Title :
Concurrent dual-band digital predistortion for power amplifier based on orthogonal polynomials
Author :
Quindroit, Christophe ; Naraharisetti, Naveen ; Roblin, Patrick ; Gheitanchi, Shahin ; Mauer, Volker ; Fitton, Mike
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
This paper presents a 2D digital predistortion system to compensate for the nonlinearity of the power amplifier driven by a concurrent dual-band signal. In order to improve the numerical stability of the system, we introduce a new orthogonal polynomial basis. The numerical stability of the new representation is compared to the conventional polynomial. An experimental test bench employing an FPGA linked to two mixed signal system boards is also presented. Performances are evaluated with an experimental test setup using a 10W peak power amplifier and a dual-band signal (single-carrier WCDMA and 3-carrier WCDMA) center frequency spaced by 310MHz. Experimental results show numerical stability improvement with the new 2D orthogonal basis.
Keywords :
code division multiple access; field programmable gate arrays; mixed analogue-digital integrated circuits; numerical stability; power amplifiers; FPGA; concurrent dual band digital predistortion; conventional polynomial; frequency 310 MHz; mixed signal system boards; numerical stability; orthogonal polynomials; power 10 W; power amplifier; single carrier WCDMA; three carrier WCDMA; Dual band; Field programmable gate arrays; Indexes; MATLAB; Polynomials; Predistortion; Stability analysis; Power amplifiers; concurrent dual-band; orthogonal polynomials; predistortion;
Conference_Titel :
Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4673-6177-4
DOI :
10.1109/MWSYM.2013.6697705
