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Innovative DSP Implementation of Adaptive RF Power Amplifier Linearizers

I.K. Lau, C.G. Englefield, P.A. Goud
Proceedings of Wireless '94 Conference, Calgary, AB., Vol. II, N-3, pp. 653-661, July 1994

The performance of an enhanced RF power amplifier linearization method is investigated experimentally. The linearization method is an extension of the complex gain predistortion technique, and is implemented on a digital signal processor (DSP). Three complex baseband signals are sampled simultaneously; namely, the quadrature modulated input and feedback signals, and also the predistorted signal. Using these sampled data, a look-up-table (LUT) with new complex predistortion values is calculated in a time efficient manner. Input data bit rates of 30.3 kb/s and LUT updating rates of 33 tables/s were achieved using a TMS320C30 DSP. This linearization method reduced the out-of-band spectral distortion by up to 28 dB in the first adjacent channel.

CONTACTS: Keong Lau, Colin Englefield, Paul Goud
SUBJECTS: RF Circuits and Systems
TYPE: Conference Publication
PUBLISHED: 1994

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