Patent ID: 8045641

Claim:
A method for generating a modulated waveform in a radio frequency identification (RFID) system tags, said method comprising: providing K signals S i M referred to as mother signals of duration T i M and frequencies F i , where i=1 to K and K≧1; generating from said K mother signals K further signals of duration T i C referred to as child signals S i C , where T i C <T i M ; dividing each of said child signal corresponding to each mother signal by means of a powder divider into N i branches resulting in further N i child signals where N i ≧2; introducing different delays TD j i to said N i further child signals after power division, wherein said delays being defined according to a predetermined modulation scheme to be either TD j i =j×T i C , where j=1 . . . N i , or TD j i −TD j-1 i =t x , where j=2 . . . N i and t x =t 0 for a binary zero and t x =t 1 for a binary one with t 0 ≠t 1 ; and forming a signal string by combining said N i signals, wherein said signal string will be interpreted as a data encoded signal corresponding to the mother signal i carrying an identification information.