Anti-multipath signal processor
First Claim
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1. 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.
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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.
75 Citations
28 Claims
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1. A signal processing system for reducing distortion effects in communication receivers due to multipath, said system comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. 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. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. 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:
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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. - View Dependent Claims (16, 17, 18, 27)
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19. 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:
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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. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 28)
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Specification