Linearization of Efficiency-Optimized Dynamic Load Modulation Transmitter Architectures
Journal article, 2010

In this paper, a detailed linearization procedure for dynamic load modulation (DLM) transmitter architectures is proposed for the first time. Compared with the conventional single-input/single-output digital predistortion (DPD) approach used with traditional power amplifiers (PAs), the proposed linearization scheme is based on a regular memory DPD in combination with an efficiency-optimized static one-to-two mapping inverse model, which constructs the predistorted input signals to the DLM transmitter. The time-alignment issue, which is very important to this dual-input architecture, is also considered. The proposed technique is demonstrated by a 1-GHz 10-W LDMOS PA that employs a varactor-based tunable matching network. A normalized mean square error of $-{hbox {35 dB}}$, and adjacent channel leakage ratio of $-hbox{43 dBc}$ is achieved, with an average power-added efficiency of 53% for a single-carrier WCDMA signal with 7-dB peak-to-average ratio. Finally, it is shown that the time-alignment sensitivity is relaxed when the proposed linearization scheme is used. This means that the overall complexity of the transmitter implementation can be reduced.

efficiency

power amplifier (PA)

linearization

transmitter.

Digital predistortion

dynamic load modulation (DLM)

Author

Haiying Cao

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Hossein Mashad Nemati

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Ali Soltani Tehrani

Chalmers, Signals and Systems, Communication, Antennas and Optical Networks

GigaHertz Centre

Thomas Eriksson

Chalmers, Signals and Systems, Communication, Antennas and Optical Networks

GigaHertz Centre

Jan Grahn

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

GigaHertz Centre

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN) 15579670 (eISSN)

Vol. 58 4 873-881 5438859

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TMTT.2010.2042654

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Latest update

4/5/2022 7