Signal concentrator device
AssigneeSemtech Corporation
InventorsNicolas Sornin, Ludovic Champion
Life of this patent
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Abstract
A gateway device having a baseband processor for processing a plurality signals carrying a digital information modulated in the form of chirp signal, the chirp signals being either base chirps, for which the frequency changes from an initial instant to a final instant according to a predetermined base chirp function or modulated chirps, whose instantaneous frequencies vary according to one of a plurality of a functions that differ from said base chirp function, characterized in that the gateway device is arranged for simultaneously demodulating a plurality of signals having received at a same frequency and exhibiting different bitrates.
Claims13
A gateway device having a processor for processing a plurality of signals carrying a digital information modulated in the form of chirp signals, the chirp signals being either base chirps, for which the frequency changes from an initial instant to a final instant according to a predetermined base chirp function or modulated chirps, whose instantaneous frequencies vary according to one of a plurality of a functions that differ from said base chirp function, each base chirp and each modulated chirp corresponding to a symbol of a modulation alphabet, the gateway device further comprising one demodulator or several demodulators, arranged for reconstructing the digital information based on said symbols, and for simultaneously demodulating a plurality of signals, whose frequencies overlap, and having different bitrates, and different spreading factors or chirp lengths, wherein the different spreading factors or chirp lengths provide for orthogonality between the plurality of signals.
A gateway device having a processor for processing a plurality signals carrying a digital information modulated in the form of chirp signals, the chirp signals being either base chirps, for which the frequency changes from an initial instant to a final instant according to a predetermined base chirp function or modulated chirps, whose instantaneous frequencies vary according to one of a plurality of a functions that differ from said base chirp function, the gateway device further comprising a plurality of demodulators, arranged for simultaneously demodulating a plurality of signals having different bitrates, wherein said chirp signals include preamble parts, and the gateway device further comprising a preamble search engine, the preamble search engine being operatively arranged to scan the signals generated from frequency converters, identify said preamble parts for all data rates and, when a preamble is detected, cause a corresponding message to be decoded in one of said plurality of demodulators, the gateway device further comprising a packet arbiter unit, operatively arranged for assigning messages corresponding to said detected preambles to one demodulator of the plurality of demodulators.
Dependencies are inferred from the claim text.