Title :
A new filterbank-based complex CDMA system for transmission in underwater acoustic channels
Author :
Rafiee-Nia, Fahimeh ; Zamiri-Jafarian, Hossein
Author_Institution :
Electr. Eng. Dept., Ferdowsi Univ. of Mashhad, Mashhad, Iran
Abstract :
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.
Keywords :
Hadamard codes; OFDM modulation; channel bank filters; code division multiple access; quadrature amplitude modulation; underwater acoustic communication; wireless channels; Alamouti-type coding scheme; CDMA OFDM-OQAM system; SNR; UWA channel; W-H spreading code; Walsh-Hadamard spreading code; computer simulation; doubly selective channel; filterbank-based complex CDMA system; gain time diversity; underwater acoustic channel; Bit error rate; Delays; Doppler effect; Multiaccess communication; OFDM; Scattering; Vectors; complex CDMA OFDM/OQAM; filterbank multicarrier; time diversity; underwater acoustic channel;
Conference_Titel :
Electrical Engineering (ICEE), 2014 22nd Iranian Conference on
Conference_Location :
Tehran
DOI :
10.1109/IranianCEE.2014.6999774
