Methods and systems for dynamically calibrated pre-distortion

Abstract

Systems and methods are provided for dynamic calibration of pre-distortion modification in transmitters. The pre-distortion modification may be applied during processing of an input signal for transmission, and feedback data, relating to the transmitter and/or processing performed after application of the pre-distortion modification in the transmitter, may be obtained. Adjustments to the pre-distortion modification may be determined based on the feedback data, and the adjustments to the pre-distortion modification may be applied in loop-back manner, thus enabling adjustment of pre-distortion modification dynamically based on real-time and current data. The pre-distortion modification may comprise modifying one or more signal characteristics, such as phase, frequency, and/or amplitude. Determining and/or applying the adjustments to the pre-distortion modification may be done periodically, based on one or more particular events, or conditionally.

What is claimed is: 
     
         1 . A system comprising:
 a transmitter comprising one or more circuits, said one or more circuits being operable to:
 apply, during processing of an input signal for transmission, pre-distortion modification; 
 obtain feedback data, wherein said feedback data relate to the transmitter and/or processing performed after application of said pre-distortion modification in the transmitter; 
 determine, based on said feedback data, one or more adjustments to said pre-distortion modification; and 
 apply said one or more adjustments to said pre-distortion modification. 
   
     
     
         2 . The system of  claim 1 , wherein said pre-distortion modification comprises modifying one or more characteristics of said input signal. 
     
     
         3 . The system of  claim 2 , wherein said one or more characteristics comprise at least one of: phase, frequency, and amplitude. 
     
     
         4 . The system of  claim 1 , wherein said one or more circuits are operable to determine and/or apply said one or more adjustments periodically, based on one or more particular events, or conditionally. 
     
     
         5 . The system of  claim 1 , wherein said feedback data comprise data relating to or derived from one or more intermediate signals generated within the transmitter during said processing performed after application of said pre-distortion modification in the transmitter. 
     
     
         6 . The system of  claim 5 , wherein said one or more circuits are operable to process said one or more intermediate signals to obtain said data relating to or derived from said one or more intermediate signals. 
     
     
         7 . The system of  claim 1 , wherein said feedback data comprise sensory data relating to the transmitter and/or one or more components of the transmitter. 
     
     
         8 . The system of  claim 7 , wherein said sensory data comprise data relating to temperature and/or other environmental conditions. 
     
     
         9 . A method comprising:
 applying, during processing of an input signal for transmission, pre-distortion modification;   obtaining feedback data, wherein said feedback data relate to the transmitter and/or processing performed after application of said pre-distortion modification in the transmitter;   determining, based on said feedback data, one or more adjustments to said pre-distortion modification; and   applying said one or more adjustments to said pre-distortion modification.   
     
     
         10 . The method of  claim 9 , wherein said pre-distortion modification comprises modifying one or more characteristics of said input signal. 
     
     
         11 . The system of  claim 10 , wherein said one or more characteristics comprise at least one of: phase, frequency, and amplitude. 
     
     
         12 . The method of  claim 9 , comprising determining and/or applying said one or more adjustments periodically, based on one or more particular events, or conditionally. 
     
     
         13 . The method of  claim 9 , wherein said feedback data comprise data relating to or derived from one or more intermediate signals generated within the transmitter during said processing performed after application of said pre-distortion modification in the transmitter. 
     
     
         14 . The system of  claim 13 , comprising processing said one or more intermediate signals to obtain said data relating to or derived from said one or more intermediate signals. 
     
     
         15 . The method of  claim 9 , wherein said feedback data comprise sensory data relating to the transmitter and/or one or more components of the transmitter. 
     
     
         16 . The system of  claim 15 , wherein said sensory data comprise data relating to temperature and/or other environmental conditions. 
     
     
         17 . A system comprising:
 a transmitter comprising one or more circuits for use in controlling pre-distortion modification, said one or more circuits being operable to:
 process one or more signals generated within the transmitter during processing of an input signal that is performed after application of pre-distortion modification; and 
 generate based on said processing at least one control signal, wherein said output signal is used in adjusting said pre-distortion modification in the transmitter. 
   
     
     
         18 . The system of  claim 17 , wherein said processing of said one or more intermediate signals comprises applying a gain to a first intermediate signal, said gain being derived from a gain used and applied during said processing of said input signal that is performed after application of pre-distortion modification. 
     
     
         19 . The system of  claim 18 , wherein said processing of said one or more intermediate signals comprises:
 applying a delay to a second intermediate signal; and   subtracting, after said delay, said second intermediate signal from output of said application of gain to said first intermediate signal.   
     
     
         20 . The system of  claim 17 , wherein said processing of said one or more intermediate signals comprises applying analog-to-digital conversion, to generate said output signal as a digital signal.