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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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- Authors
- Joon H. Kim, Jae H. Jeong, Seong M. Kim, Chul S. Park, Kwang C. Lee
- Issue Date
- 2005-06
- Citation
- IEEE MTT-S International Microwave Symposium 2005, pp.2027-2030
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- 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%. © 2005 IEEE.
- KSP Keywords
- Distortion coefficients, High order modulation, Input signal, MMIC power amplifier, Mobile system, OFDM signal, OFDM systems, Peak-to-Average-Power-Ratio(PAPR), Phase distortion, Probability Density Function, RF power amplifier