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OFDM Error Vector Magnitude Distortion Analysis
Shingo YAMANOUCHI Kazuaki KUNIHIRO Hikaru HIDA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E89C
No.12
pp.18361842 Publication Date: 2006/12/01 Online ISSN: 17451353
DOI: 10.1093/ietele/e89c.12.1836 Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Emerging Microwave Techniques) Category: Active Circuits/Devices/Monolithic Microwave Integrated Circuits Keyword: power amplifiers (PAs), nonlinear distortion, error vector magnitude (EVM), wireless LAN, orthogonal frequencydivision multiplexing (OFDM),
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Summary:
We derived explicit formulas for evaluating the error vector magnitude (EVM) from the amplitude distortion (AMAM) and phase distortion (AMPM) of power amplifiers (PAs) in orthogonal frequencydivision multiplexing (OFDM) systems, such as the IEEE 802.11a/g wireless local area networks (WLANs) standards. We demonstrated that the developed formulas allowed EVM simulation of a memoryless PA using only a singletone response (i.e. without OFDM modulation and demodulation), thus enabling us to easily simulate the EVM using a harmonicbalance (HB) simulator. This HB simulation technique reduced the processing time required to simulate the EVM of a PA for the IEEE 802.11a standard by a factor of ten compared to a systemlevel (SL) simulation. We also demonstrated that the measured EVM of a PA module for the IEEE 802.11g could accurately be predicted by applying the measured static AMAM and AMPM characteristics to the derived formulas.


