US4797950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multipath reduction system
Assignee: Individual
•
Filing: 1987-10-02
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Granted: 1989-01-10
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Expires: 2007-10-02
Abstract
Abstract The effects of multipath and other interference signals in communication receivers are reduced by implementing an adaptive array. The invention addresses a signal environment in which the directions of arrival and the time of arrival of the signal of interest and the unwanted multipath or interference signals are unknown. The feedback equation of the LMS adaptive array is changed so that a reference signal is not needed. The system uses the strongest received signal as the signal of interest and rejects the other received signals.
Inventors
- 👤 Kenneth Rilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:04
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12; H04B1/123; H04B1/126; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; H01Q3/2611; H01Q3/2617
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
170 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 2
Dependent Claim
170 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 3
Dependent Claim
20 words
A system as in claim 1 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 4
Dependent Claim
146 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means coupled to receive the said adaptive array output signal for generating an amplitude limited adaptive array output signal as the feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 5
Dependent Claim
146 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means coupled to receive the said adaptive array output signal for generating an amplitude limited adaptive array output signal as the feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 6
Dependent Claim
20 words
A system as in claim 3 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 7
Dependent Claim
123 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal and feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 8
Dependent Claim
123 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal and feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 9
Dependent Claim
20 words
A system as in claim 5 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 10
Dependent Claim
184 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 11
Dependent Claim
184 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 12
Dependent Claim
19 words
A system in claim 7 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 13
Dependent Claim
160 words
A signal processing signal for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means coupled to receive the said adaptive array output signal for generating an amplitude limited adaptive array output signal as the feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 14
Dependent Claim
160 words
A signal processing signal for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means coupled to receive the said adaptive array output signal for generating an amplitude limited adaptive array output signal as the feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 15
Dependent Claim
20 words
A system as in claim 9 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 16
Dependent Claim
137 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal and feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 17
Dependent Claim
137 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal and feedback signal; said adaptive array means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 18
Dependent Claim
20 words
A system as in claim 11 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 19
Dependent Claim
168 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal; envelope detector means coupled to receive said adaptive filter output signal for generating the amplitude envelope of said adaptive filter output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive filter output signal for generating a feedback signal; said adaptive filter means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 20
Dependent Claim
168 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal; envelope detector means coupled to receive said adaptive filter output signal for generating the amplitude envelope of said adaptive filter output signal; and first multiplier means coupled to receive the envelope detector means output signal and coupled to receive the adaptive filter output signal for generating a feedback signal; said adaptive filter means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 21
Dependent Claim
20 words
A system as in claim 13 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 22
Dependent Claim
144 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal; and amplitude limiter means coupled to receive the said adaptive filter output signal for generating an amplitude limited adaptive filter output signal as the feedback signal; said adaptive filter means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 23
Dependent Claim
144 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal; and amplitude limiter means coupled to receive the said adaptive filter output signal for generating an amplitude limited adaptive filter output signal as the feedback signal; said adaptive filter means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 24
Dependent Claim
20 words
A system as in claim 15 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 25
Dependent Claim
121 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal and feedback signal; said adaptive filter means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 26
Dependent Claim
121 words
A signal processing system for reducing distortion effects due to multiple signal images, said system comprising: adaptive filter means having: one input signal element; weighting means coupled to the antenna element for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive filter output signal and feedback signal; said adaptive filter means also including a multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefine the weight factors.
Claim 27
Dependent Claim
20 words
A system as in claim 17 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 28
Dependent Claim
227 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; DC source means for supplying a DC signal; divider means coupled to receive envelope detector means output signal and coupled to receive DC source means output signal which divides envelope detector means output signal by DC source means output signal; logarithm device means coupled to receive divider means output signal for generating the logarithm of divider means output signal; and first multiplier means coupled to receive logarithm means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 29
Dependent Claim
227 words
A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; DC source means for supplying a DC signal; divider means coupled to receive envelope detector means output signal and coupled to receive DC source means output signal which divides envelope detector means output signal by DC source means output signal; logarithm device means coupled to receive divider means output signal for generating the logarithm of divider means output signal; and first multiplier means coupled to receive logarithm means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 30
Dependent Claim
20 words
A system as in claim 19 further includes a phase adjustment means for adjusting the phase of the feedback signal.
Claim 31
Dependent Claim
241 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; DC source means for supplying a DC signal; divider means coupled to receive envelope detector means output signal and coupled to receive DC source means output signal which divides envelope detector means output signal by DC source means output signal; logarithm device means coupled to receive divider means output signal for generating the logarithm of divider means output signal; and first multiplier means coupled to receive logarithm means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 32
Dependent Claim
241 words
A signal processing system for reducing distortion effects in communication receivers due to interference signals with signal amplitudes less than the signal amplitude of the signal of interest, said system comprising: adaptive array means having: at least two antenna elements; weighting means coupled to the antenna elements for selectively weighting the received signals by a selected weight factor; and summing means for adding together the signals from the weighting means for generating an adaptive array output signal; envelope detector means coupled to receive said adaptive array output signal for generating the amplitude envelope of said adaptive array output signal; DC source means for supplying a DC signal; divider means coupled to receive envelope detector means output signal and coupled to receive DC source means output signal which divides envelope detector means output signal by DC source means output signal; logarithm device means coupled to receive divider means output signal for generating the logarithm of divider means output signal; and first multiplier means coupled to receive logarithm means output signal and coupled to receive the adaptive array output signal for generating a feedback signal; said adaptive array means also including a second multiplier means for each weighting means coupled to receive the feedback signal and coupled to receive the corresponding weighting means input signal, the output signal of which is coupled to a corresponding integrator means whose output signal is coupled to the corresponding weighting means for automatically redefining the weight factors.
Claim 33
Dependent Claim
20 words
A system as in claim 21 further includes a phase adjustment means for adjusting the phase of the feedback signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |