Physical Layer Repeater Utilizing Real Time Measurement Metrics and Adaptive Antenna Array to Promote Signal Integrity and Amplification
First Claim
1. A repeater for a wireless communication network, the repeater operative to provide feedback cancellation, the repeater comprising:
- an antenna array comprising one or more antenna elements; and
an equalized feedback cancellation loop operatively coupled to the antenna array, and configured to operate on input signals to derive a metric that is employed to increase signal isolation and signal gain,wherein the metric is indicative of level of a transmitter signal present at a receiver, and is a function of correlation between a transmitted signal and a received signal including a desired receiver signal, andwherein the repeater has a delay that allows the transmitted signal to be de-correlated with the desired receiver signal, the transmitted signal is time aligned, and the transmitted signal is correlated with a feedback leakage signal.
1 Assignment
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Accused Products
Abstract
Embodiments of a repeater environment can be operative to deploy a feedback cancellation loop that is adaptively coupled with an antenna array such that a selected metric can be applied to the antenna array and feedback cancellation loop combination to improve signal integrity and amplification. Illustratively, the feedback cancellation loop of the exemplary repeater can be adapted by a metric that operatively adapts weights provided by performing a selected linear algebra technique to the feedback cancellation loop such that the metric can be indicative of the level of transmitter signal present at a receive and can be derived based on performing a correlation between the transmitted signal and the receiver signal. Further, operatively, the exemplary repeater can maintain a delay sufficient to preferably ensure that transmitted signal is de-correlated with the desired receiver signal, and time aligned and correlated with the feedback leakage signal.
53 Citations
38 Claims
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1. A repeater for a wireless communication network, the repeater operative to provide feedback cancellation, the repeater comprising:
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an antenna array comprising one or more antenna elements; and an equalized feedback cancellation loop operatively coupled to the antenna array, and configured to operate on input signals to derive a metric that is employed to increase signal isolation and signal gain, wherein the metric is indicative of level of a transmitter signal present at a receiver, and is a function of correlation between a transmitted signal and a received signal including a desired receiver signal, and wherein the repeater has a delay that allows the transmitted signal to be de-correlated with the desired receiver signal, the transmitted signal is time aligned, and the transmitted signal is correlated with a feedback leakage signal. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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5. The repeater as recited in claim 5, wherein the repeater is configured to perform feedback cancellation by performing one or more operations selected from the group consisting of using a beam former, calculating weights for application with the metric using a closed form solution using input and output signal samples, and determining a performance of feedback cancellation using a correlation metric.
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19. A method to facilitate feedback loop cancelation in a repeater environment comprising:
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receiving repeater transmitter leakage signal and receive signal at M number of receivers; applying M number of complex spatial receive weights on the M number of receivers to generate weighted receiver signals; combining the weighted receiver signals to generate a composite weighted signal; providing a selected time delay to the post cancellation leakage signal used to de-correlate the receive signal from the transmitter leakage signal to generate a de-correlated transmit signal; generating new receiver and transmitter complex spatial weights using an adaptive algorithm utilizing a correlation metric and a selected convergence time; and transmitting N number of weighted repeater signals by N transmitters. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method to facilitate feedback loop cancelation in a repeater environment comprising:
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receiving repeater transmitter leakage signal and receive signal at a receiver to classify as a composite receive signal; generating a post cancellation receive signal by a leakage cancellation block; providing a selected time delay to the post cancellation leakage signal used to de-correlate the receive signal from the transmitter leakage signal to generate a de-correlated transmit signal; and transmit the de-correlated transmit signal. - View Dependent Claims (27, 28, 29, 30)
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31. A computer readable medium having stored thereon computer executable instructions for performing at least the following acts:
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receiving repeater transmitter leakage signal and receive signal at M number of receivers; applying M number of complex spatial receive weights on the M number of receivers to generate weighted receiver signals; combining the weighted receiver signals to generate a composite weighted signal; providing a selected time delay to the post cancellation leakage signal used to de-correlate the receive signal from the transmitter leakage signal to generate a de-correlated transmit signal; generating new receiver and transmitter complex spatial weights using an adaptive algorithm utilizing a correlation metric and a selected convergence time; and transmitting N number of weighted repeater signals by N transmitters.
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32. A processor, comprising a memory having stored thereon computer executable instructions to cause the processor to performing at least the following acts:
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receiving repeater transmitter leakage signal and receive signal at a receiver to classify as a composite receive signal; generating a post cancellation receive signal by a leakage cancellation block; providing a selected time delay to the post cancellation leakage signal used to de-correlate the receive signal from the transmitter leakage signal to generate a de-correlated transmit signal; and transmit the de-correlated transmit signal.
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33. A system that facilitates feedback loop cancelation in a repeater environment comprising:
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means for receiving repeater transmitter leakage signal and receive signal at M number of receivers; means for applying M number of complex spatial receive weights on the M number of receivers to generate weighted receiver signals; means for combining the weighted receiver signals to generate a composite weighted signal; means for providing a selected time delay to the post cancellation leakage signal used to de-correlate the receive signal from the transmitter leakage signal to generate a de-correlated transmit signal; means for generating new receiver and transmitter complex spatial weights using an adaptive algorithm utilizing a correlation metric and a selected convergence time; and means for transmitting N number of weighted repeater signals by N transmitters.
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34. A repeater comprising:
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a receiver configured to receive signals including a desired received signal and received transmitter leakage; a feedback canceller configured to modify the received signals to remove at least some of the received transmitter leakage using current cancellation parameters; a correlator configured to receive the output of the feedback canceller and a delayed output of the feedback canceller and to output a correlation metric by correlating the output of the feedback canceller with the delayed output of the feedback canceller; and control logic to determine updated cancellation parameters using at least the correlation metric. - View Dependent Claims (35, 36, 37, 38)
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Specification