Time domain synchronization orthogonal frequency division multiplexing technique (TDS-OFDM) can offer better efficiency in spectrum and energy use than standard cyclic prefix and zero padding schemes by replacing the guard interval with a pseudorandom noise sequence. In this paper, a type of frequency domain pseudorandom noise training sequence is proposed for underwater acoustic channel as a TDS-OFDM training sequence and used to update the Doppler scaling factor estimation obtained by using a preamble signal after the initial system is synchronized. A significant improvement can also be achieved in bit error rate performance by the use of the compressed sensing theory to estimate underwater acoustic channel impulse response based on the proposed TDS-OFDM training sequence. Furthermore, the guard interval amplitude in TDS-OFDM can be reduced to improve the resultant energy efficiency and signal-to-interfered-signal ratio. The proposed techniques are carefully developed based on intuitive analysis and combined in a receiver design. Such receiver is evaluated in a measured underwater acoustic channel and a simulated channel. Both technical analysis and experiment results show significant and consistent performance improvements in spectral and energy use.

Item Type:	Refereed Article
Keywords:	underwater acoustic (UWA) communication, time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM), time reversal (TR) , compressed sensing (CS), channel estimation, spectrum and energy efficiency
Research Division:	Engineering
Research Group:	Electrical and Electronic Engineering
Research Field:	Signal Processing
Objective Division:	Information and Communication Services
Objective Group:	Communication Networks and Services
Objective Field:	Mobile Data Networks and Services
Author:	Esmaiel, H (Mr Hamada Esmaiel)
Author:	Jiang, D (Dr Danchi Jiang)
ID Code:	119842
Year Published:	2017
Web of Science® Times Cited:	1
Deposited By:	Engineering
Deposited On:	2017-08-07
Last Modified:	2018-06-18
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