Narrowband interference suppression in underwater acoustic OFDM system

Orthogonal Frequency Division Multiplexing (OFDM) is well known as a very attractive technology for communication. However, because of the spectral leakage in discrete Fourier transform, the spectrum of narrowband interference is spreaded to impact adjacent sub-carriers in OFDM system. Receiver window function was previously implemented to suppress narrow-band interference. In this paper, different kinds of receiver window functions were compared in the underwater acoustic OFDM system. The results of simulation and experiment show that the raised cosine window can suppress NBI and reduce the BER.