US 2011/0079720 A1 · SYSTEMS AND METHODS FOR BLIND ECHO CANCELLATION

Abstract

System and method for blind echo cancellation in a received terahertz signal in a pulsed terahertz system for imaging or spectroscopy. Blind signal processing methods estimate the impulse response of the reflection mechanism and do not require a reference measurement to be taken. The reference signal may be recovered using a successive approach wherein the reference is first estimated using cross-correlation with the received signal and the received signal is represented as a function of the reference signal. For each successive echo, the calculated echo may be subtracted from the received signal and then the estimate of the reference signal is refined. Using an analytical approach, the parameters of a transfer function modeling the reflection mechanism may be estimated by optimizing a cost function.

Claims17

Dependent claims

A method for canceling echoes in a terahertz signal, the method comprising the steps of:

receiving a terahertz signal containing echoes;
estimating a reference signal from the received signal;
calculating the echoes as a function of the reference signal;
for at least one of the successive echoes,
subtracting the calculated echo from the received signal to form a refined reference signal;
and
re-calculating the echoes as a function of the refined reference signal.

4 more elements

Dependencies are inferred from the claim text.

Systems and methods for blind echo cancellation

Life of this patent

Systems and methods for blind echo cancellation

Life of this patent

Abstract

Claims17