US Patent No. 10,893,473

ENVELOPE MODULATION FOR CONCURRENT TRANSMISSION OF A WAKE-UP SIGNAL AND USER DATA


Patent No. 10,893,473
Issue Date January 12, 2021
Title Envelope Modulation For Concurrent Transmission Of A Wake-up Signal And User Data
Inventorship Miguel Lopez, Solna (SE)
Dennis Sundman, Solna (SE)
Leif Wilhelmsson, Dalby (SE)
Assignee Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)

Claim of US Patent No. 10,893,473

1. A method in a transmitting device, comprising:forming an Orthogonal Frequency-Division Multiplexing (OFDM) signal comprising a plurality of OFDM symbols and carrying user data targeted to a main transceiver of each of one or more receiving devices;
modulating the OFDM signal with a wake-up signature (WUS) targeted to a wake-up receiver (WUR) of a first receiving device other than the one or more receiving devices, wherein said modulating comprises superimposing a series of logical ones and zeroes of the WUS onto a series of OFDM symbols by varying the signal power across the series of OFDM symbols without blanking out user data carried by the series of OFDM symbols, the resulting variations in signal power conveying the logical ones and zeros of the WUS; and
transmitting the modulated OFDM signal.