Patent ID: 7848717

Claim:
A method for out-of-band predistortion linearization, the method comprising: dividing input base band or IF signals into a first set of two branches, including in-band signals and out-of-band signals; processing said in-band signals to form RF signals; processing said out-of-band signals to form out-of-band predistortion signals for pre-compensating said in-band signals, wherein said processing includes extracting a power envelope from said out-of-band signals; dividing said out-of-band signals into a second set of two branches of signals; processing one branch of said second set of two branches of signals to form second harmonic predistortion signals; processing the other branch of said second set of two branches of signals, upon which power envelope extraction has been performed, to form envelope injection predistortion signals with a low frequency; and adding said second set of two branches of signals that have been processed, and taking the result as said out-of-band predistortion signals; and adding said RF signals with said out-of-band predistortion signals, and taking the result as an input of a RF power amplifier.