Digital pre-distortion (DPD) training and calibration system and related techniques
First Claim
Patent Images
1. A radio frequency (RF) transmit system comprising:
- a controller configured to provide data signals at an output thereof;
an RF signal generator having an input coupled to the output of said controller, said RF signal generator configured to receive data signals from said controller and in response thereto, to provide an RF signal at an output thereof;
an RF signal path having a first end coupled to the output of said RF signal generator and having a second end, said RF transmit signal path comprising an RF amplifier;
an RF coupler coupled to said RF transmit signal path and disposed to couple a portion of an RF signal from said RF transmit signal path;
an observation receiver having an input and an output, with the input of said observation receiver coupled to said RF coupler and said observation receiver configured to receive the coupled portion of the RF signal from said RF coupler;
a digital pre-distortion (DPD) system having an input coupled to the output of said observation receiver, said DPD system having stored therein one or more initial DPD values selected to ensure that the RF transmit system operates with a signal integrity which meets a minimum desired performance criteria upon initial power on of the RF transmit system and wherein the DPD system is configured to receive one or more signals from said observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller; and
a supply modulator coupled to receive one or more DPD values from one of;
said DPD system; and
said controller.
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Abstract
A radio frequency (RF) transmit system includes an observation receiver coupled to receive a portion of an RF signal propagating along an RF transmit signal path and a digital pre-distortion (DPD) system coupled to the observation receiver and configured to receive one or more signals from the observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller.
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Citations
33 Claims
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1. A radio frequency (RF) transmit system comprising:
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a controller configured to provide data signals at an output thereof; an RF signal generator having an input coupled to the output of said controller, said RF signal generator configured to receive data signals from said controller and in response thereto, to provide an RF signal at an output thereof; an RF signal path having a first end coupled to the output of said RF signal generator and having a second end, said RF transmit signal path comprising an RF amplifier; an RF coupler coupled to said RF transmit signal path and disposed to couple a portion of an RF signal from said RF transmit signal path; an observation receiver having an input and an output, with the input of said observation receiver coupled to said RF coupler and said observation receiver configured to receive the coupled portion of the RF signal from said RF coupler; a digital pre-distortion (DPD) system having an input coupled to the output of said observation receiver, said DPD system having stored therein one or more initial DPD values selected to ensure that the RF transmit system operates with a signal integrity which meets a minimum desired performance criteria upon initial power on of the RF transmit system and wherein the DPD system is configured to receive one or more signals from said observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller; and a supply modulator coupled to receive one or more DPD values from one of; said DPD system; and said controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A radio frequency (RF) transmit system comprising:
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a controller configured to provide data signals at an output thereof; an RF signal generator having an input coupled to the output of said controller, said RF signal generator configured to receive data signals from said controller and in response thereto, to provide an RF signal at an output thereof; an RF signal path having a first end coupled to the output of said RF signal generator and having a second end, said RF transmit signal path comprising an RF amplifier; an RF coupler coupled to said RF transmit signal path and disposed to couple a portion of an RF signal from said RF transmit signal path; an observation receiver having an input and an output, with the input of said observation receiver coupled to said RF coupler and said observation receiver configured to receive the coupled portion of the RF signal from said RF coupler; and a digital pre-distortion (DPD) system having an input coupled to the output of said observation receiver, said DPD system having stored therein one or more initial DPD values selected to ensure that the RF transmit system operates with a signal integrity which meets a minimum desired performance criteria upon initial power on of the RF transmit system and wherein the DPD system is configured to receive one or more signals from said observation receiver and in response thereto, to adapt one or more DPD values of the RF transmit system over a period of time and a range of operating conditions of the RF transmit system and to provide one or more adapted DPD values to said controller; wherein said observation receiver is configured to process the coupled signal provided thereto and provide feedback information about the coupled signal to said DPD system wherein said DPD system comprises a training system configured to adapt the one or more DPD values based upon the provided feedback information; and wherein said DPD system is configured to reset and re-adapt the one or more DPD values in response to a change of at least one of the operating conditions of the RF transmit system.
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19. A method of operating a radio frequency (RF) transmit system having at least one RF amplifier having an RF input port coupled to an RF source, an RF output port coupled to a transmit signal path, and a drain bias port, at least one voltage modulator coupled to the drain bias port of the least one RF amplifier to provide a bias voltage, and a digital pre-distortion (DPD) system, the method comprising:
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operating the RF transmit system in a first operating mode; adapting one or more DPD values of the DPD system during an operating time and a range of operating conditions of the RF transmit system, the one or more DPD values corresponding to at least one of;
(i) at least one setting of the at least one voltage modulator, and (ii) at least one setting of the RF source; andafter operating the RF transmit system in the first operating mode, operating the RF transmit system in at least one operating mode corresponding to the one or more adapted DPD values, wherein the one or more adapted DPD values provide operation of the RF transmit system at a determined maximum power efficiency level to achieve a desired signal integrity level over the range of operating conditions of the RF transmit system operating a supply modulator coupled to receive one or more DPD values from one of; said DPD system; and said controller. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification