Effect of Carrier Frequency Offset on Frequency-Domain Differential Demodulation in OFDM Systems
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چکیده
This paper analyzes the effect of the carrier frequency offset on frequency-domain differential demodulation in orthogonal frequency division multiplexing (OFDM) systems. The exact signal-to-noise ratio (SNR) expression is derived in the presence of the frequency offset. Using this exact SNR expression, the SNR degradation due to the frequency offset is quantified and the symbol error rate (SER) performance is evaluated. The effect of the frequency offset on frequency-domain differential demodulation is compared with that on coherent demodulation. It is found that frequency-domain differential demodulation is less immune to the carrier frequency offset compared to coherent demodulation. The analysis in this paper not only provides insights into how the carrier frequency offset affects the system performance, but also provides guidelines on the amount of tolerable frequency offset to obtain the desired system performance.
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تاریخ انتشار 2007