Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Nonlinear Distortion Analysis of 2.4GHz Power Amplifier for IEEE 802.11g OFDM Wireless LAN

IEEE 802.11g OFDM 무선랜용 2.4GHz 전력증폭기의 비선형 왜곡분석

  • Oh Chung Gyun (Dept. of Electronics Engineering, University of Incheon) ;
  • Choi Jae Hong (Dept. of Electronics Engineering, University of Incheon) ;
  • Koo Kyung Heon (Dept. of Electronics Engineering, University of Incheon)
  • Published : 2005.03.01
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Abstract

The OFDM modulation and transmission block have been modeled in order to analyse the relationship between the 2.4GHz power amplifier distortion and output ACPR for the IEEE 802.11g wireless LAN. The nonlinear characteristic of the power amplifier has been modeled as AM-to-AM and AM-to-PM using the behavioral model, and the output spectrum is analysed with the phase distortion variation. Also, amplifier back-off value from P1dB to satisfy the required IEEE 802.11g standard spectrum mask s been simulated with modeled phase distortion, and the simulation data have been compared to the measured result by using the pre-distortion technique.

무선랜용 전력증폭기의 비선형특성과 출력 ACPR 관계를 분석하기위해, 최대 54Mbps의 전송속도를 가지는 IEEE 802.11g OFDM 변조부와 송신부를 모델링하였다. 2.4GHz 전력증폭기의 비선형특성은 behavioral model을 이용하여 An-to-AM과 AM-to-PM으로 모델링하였으며, 위상 왜곡특성에 따른 출력스펙트럼 특성을 해석하였다. IEEE 802.11g 무선랜 시스템의 요구 출력스펙트럼 마스크를 만족하기위한 P1dB로부터 back-off값을 구하기 위하여 모델링한 위상왜곡 크기에 따른 전력증폭기의 ACPR 특성을 시뮬레이션하고 사전위상 왜곡방식을 이용하여 증폭기의 위상왜곡을 변화시키며 측정한 결과와 시뮬레이션 특성을 비교 제시하였다.

Keywords

References

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