System and method for determining and controlling gain margin in an RF repeater
First Claim
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1. An apparatus for repeating signals, the apparatus comprising:
- a receive antenna for capturing a receive signal that includes an input signal and a feedback signal;
processing circuitry coupled with the receive antenna for processing the receive signal to form a repeated signal;
a transmit antenna coupled with the processing circuitry for transmitting the repeated signal;
the processing circuitry for processing the receive signal including;
gain circuitry to provide gain in the repeated signal;
decorrelation circuitry including frequency shifting circuitry that is configured for decorrelating the input signal of the receive signal and the repeated signal by introducing a frequency shift in the repeated signal to form the repeated signal that is decorellated and frequency-shifted from the input signal of the receive signal;
gain margin circuitry configured for calculating a gain margin for the apparatus by utilizing samples of the decorrelated receive signal and the frequency-shifted repeated signal and utilizing samples of the repeated signal wherein the frequency shift that is used to decorrelate the receive and repeated signals has been removed.
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Abstract
An apparatus for repeating signals includes a receive antenna for capturing a receive signal, processing circuitry for processing the receive signal to form a repeated signal, and a transmit antenna for transmitting the repeated signal. The processing circuitry includes gain circuitry for gain in the repeated signal and decorrelation circuitry configured for modifying the repeated signal with respect to the receive signal to thereby decorrelate the repeated signal from the receive signal. The processing circuitry further comprises circuitry configured for calculating a gain margin for the apparatus utilizing the decorrelated receive and repeated signals.
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Citations
58 Claims
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1. An apparatus for repeating signals, the apparatus comprising:
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a receive antenna for capturing a receive signal that includes an input signal and a feedback signal; processing circuitry coupled with the receive antenna for processing the receive signal to form a repeated signal; a transmit antenna coupled with the processing circuitry for transmitting the repeated signal; the processing circuitry for processing the receive signal including; gain circuitry to provide gain in the repeated signal; decorrelation circuitry including frequency shifting circuitry that is configured for decorrelating the input signal of the receive signal and the repeated signal by introducing a frequency shift in the repeated signal to form the repeated signal that is decorellated and frequency-shifted from the input signal of the receive signal; gain margin circuitry configured for calculating a gain margin for the apparatus by utilizing samples of the decorrelated receive signal and the frequency-shifted repeated signal and utilizing samples of the repeated signal wherein the frequency shift that is used to decorrelate the receive and repeated signals has been removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for repeating signals comprising:
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capturing a receive signal with a receive antenna, the receive signal including an input signal and a feedback signal; processing the receive signal with processing circuitry to form a repeated signal; transmitting the repeated signal; the processing steps including; providing gain in the repeated signal; decorrelating the input signal of the receive signal and the repeated signal by introducing a frequency shift in the repeated signal to form the repeated signal that is decorrelated and frequency-shifted from the input signal of the receive signal; calculating a gain margin for the apparatus by utilizing samples of the decorrelated receive signal and the frequency-shifted repeated signal and utilizing samples of the repeated signal wherein the frequency shift that is used to decorrelate the receive and repeated signals has been removed. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for repeating signals, the apparatus comprising:
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a receive antenna configured to capture a receive signal; a transmit antenna configured to transmit a repeated signal formed from the receive signal; gain circuitry configured to provide gain in the repeated signal; decorrelation circuitry configured to modify the repeated signal and including frequency shifting circuitry operable to create a frequency shift in the repeated signal with respect to the receive signal, wherein the repeated signal is frequency shifted and decorrelated from the receive signal; and gain margin circuitry configured to calculate a gain margin for the apparatus utilizing the decorrelated receive and repeated signals, the gain margin circuitry utilizing a repeated signal that is shifted in frequency by the negative of the frequency shift used to decorrelate the receive and repeated signal. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for repeating signals comprising:
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capturing a receive signal; transmitting a repeated signal formed from the receive signal; providing gain in the repeated signal; modifying the repeated signal by creating a frequency shift in the repeated signal with respect to the receive signal, wherein the repeated signal is frequency shifted and decorrelated from the receive signal; calculating a gain margin for the apparatus utilizing the decorrelated receive and repeated signals and utilizing a repeated signal that is shifted in frequency by the negative of the frequency shift used to decorrelate the receive signal and repeated signal. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
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46. An apparatus for repeating signals, the apparatus comprising:
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a receive input to couple the apparatus to a receive antenna, wherein the receive antenna is configured to capture a receive signal, wherein the receive input is configured to obtain the receive signal from the receive antenna; a transmit output to couple the apparatus to a transmit antenna, wherein the transmit output is configured to provide a repeated signal formed from the receive signal to the transmit antenna, wherein the transmit antenna is configured to transmit the repeated signal; gain circuitry configured to provide gain in the repeated signal; decorrelation circuitry configured to modify the repeated signal and including frequency shifting circuitry operable to create a frequency shift in the repeated signal with respect to the receive signal, wherein the repeated signal is frequency shifted and decorrelated from the receive signal; and gain margin circuitry configured to calculate a gain margin for the apparatus utilizing the decorrelated receive and repeated signals, the gain margin circuitry utilizing a repeated signal that is shifted in frequency by the negative of the frequency shift used to decorrelate the receive and repeated signal. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification