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An improved LUT based DPD technique for nonlinear HPA in ATSC DTV system
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- Authors
- Dong Hoon Kang, Hyo Bae Park, Sung Ik Park, Heung Mook Kim, Wang Rok Oh
- Issue Date
- 2010-03
- Citation
- International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB) 2010, pp.1-3
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- It is well known that high power amplifier (HPA) induces nonlinear distortion around its saturation region. It causes the inter-modulation distortion (IMD) and spectrum re-growth problems. Thus, the digital pre-distortion (DPD) technique is used to improve the linearity of HPA. This paper proposes the adaptive DPD technique, which is composed of a look-up table (LUT) based adaptive update algorithm, for the compensation of HPA nonlinearity. From the simulation results, the proposed technique shows the better convergence speed and spectrum re-growth suppression compared with conventional LUT technique.
- KSP Keywords
- Growth suppression, HPA nonlinearity, Intermodulation Distortion, Look Up Table(LUT), Nonlinear Distortion, Re-growth, Saturation region, Update algorithm, adaptive update, convergence speed, digital predistortion(DPD)