Patent ID: 8515454

Claim:
A method of determining a position of a node in a wireless modulation technique in which a carrier signal is modulated for wireless communications, the method comprising: sending a request for a communication to the node; receiving, in response to the request, a wireless communication from the node; receiving an information signal modulating and carried by the carrier signal, from the node for specifying a node-processing turnaround time of the node, the turnaround time sufficiently accurate to account for a time span defined between a time at which the request is received by the node and a clock edge of a clock used by the node for processing, the clock edge controlling a time at which receipt of the request is detected by the node, the time span being a non-zero fraction of one cycle of the clock; determining a time difference between the sending and the receiving, wherein the time difference includes the turnaround time; and calculating a position of the node from the timing.