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A Time Misalignment Tolerant 2D-Memory Polynomials Predistorter for Concurrent Dual-Band Power Amplifiers

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4 Author(s)
Silong Zhang ; Department of Electronic Engineering, Tsinghua University, Beijing, China ; Wenhua Chen ; You-jiang Liu ; Fadhel M. Ghannouchi

This letter proposes a modified 2-D memory polynomial predistorter for concurrent dual band power amplifiers, which is tolerant to the time misalignment between the two bands. The new model is derived from the prior 2-D DPD model by substituting the interpolation expression into it. For performance validation, the proposed method is applied to a dual-band transmitter. In the presence of 4.87 samples time-misalignment existing between the two input signals, the proposed method achieves normalized mean square error of -40 dB and adjacent channel power ratio improvement of about 15 dB in the dual bands. Further experiment shows the proposed 2-D predistorter outperforms 2D-GMP in terms of complexity and signal quality.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:23 ,  Issue: 9 )