CROSS-POLARIZATION INTERFERENCE COMPENSATION APPARATUS, CROSS-POLARIZATION INTERFERENCE COMPENSATION METHOD, AND PROGRAM
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
공개
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국제특허분류(IPC7판) |
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출원번호 |
US-0640716
(2011-04-13)
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공개번호 |
US-0065547
(2013-03-14)
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우선권정보 |
JP-2010-093993 (2010-04-15) |
국제출원번호 |
PCT/JP2011/059161
(2011-04-13)
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§371/§102 date |
20121105
(20121105)
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발명자
/ 주소 |
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
Even when transmitters of both polarizations in an opposing station apparatus output different signals, cross-polarization interference is compensated for. A cross-polarization interference compensation apparatus includes a main signal reception unit which receives a signal having a first polarizati
Even when transmitters of both polarizations in an opposing station apparatus output different signals, cross-polarization interference is compensated for. A cross-polarization interference compensation apparatus includes a main signal reception unit which receives a signal having a first polarization direction, an interference signal reception unit which receives a signal having a second polarization direction crossing the first polarization direction, a phase control unit which controls a phase of the signal received by the interference signal reception unit, an interference compensation signal generation unit which generates an interference compensation signal by performing weighted combination on a time series of a signal output by the phase control unit, and setting weighting coefficients used for the weighted combination so that the interference compensation signal becomes a cross-polarization interference component of the signal received by the main signal reception unit, a phase estimation unit which estimates a phase difference between the signal received by the main signal reception unit and the signal received by the interference signal reception unit using information on the weighting coefficients, and a compensation unit which compensates the signal having the first polarization direction for cross-polarization interference caused by the signal having the second polarization direction using the interference compensation signal and the signal received by the main signal reception unit, in which the phase control unit controls the phase of the signal received by the interference signal reception unit using the phase difference estimated by the phase estimation unit so that a phase of the signal received by the main signal reception unit and the phase of the signal received by the interference signal reception unit become identical.
대표청구항
▼
1. A cross-polarization interference compensation apparatus comprising: a main signal reception unit which receives a signal having a first polarization direction;an interference signal reception unit which receives a signal having a second polarization direction crossing the first polarization dire
1. A cross-polarization interference compensation apparatus comprising: a main signal reception unit which receives a signal having a first polarization direction;an interference signal reception unit which receives a signal having a second polarization direction crossing the first polarization direction;a phase control unit which controls a phase of the signal received by the interference signal reception unit;an interference compensation signal generation unit which generates an interference compensation signal by performing weighted combination on a time series of a signal output by the phase control unit, and setting weighting coefficients used for the weighted combination so that the interference compensation signal becomes a cross-polarization interference component of the signal received by the main signal reception unit;a phase estimation unit which estimates a phase difference between the signal received by the main signal reception unit and the signal received by the interference signal reception unit using information on the weighting coefficients; anda compensation unit which compensates the signal having the first polarization direction for cross-polarization interference caused by the signal having the second polarization direction using the interference compensation signal and the signal received by the main signal reception unit,wherein the phase control unit controls the phase of the signal received by the interference signal reception unit using the phase difference estimated by the phase estimation unit so that a phase of the signal received by the main signal reception unit and the phase of the signal received by the interference signal reception unit become identical. 2. The cross-polarization interference compensation apparatus according to claim 1, wherein the weighting coefficients comprise filter coefficients, the interference compensation signal generation unit comprises a filter which includes: a plurality of delay units which are concatenated and delay the signal output by the phase control unit; a plurality of multiplication units which multiply the signal output by the phase control unit and signals output by the delay units by the filter coefficients; an addition unit which adds signals output by the multiplication units; and a filter coefficient deriving unit which derives the filter coefficients,the phase estimation unit identifies a multiplication unit which uses a filter coefficient having a largest absolute value among the filter coefficients derived by the filter coefficient deriving unit, andthe information on the weighting coefficients comprises information on the multiplication unit identified by the phase estimation unit. 3. The cross-polarization interference compensation apparatus according to claim 2, wherein the phase estimation unit estimates that the more the identified multiplication unit is disposed closer to the phase control unit, the more a signal output by the addition unit is delayed relative to the signal received by the interference signal reception unit, and estimates that the farther the identified multiplication unit is disposed away from the phase control unit, the more the signal received by the interference signal reception unit is delayed relative to the signal output by the addition unit. 4. The cross-polarization interference compensation apparatus according to claim 1, wherein the phase control unit includes:a plurality of phase control delay units which delay the signal received by the interference signal reception unit;a plurality of phase control multiplication units which multiply the signal received by the interference signal reception unit and signals output by the phase control delay units by phase control coefficients;a phase control addition unit which adds signals output by the phase control multiplication units; anda phase control coefficient deriving unit which derives the phase control coefficients used by the phase control multiplication units so that a phase of a signal output by the phase control addition unit and a phase of a cross-polarization interference component of the signal received by the main signal reception unit become identical. 5. The cross-polarization interference compensation apparatus according to claim 1, further comprising a sampling frequency change unit which increases a sampling frequency of the signal received by the interference signal reception unit so that a time interval of sample values of the signal input to the phase control unit is reduced. 6. The cross-polarization interference compensation apparatus according to claim 1, wherein the phase control unit performs interpolation of the signal output from the interference signal reception unit to estimate a signal at a time that is not sampled by the interference signal reception unit. 7. The cross-polarization interference compensation apparatus according to claim 6, wherein the interpolation comprises linear interpolation or high-order Lagrange interpolation. 8. A cross-polarization interference compensation method comprising: receiving a first signal having a first polarization direction;receiving a second signal having a second polarization direction crossing the first polarization direction;controlling a phase of the second signal in accordance with a phase control signal;generating an interference compensation signal by performing weighted combination on a time-series of a signal whose phase has been controlled, and setting weighting coefficients used for the weighted combination so that the interference compensation signal becomes a cross-polarization interference component of the first signal;estimating a phase difference between the first signal and the second signal using information on the weighting coefficients;generating the phase control signal using the estimated phase difference so that a phase of the first signal and the phase of the second signal become identical; andcompensating the first signal for cross-polarization interference caused by the second signal using the interference compensation signal and the first signal. 9. A program for causing a computer of a cross-polarization interference compensation apparatus to function as: a main signal reception unit which receives a signal having a first polarization direction;an interference signal reception unit which receives a signal having a second polarization direction crossing the first polarization direction;a phase control unit which controls a phase of the signal received by the interference signal reception unit;an interference compensation signal generation unit which generate an interference compensation signal by performing weighted combination on a time series of a signal output by the phase control unit, and setting weighting coefficients used for the weighted combination so that the interference compensation signal becomes a cross-polarization interference component of the signal received by the main signal reception unit;a phase estimation unit which estimates a phase difference between the signal received by the main signal reception unit and the signal received by the interference signal reception unit using information on the weighting coefficients; anda compensation unit which compensates the signal having the first polarization direction for cross-polarization interference caused by the signal having the second polarization direction using the interference compensation signal and the signal received by the main signal reception unit, andcausing the computer to operate so that the phase control unit controls the phase of the signal output by the interference signal reception unit using the phase difference estimated by the phase estimation unit, and a phase of the signal received by the main signal reception unit and the phase of the signal received by the interference signal reception unit become identical. 10. The cross-polarization interference compensation apparatus according to claim 2, wherein the phase control unit includes:a plurality of phase control delay units which delay the signal received by the interference signal reception unit;a plurality of phase control multiplication units which multiply the signal received by the interference signal reception unit and signals output by the phase control delay units by phase control coefficients;a phase control addition unit which adds signals output by the phase control multiplication units; anda phase control coefficient deriving unit which derives the phase control coefficients used by the phase control multiplication units so that a phase of a signal output by the phase control addition unit and a phase of a cross-polarization interference component of the signal received by the main signal reception unit become identical. 11. The cross-polarization interference compensation apparatus according to claim 2, further comprising a sampling frequency change unit which increases a sampling frequency of the signal received by the interference signal reception unit so that a time interval of sample values of the signal input to the phase control unit is reduced. 12. The cross-polarization interference compensation apparatus according to claim 2, wherein the phase control unit performs interpolation of the signal output from the interference signal reception unit to estimate a signal at a time that is not sampled by the interference signal reception unit. 13. The cross-polarization interference compensation apparatus according to claim 12, wherein the interpolation comprises linear interpolation or high-order Lagrange interpolation. 14. The cross-polarization interference compensation apparatus according to claim 3, wherein the phase control unit includes:a plurality of phase control delay units which delay the signal received by the interference signal reception unit;a plurality of phase control multiplication units which multiply the signal received by the interference signal reception unit and signals output by the phase control delay units by phase control coefficients;a phase control addition unit which adds signals output by the phase control multiplication units; anda phase control coefficient deriving unit which derives the phase control coefficients used by the phase control multiplication units so that a phase of a signal output by the phase control addition unit and a phase of a cross-polarization interference component of the signal received by the main signal reception unit become identical. 15. The cross-polarization interference compensation apparatus according to claim 3, further comprising a sampling frequency change unit which increases a sampling frequency of the signal received by the interference signal reception unit so that a time interval of sample values of the signal input to the phase control unit is reduced. 16. The cross-polarization interference compensation apparatus according to claim 3, wherein the phase control unit performs interpolation of the signal output from the interference signal reception unit to estimate a signal at a time that is not sampled by the interference signal reception unit. 17. The cross-polarization interference compensation apparatus according to claim 16, wherein the interpolation comprises linear interpolation or high-order Lagrange interpolation. 18. The cross-polarization interference compensation apparatus according to claim 4, further comprising a sampling frequency change unit which increases a sampling frequency of the signal received by the interference signal reception unit so that a time interval of sample values of the signal input to the phase control unit is reduced. 19. The cross-polarization interference compensation apparatus according to claim 4, wherein the phase control unit performs interpolation of the signal output from the interference signal reception unit to estimate a signal at a time that is not sampled by the interference signal reception unit. 20. The cross-polarization interference compensation apparatus according to claim 19, wherein the interpolation comprises linear interpolation or high-order Lagrange interpolation.
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