Adaptive predistortion for a transmit system

• US 7,295,066 B2
• Filed: 04/10/2006
• Issued: 11/13/2007
• Est. Priority Date: 07/03/2003
• Status: Expired due to Term

• Current Assignee: Zarbana Digital Fund LLC (Intellectual Ventures LLC)
• Original Assignee: Zarbana Digital Fund LLC (Intellectual Ventures LLC)
• Inventors: Saèd, Aryan
• Primary Examiner(s): NGUYEN, PATRICIA T
• Application Number:
  US11/401,603
• Publication Number:
  US 20060181345A1
• Time in Patent Office: 582 Days
• Field of Search: 330/149, 330/84, 330/107, 330/124.R
• US Class Current: 330/149
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H03F 1/3282 Acting on the phase and the amplitude of the input signal
• CPC Class Codes: H03F 2201/3233 Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence

Abstract

Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem. A feedback signal, a replica of the system output signal, is used in updating lookup table entries used to determine the predistortion.

Claims

1. A preprogrammed control device for use in controlling an adaptive predistortion subsystem, said device being programmed to operate in a plurality of states associated with sets of commands to be executed by said subsystem in response to said device being in said states, the device comprising:

a processor means for receiving and processing data;

first memory means for storing said data; and

second memory means for storing preprogrammed settings for said device, wherein

said device is adapted to transition from a first one of said states to a second one of said states in response to detection of at least one of a set of conditions based, at least in part, on said processed data.

2. The control device according to claim 1 wherein said device controls an update duty cycle for said subsystem, said update duty cycle being determinative of how often said subsystem updates at least one internal lookup table.

3. The control device according to claim 1 wherein said device controls an initialization duty cycle for said subsystem, said initialization duty cycle being determinative of how often said subsystem initializes itself.

4. The control device according to claim 3 wherein said initialization duty cycle is dependent on how often said subsystem updates at least one internal lookup table.

5. The control device according to claim 1 wherein said control device is adapted from said first state to said second state based, at least in part, on input from a distortion monitor which monitors a level of distortion for said subsystem.

34. The control device according to claim 1, wherein said control device is further adapted to transition to said second state by initiating execution of at least one of said sets of commands associated with said second state.

6. A programmable control device capable of controlling a predistortion subsystem for a transmission system, the programmable control device being programmable to operate in a plurality of states, one or more of the states being associated with one or more commands to be executed by the predistortion subsystem in response to the programmable control device being in an associated state, the programmable control device comprising:

a processor capable of processing data relating to a status of the predistortion subsystem; and

a memory circuit capable of storing settings for the programmable control device;

wherein, responsive to the processed data, said processor is adapted to transition from one of said states to another of said states based at least in part on the settings of said memory circuit.

7. The programmable control device as claimed in claim 6, said processor being capable of controlling an update duty cycle for the predistortion subsystem, the update duty cycle being determinative of how often the predistortion subsystem updates at least one lookup table.

8. The programmable control device as claimed in claim 6, said processor being capable of controlling an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized.

9. The programmable control device as claimed in claim 6, said processor being capable of controlling an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized, the initialization duty cycle being dependent on how often the predistortion subsystem updates at least one lookup table.

10. The programmable control device as claimed in claim 6, said processor being capable of controlling the programmable control device to transition from said one of said states to said another of said states based at least in part on input from a distortion monitor that monitors a level of distortion for the predistortion subsystem.

11. The programmable control device as claimed in claim 6, the plurality of states comprising one or more of a reset state, a pause state, a hold state, a warm up state, a standby state, an update state, a full initialization state, a re-initialization state, or a cool down state, or combinations thereof.

12. The programmable control device as claimed in claim 6, the one or more states comprising one or more of a reset state, a measure state, a freeze state, a no monitor state, or a monitor state, or combinations thereof.

35. The programmable control device according to claim 6, wherein said control device is further adapted to transition to said another of said states by initiating execution of at least one of said sets of commands associated with said another of said states.

13. An article of manufacture, comprising:

a storage medium having instructions stored thereon which, if executed are capable of causing a programmable control device to control a predistortion subsystem for a transmission system, the programmable control device being programmed to operate in a plurality of states, one or more of the states being associated with one or more commands to be executed by the predistortion subsystem in response to the programmable control device being in an associated state, by;

processing data relating to a status of the predistortion subsystem;

storing settings for the programmable control device; and

responsive to the processed data, transitioning the preprogrammed control device from one of said states to another of said states based at least in part on the stored settings.

14. The article of manufacture as claimed in claim 13, wherein the instructions, if executed, are further capable of causing the programmable control device to control a predistortion subsystem for a transmission system, by:

controlling an update duty cycle for the predistortion subsystem, the update duty cycle being determinative of how often the predistortion subsystem updates at least one lookup table.

15. The article of manufacture as claimed in claim 13, wherein the instructions, if executed, are further capable of causing the programmable control device to control a predistortion subsystem for a transmission system, by:

controlling an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized.

16. The article of manufacture as claimed in claim 13, wherein the instructions, if executed, are further capable of causing the programmable control device to control a predistortion subsystem for a transmission system, by:

controlling an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized, the initialization duty cycle being dependent on how often the predistortion subsystem updates at least one lookup table.

17. The article of manufacture as claimed in claim 13, wherein the instructions, if executed, are further capable of causing the programmable control device to control a predistortion subsystem for a transmission system, by:

causing the programmable control device to transition from said one of said states to said another of said states based at least in part on input from a distortion monitor that monitors a level of distortion for the predistortion subsystem.

18. The article of manufacture as claimed in claim 13, wherein the plurality of states comprise one or more of the following:

a reset state, a pause state, a hold state, a warm up state, a standby state, an update state, a full initialization state, a re-initialization state, or a cool down state, or combinations thereof.

19. article of manufacture as claimed in claim 13, wherein the plurality of states comprise one or more of the following:

a reset state, a measure state, a freeze state, a no monitor state, or a monitor state, or combinations thereof.

36. The article of manufacture according to claim 13, wherein said transitioning the preprogrammed control device to said another of said states comprises initiating execution of at least one of said sets of commands associated with said another of said states.

20. An application specific integrated circuit capable of controlling a predistortion subsystem of a transmission system, the application specific integrated circuit being programmable to operate in a plurality of states, one or more of the states being associated with one or more commands to be executed by the predistortion subsystem in response to the application specific integrated circuit being in an associated state, the application specific integrated circuit comprising:

a processor capable of processing data relating to a status of the predistortion subsystem; and

a memory circuit capable of storing settings for the application specific integrated circuit;

wherein, responsive to the processed data, the processor is adapted to cause the application specific integrated circuit to transition from one of said states to another one of said states based at least in part on the settings of said memory circuit.

21. The application specific integrated circuit as claimed in claim 20, wherein said processor controls an update duty cycle for the predistortion subsystem, the update duty cycle being determinative of how often the predistortion subsystem updates at least one lookup table.

22. The application specific integrated circuit as claimed in claim 20, wherein said processor controls an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized.

23. The application specific integrated circuit as claimed in claim 20, wherein said processor controls an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized, the initialization duty cycle being dependent on how often the predistortion subsystem updates at least one lookup table.

24. The application specific integrated circuit as claimed in claim 20, wherein said processor causes the application specific integrated circuit to transition from said one of said states to said another of said states based at least in part on input from a distortion monitor that monitors a level of distortion for the predistortion subsystem.

25. The application specific integrated circuit as claimed in claim 20, wherein the plurality of states comprise one or more of the following:

a reset state, a pause state, a hold state, a warm up state, a standby state, an update state, a full initialization state, a re-initialization state, or a cool down state, or combinations thereof.

26. The application specific integrated circuit as claimed in claim 20, wherein the plurality of states comprise one or more of the following:

a reset state, a measure state, a freeze state, a no monitor state, or a monitor state, or combinations thereof.

27. A combinational logic circuit capable of controlling a predistortion subsystem of a transmission system, the combinational logic circuit being programmable to operate in a plurality of states, one or more of the states being associated with one or more commands to be executed by the predistortion subsystem in response to the combinational logic circuit being in an associated state, the combinational logic circuit comprising:

a first logic circuit capable of processing data relating to a status of the predistortion subsystem; and

a second logic circuit capable of storing settings for the combinational logic circuit;

wherein, responsive to the processed data, the first logic circuit is adapted to cause the combinational logic circuit to transition from one of said states to another one of said states based at least in part on the settings of said second logic circuit.

28. The combinational logic circuit as claimed in claim 27, wherein said first logic circuit controls an update duty cycle for the predistortion subsystem, the update duty cycle being determinative of how often the predistortion subsystem updates at least one lookup table.

29. The combinational logic circuit as claimed in claim 27, wherein said first logic circuit controls an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized.

30. The combinational logic circuit as claimed in claim 27, wherein said first logic circuit controls an initialization duty cycle for the predistortion subsystem, the initialization duty cycle being determinative of how often the predistortion subsystem is initialized, the initialization duty cycle being dependent on how often the predistortion subsystem updates at least one lookup table.

31. The combinational logic circuit as claimed in claim 27, wherein said first logic circuit causes the application specific integrated circuit to transition from said one of said states to said another of said states based at least in part on input from a distortion monitor that monitors a level of distortion for the predistortion subsystem.

32. The combinational logic circuit as claimed in claim 27, wherein the plurality of states comprise one or more of the following:

a reset state, a pause state, a hold state, a warm up state, a standby state, an update state, a full initialization state, a re-initialization state, or a cool down state, or combinations thereof.

33. The combinational logic circuit as claimed in claim 27, wherein the plurality of states comprise one or more of the following:

a reset state, a measure state, a freeze state, a no monitor state, or a monitor state, or combinations thereof.