Patent US5854612A successfully refreshed from Google Patents.
US5854612A
Expired / Lapsed
US
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Method and apparatus for controlling array antenna
Assignee: KDDI Corp
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Filing: 1998-02-09
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Granted: 1998-12-29
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Expires: 2018-02-09
Abstract
Abstract A method of controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals. The method includes a step of estimating a DOA of incident signal based upon the antenna output signals, a step of calculating weights with reference to the estimated DOA, a step of multiplying the antenna output signals by the calculated weights, respectively, and a step of summing the multiplied antenna output signals. The estimating step includes a first step of calculating a phase difference between the output signals of the two antenna elements during burst, a second step of calculating a phase difference between the output signals of the two antenna elements during an interval of bursts, and a third step of calculating a difference between the calculated phase differences.
Inventors
- 👤 Yukihiro Kamiya
- 👤 Shinichi Nomoto
- 👤 Hideo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/48; G01S3/74; H01Q3/2652
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
123 words
A method of controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising the steps of: estimating a DOA of incident signal based upon the antenna output signals; calculating weights with reference to the estimated DOA; multiplying the antenna output signals by the calculated weights, respectively; and summing the multiplied antenna output signals, wherein said estimating step includes a first step of calculating a phase difference between the output signals of two of the antenna elements during burst, a second step of calculating a phase difference between the output signals of two antenna elements during an interval of bursts, and a third step of calculating a difference between said calculated phase differences.
Claim 2
Independent Claim
123 words
A method of controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising the steps of: estimating a DOA of incident signal based upon the antenna output signals; calculating weights with reference to the estimated DOA; multiplying the antenna output signals by the calculated weights, respectively; and summing the multiplied antenna output signals, wherein said estimating step includes a first step of calculating a phase difference between the output signals of two of the antenna elements during burst, a second step of calculating a phase difference between the output signals of two antenna elements during an interval of bursts, and a third step of calculating a difference between said calculated phase differences.
Claim 3
Dependent Claim
65 words
The method as claimed in claim 1, wherein said first step includes a step of calculating a time average of the phase difference between the output signals of the two antenna elements during burst, and wherein said second step includes a step of calculating a time average of the phase difference between the output signals of the two antenna elements during an interval of bursts.
Claim 4
Dependent Claim
44 words
The method as claimed in claim 2, wherein said third step includes a step of temporally storing one of said calculated phase differences, and a step of calculating a difference between the stored phase difference and the other one of said calculated phase differences.
Claim 5
Dependent Claim
138 words
The method as claimed in claim 1, wherein one of said antenna elements is determined to be a reference antenna element, wherein said first step includes a step of calculating the product of X 0 *X 1 , where X 0 * is a complex conjugate of the output signal from the reference antenna element during burst, and X 1 is the output signal of the antenna element adjacent to the reference antenna element during burst, and wherein said second step includes a step of calculating the product of X 0 *X 1 , where X 0 * is a complex conjugate of the output signal from the reference antenna element during an interval, of bursts, and X 1 is the output signal of the antenna element adjacent to the reference antenna element during an interval of bursts.
Claim 6
Dependent Claim
170 words
The method as claimed in claim 4, wherein said first step includes a step of calculating the product of: X.sub.0 *X.sub.1 =A.sub.D.sup.2 e.sup.jα.sbsp.D +A.sub.D A.sub.I e.sup.j (ω.sbsp.I.sup.-ω.sbsp.D.sup.)t+(φ.sbsp.I.sup.-.phi..sbsp.D.sup.)+α.sbsp.I.sup.! +A.sub.D A.sub.I e.sup.j (ω.sbsp.D.sup.-ω.sbsp.I.sup.)t+(φ.sbsp.D.sup.-.phi..sbsp.I.sup.)+α.sbsp.D.sup.! +A.sub.I.sup.2 e.sup.jα.sbsp.I where A D and A I are amplitude, ω D and ω I are angular carrier frequency, and φ D and φ I are the sum of initial phase and modulation phase, suffixes D and I are a desired signal and an interferer, and α D and α I are phase differences from the reference antenna element caused by θ D and θ I of: α.sub.D =2πd sin θ.sub.D /λ α.sub.I =2πd sin θ.sub.I /λ where θ D and θ I are angles of arrival of the desired signal and the interferer, d is a distance between the reference antenna element and the adjacent antenna element, and λ is a wave length of the incident signal, and wherein said second step includes a step of calculating the product of: X.sub.0 *X.sub.1 =A.sub.I e.sup.-j(ω.sbsp.I.sup.t+φ.sbsp.I.sup.) A.sub.I e.sup.j(ω.sbsp.I.sup.t+φ.sbsp.I.sup.+α.sbsp.I.sup.) =A.sub.I.sup.2 e.sup.jα.sbsp.I.
Claim 7
Dependent Claim
48 words
The method as claimed in claim 1, wherein said method further comprises a step of detecting a TDMA slot timing in accordance with the antenna output signals, and a step of judging whether it is burst or an interval of bursts by using the detected TDMA slot timing.
Claim 8
Dependent Claim
45 words
The method as claimed in claim 1, wherein said estimating step includes a fourth step of estimating a DOA based upon phase differences of a plurality of element pairs having the same spacing, and a fifth step of calculating spatial average of the estimated DOA.
Claim 9
Dependent Claim
44 words
The method as claimed in claim 1, wherein said estimating step includes a fourth step of estimating a DOA based upon phase differences of a plurality of element pairs having different spacings, and a fifth step of calculating spatial average of the estimated DOA.
Claim 10
Dependent Claim
58 words
The method as claimed in claim 1, wherein said method further comprises a step of adding a feedback value to the estimated DOA to produce a sum, a step of delaying the sum, and a step of multiplying the delayed sum by a predetermined constant to produce said feedback value, said sum being provided as the estimated DOA.
Claim 11
Independent Claim
128 words
An apparatus for controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising: means for estimating a DOA of incident signal based upon the antenna output signals; means for calculating weights with reference to the estimated DOA; means for multiplying the antenna output signals by the calculated weights, respectively; and means for summing the multiplied antenna output signals, wherein said estimating means includes a first means for calculating a phase difference between the output signals of two of the antenna elements during burst, a second means for calculating a phase difference between the output signals of two antenna elements during an interval of bursts, and a third means for calculating a difference between said calculated phase differences.
Claim 12
Independent Claim
128 words
An apparatus for controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising: means for estimating a DOA of incident signal based upon the antenna output signals; means for calculating weights with reference to the estimated DOA; means for multiplying the antenna output signals by the calculated weights, respectively; and means for summing the multiplied antenna output signals, wherein said estimating means includes a first means for calculating a phase difference between the output signals of two of the antenna elements during burst, a second means for calculating a phase difference between the output signals of two antenna elements during an interval of bursts, and a third means for calculating a difference between said calculated phase differences.
Claim 13
Dependent Claim
63 words
The apparatus as claimed in claim 10, wherein said first means includes means for calculating a time average of the phase difference between the output signals of the two antenna elements during burst, and wherein said second means includes means for calculating a time average of the phase difference between the output signals of the two antenna elements during an interval of bursts.
Claim 14
Dependent Claim
42 words
The apparatus as claimed in claim 11, wherein said third means includes means for temporally storing one of said calculated phase differences, and means for calculating a difference between the stored phase difference and the other one of said calculated phase differences.
Claim 15
Dependent Claim
136 words
The apparatus as claimed in claim 10, wherein one of said antenna elements is determined to be a reference antenna element, wherein said first means includes means for calculating the product of X 0 *X 1 , where X 0 * is a complex conjugate of the output signal from the reference antenna element during burst, and X 1 is the output signal of the antenna element adjacent to the reference antenna element during burst, and wherein said second means includes means for calculating the product of X 0 *X 1 , where X 0 * is a complex conjugate of the output signal from the reference antenna element during an interval of bursts, and X 1 is the output signal of the antenna element adjacent to the reference antenna element during an interval of bursts.
