US4752969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-multipath signal processor
Assignee: Individual
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Filing: 1986-01-16
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Granted: 1988-06-21
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Expires: 2006-01-16
Abstract
Abstract Signal processing that reduces multipath in communication receivers is implemented with an adaptive array. The invention address a signal environment in which the directions of arrival and the time of arrival of the signal of interest and the unwanted multipath are unknown. A reference signal is generated by amplitude limiting the adaptive array output signal. The system uses the strongest received signal as the signal of interest and rejects the others by placing an antenna pattern null in their direction of arrival.
Inventors
- 👤 Kenneth Rilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
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; H03; H03H; H03H21/00; H03H21/0012
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
120 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said adaptive array means also including a means coupled to receive the reference signal and the adaptive array output signal for generating weight values to be applied to the weighting means to automatically redefine the weight factors.
Claim 2
Dependent Claim
120 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said adaptive array means also including a means coupled to receive the reference signal and the adaptive array output signal for generating weight values to be applied to the weighting means to automatically redefine 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 reference signal.
Claim 4
Dependent Claim
29 words
A system as in claim 1 wherein said means for generating the weight values includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 5
Dependent Claim
29 words
A system as in claim 2 wherein said means for generating the weight values includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 6
Dependent Claim
26 words
A system as in claim 1 further includes a second summing means for adding together the signals from the weighting means for generating the reference signal.
Claim 7
Dependent Claim
120 words
A signal processing system for reducing distortion effects in communication receivers due to LMS 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said LMS adaptive array means also including a subtractor means coupled to receive the reference signal and the adaptive array output signal for generating an error signal to be applied to the weighting means to automatically redefine the weight factors.
Claim 8
Dependent Claim
120 words
A signal processing system for reducing distortion effects in communication receivers due to LMS 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said LMS adaptive array means also including a subtractor means coupled to receive the reference signal and the adaptive array output signal for generating an error signal to be applied to the weighting means to automatically redefine the weight factors.
Claim 9
Dependent Claim
20 words
A system as in claim 6 further includes a phase adjustment means for adjusting the phase of the reference signal.
Claim 10
Dependent Claim
20 words
A system as in claim 6 further includes a phase adjustment means for adjusting the phase of the error signal.
Claim 11
Dependent Claim
23 words
A system as in claim 7 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the error signal
Claim 12
Dependent Claim
25 words
A system as in claim 6 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 13
Dependent Claim
25 words
A system as in claim 7 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 14
Dependent Claim
25 words
A system as in claim 8 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 15
Dependent Claim
25 words
A system as in claim 9 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 16
Dependent Claim
26 words
A system as in claim 6 further includes a second summing means for adding together the signals from selected weighting means for generating the reference signal.
Claim 17
Dependent Claim
136 words
A signal processing system for reducing distortion effects in communication receivers due to an interference signal with a signal amplitude 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said adaptive array means also including a means coupled to receive the reference signal and the adaptive array output signal for generating weight values to be applied to the weighting means to automatically redefine the weight factors.
Claim 18
Dependent Claim
136 words
A signal processing system for reducing distortion effects in communication receivers due to an interference signal with a signal amplitude 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said adaptive array means also including a means coupled to receive the reference signal and the adaptive array output signal for generating weight values to be applied to the weighting means to automatically redefine the weight factors.
Claim 19
Dependent Claim
20 words
A system as in claim 15 further includes a phase adjustment means for adjusting the phase of the reference signal.
Claim 20
Dependent Claim
29 words
A system as in claim 15 wherein said means for generating the weight values includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 21
Dependent Claim
29 words
A system as in claim 16 wherein said means for generating the weight values includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 22
Dependent Claim
140 words
A signal processing system for reducing distortion effects in communication receivers due to an interference signal with a signal amplitude less than the signal amplitude of the signal of interest, said system comprising: LMS 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said LMS adaptive array means also including a subtractor means coupled to receive the reference signal and the adaptive array output signal for generating an error signal to be applied to the weighting means to automatically redefine the weight factors.
Claim 23
Dependent Claim
140 words
A signal processing system for reducing distortion effects in communication receivers due to an interference signal with a signal amplitude less than the signal amplitude of the signal of interest, said system comprising: LMS 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 first summing means for adding together the signals from the weighting means for generating an adaptive array output signal; and amplitude limiter means having as an input signal said adaptive array output signal for generating a reference signal; said LMS adaptive array means also including a subtractor means coupled to receive the reference signal and the adaptive array output signal for generating an error signal to be applied to the weighting means to automatically redefine the weight factors.
Claim 24
Dependent Claim
24 words
A system as in claim 19 wherein said amplitude limiter means includes a phase adjustment means for adjusting the phase of the reference signal.
Claim 25
Dependent Claim
20 words
A system as in claim 19 further includes a phase adjustment means for adjusting the phase of the error signal.
Claim 26
Dependent Claim
23 words
A system as in claim 20 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the error signal.
Claim 27
Dependent Claim
25 words
A system as in claim 19 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 28
Dependent Claim
25 words
A system as in claim 20 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 29
Dependent Claim
25 words
A system as in claim 21 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 30
Dependent Claim
25 words
A system as in claim 22 wherein said subtractor means includes a phase adjustment means for adjusting the phase of the adaptive array output signal.
Claim 31
Dependent Claim
26 words
A system as in claim 15 further includes a second summing means for adding together the signals from selected weighting means for generating the reference signal.
Claim 32
Dependent Claim
30 words
A system as in claim 19 wherein said amplitude limiter means includes a second summing means for adding together the signals from selected weighting means for generating the reference 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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |