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A new digital baseband predistortion of wideband power amplifiers with improved memory effects is presented and investigated. Distortion compensation is increased by implementing proposed iterative digital baseband injection technique. Frequency-domain equalization in baseband is developed to minimize memory effects. The non-linear and memory parts of the proposed linearizer are implemented in baseband without additional feedback loop. The spectral regrowth improvement of 20 dB for a 5-MHz 16-QAM signal and a 10 dB reduction of 8 MHz offset adjacent channel power ratio (ACPR) are achieved. Experimental results are presented to validate the argument.
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Date of Conference: 18-22 Jan. 2009