A new filterbank-based complex CDMA system for transmission in underwater acoustic channels

In this paper a novel Alamouti-type coding scheme is presented for the complex CDMA OFDM/OQAM system based on Walsh-Hadamard (W-H) spreading codes. The proposed scheme introduces an approach to gain time diversity in complex CDMA filterbank system. This approach is in particular effective for transmission over doubly selective channels. System performance is evaluated in an underwater acoustic (UWA) channel through computer simulations and the results demonstrate that the new developed system outperforms the conventional complex CDMA OFDM/OQAM system at high SNRs without compromising on data rate.

[1]  Pierre Siohan,et al.  Analysis and design of OFDM/OQAM systems based on filterbank theory , 2002, IEEE Trans. Signal Process..

[2]  Mohammad Javad Omidi,et al.  Time-Domain Block and Per-Tone Equalization for MIMO–OFDM in Shallow Underwater Acoustic Communication , 2013, Wirel. Pers. Commun..

[3]  Paul A. van Walree,et al.  A Discrete-Time Channel Simulator Driven by Measured Scattering Functions , 2008, IEEE Journal on Selected Areas in Communications.

[4]  David Tse,et al.  Fundamentals of Wireless Communication , 2005 .

[5]  P. Willett,et al.  MIMO-OFDM for High-Rate Underwater Acoustic Communications , 2009, IEEE Journal of Oceanic Engineering.

[6]  Maurice G. Bellanger,et al.  CDMA Transmission with Complex OFDM/OQAM , 2008, EURASIP J. Wirel. Commun. Netw..

[7]  Maryline Hélard,et al.  Spatial Data Multiplexing Over OFDM/OQAM Modulations , 2007, 2007 IEEE International Conference on Communications.

[8]  Pierre Siohan,et al.  The Alamouti Scheme with CDMA-OFDM/OQAM , 2010, EURASIP J. Adv. Signal Process..