SYSTEM AND METHOD FOR ADAPTIVE BEAMFORMING FOR SPECIFIC ABSORPTION RATE CONTROL
First Claim
1. A system comprising:
- a modifiable mobile communication device including;
at least two antennas coupled to respective fractional power amplifiers;
respective returned power detectors coupled to a transmission path between each of the at least two antennas and respective fractional power amplifiers;
a beamformer unit configured to provide an adaptive beam shaping pattern to the fractional power amplifiers, the adaptive beam shaping pattern configured to shape a transmitted beam pattern to minimize an amount of transmitted power reflected back to at least one of the antennas; and
a baseband processor configured to provide beam pattern requirements to the beamformer unit;
wherein the respective returned power detectors provide return loss sampling information to the beamformer unit.
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Accused Products
Abstract
A system may include a modifiable mobile device having at least two antennas coupled to fractional amplifiers, with returned power detectors. A beamformer unit provides adaptive beam shaping pattern, and a baseband processor provides beam pattern requirements, wherein the beamformer unit modifies the beam pattern requirements with return loss sampling information to shape the adaptive beam pattern so that a transmitted beam pattern minimizes transmitted power reflected back to the mobile device. A method may include regularly measuring a return power level, if output power is greater than a specific absorption rate level, comparing the return power level to a first threshold, else implementing mobile transmit diversity (MTD), and repeating. If the return power level is greater than the first threshold, implementing a MTD combined with reflection-based beamforming that modifies beam pattern requirements of the mobile device with return loss sampling information to create an adaptive beam pattern.
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Citations
20 Claims
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1. A system comprising:
a modifiable mobile communication device including; at least two antennas coupled to respective fractional power amplifiers; respective returned power detectors coupled to a transmission path between each of the at least two antennas and respective fractional power amplifiers; a beamformer unit configured to provide an adaptive beam shaping pattern to the fractional power amplifiers, the adaptive beam shaping pattern configured to shape a transmitted beam pattern to minimize an amount of transmitted power reflected back to at least one of the antennas; and a baseband processor configured to provide beam pattern requirements to the beamformer unit; wherein the respective returned power detectors provide return loss sampling information to the beamformer unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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9. A method comprising the steps of:
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a) measuring a return power level present at antennas of a modifiable mobile communication device at regular time intervals; b) if an output power of the modifiable mobile communication device is greater than a predefined specific absorption rate level, comparing the return power level to a first threshold; c) if an output power of the modifiable mobile communication device is less than or equal to a predefined specific absorption rate level, implementing mobile transmit diversity; and d) repeating steps a-c; e) if the return power level is greater than the first threshold, implementing a mobile transmit diversity algorithm combined with a reflection-based beamforming technique, the reflection-based beamforming technique providing an adaptive beam shaping pattern that shapes a transmitted beam pattern to minimize an amount of reflected transmitted power; f) re-measuring the return power level; g) if the return power level has increased, applying a change to a diversity parameter of the mobile transmit diversity algorithm based on the results of the evaluating step; h) if the return power level is less than a second threshold, repeating steps a-c; and i) if the return power level is equal to or greater than the second threshold, repeating steps e-g. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising the steps of;
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a) measuring a return power level present at antennas of a modifiable mobile communication device at regular time intervals; b) if an output power of the modifiable mobile communication device is greater than a predefined specific absorption rate level, comparing the return power level to a first threshold; c) if an output power of the modifiable mobile communication device is less than or equal to a predefined specific absorption rate level, implementing mobile transmit diversity; and d) repeating steps a-c; e) if the return power level is greater than the first threshold, implementing a mobile transmit diversity algorithm combined with reflection-based beamforming, the reflection-based beamforming providing an adaptive beam shaping pattern that shapes a transmitted beam pattern to minimize an amount of reflected transmitted power; f) re-measuring the return power level; g) if the return power level has increased, reducing the output power of the modifiable mobile communication device; h) if the return power level is less than a second threshold, repeating steps a-c; and i) if the return power level is equal to or greater than the second threshold, repeating steps e-g. - View Dependent Claims (17, 18, 19, 20)
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Specification