BEAM STEERING DIGITAL PREDISTORTION
First Claim
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1. A method for signal predistortion comprising:
- receiving a plurality of input driving signals for driving an antenna array;
converting the plurality of input driving signals to a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals;
processing the plurality of input directional signals to form a plurality of directional predistortion signals each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals;
using the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals; and
providing the plurality of predistorted driving signals for driving the antenna array.
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Abstract
An approach to predistortion of a first set of signals for an antenna array allows beam-steering without corrupting spectrum away from the main beam and where other users may be located. In some implementations, the predistorter uses fewer than one predistorter per signal (i.e., per power amplifier or per antenna), and/or has the computational complexity of such fewer predistorters, to generate predistortions of the first set of signals for amplification and transmission via the antenna array.
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Citations
28 Claims
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1. A method for signal predistortion comprising:
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receiving a plurality of input driving signals for driving an antenna array; converting the plurality of input driving signals to a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals; processing the plurality of input directional signals to form a plurality of directional predistortion signals each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals; using the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals; and providing the plurality of predistorted driving signals for driving the antenna array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 22, 23, 24, 25, 26, 27)
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11. A beam-steering pre-distorter system comprising:
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a first mapper configured to accept a plurality of input driving signals to drive an antenna array and provide a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals; a pre-distorter configured to process the plurality of input directional signals to form a plurality of directional predistortion signals, each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals; and a filtering unit configured to use the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals and provide the plurality of predistorted driving signals to drive the antenna array. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A predistorter configured to:
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receive a plurality of input driving signals for driving an antenna array; convert the plurality of input driving signals to a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals; process the plurality of input directional signals to form a plurality of directional predistortion signals, each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals; use the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals; and provide the plurality of predistorted driving signals for driving the antenna array.
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20. A design structure encoded on a non-transitory machine-readable medium, said design structure comprising elements that, when processed, generate a beam-steering pre-distorter system comprising:
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a first mapper configured to accept a plurality of input driving signals to drive an antenna array and provide a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals; a pre-distorter configured to process the plurality of input directional signals to form a plurality of directional predistortion signals, each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals; and a filtering unit configured to use the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals, and provide the plurality of predistorted driving signals to drive the antenna array.
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21. A non-transitory computer readable media programmed with a set of computer instructions executable on a processor that, when executed, cause the operations comprising:
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receiving a plurality of input driving signals for driving an antenna array; converting the plurality of input driving signals to a plurality of input directional signals having fewer signals than the plurality of input driving signals, each of the plurality of input directional signals being associated with a respective direction of a plurality of directions of emission from the antenna array, wherein the plurality of directions of emission comprises a direction of a side lobe of an antenna pattern associated with the plurality of input driving signals; processing the plurality of input directional signals to form a plurality of directional predistortion signals, each of the plurality of directional predistortion signals being associated with a respective one of the plurality of input directional signals; using the plurality of directional predistortion signals to predistort the plurality of input driving signals to yield a plurality of predistorted driving signals; and providing the plurality of predistorted driving signals for driving the antenna array.
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28. A method for mitigating sidelobe emission from an antenna array comprising:
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receiving a plurality of input driving signals for driving the antenna array via a plurality of non-linear signal paths, each non-linear signal path for driving a respective set of antennas of the antenna array; determining a sidelobe direction of emission from the antenna array; forming an input directional signal corresponding to the sidelobe direction from the plurality of input driving signals; predistorting each of the input driving signals to form corresponding predistorted driving signals according to a processing of the input directional signal to reduce sidelobe emission in the sidelobe direction; and providing the predistorted driving signals for driving the sets of antennas of the antenna array.
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Specification