symbols by concatenating the first symbol block with the second symbol block.

公开(公告)号：US20190036593A1

公开(公告)日：2019-01-31

申请号：US16072694

申请日：2017-01-27

Applicant: ZODIAC DATA SYSTEMS ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas PASTERNAK ,  Alain THOMAS ,  Clément DUDAL ,  Mathieu LLAURO ,  Jean-Pierre MILLERIOUX

IPC: H04B7/10 ,  H04B17/336 ,  H04B7/00 ,  H04B7/04

CPC classification number: H04B7/10 ,  H04B7/002 ,  H04B7/04 ,  H04B17/336

Abstract: The invention relates to a radio communication receiver receiving a radio signal (S) including a main polarisation (MAIN-POL) and a secondary polarisation (X-POL) orthogonal to the main polarisation (MAIN-POL), the receiver including: a unit (1) for receiving the main polarisation (MAIN-POL) and the secondary polarisation of the received signal, synchronised as a carrier frequency with the main polarisation (MAIN-POL); a unit (2) for cancelling out the secondary polarisation synchronised with the main polarisation (MAIN-POL) and configured to suppress, from the received signal (S), the interference due to the secondary polarisation (X-POL), the unit (2) for cancelling out the secondary polarisation including a filtering unit (21) that receives the main polarisation (MAIN-POL) and the secondary polarisation (X-POL) as input; a unit (3) for demodulating the filtered signal, located downstream of the cancellation unit and configured to calculate carrier frequency error information and to communicate same by feedback to the upstream receiving unit (1).

公开(公告)号：US20210351907A1

公开(公告)日：2021-11-11

申请号：US17272036

申请日：2019-08-30

Applicant: SAFRAN DATA SYSTEMS

Inventor： Youcef SINI ,  Alain THOMAS ,  Nicolas PASTERNAK

IPC: H04L7/033 ,  H04L27/00

Abstract: The invention relates to a method of date-stamping reception of digital data of a modulated signal, said signal resulting from the modulation of a carrier or sub-carrier by a digital signal, the bitrate of symbols of the digital signal being an integer sub-multiple N of the frequency of the carrier or sub-carrier, said method comprising the steps consisting in: —coherent demodulation by means of a phase loop of a plurality of samples sm(k) of the modulated signal and obtaining of a plurality of demodulated samples sdm(k) and of the phase of the reconstructed carrier; —association of the plurality of demodulated samples sdm(k) with the simultaneous phase φ(k) of the reconstructed carrier —determination of a plurality of dates of passage to a determined value φ0 of the phase of the reconstructed carrier, relative to the date of reception of at least one sample sm(k), according to a time shift during which the carrier rotates from φ(k) to φ0.