Communication device and method in the cellular band
AssigneeSemtech Corporation
InventorsOlivier Bernard André SELLER, Nicolas Sornin
Life of this patent
Estimating the term…
Abstract
A wireless communication method in a network comprising a plurality of nodes including ranging masters, broadcasting a chirp-modulated ranging requests, and ranging slaves slave, replying with thereto with chirp-modulated ranging responses, whereby mobile nodes can locate themselves passively by listening to the request/reply exchanges, based on the respective time differences of arrival.
Claims10
1-9. (canceled)
A wireless communication network including a plurality of nodes, each node having a time reference, and being arranged for receiving and transmitting chirp-modulated radio signals, wherein the phase of the chirps is described by a continuous function, such that a node receiving the radio signal can align its time reference with that of a node transmitting the radio signal, wherein at least a subset of the nodes, acting as master, are arranged to broadcast a chirp-modulated ranging request, and at least a subset of the nodes, acting as slave, are arranged to receive the ranging requests and reply with a chirp-modulated ranging response, and at least one mobile node is operatively arranged to receive both the ranging requests of the masters and the ranging responses of the slaves, and determine for each pair of one ranging request and one ranging reply, a difference of the propagation time between the master and the mobile node minus the propagation time between the slave and the mobile node, whereby the position of the mobile node is determined, based on said difference of propagation times and on the positions of said masters and slaves.
Dependencies are inferred from the claim text.