CONTROL OF POWER AMPLIFIERS IN DEVICES USING TRANSMIT BEAMFORMING
First Claim
Patent Images
1. A method for power control of a plurality of power amplifiers used for transmit beamforming, the method comprising:
- determining that a packet of information is to be transmitted;
weighting 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 representing the packet of information;
converting each of the plurality of digital weighted signals to a corresponding analog signal and then to a radio frequency signal;
supplying each of the radio frequency signals to a corresponding one of a plurality of power amplifiers that amplify the corresponding radio frequency signal;
supplying each of the radio frequency signals to a corresponding one of a plurality of self-bias boosting circuits associated with corresponding ones of the plurality of power amplifiers, wherein each self-bias boosting circuit biases the corresponding power amplifier according to a level of the corresponding radio frequency signal supplied to it;
amplifying each radio frequency signals with a corresponding one of the plurality of power amplifiers for simultaneous transmission; and
updating the transmit weights on a per-packet basis.
0 Assignments
0 Petitions
Accused Products
Abstract
A radio transmitter and method controls efficiency of each of a plurality of power amplifiers that amplify a corresponding one of a plurality of radio frequency signals for a beamforming transmission by a corresponding one of a plurality of antennas. Each of the plurality of power amplifiers is controlled to operate with one or more operating parameters that optimize the efficiency for an output power level of corresponding ones of the radio frequency signals. Transmit weights for transmit signals are determined and updated on a per-packet basis.
-
Citations
6 Claims
-
1. A method for power control of a plurality of power amplifiers used for transmit beamforming, the method comprising:
-
determining that a packet of information is to be transmitted; weighting 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 representing the packet of information; converting each of the plurality of digital weighted signals to a corresponding analog signal and then to a radio frequency signal; supplying each of the radio frequency signals to a corresponding one of a plurality of power amplifiers that amplify the corresponding radio frequency signal; supplying each of the radio frequency signals to a corresponding one of a plurality of self-bias boosting circuits associated with corresponding ones of the plurality of power amplifiers, wherein each self-bias boosting circuit biases the corresponding power amplifier according to a level of the corresponding radio frequency signal supplied to it; amplifying each radio frequency signals with a corresponding one of the plurality of power amplifiers for simultaneous transmission; and updating the transmit weights on a per-packet basis. - View Dependent Claims (2)
-
-
3. A radio transmitter, comprising:
-
a baseband signal processor configured to determine that a packet of information is to be transmitted, 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 representing the packet of information, and to update the transmit weights on a per-packet basis; 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; and a plurality of self-bias boosting circuits associated with corresponding ones of the plurality of power amplifiers, wherein each self-bias boosting circuit biases the corresponding power amplifier according to a level of the corresponding radio frequency signal supplied to it; 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 (4, 5, 6)
-
Specification