US4384366A
Expired / Lapsed
US
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Interference compensation system
Assignee: NTT Inc
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Filing: 1981-03-27
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Granted: 1983-05-17
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Expires: 2001-03-27
Abstract
Abstract An interference compensation system having a main antenna (1) which receives both the desired signal and the undesired interference signal I M , an auxiliary antenna (2) which receives only the interference signal I A , an amplitude-phase control circuit which modifies the amplitude and the phase of the interference signal I A from the auxiliary antenna (2) according to the control signals A+a·cos ωt, and B+a·sin ωt, to provide the output signal I VM , and a combiner (4) which combines said signals I M and I VM to provide the output signal I E which is considered to be free from the interference signal except for the very little residual component of said interference signal, where A and B change according to the difference between I M and I A , (a) and (ω) are amplitude and angular frequency of the output of the low frequency oscillator (7).
Inventors
- 👤 Toshiyuki Kaitsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:29
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12; H04B1/123; H04B1/126
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
573 words
An interference compensation system comprising a first input terminal for receiving an interference signal I A , a second input terminal for receiving a desired signal and an interference signal I M , an amplitude-phase control circuit (3) for adjusting an amplitude and phase of an interference signal I A from the first input terminal so that the amplitude and the phase of the output signal I VM of the amplitude-phase control circuit (3) are the same amplitude and the opposite phase as compared with the interference signal I M from the second input terminal, and a combiner (4) for combining the output signal I VM of the amplitude-phase control circuit (3) and the signal I M from the second input terminal to provide a compensated output signal I E substantially free from an interference signal to the output terminal (15) CHARACTERIZED IN THAT: said interference compensation system comprises; (a) an amplitude-phase control circuit (3) comprising a pair of control signal input terminals each receiving the control signals A+a·cos ωt and B+a·sin ωt, respectively, and said amplitude-phase control circuit (3) controlling the input interference signal I A so that the average length and the average direction of the output vector I VM is defined by the values A and B, and the head of the output vector I VM rotates periodically according to the values (a) and (ω), where A and B change according to the difference between I M and I A , and (a) and (ω) are the amplitude and the angular frequency of the low frequency signal superposed on the values A and B, (b) a low frequency oscillator (7,12) for providing a pair of outputs a·cos ωt and a·sin ωt having 90° phase difference with each other, (c) an envelope detector (10) connected to the output of said combiner (4) to provide the envelope level of the combined signal I E , (d) means (11) connected to the output of said envelope detector to provide the low frequency component of the envelope signal, (e) a pair of phase detectors (13a, 13b) each having two inputs, the first input of each phase detector receives the output of said means (11) in the paragraph (d), and the second input of each phase detector receives the signal having the frequency (ω) with 90° phase difference with each other from said low frequency oscillator in the paragraph (b), (f) a pair of low pass filter means (14a, 14b) each connected to the outputs of the related phase detector (13a, 13b) to prevent double frequency components (2ω), (g) a pair of voltage integrators (6a, 6b) each connected to the output of the related low pass filter means (14a, 14b) to integrate the output of the low pass filter means to provide the values A and B, respectively, (h) a pair of adders (8a, 8b) for adding the outputs A, B of said voltage integrators (6a, 6b), and the outputs a·cos ωt, a·sin ωt of said low frequency oscillator to provide A+a·cos ωt, and B+a·sin ωt, respectively, which are applied to the control input terminals, respectively, of said amplitudephase control circuit (3), and (i) a closed control loop for providing the values A+a·cos ωt, and B+a·sin ωt by said combiner (4), said envelope detector (10), said means (11), said phase detectors (13a, 13b), said low pass filter means (14a, 14b), said voltage integrators (6a, 6b), said adders (8a, 8b), and said amplitude-phase control circuit (3).
Claim 2
Dependent Claim
573 words
An interference compensation system comprising a first input terminal for receiving an interference signal I A , a second input terminal for receiving a desired signal and an interference signal I M , an amplitude-phase control circuit (3) for adjusting an amplitude and phase of an interference signal I A from the first input terminal so that the amplitude and the phase of the output signal I VM of the amplitude-phase control circuit (3) are the same amplitude and the opposite phase as compared with the interference signal I M from the second input terminal, and a combiner (4) for combining the output signal I VM of the amplitude-phase control circuit (3) and the signal I M from the second input terminal to provide a compensated output signal I E substantially free from an interference signal to the output terminal (15) CHARACTERIZED IN THAT: said interference compensation system comprises; (a) an amplitude-phase control circuit (3) comprising a pair of control signal input terminals each receiving the control signals A+a·cos ωt and B+a·sin ωt, respectively, and said amplitude-phase control circuit (3) controlling the input interference signal I A so that the average length and the average direction of the output vector I VM is defined by the values A and B, and the head of the output vector I VM rotates periodically according to the values (a) and (ω), where A and B change according to the difference between I M and I A , and (a) and (ω) are the amplitude and the angular frequency of the low frequency signal superposed on the values A and B, (b) a low frequency oscillator (7,12) for providing a pair of outputs a·cos ωt and a·sin ωt having 90° phase difference with each other, (c) an envelope detector (10) connected to the output of said combiner (4) to provide the envelope level of the combined signal I E , (d) means (11) connected to the output of said envelope detector to provide the low frequency component of the envelope signal, (e) a pair of phase detectors (13a, 13b) each having two inputs, the first input of each phase detector receives the output of said means (11) in the paragraph (d), and the second input of each phase detector receives the signal having the frequency (ω) with 90° phase difference with each other from said low frequency oscillator in the paragraph (b), (f) a pair of low pass filter means (14a, 14b) each connected to the outputs of the related phase detector (13a, 13b) to prevent double frequency components (2ω), (g) a pair of voltage integrators (6a, 6b) each connected to the output of the related low pass filter means (14a, 14b) to integrate the output of the low pass filter means to provide the values A and B, respectively, (h) a pair of adders (8a, 8b) for adding the outputs A, B of said voltage integrators (6a, 6b), and the outputs a·cos ωt, a·sin ωt of said low frequency oscillator to provide A+a·cos ωt, and B+a·sin ωt, respectively, which are applied to the control input terminals, respectively, of said amplitudephase control circuit (3), and (i) a closed control loop for providing the values A+a·cos ωt, and B+a·sin ωt by said combiner (4), said envelope detector (10), said means (11), said phase detectors (13a, 13b), said low pass filter means (14a, 14b), said voltage integrators (6a, 6b), said adders (8a, 8b), and said amplitude-phase control circuit (3).
Claim 3
Dependent Claim
59 words
An interference compensation system according to claim 1, further comprising means (49) for detecting power or amplitude of the first interference signal I A , and variable gain control means for adjusting the gain of the closed control loop so that the higher the output of said means (49) is, the smaller the gain of the control loop is.
Claim 4
Dependent Claim
52 words
An interference compensation system according to claim 1, further comprising means for adjusting the amplitude of said low frequency oscillator is provided, and means for controlling said adjusting means according to the power at the outputs of said phase detectors, or the power or amplitude of the input of said phase detectors.
Claim 5
Dependent Claim
60 words
An interference compensation system accordiang to claim 2, further comprising a rectifier(50) for rectifying the low frequency signal applied to one of said adders, a multiplicator (51) for providing the product of the output of said rectifier and the output of said means(49), and the gain of said variable gain control means is adjusted by the output of said multiplicator.
Claim 6
Dependent Claim
46 words
An interference compensation system according to claim 1, wherein said amplitude-phase control circuit comprises; (a) an input terminal(16), (b) a signal divider(17) connected to said input terminal(16), (c) a plurality of fixed phase shifters(18a,18b,18c,18d) for shifting the phase of each outputs of said signal divider (17),
Claim 7
Dependent Claim
53 words
(d) a plurality of variable attenuators each connected to the output of the related phase shifter, (e) a combiner(20) for combining the outputs of said variable attenuators, (f) an output terminal connected to the output of said combiner, a pair of control input terminals for providing the control signals to said variable attenuators.
Claim 8
Dependent Claim
53 words
(d) a plurality of variable attenuators each connected to the output of the related phase shifter, (e) a combiner(20) for combining the outputs of said variable attenuators, (f) an output terminal connected to the output of said combiner, a pair of control input terminals for providing the control signals to said variable attenuators.
Claim 9
Dependent Claim
111 words
An interference compensation system according to claim 1, wherein said amplitude-phase control circuit comprises; (a) an input terminal (16), (b) a signal divider(39) for dividing an input signal to two outputs, (c) a 90° phase shifter connected to one output of said signal divider(39), (d) a pair of modulators(40a, 40b) each connected to the outputs of the other output of said signal divider(39) and the output of said 90° phase shifter(41), (e) a combiner for combining the outputs of said modulators (40a, 40b), (f) an output terminal connected to the output of said combiner(42), and (g) a pair of control input terminals(21a, 21b) connected to the inputs of said modulators, respectively.
Claim 10
Dependent Claim
102 words
An interference compensation system according to claim 1, wherein said amplitude-phase control circuit comprises: (a) an input terminal, (b) a variable phase shifter connected to said input terminal, (c) a variable attenuator means connected to the output of said variable phase shifter, (d) an output terminal connected to the output of said variable attenuator means, and (e) a signal converter including a pair of control input terminals for providing the signals S 1 and S 2 to said variable attenuator means and said variable phase shifter wherein ##EQU6## where (A+a·cos ωt) and (B+a·sin ωt) are signals applied to the control input terminals.
Claim 11
Dependent Claim
247 words
An interference compensation system including a first input terminal for receiving an interference signal received from a signal source and having amplitude and phase direction and a second input terminal for receiving a desired signal and said interference signal received from said signal source, comprising: oscillator means for providing a first sinusoidally time varying signal and a second sinusoidally time varying signal shifted approximately ninety degrees out-of-phase with respect to said first time varying signal, first and second integrator means for respectively providing first and second D.C. voltage signals, adder means including (1) a first adder for combining said first D.C. signal and said first sinusoidally time varying signal and (2) a second adder for combining said second D.C. signal and said second sinusoidally time varying signal for providing control signals, an amplitude-phase control circuit connected to said adder means for receiving said control signals and said interference signal received by said first input terminal and including means for modifying the amplitude and phase direction of said interference signal received by said first terminal in accordance with said control signals and output means for providing said modified interference signal having the same amplitude but opposite in phase direction to the interference signal received by said second input terminal, and signal combiner means responsive to said modified interference signal provided by said amplitude-phase control circuit in combination with said interference signal received by said second input terminal for producing a combined signal substantially free from said interference signal.
Claim 12
Dependent Claim
247 words
An interference compensation system including a first input terminal for receiving an interference signal received from a signal source and having amplitude and phase direction and a second input terminal for receiving a desired signal and said interference signal received from said signal source, comprising: oscillator means for providing a first sinusoidally time varying signal and a second sinusoidally time varying signal shifted approximately ninety degrees out-of-phase with respect to said first time varying signal, first and second integrator means for respectively providing first and second D.C. voltage signals, adder means including (1) a first adder for combining said first D.C. signal and said first sinusoidally time varying signal and (2) a second adder for combining said second D.C. signal and said second sinusoidally time varying signal for providing control signals, an amplitude-phase control circuit connected to said adder means for receiving said control signals and said interference signal received by said first input terminal and including means for modifying the amplitude and phase direction of said interference signal received by said first terminal in accordance with said control signals and output means for providing said modified interference signal having the same amplitude but opposite in phase direction to the interference signal received by said second input terminal, and signal combiner means responsive to said modified interference signal provided by said amplitude-phase control circuit in combination with said interference signal received by said second input terminal for producing a combined signal substantially free from said interference signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |