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Comparison of QPSK and 64QAM EVM for an OFDM WLAN signal at 2.4 GHz and 4.9 GHz in a multipath environment

By: Koepke, G.; Myslinski, M.; Kenney, J.S.; Remley, K.A.; McKinley, M.D.; Johnk, R.T.; Camell, D.;

2009 / IEEE / 978-1-4244-3647-7

Description

This item was taken from the IEEE Conference ' Comparison of QPSK and 64QAM EVM for an OFDM WLAN signal at 2.4 GHz and 4.9 GHz in a multipath environment ' Theoretically, EVM is the same for all modulation types if the channel, transmitter, and receiver are static, the signal power remains constant, and normalization is used such that the mean-square value over all symbols is unity. We confirmed this experimentally in low- and medium-distortion linear, time-invariant environments. Furthermore, we showed that in a static multipath environment, the EVM levels for QPSK and 64QAM modulations agree to within 1 % to 3 % when the EVM value is less than 10 %. This implies that the EVM for QPSK modulation could predict the EVM for a 64QAM modulated signal.