Method and apparatus for performing predistortion

Details Method and apparatus for performing predistortion Method and apparatus for performing predistortion

2009-04-06

2010-12-07

Nguyen, Hieu P (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C375S296000

Reexamination Certificate

active

07847631

ABSTRACT:
Embodiments are described herein to provide better predistortion solutions for the linearization of high power amplifiers, especially those with memory effects. Many embodiments involve a method in which a predistorted signal znis generated from input signal xnin accordance withzn=⁢∑k=1K⁢∏q=1Q⁢⁢Pkq⁡(xn-q-1)=⁢P11⁡(xn)⁢P12⁡(xn-1)⁢⁢…⁢⁢P1⁢Q⁡(xn-Q-1)+⁢P21⁡(xn)⁢P22⁡(xn-1)⁢⁢…⁢⁢P2⁢Q⁡(xn-Q-1)+…+⁢PK⁢⁢1⁡(xn)⁢PK⁢⁢2⁡(xn-1)⁢⁢…⁢⁢PKQ⁡(xn-Q-1)for K terms and Q−1 delays, wherein each Pkqis a complex valued function of a single complex variable. Also described are predistorter apparatus embodiments in which a predistorter includes complex multipliers for multiplying the value of each Pkqhaving the same value of k to produce K products and at least one adder for adding the K products to generate predistorted signal znfrom input signal xnin accordance with the equation above.

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