Affiliation:
1. Jiangsu University of Science and Technology
Abstract
In this paper, we propose a new improved MC-CDMA system which combines spreading codes from Quasi-Orthogonal Matrix with Orthogonal Complex Wavelet Division Multiplexing (OCWDM). The system is implemented by complex wavelet filters which are able to lower computational complexity and increase flexibility. Novel spreading codes from Quasi-Orthogonal Matrix can be expanded randomly. It can increase user number hugely in system. Improved MC-CDMA named OCWDM-CDMA has much higher frequency spectrum efficiency and high data rate than conventional MC-CDMA. The system also has better BER performance in Gaussian channel than conventional system for much more users.
Publisher
Trans Tech Publications, Ltd.
Reference7 articles.
1. Scott. Linfoot. IEEE Transaction on Consumer Electronics. Vol. 54, No. 3, August (2008), pp: 1042-1047.
2. N. G. Kingsbury. A dual-tree complex wavelet transform with improved orthogonality and symmetry properties,. in Proc. IEEE Int. Conf. Image Process. ICIP. (2000), pp: 375-378.
3. N. G. Kingsbury. Complex wavelets for shift invariant analysis and filtering of signals,. J. Appl. Comput. Harm. Anal., vol. 10, no. 3, May (2001), pp: 234–253.
4. . Hara, S., and Prasad, R. IEEE Commun. Mag. (1997), 35, (12), pp: 126–133.
5. V.M. DaSilva and E.S. Sousa. Performance of orthogonal CDMA codes for quasisynchronous communication systems". in Proc. of IEEE ICUPC, 93. Theo, Workshop, Ottawa, Canada. Oct. (1993): 995-999.