Patent ID: 11929792
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. An energy transmitter adapted to transmit energy to a particular energy harvester using radiative coupling, wherein the energy transmitter is adapted to:
for each time period (TPi) of a plurality of time periods ({TPi}i=0,1, . . . , I-1) where I is a positive integer that is greater than or equal to 2:
for each time slot (TSi,j) of one or more time slots ({TSi,j}j=0,1, . . . , J-1) where J is a positive integer that is greater than or equal to 1 for the time period (TPi):
transmit, during the time slot (TSi,j) of the time period (TPi) on a frequency fmod(1,2), a radio frequency signal (ST(i,j)) that is modulated with a signature of the particular energy harvester, wherein mod(*) is the modulo-2 operator such that fmod(1,2) is a first frequency f0 for even values of i including i=0 and is a second frequency f1 for odd values of i; and

attempt, during the time period (TPi), to receive, from the particular energy harvester on a frequency fmod(1+1,2), a radio frequency signal (SR(i)) that is modulated with the signature of the particular energy harvester, wherein mod(*) is the modulo-2 operator such that fmod(i+1,2) is the second frequency f1 for even values of i including i=0 and is the first frequency f0 for odd values of i.