Patent ID: 8462829

Claim:
A method of communicating a message between a transmitter and a receiver comprising: generating a direct sequence spread spectrum (DSSS) code string that includes at least one instance of a pseudo-noise (PN) sequence followed by a shifted PN sequence, said PN sequence including a plurality of chips arranged in a first order, said shifted PN sequence including said plurality of chips arranged in a second order, said shifted PN sequence being produced in response to said message; transmitting a beacon signal from said transmitter toward a receiver, said beacon signal being modulated by said DSSS code string; receiving said beacon signal at said receiver in response to said transmitting operation; forming correlation peaks at said receiver, one each of said correlation peaks being associated with one each of said at least one instance of said PN sequence and said shifted PN sequence in said beacon signal; determining a shift value from said correlation peak associated with said shifted PN sequence; and decoding said shift value to produce said message.