DIGITAL REPEATER HAVING BANDPASS FILTERING, ADAPTIVE PRE-EQUALIZATION AND SUPPRESSION OF NATURAL OSCILLATION
First Claim
1. A signal repeating system, comprising:
- at least one input antenna that receives input signals, at least one output antenna that radiates output signals, and a signal path between the input and output antennas;
the signal path including;
down conversion circuitry that converts input signals to lower frequency signals and analog-to-digital conversion circuitry that converts the input signals to digital signals;
a suppression circuit for suppressing feedback and interference in the repeated output signals, the suppression circuit including;
a digital signal processor configured for receiving samples of the input signals, samples of the output signals, and samples of an interference reference signal;
an adaptive filter coupled with the digital signal processor, the adaptive filter configured, under the control of the digital signal processor, for generating cancellation signals;
the digital signal processor configured for computing a correlation between the input signals and output signals and creating control signals for the adaptive filter to generate echo cancellation signals;
the digital signal processor further configured for computing a correlation between the interference reference signal and the output signals and creating control signals for the adaptive filter to generate interference cancellation signals;
combining circuitry for destructively adding the echo cancellation signals and the interference cancellation signals to the input signals for reducing echo and interference in the output signals of the signal repeating system;
digital-to-analog conversion circuitry that converts the output signals to analog signals and up conversion circuitry that converts output signals to higher frequency signals.
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Accused Products
Abstract
A signal repeating system includes at least one input antenna that receives input signals, at least one output antenna that radiates output signals, and a signal path between the input and output antennas. The signal path includes circuitry for conditioning the input signals with down conversion circuitry that converts input signals to lower frequency signals and analog-to-digital conversion circuitry that converts the input signals to digital signals. A suppression circuit suppresses feedback and interference in the repeated output signals with a digital signal processor configured for receiving samples of the input signals, samples of the output signals, and samples of an interference reference signal and an adaptive filter under the control of the digital signal processor for generating echo cancellation signals and interference cancellation signals.
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Citations
16 Claims
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1. A signal repeating system, comprising:
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at least one input antenna that receives input signals, at least one output antenna that radiates output signals, and a signal path between the input and output antennas; the signal path including; down conversion circuitry that converts input signals to lower frequency signals and analog-to-digital conversion circuitry that converts the input signals to digital signals; a suppression circuit for suppressing feedback and interference in the repeated output signals, the suppression circuit including; a digital signal processor configured for receiving samples of the input signals, samples of the output signals, and samples of an interference reference signal; an adaptive filter coupled with the digital signal processor, the adaptive filter configured, under the control of the digital signal processor, for generating cancellation signals; the digital signal processor configured for computing a correlation between the input signals and output signals and creating control signals for the adaptive filter to generate echo cancellation signals; the digital signal processor further configured for computing a correlation between the interference reference signal and the output signals and creating control signals for the adaptive filter to generate interference cancellation signals; combining circuitry for destructively adding the echo cancellation signals and the interference cancellation signals to the input signals for reducing echo and interference in the output signals of the signal repeating system; digital-to-analog conversion circuitry that converts the output signals to analog signals and up conversion circuitry that converts output signals to higher frequency signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for conditioning a signal in a signal repeating system, comprising:
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receiving input signals, conditioning the signals in a signal path and transmitting the output signals; the step of conditioning the input signals including; down converting the signals to lower frequency signals and converting the input signals to digital signals; suppressing feedback and interference in the repeated output signals, including; processing, with a digital signal processor, samples of the input signals, samples of the output signals, and samples of an interference reference signal; generating cancellation signals with an adaptive filter under the control of the digital signal processor using the sampled input and output signals and interference reference signal; the generation of the cancellation signals including at least one of; computing a correlation between the input signals and output signals and creating control signals for the adaptive filter to generate echo cancellation signals, or computing a correlation between the interference reference signal and the output signals and creating control signals for the adaptive filter to generate interference cancellation signals; destructively adding at least one of the echo cancellation signals and the interference cancellation signals to the input signals for reducing at least one of echo or interference in the output signals of the signal repeating system; converting the output signals to analog signals and up converting the output signals to higher frequency signals to be transmitted. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification