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Joint mitigation of nonlinearity and modulator imperfections in dual-band concurrent transmitter using neural networks

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4 Author(s)
Rawat, M. ; Dept. of Electr., iRadio Lab., Calgary, AB, Canada ; Rawat, K. ; Younes, M. ; Ghannouchi, F.

Reported, for the first time is a predistortion scheme for a concurrent dual-band transmitter with a dual-band concurrent Doherty power amplifier in the presence of modulator I/Q imbalance and DC offsets. Inverse PA modelling for predistortion is achieved using real valued time delayed neural networks. The model has been validated for a 10 W GaN based dual-band concurrent Doherty power amplifier for wideband code division multiple access signals at 1960 and 3500 MHz, respectively, and an adjacent channel power ratio improvement of 18 dB is reported.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 4 )