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

© The Institution of Engineering and Technology
Received 19/10/2012, Published
Errata or comment

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.

Inspec keywords: neural nets; millimetre wave power amplifiers; gallium compounds; code division multiple access; III-V semiconductors; radio transmitters

Other keywords: neural network; nonlinearity joint mitigation; modulator I-Q imbalance; noise figure 18 dB; dual-band concurrent Doherty power amplifier; modulator imperfection; DC offset; inverse PA modelling; dual-band concurrent transmitter; wideband code division multiple access signal; power 10 W; concurrent dual-band transmitter; frequency 1960 MHz to 3500 MHz

Subjects: Radio links and equipment; Multiple access communication; Neural nets (circuit implementations); Amplifiers; Microwave circuits and devices

References

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Errata
An Erratum has been published for this content:
Errata: ‘Joint mitigation of nonlinearity and modulator imperfections in dual-band concurrent transmitter using neural networks’
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