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Design of a Predistorter with Multiple Coefficient Sets for the Millimeter-Wave Power Amplifier and Nonlinearity Elimination Performance Evaluation

다중계수 방식을 적용한 밀리미터파 대역용 전력증폭기의 사전왜곡기 설계 및 비선형성 보상 성능 평가

  • Received : 2015.07.24
  • Accepted : 2015.08.31
  • Published : 2015.08.31

Abstract

Recently, mobile communication systems using the millimeter-wave frequency band have been proposed, and the importance of efficient compensation of the nonlinearity caused by 60 GHz high-power amplifiers(HPAs) is increasing. In this paper, we propose a predistorter structure based on multiple coefficient sets which are separately used to different ranges of input power values. These ranges correspond to varying levels of nonlinearity characteristics. The structure is applied to the 60 GHz HPA FMM5715X and the performance of correcting the nonlinearity of LTE signals is evaluated. Evaluation results using a hardware testbed demonstrate that the proposed predistorter structure achieves the maximum of 6 dB gain over the conventional method in terms of the adjacent channel leakage ratio(ACLR).

Keywords

Millimeter-Wave;Predistorter;Linearization;HPA;Multiple Coefficients

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Acknowledgement

Supported by : 미래창조과학부, 한국연구재단