US 9,674,070 B2 · Method and apparatus for detecting a set up signal used for data communication over a communication network

Abstract

A method of detecting a set up signal having a predetermined frequency and used for data transmissions over a communication network comprises comparing an energy level of a filtered received signal with a first predetermined value and providing a first detect signal, comparing an energy level of a component of the received signal at a predetermined frequency with a second predetermined value and providing a second detect signal. In addition, an autocorrelation function is performed on the received signal to discriminate between the set up signal and other signals in the received signal and a check signal is provided when the autocorrelation function identifies the set up signal. The set up signal in the received signal is detected in response to the first and the second detect signals and the check signal. A method of detecting phase reversals in the set up signal is also disclosed.

Claims20

Dependent claims

A method of detecting phase reversals in a set up signal used for data transmissions over a communication network, the set up signal having a predetermined frequency and including predetermined phase reversals at predetermined intervals, comprising:

filtering a received signal by a filter having a passband including the predetermined frequency, wherein the filtered received signal comprises a plurality of frames, with each frame comprising N frame portions;
determining the energy level of the filtered received signal over different sets of a predetermined number of consecutive frame portions of the filtered received signal;
processing the determined energy levels;
and
detecting the predetermined phase reversals in the set up signal when the determined energy levels correspond to a predetermined pattern.

2 more elements

A method of detecting a set up signal used for data transmissions over a communication network, the set up signal having a predetermined frequency and including predetermined phase reversals at predetermined intervals, comprising:

determining an energy level of a received signal at the predetermined frequency;
comparing the determined energy level with a predetermined value and providing a detect signal when the determined energy level is greater than the predetermined value;
filtering the received signal by a filter having a passband including the predetermined frequency, wherein the filtered received signal comprises a plurality of frames, with each frame comprising N frame portions;
determining the energy level of the filtered received signal over different sets of a predetermined number of consecutive frame portions of the filtered received signal;
processing the determined energy levels;
detecting the predetermined phase reversals in the set up signal when the determined energy levels correspond to a predetermined pattern;
and
detecting the set up signal in the received signal in response to the detect signal or in response to detecting the predetermined phase reversals in the set up signal.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for detecting a set up signal used for data communication over a communication network

Life of this patent

Method and apparatus for detecting a set up signal used for data communication over a communication network

Life of this patent

Abstract

Claims20