Title :
Parameter study of OFDM underwater communications system
Author :
Kim, Byung-Chul ; Lu, I-Tai
Author_Institution :
Center for Adv. Technol. in Telecommun., Polytech. Univ., Farmingdale, NY, USA
Abstract :
Design criteria and analysis procedures for a practical OFDM underwater communications system are presented. A new broadband underwater channel model with Doppler time scaling effect is developed. A two-dimensional MMSE scheme using time and frequency pilots is employed for channel estimation. Doppler frequency shift is estimated using cyclic prefix and is compensated by a digital sampling rate conversion procedure. Numerical simulations demonstrate that the OFDM technique is robust with respect to frequency selectivity and time selectivity
Keywords :
Doppler shift; OFDM modulation; broadband networks; compensation; frequency estimation; least mean squares methods; underwater acoustic communication; Doppler frequency shift; Doppler time scaling effect; OFDM underwater communications system; analysis procedures; broadband underwater channel model; channel estimation; cyclic prefix; design criteria; digital sampling rate conversion procedure; frequency selectivity; time selectivity; two-dimensional MMSE scheme; Acoustic propagation; Bandwidth; Channel estimation; Doppler shift; Frequency estimation; Narrowband; OFDM; Sea surface; Underwater acoustics; Underwater communication;
Conference_Titel :
OCEANS 2000 MTS/IEEE Conference and Exhibition
Conference_Location :
Providence, RI
Print_ISBN :
0-7803-6551-8
DOI :
10.1109/OCEANS.2000.881774
