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An improved LUT based DPD technique for nonlinear HPA in ATSC DTV system

机译:ATSC DTV系统中用于非线性HPA的基于LUT的改进DPD技术

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摘要

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.
机译:众所周知,高功率放大器(HPA)会在其饱和区域周围引起非线性失真。它会引起互调失真(IMD)和频谱重新增长的问题。因此,数字预失真(DPD)技术用于改善HPA的线性。本文提出了一种自适应DPD技术,该技术由基于查找表(LUT)的自适应更新算法组成,用于补偿HPA非线性。从仿真结果来看,与传统的LUT技术相比,该技术具有更好的收敛速度和频谱重生抑制能力。

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