Patent ID: 7831200
Filing Date: 2010-11-09
Classification: H04B

Abstract:
1. In a communication system including a primary receiver, a primary transmitter, and a repeater that applies a known distortion to a primary signal passing therethrough that identifies the repeater, where the primary receiver receives a first signal from the primary transmitter either directly or via the repeater, and where the first signal includes a primary signal and, if the first signal is received from the repeater, also includes a secondary signal that is a function of the primary signal and the known distortion applied by the repeater, the method of determining if a signal received by the primary receiver is received directly from the primary transmitter or indirectly through the repeater, comprising the steps of: receiving the first signal at the primary receiver; outputting the primary signal from the primary receiver; receiving the first signal at a secondary receiver and obtaining the primary signal from the primary receiver; applying an inverse function to the first signal and the primary signal to retrieve a distortion; and determining whether the first signal has been received from the repeater by comparison of the distortion and known distortions.