Apparatus and method for digital pre-distortion, sharing feedback path in a multiple antenna wireless communication system
First Claim
1. A Digital Pre-Distortion (DPD) power amplifier apparatus of a transmission end comprising a plurality of transmission paths in a multiple antenna wireless communication system, the apparatus comprising:
- a plurality of amplifiers for amplifying an input signal directed to each of the transmission paths;
a plurality of couplers for coupling amplified signals on respective transmission paths;
a switch for outputting at least one of the amplified signals coupled on the respective transmission paths;
a shared feedback path for providing the amplified signal output from the switch to a plurality of processors;
a controller that is configured to output a reference signal to each of the transmission paths in order to determine a feedback path gain comprising a path gain from an input terminal of a coupler on each transmission path to a feedback input terminal of a respective processor; and
the plurality of processors for comparing a feedback signal provided through the shared feedback path with the input signal and for pre-distorting the input signal such that the input signal and the amplified signal are linear with each other.
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Abstract
A multiple antenna wireless communication system using a DPD power amplifier and a method for controlling an amplitude of an input signal for a plurality of transmission paths of the DPD power amplifier are provided. The system includes a plurality of amplifiers, a plurality of couplers, a switch, a shared feedback path and a plurality of processors. The plurality of amplifiers amplifies an input signal directed to each of the transmission paths. The plurality of couplers couple amplified signals on respective transmission paths. The switch outputs at least one of the amplified signals coupled on the respective transmission paths. The shared feedback path provides the amplified signal output from the switch to a plurality of processors. The plurality of processors compare a feedback signal provided through the shared feedback path with the input signal and pre-distort the input signal such that the input signal and the amplified signal have a linear relation with each other.
26 Citations
20 Claims
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1. A Digital Pre-Distortion (DPD) power amplifier apparatus of a transmission end comprising a plurality of transmission paths in a multiple antenna wireless communication system, the apparatus comprising:
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a plurality of amplifiers for amplifying an input signal directed to each of the transmission paths; a plurality of couplers for coupling amplified signals on respective transmission paths; a switch for outputting at least one of the amplified signals coupled on the respective transmission paths; a shared feedback path for providing the amplified signal output from the switch to a plurality of processors; a controller that is configured to output a reference signal to each of the transmission paths in order to determine a feedback path gain comprising a path gain from an input terminal of a coupler on each transmission path to a feedback input terminal of a respective processor; and the plurality of processors for comparing a feedback signal provided through the shared feedback path with the input signal and for pre-distorting the input signal such that the input signal and the amplified signal are linear with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 20)
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14. A method for controlling an amplitude of an input signal for a plurality of transmission paths of a DPD power amplifier of a transmission end comprising the plurality of transmission paths in a multiple antenna wireless communication system, the method comprising:
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outputting a reference signal to each of the transmission paths; determining a feedback path gain of the each transmission path using an amplitude of the reference signal fed back to a corresponding DPD processor after passing through each transmission path; determining an amplitude of an output signal of each transmission path; and controlling the amplitude of the input signal directed to each transmission path such that the amplitude of the input signal directed to each transmission path is proportional to the feedback path gain of each transmission path. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification