Title :
Low-complexity Doppler compensation for OFDM-based underwater acoustic communication systems
Author :
Abdelkareem, A.E. ; Sharif, B.S. ; Tsimenidis, C.C. ; Neasham, J.A. ; Hinton, O.R.
Author_Institution :
Sch. of Electr., Electron. & Comput. Eng., Newcastle Univ., Newcastle upon Tyne, UK
Abstract :
In this paper, low-complexity Doppler-shift compensation for orthogonal frequency division multiplexing (OFDM) suitable for underwater acoustic communication (UWAC) is proposed. This algorithm exploits the integer part and the fractional part of the time expansion/compression measured within a fraction of a sample period in each OFDM to jointly estimate the Doppler-shift and the residual carrier frequency offset (CFO). Unlike block-Doppler compensation, the proposed scheme increases the throughput by utilizing single chirp pulse as a preamble. In addition, the Doppler-shift variation within the OFDM symbol is dealt with by adopting a smoothing filter. The proposed scheme was investigated in an experiment, evaluating the system performance over a range of 1 km in the North Sea during the summer of 2009.
Keywords :
Doppler shift; OFDM modulation; underwater acoustic communication; OFDM-based underwater acoustic communication system; UWAC; low-complexity Doppler-shift compensation; orthogonal frequency division multiplexing; residual CFO; residual carrier frequency offset; single chirp pulse; smoothing filter; Complexity theory; Doppler shift; Estimation; OFDM; Receivers; Timing;
Conference_Titel :
OCEANS, 2011 IEEE - Spain
Conference_Location :
Santander
Print_ISBN :
978-1-4577-0086-6
DOI :
10.1109/Oceans-Spain.2011.6003384
