On frequency repeater with AGC stability determination
First Claim
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1. An on frequency repeater for a wireless network, comprising:
- a first antenna that is directed toward a first selected location in the wireless network to receive RF signals from said first selected location;
an amplification chain coupled to the received signal and amplifying the level of the received signal to generate an amplified RF signal;
a second antenna spaced apart from the first antenna and receiving and transmitting the amplified RF signal to a second location in the wireless network; and
a feedback oscillation detection circuit coupled to the amplification chain in a gain control loop including a gain adjustment circuit and a gain control circuit, the feedback oscillation detection circuit detecting a saw tooth waveform in the gain control loop to detect onset of feedback oscillation between the first and second antennas.
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Abstract
An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteristic saw tooth pattern in the gain control loop indicating feedback oscillation is detected. A nonlinear gain expander circuit may be periodically activated to allow feedback oscillation detection in repeater applications employing linearized amplifiers.
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Citations
20 Claims
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1. An on frequency repeater for a wireless network, comprising:
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a first antenna that is directed toward a first selected location in the wireless network to receive RF signals from said first selected location; an amplification chain coupled to the received signal and amplifying the level of the received signal to generate an amplified RF signal; a second antenna spaced apart from the first antenna and receiving and transmitting the amplified RF signal to a second location in the wireless network; and a feedback oscillation detection circuit coupled to the amplification chain in a gain control loop including a gain adjustment circuit and a gain control circuit, the feedback oscillation detection circuit detecting a saw tooth waveform in the gain control loop to detect onset of feedback oscillation between the first and second antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An on frequency repeater for a wireless network, comprising:
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a first antenna that is directed toward a first selected location in the wireless network to receive RF signals from said first selected location; an amplification chain coupled to the received signal and amplifying the level of the received signal to generate an amplified RF signal; a nonlinear gain expander circuit coupled in the signal path of the amplification chain; a second antenna spaced apart from the first antenna and receiving and transmitting the amplified RF signal to a second location in the wireless network; and a feedback oscillation detection circuit coupled to the amplification chain in a gain control loop including a gain adjustment circuit and a gain control circuit, wherein the feedback oscillation detection circuit is coupled to control the gain expander circuit to selectively provide a nonlinear gain response, the feedback oscillation detection circuit detecting a saw tooth waveform in the gain control loop to detect onset of feedback oscillation between the first and second antennas during operation of the gain expander circuit. - View Dependent Claims (13, 14)
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15. A method for detecting feedback oscillation in a repeater having first and second antennas and one or more amplification paths, comprising:
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detecting a signal level in said amplification path; controlling the gain of the amplification path in response to said detected signal level with a gain control signal; and detecting a periodic nonlinear pattern in the gain control signal signaling onset of feedback oscillation between the antennas. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification