Low complexity, low power and long range radio receiver
AssigneeSemtech Corporation
InventorsOlivier Bernard André SELLER, Nicolas SORNIN
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Abstract
A radio receiver for processing digital chirp spread-spectrum modulated signals that comprise a plurality of frequency chirps that are cyclically time-shifted replicas of a base chirp profile, said time-shifts being an encoded representation of a transmitted message. Includes a soft demapping unit that is adapted for working on fully populated as well as on partial modulation sets, and implements a timing error correction loop that acts back both in the time domain and in the frequency domain.
Claims9
A radio receiver for processing digital chirp spread-spectrum modulated signals that comprise a plurality of frequency chirps that are cyclically time-shifted replicas of a base chirp profile, said time-shifts being an encoded representation of a transmitted message, wherein the receiver includes a soft demapping unit arranged to determine, for each received chirp of said plurality of frequency chirps, a plurality of soft values representing probability of possible symbols or bits in the transmitted message.
Dependencies are inferred from the claim text.