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Error Vector Magnitude Measurement Accuracy and Impact on Spectrum Flatness Behavior for OFDM-Based WiMAX and LTE Systems

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Executive Summary

A controversial technical discussion is raised whether WiMAX or LTE is the most promising 4G technology. Since LTE and WIMAX as 4G systems have both adopted OFDM as the preferred physical technology for better spectrum efficiency, the RF parts of those systems have to face major challenges. Hence the extensively applied Error Vector Magnitude (EVM) can be used as an effective and efficient method to evaluate the RF performance of those digitally modulated communication systems. Considering an optimal subcarrier allocation in OFDM-based systems Spectrum Flatness is an important quality characteristic, which has been rarely examined in the past.

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