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Adaptive Hammerstein predistorter Using the Recursive Prediction Error Method

Tsinghua Science and Technology 2008年第1期13卷 17-22页

作者：李辉王德生陈兆武 Department of Electronic Engineering Tsinghua University

The digital baseband predistorter is an effective technique to compensate for the nonlinearity of power amplifiers （PAs） with memory effects. However, most available adaptive predistorters based on direct learning architectures suffer from slow convergence speeds. In this paper, the recursive prediction error method is used to construct an adaptive Hammerstein predistorter based on the direct learning architecture, which is used to linearize the Wiener PA model. The effectiveness of the scheme is demonstrated on a digital video broadcasting-terrestrial system. Simulation results show that the predistorter outperforms previous predistorters based on direct learning architectures in terms of convergence speed and linearization. A similar algorithm can be applied to estimate the Wiener PA model, which will achieve high model accuracy.

关键词： power amplifier predistorter Wiener system Hammerstein system recursive prediction error method

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Linearizing Wideband Wireless Transmitters Using Memory Effect Separation Based Linearization Techniques

Linearizing Wideband Wireless Transmitters Using Memory Effe...

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2009 3rd IEEE International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications

作者： Fadhel M. Ghannouchi Department of Electrical and Computer Engineering University of Calgary Calgary Canada

Wideband wireless transmitters will exhibit strong memory effects which heavily compromise the linearization performance of traditional memoryless predistorters. In this paper, the nonlinear behaviors of a wideband wireless transmitter are analyzed. According to the nonlinearity analysis, a novel memory effect separation based linearization technique is presented to linearize the wideband wireless transmitter. The novel predistorter is constructed with a static memoryless nonlinear block followed by a dynamic nonlinear block with memory. The static memoryless nonlinear block is utilized to pre-compensate the memoryless nonlinearity, whereas the dynamic nonlinear block is deployed to eliminate the memory effects. The validation results, carried out on a transmitter prototype for WCDMA systems, reveal that the proposed predistortion technique outperforms the traditional Hammerstein predistortion linearization scheme in suppressing the memory effects.

关键词： Hammerstein memory effect predistorter transmitter linearization.

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