Detection device and detection method

Patent metadata

Field	Value
Publication number	US-10623973-B2
Application number	US-201815887911-A
Country	US
Kind code	B2
Filing date	Feb 2, 2018
Priority date	Feb 2, 2018
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A detection device for communicating with an external device includes a smart antenna, a storage device, and a processor. The smart antenna is capable of switching between a plurality of antenna modes. In each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator. The processor compares all of the indicators with each other and controls the smart antenna to select the final mode of the antenna modes according to a comparison between all of the indicators.

First claim

What is claimed is:

1. A detection device for communicating with an external device, comprising:
a smart antenna, wherein the smart antenna is capable of switching between a plurality of antenna modes;
a storage device; and
a processor;
wherein in each of the antenna modes, the smart antenna transmits a test datum and receives a feedback datum according to the test datum, the processor performs a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, the processor calculates an indicator according to the feedback datum and the time reversal datum, and the storage device stores the feedback datum, the time reversal datum, and the indicator,
wherein the feedback datum comprises a reference channel impulse response and an instant channel impulse response which are obtained at different times,
wherein the time reversal datum comprises a time reversal channel impulse response relative to the instant channel impulse response,
wherein the indicator comprises a resonant strength based on the reference channel impulse response and the time reversal channel impulse response as follows:

η
=

max

i
=
1

L

⁢



(

h
1

*

g
2

)

⁢

(
i
)



∑

i
=
1

L

⁢



h
1

⁡

(
i
)



2

·

∑

j
=
1

L

⁢



g
2

⁡

(
j
)



2

where “η” represents the resonant strength, “h 1 (i)” represents the reference channel impulse response measured in “i”th tap, “g 2 (j)” represents the time reversal channel impulse response measured in “j” th tap, “(h 1 *g 2 )(i)” represents a convolution of the reference channel impulse response and the time reversal channel impulse response measured in “i”th tap, and “L” represents a total length of the taps;

wherein the processor compares all of the indicators with each other and controls the smart antenna to select a final mode of the antenna modes according to a comparison between all of the indicators;
wherein the final mode corresponds to an average of all of the indicators or a minimum of all of the indicators.

2. The detection device as claimed in claim 1 , wherein the detection device is configured to determine whether a surrounding environment changes.

3. The detection device as claimed in claim 1 , wherein the antenna modes comprise different radiation patterns of the smart antenna.

4. The detection device as claimed in claim 1 , wherein the antenna modes comprise different polarization directions of the smart antenna.

5. A detection method using a detection device for communicating with an external device, the detection device comprising a smart antenna which is capable of switching between a plurality of antenna modes, and the detection method comprising the steps of:
in each of the antenna modes, transmitting a test datum and receiving a feedback datum according to the test datum, performing a time reversal algorithm to the feedback datum so as to obtain a time reversal datum, and calculating an indicator according to the feedback datum and the time reversal datum,
wherein the feedback datum comprises a reference channel impulse response and an instant channel impulse response which are obtained at different times,
wherein the time reversal datum comprises a time reversal channel impulse response relative to the instant channel impulse response,
wherein the indicator comprises a resonant strength based on the reference channel impulse response and the time reversal channel impulse response as follows:

η
=

max

i
=
1

L

⁢



(

h
1

*

g
2

)

⁢

(
i
)



∑

i
=
1

L

⁢



Assignees

• Wistron Neweb Corp

Inventors

• Chang Huai-Ming
• Chen Horen
• Huang Tsun-Che

Classifications

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W8/005 Primary

  Discovery of network devices, e.g. terminals · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title