Analysis of the Effect of the I/Q Base-Band Filter Mismatch in an OFDM Modem
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In this paper, we provide a simple closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of synchronization errors (i.e. phase noise, carrier frequency offset, Doppler spread, sampling frequency offset, and timing jitter), transmitter I/Q imbalance, receiver I/Q imbalance, and amplifier nonlinearity of the high power amplifier (HPA). This formula describes explicitly the various parameters with the system performance. SNR degradation factor is plotted versus SNR for different combinations of these imperfections. This degradation measure reflects the proper parameters selection to specify OFDM system.