Linearization of Efficiency-Optimized Dynamic Load Modulation Transmitter Architectures
Artikel i vetenskaplig tidskrift, 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.

dynamic load modulation (DLM)

linearization

power amplifier (PA)

Digital predistortion

transmitter.

efficiency

Författare

Haiying Cao

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Hossein Mashad Nemati

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

GigaHertz Centrum

Ali Soltani Tehrani

GigaHertz Centrum

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Thomas Eriksson

GigaHertz Centrum

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Jan Grahn

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Christian Fager

GigaHertz Centrum

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 58 873-881

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TMTT.2010.2042654