System and method for identifying the path or devices on the path of a communication signal
AssigneeAndrew Corporation
InventorsMartin Alles, Joseph P. Kennedy, JR., John P. Carlson
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Abstract
A system and method of applying a known modification in the form of a distortion to a signal to enable a determination if a signal received by a first node is received directly from a second node or indirectly through a repeater. The repeater receives a primary signal and creates a secondary signal as a function of the primary signal and a known distortion, wherein the known distortion identifies the repeater. The primary signal is transmitted and injected with the secondary signal as the first signal to the primary receiver.
Claims34
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.
In a communication system including a first node, a second node, and a repeater, wherein the first node receives a first signal from the second node either directly or via the repeater, a method of applying a known distortion to a signal to enable a determination of a signal received by the first node is received directly from the second node or indirectly through the repeater, comprising the steps of:
- at the repeater receiving a primary signal and creating a secondary signal as a function of the primary signal and a known distortion, wherein the known distortion identifies the repeater,
- transmitting the primary signal injected with the secondary signal as the first signal to the primary receiver.
In a wireless communication system having one or more repeaters, a first node and a second node, a method of determining if a signal received at the first node is received directly from the second node or via one of the one or more repeaters comprising;
- creating, at the one or more repeaters, a secondary signal s′(t) that is a function ƒ(i,s(t)) of a primary signal s(t) received from the second node and a known distortion, i, applied by the one or more repeaters, where i is unique for each of the one or more repeaters;
- injecting the secondary signal s′(t) into the primary signal s(t) to form a first signal;
- transmitting the first signal w(t) to the first node;
- detecting at the first node the primary signal s(t);
- removing the primary signal s(t) to recover the secondary signal s′(t);
- determining a distortion from an inverse function g(s′(t),s(t)) of the secondary signal s′(t) and the primary signal s(t), where g is the inverse of f;
- comparing the distortion i to the known distortions thereby determining if the signal is received via the one or more repeaters.
Dependencies are inferred from the claim text.