公开(公告)号：US20210091820A1

公开(公告)日：2021-03-25

申请号：US16952982

申请日：2020-11-19

Applicant: Nestwave SAS

Inventor： Rabih Chrabieh

IPC: H04B1/717 ,  H04B1/7093 ,  G01S1/02

Abstract: A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device; correlating the received signal with a filtered code sequence to create a correlation output, identifying in the correlation output, an observation window associated with a main lobe in the correlation output; and processing the observation window to determine a time of arrival of a first path component in the received signal. The filtered code sequence is formed by incorporating a time of arrival matched filter (TOA-MF) inside predetermined shaped code sequence. The TOA-MF is matched to the predetermined shaped code sequence and is based upon a power delay profile of the wireless channel. The computed shaped code sequence is a convolution of a predetermined shaping sequence and a predetermined code sequence.

公开(公告)号：US20190182679A1

公开(公告)日：2019-06-13

申请号：US16278269

申请日：2019-02-18

Applicant: Nestwave SAS

Inventor： Rabih Chrabieh

IPC: H04W16/20 ,  H04W56/00 ,  H04W4/02 ,  H04W64/00

CPC classification number: H04W16/20 ,  H04W4/02 ,  H04W4/021 ,  H04W4/024 ,  H04W4/33 ,  H04W56/001 ,  H04W64/00

Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.

公开(公告)号：US10212608B2

公开(公告)日：2019-02-19

申请号：US15964057

申请日：2018-04-26

Applicant: Nestwave SAS

Inventor： Rabih Chrabieh

IPC: H04W4/02 ,  H04W16/20 ,  H04W56/00 ,  H04W64/00

Abstract: Positioning determination of a communication device in a wireless communication network is supported by a positioning device receiving [230] tight synchronization signals from a master positioning cell; determining [232] therefrom a plurality of time differences between their actual and theoretical times of arrival; synchronizing [234] a positioning cell clock based on the received tight synchronization signals adjusted by the time differences; and emitting [236] to the communication device a positioning signal at a time determined by the synchronization. The positioning signal includes an identifier of the positioning cell, and it is transmitted so as not to interfere with positioning pilot signals transmitted by the wireless communication network. The positioning device may alternatively receive synchronization signals from another positioning cell instead of a master positioning cell.

公开(公告)号：US10042037B2

公开(公告)日：2018-08-07

申请号：US14626734

申请日：2015-02-19

Applicant: Nestwave SAS

Inventor： Rabih Chrabieh ,  Bogdan Franovici

IPC: H04K1/10 ,  H04L27/28 ,  G01S5/06 ,  G01S5/02 ,  G01S11/02 ,  H04B17/336 ,  H04L27/26

Abstract: A technique is provided for estimating time of arrival of a signal transmitted as a pulse and received as a sum of pulses. The received signal is filtered with a novel filter that lowers the early side lobes of the received signal to noise level. A first energy rise point is identified at a point of the main lobe of the filtered received signal, at which the energy is higher than the noise by a predetermined level. Starting from the identification of the first energy rise points, the time of arrival is estimated via curve matching, in which the shape of the filtered received signal is matched to the shape of composed by a sum of one or more reference curves that are shifted both in time and in energy. The reference curves are found by applying to the transmitted signal the same filter applied to the received signal.