Control of power amplifiers in devices using transmit beamforming
First Claim
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1. A radio transmitter, comprising:
- a baseband signal processor configured to weight each of a plurality of digital baseband transmit signals with a corresponding one of a plurality of transmit weights to produce a plurality of digital weighted signals;
a digital to analog converter configured to convert each of the plurality of transmit weights to an analog bias signal;
a plurality of amplifiers, each amplifier configured to amplify an upconverted digital weighted signal as a corresponding radio frequency signal;
a plurality of bias circuits, each bias circuit corresponding to one of the plurality of amplifiers and configured to control the bias of the corresponding amplifier according to the transmit weights applied to the corresponding baseband transmit signal; and
a plurality of antennas, each antenna corresponding to one of the plurality of amplifiers, configured to simultaneously transmit the radio frequency signals.
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Abstract
A transmitter comprises a plurality of transmit antennas for simultaneously transmitting weighted signals according to a channel transfer function. Each antenna has a corresponding amplifier that is bias controlled according to the transmit weights derived for the antenna transmission. A baseband processor produces digital weighted signals for upconversion and amplification by the amplifiers. Each amplifier is accompanied by a bias circuit responsive to the transmit weights. Alternatively, or additionally, corresponding DC/DC converters are used to control the operating voltage of the amplifiers.
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Citations
14 Claims
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1. A radio transmitter, comprising:
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a baseband signal processor configured to weight each of a plurality of digital baseband transmit signals with a corresponding one of a plurality of transmit weights to produce a plurality of digital weighted signals;
a digital to analog converter configured to convert each of the plurality of transmit weights to an analog bias signal;
a plurality of amplifiers, each amplifier configured to amplify an upconverted digital weighted signal as a corresponding radio frequency signal;
a plurality of bias circuits, each bias circuit corresponding to one of the plurality of amplifiers and configured to control the bias of the corresponding amplifier according to the transmit weights applied to the corresponding baseband transmit signal; and
a plurality of antennas, each antenna corresponding to one of the plurality of amplifiers, configured to simultaneously transmit the radio frequency signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio transmitter, comprising:
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a baseband signal processor configured to weight each of a plurality of digital baseband transmit signals with a corresponding one of a plurality of transmit weights to produce a plurality of digital weighted signals;
a digital to analog converter configured to convert each of the plurality of transmit weights to an analog bias signal;
a plurality of amplifiers, each amplifier configured to amplify an upconverted digital weighted signal as a corresponding radio frequency signal;
a plurality of DC/DC converters, each DC/DC converter corresponding to one of the plurality of amplifiers and configured to control the operating voltage of the corresponding amplifier according to the transmit weights applied to the corresponding baseband transmit signal; and
a plurality of antennas, each antenna corresponding to one of the plurality of amplifiers, configured to simultaneously transmit the radio frequency signals. - View Dependent Claims (11, 12, 13, 14)
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Specification