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Prediction of error vector magnitude using AM/AM, AM/PM distortion of RF power amplifier for high order modulation OFDM system

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5 Author(s)
J. H. Kim ; Electron. & Telecommun. Res. Inst., Daejeon, South Korea ; J. H. Jeong ; S. M. Kim ; C. S. Park
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This paper presents an analysis of error vector magnitude (EVM) performance of power amplifier using the amplitude/phase distortion coefficients derived from probability density function (PDF) of OFDM input signal. Amplitude coefficient values are calculated from the amplitude/phase distortion coefficients. The amplitude/phase distortion coefficient can be calculated from summation of the measured AM/AM (amplitude distortion) and AM/PM (phase distortion) data considered the probability of an input OFDM signal level. A complete analysis of the EVM model for output OFDM symbol with variable envelop through power amplifier can be derived from amplitude/phase distortion coefficients. To investigate, we use 1024(210) IFFT-OFDM signal based on 802.16e mobile system, 9.7dB peak to average power ratio (PAPR) at 0.01% CCDF and 10MHz overall occupation bandwidth, and the fabricated HBT MMIC power amplifier. The error ratio between the predicted EVM and measured EVM is as small as 1%.

Published in:

IEEE MTT-S International Microwave Symposium Digest, 2005.

Date of Conference:

12-17 June 2005