Abstract
Code-division multiple access (CDMA) has played a remarkable role in the field of wireless communication systems, and its capacity and security requirements are still being addressed. Collaborative multiuser transmission and detection are a contemporary technique used in CDMA systems. The performance of these systems is governed by the proper accommodation of the users and by proper synchronization schemes. The major research concerns in the existing multiuser overloaded CDMA schemes are (i) statistically uncorrelated PN sequences that cause multiple-access interference (MAI) and (ii) the security of the user’s data. In this paper, a novel grouped CDMA scheme, the 1D-Bernoulli chaotic collaborative CDMA (BCC-CDMA), is introduced, in which mutually orthogonal chaotic sequences spread the users’ data within a group. The synchronization of multiple groups in this scheme has been analyzed under MAI limited environments and the results are presented. This increases the user capacity and also provides sufficient security as a result of the correlation properties possessed by the chaotic codes. Multigroup synchronization is achieved using a 1D chaotic pilot sequence generated by the Bernoulli Map. The mathematical model of the proposed system is described and compared with the theoretical model of the synchronization in CDMA, the simulation results of which are presented.
Highlights
The demand for high capacity wireless systems is increasing day by day
Nonlinear dynamic chaotic sequences provide message concealment using chaotic phase shift keying techniques [6, 15]. After analyzing several such techniques, the proposed scheme addresses the synchronization of multiple groups in a highly secure and high capacity chaotic grouped Code-division multiple access (CDMA) system using chaotic sequences which are used as the carrier and the pilot
A highly secure and high capacity grouped scheme is proposed for the CDMA system that accommodates a higher
Summary
The demand for high capacity wireless systems is increasing day by day. Wireless communication system generations including the 3rd generation (3G), the 4th generation (4G), and the upcoming 5th generation (5G) strive to achieve the ever increasing needs for faster data transfer and higher security. The collaborative CDMA scheme increases the capacity by grouping a small number of users that share the same pseudorandom (PN) spreading sequence and enables group spreading and despreading operations [1]. Various methods have been proposed to obtain binary sequences from chaotic trajectories generated by nonlinear ergodic maps [11] Synchronization within such chaos based DS-CDMA systems is an active area of research due to the lack of robust synchronization techniques [12, 13]. Nonlinear dynamic chaotic sequences provide message concealment using chaotic phase shift keying techniques [6, 15] After analyzing several such techniques, the proposed scheme addresses the synchronization of multiple groups in a highly secure and high capacity chaotic grouped CDMA system using chaotic sequences which are used as the carrier and the pilot.
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