Method, system, and apparatus for wireless power transmission based on power waveforming
First Claim
1. An apparatus for wireless power transmission, comprising:
- at least one antenna configured for receiving at least one wireless signal from a receiver, via a multipath channel between the apparatus and the receiver; and
at least one processor configured forestimating at least one channel state information (CSI) of the multipath channel based on the at least one wireless signal,determining a power transmission waveform based on the at least one CSI, andcalculating a power transfer signal based on the power transmission waveform and a reference signal,wherein the at least one antenna is further configured for wirelessly transmitting the power transfer signal to the receiver,wherein determining the power transmission waveform comprises jointly designing the power transmission waveform and the reference signal to maximize an efficiency gain that is a ratio between a total harvested energy at the receiver and a total energy expenditure at the apparatus,wherein jointly designing the power transmission waveform and the reference signal comprises;
initiating an iteration number,optimizing, based on an initial version of the reference signal or a previous version of the reference signal from previous iteration, the power transmission waveform to maximize the efficiency gain and generate a current version of the power transmission waveform of current iteration,optimizing, based on the current version of the power transmission waveform of current iteration, the reference signal to maximize the efficiency gain and generate a current version of the reference signal of current iteration,increasing the iteration number by one, andrepeating the steps of optimizing the power transmission waveform, optimizing the reference signal and increasing the iteration number, until at least one of the following;
the iteration number exceeds a first threshold, a difference between the current version of the reference signal of current iteration and the previous version of the reference signal from previous iteration is smaller than a second threshold, and a difference between the current version of the power transmission waveform of current iteration and a previous version of the power transmission waveform from previous iteration is smaller than a third threshold.
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Abstract
The present teaching relates to wireless power transmission based on power waveforming. In one example, an apparatus for wireless power transmission is disclosed. The apparatus comprises: at least one antenna configured for receiving at least one wireless signal from a receiver, via a multipath channel between the apparatus and the receiver; and at least one processor configured for estimating at least one channel state information (CSI) of the multipath channel based on the at least one wireless signal, determining a power transmission waveform based on the at least one CSI, and calculating a power transfer signal based on the power transmission waveform and a reference signal. The at least one antenna is further configured for wirelessly transmitting the power transfer signal to the receiver.
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Citations
23 Claims
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1. An apparatus for wireless power transmission, comprising:
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at least one antenna configured for receiving at least one wireless signal from a receiver, via a multipath channel between the apparatus and the receiver; and at least one processor configured for estimating at least one channel state information (CSI) of the multipath channel based on the at least one wireless signal, determining a power transmission waveform based on the at least one CSI, and calculating a power transfer signal based on the power transmission waveform and a reference signal, wherein the at least one antenna is further configured for wirelessly transmitting the power transfer signal to the receiver, wherein determining the power transmission waveform comprises jointly designing the power transmission waveform and the reference signal to maximize an efficiency gain that is a ratio between a total harvested energy at the receiver and a total energy expenditure at the apparatus, wherein jointly designing the power transmission waveform and the reference signal comprises; initiating an iteration number, optimizing, based on an initial version of the reference signal or a previous version of the reference signal from previous iteration, the power transmission waveform to maximize the efficiency gain and generate a current version of the power transmission waveform of current iteration, optimizing, based on the current version of the power transmission waveform of current iteration, the reference signal to maximize the efficiency gain and generate a current version of the reference signal of current iteration, increasing the iteration number by one, and repeating the steps of optimizing the power transmission waveform, optimizing the reference signal and increasing the iteration number, until at least one of the following;
the iteration number exceeds a first threshold, a difference between the current version of the reference signal of current iteration and the previous version of the reference signal from previous iteration is smaller than a second threshold, and a difference between the current version of the power transmission waveform of current iteration and a previous version of the power transmission waveform from previous iteration is smaller than a third threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for wireless power transmission, comprising:
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at least one antenna configured for receiving at least one wireless signal from a receiver, via a multipath channel between the apparatus and the receiver; and at least one processor configured for estimating at least one channel state information (CSI) of the multipath channel based on the at least one wireless signal, determining a power transmission waveform based on the at least one CSI, and calculating a power transfer signal based on the power transmission waveform and a reference signal, wherein the at least one antenna is further configured for wirelessly transmitting the power transfer signal to the receiver, wherein determining the power transmission waveform comprises jointly designing the power transmission waveform and the reference signal to maximize an efficiency gain that is a ratio between a total harvested energy at the receiver and a total energy expenditure at the apparatus, wherein jointly designing the power transmission waveform and the reference signal comprises; designing the power transmission waveform to be a single-tone waveform regardless of the designing of the reference signal, when the reference signal is periodic and a first length of the power transmission waveform is a multiple of a second length of the reference signal, and designing the reference signal to be a single-tone signal that has a power spectrum condensed into a single frequency tone that has a largest value of summation of channel power over all transmit antennas on the apparatus, regardless of the designing of the power transmission waveform, when the reference signal is periodic and the second length of the reference signal is larger than or equal to a third length of the multipath channel. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An apparatus for wireless power transmission, comprising:
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at least one antenna configured for receiving at least one wireless signal from a receiver, via a multipath channel between the apparatus and the receiver; and at least one processor configured for estimating at least one channel state information (CSI) of the multipath channel based on the at least one wireless signal, determining a power transmission waveform based on the at least one CSI, and calculating a power transfer signal based on the power transmission waveform and a reference signal, wherein the at least one antenna is further configured for wirelessly transmitting the power transfer signal to the receiver, wherein the power transmission waveform is a narrowband frequency tone waveform, wherein the at least one antenna includes at least one of;
an omni-directional antenna and a dipole antenna,wherein the at least one wireless signal has an auto-correlation function that is a delta function, wherein the at least one CSI includes at least one of;
a channel impulse response (CIR) of the multipath channel and a channel frequency response (CFR) of the multipath channel, andwherein the at least one wireless signal includes at least one of;
a wireless signal having a center frequency between 2 GHz and 3 GHz and a wireless signal having a center frequency between 5 GHz and 7 GHz. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification