# US 8,462,836 B2 · Method for detecting offset signal corresponding to transmission leakage signal

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- Number: US 8,462,836 B2
- Document ID: US8462836B2
- Status: Granted
- Kind: B2
- Application number: 13/028,146
- Filed: 2011-02-15
- Published: 2011-08-18
- Granted: 2013-06-11
- Earliest claimed: 2010-02-18
- Assignees: Nethom
- Applicants: Heon soo Choi
- Inventors: Heon soo Choi
- Web page: https://patentgrep.com/patent/US8462836B2

## CPC

- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H04B: TRANSMISSION

## Abstract

A method for detecting offset signal corresponding to transmission leakage signal is disclosed, whereby reception sensitivity can be improved by accurately offsetting a leakage signal in transmission signal mixedly inputted into the reception signal in a radio transceiver, and an offset signal corresponding to a transmission leakage signal can be rapidly detected in the radio transceiver to rapidly offset the transmission leakage signal included in a reception signal.

## Claims

### Claim 1

A method for determining an offset signal corresponding to a transmission leakage signal via a leakage signal offset unit located in a radio transceiver, the method comprising:
setting, by the leakage signal offset unit, a leakage signal of a transmission signal on a vector phase-plane relative to a magnitude and a phase;
dividing, by the leakage signal offset unit, the vector phase-plane into a plurality of areas in order to obtain a plurality of sample points for each of the plurality of areas;
sequentially detecting, by the leakage signal offset unit, a vector between a first sample point and a second sample point among the plurality of sample points for each of the plurality of areas;
calculating, by the leakage signal offset unit, a gradient of a resultant vector relative to the detected vector;
determining, by the leakage signal offset unit, whether the resultant vector has converged into a current area by determining whether a central sample point is positioned below a planar surface of other sample points among the plurality of sample points;
repeating, by the leakage signal offset unit, setting the leakage signal, dividing the vector phase-plane, sequentially detecting the vector, calculating the gradient, and determining whether the resultant vector has converged at least once when a descending gradient converging into the current area is detected; and
determining, by the leakage signal offset unit, the offset signal corresponding to the transmission leakage signal by using a maximum descending gradient among the detected descending gradients.

### Claim 2 (depends on 1)

The method of claim 1, wherein the plurality of areas forms a quadrant.

### Claim 3 (depends on 1)

The method of claim 1, wherein:
the central sample point is positioned at a center of an area comprising the plurality of sample points; and
the other sample points symmetrically surround the central sample point.

### Claim 4 (depends on 3)

The method of claim 3, wherein:
the other sample points are positioned at a vertex of a square; and
the central sample point is positioned at a center of the square.

### Claim 5 (depends on 1)

The method of claim 1, wherein the calculated gradient corresponds to a surface gradient of the vector phase-plane.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
determining a lowest point corresponding to the maximum descending gradient; and
determining the offset signal corresponding to the transmission leakage signal by using the determined lowest point.