Guard time optimization for OFDM transmission over fading channels
نویسنده
چکیده
In this paper, we consider the transmission of an orthogonal frequency division multiplexed (OFDM) signal over a channel with timevarying frequency-selective fading and additive white Gaussian noise (AWGN). Due to channel dispersion, intersymbol and intercarrier interference will occur at the receiver. To reduce this interference, a guard time is added as a cyclic prefix. The system performance is defined as the signal-to-noise ratio (SNR) at the receiver, after demodulation. We investigate the system performance for various delay spreads and coherence times, and optimize this performance as function of the guard time.
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