Claim 16
Dependent Claim
168 words
The apparatus as claimed in claim 13, wherein said first means includes means for calculating the product of: X.sub.0 *X.sub.1 =A.sub.D.sup.2 e.sup.jα.sbsp.D +A.sub.D A.sub.I e.sup.j (ω.sbsp.I.sup.-ω.sbsp.D.sup.)t+(φ.sbsp.I.sup.-.phi..sbsp.D.sup.)+α.sbsp.I.sup.! +A.sub.D A.sub.I e.sup.j (ω.sbsp.D.sup.-ω.sbsp.I.sup.)t+(φ.sbsp.D.sup.-.phi..sbsp.I.sup.)+α.sbsp.D.sup.! +A.sub.I.sup.2 e.sup.jα.sbsp.I where A D and A I are amplitude, ω D and ω I are angular carrier frequency, and φ D and φ I are the sum of initial phase and modulation phase, suffixes D and I are a desired signal and an interferer, and α D and α I are phase differences from the reference antenna element caused by θ D and θ I of: α.sub.D =2πd sin θ.sub.D /λ α.sub.I =2πd sin θ.sub.I /λ where θ D and θ I are angles of arrival of the desired signal and the interferer, d is a distance between the reference antenna element and the adjacent antenna element, and λ is a wave length of the incident signal, and wherein said second means includes means for calculating the product of: X.sub.0 *X.sub.1 =A.sub.I e.sup.-j(ω.sbsp.I.sup.t+φ.sbsp.I.sup.) A.sub.I e.sup.j(ω.sbsp.I.sup.t+φ.sbsp.I.sup.+α.sbsp.I.sup.) =A.sub.I.sup.2 e.sup.jα.sbsp.I.
Claim 17
Dependent Claim
46 words
The apparatus as claimed in claim 10, wherein said apparatus further comprises means for detecting a TDMA slot timing in accordance with the antenna output signals, and means for judging whether it is burst or an interval of bursts by using the detected TDMA slot timing.
Claim 18
Dependent Claim
45 words
The apparatus as claimed in claim 10, wherein said estimating means includes a fourth means for estimating a DOA based upon phase differences of a plurality of element pairs having the same spacing, and a fifth means for calculating spatial average of the estimated DOA.
Claim 19
Dependent Claim
44 words
The apparatus as claimed in claim 10, wherein said estimating means includes a fourth means for estimating a DOA based upon phase differences of a plurality of element pairs having different spacings, and a fifth means for calculating spatial average of the estimated DOA.
Claim 20
Dependent Claim
55 words
The apparatus as claimed in claim 10, wherein said apparatus further comprises means for adding a feedback value to the estimated DOA to produce a sum, means for delaying the sum, and means for multiplying the delayed sum by a predetermined constant to produce said feedback value, said sum being provided as the estimated DOA.
Claim 21
Independent Claim
132 words
An apparatus for controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising: means for estimating a DOA of incident signal based upon the antenna output signals; means for calculating weights with reference to the estimated DOA; means for multiplying the antenna output signals by the calculated weights, respectively; and means for summing the multiplied antenna output signals, wherein said estimating means includes means for calculating phase differences between the output signals of two of the antenna elements, means for calculating a spatial average of the calculated phase differences during burst, means for calculating a spatial average of the calculated phase differences during an interval of bursts, and means for calculating a difference between said calculated spatial averages of phase differences.
Claim 22
Independent Claim
132 words
An apparatus for controlling an array antenna having a plurality of antenna elements for providing antenna output signals by receiving TDMA burst signals, comprising: means for estimating a DOA of incident signal based upon the antenna output signals; means for calculating weights with reference to the estimated DOA; means for multiplying the antenna output signals by the calculated weights, respectively; and means for summing the multiplied antenna output signals, wherein said estimating means includes means for calculating phase differences between the output signals of two of the antenna elements, means for calculating a spatial average of the calculated phase differences during burst, means for calculating a spatial average of the calculated phase differences during an interval of bursts, and means for calculating a difference between said calculated spatial averages of phase differences.
References Cited (Backward Citations)
US5321410A
Cited
US5274386A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-12-28 | 2002-06-29 | 2002-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-28 | 2006-06-29 | 2006-12-29 | $3760.00 | Window Closed / Lapsed |
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