Adaptive digital predistortion for wideband high crest factor applications based on the WACP optimization objective: an extended analysis

Laki, Bradley Dean, and Kikkert, Cornelius Jan (2013) Adaptive digital predistortion for wideband high crest factor applications based on the WACP optimization objective: an extended analysis. IEEE Transactions on Broadcasting, 59 (1). pp. 136-145.

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This paper provides an extended analysis of the adaptive digital predistortion technique initially proposed and conceptually overviewed in [1]. This digital predistortion technique is suitable for wideband high crest factor applications (digital audio broadcasting, digital video broadcasting-terrestrial & wideband code division multiple access high power transmitters) and overcomes the technical deficiencies of the traditional direct learning method. Specifically, predistortion filter parameter estimation is modeled as a generic mathematical optimization problem instead of a linear regression problem. In addition, the optimization objective is derived in the frequency instead of the time domain. A hybridly pruned Volterra series with memory is used to implement the predistortion filter. Hybrid pruning leads to a small optimization vector space, whilst the predistortion filter memory makes the method well suited to wideband applications. Given that predistortion filter parameter estimation does not rely on known test signals being injected into the transmitter, the method is on-air adaptive. Implementation aspects of the technique not covered in [1], but requiring extended coverage in this paper, include selection of mathematical optimization algorithms, predistortion filter memory estimation, weighted adjacent channel power weighting function application, and on-air adaption performance. Results obtained from actual hardware are presented.

Item ID: 32432
Item Type: Article (Research - C1)
ISSN: 1557-9611
Keywords: adjacent channel power, code division multiple access (CDMA), digital audio broadcasting (DAB), digital video broadcasting-terrestrial (DVB-T), linearization techniques, nonlinear distortion, orthogonal frequency-division multiplexing (OFDM), optimization, power amplifiers, predistortion, radio transmitters, Volterra series
Date Deposited: 23 Apr 2014 01:38
FoR Codes: 09 ENGINEERING > 0906 Electrical and Electronic Engineering > 090609 Signal Processing @ 75%
10 TECHNOLOGY > 1005 Communications Technologies > 100510 Wireless Communications @ 25%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8904 Media Services > 890405 Radio and Television Broadcasting @ 100%
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