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US 10,855,329 B2Granted
Relative frequency hops in low-power, wide-area network
AssigneeSemtech Corporation
InventorsOlivier Bernard André Seller, Nicolas Sornin
Life of this patent
Estimating the term…
Abstract
A hopping spread-spectrum wireless network for IoT applications with mobile device that have unsynchronized local frequency references. The transmitters use hopping sequences defined in term of the relative differences of frequencies, in such a manner that a receiver can determine the hopping sequence of a transmission despite the presence of a large frequency error.
Claims13
A wireless communication network comprising a plurality of radio transmitting devices in a frequency band that is divided into a plurality of channels, wherein,
- the transmitting devices have each a local frequency reference, and are arranged to modulate a carrier and processing the modulated signals into a spread spectrum radio signal by switching a frequency of the carrier among several hopping frequencies in the frequency band according to a hopping sequence and,
- the transmitters being arranged to determine the hopping sequence by incrementing repeatedly a channel of an initial hopping frequency according to a determined succession of increments, thereby obtaining a sequence of channels, each channel in the sequence defining an element of the hopping sequence, and transmit the spread spectrum radio signal through a radio interface.
Dependencies are inferred from the claim text.