Data detection techniques for OFDM signals over Doppler-distorted channels

Abstract

Signal scaling due to Doppler in underwater acoustic communications results in inter-carrier interference (ICI) and severely degraded detection performance in OFDM based systems in the absence of interference mitigation. Using a recently proposed partial FFT demodulation technique [5], where several FFT demodulators operate over parallel non-overlapping segments, two efficient algorithms which reduce ICI and error probability significantly are proposed. Numerical simulations demonstrate an improvement of several dB over conventional OFDM detection techniques at the cost of a small increase in complexity.