Chaos communication system using MIMO technique

Abstract

Abstract-The security of chaos communication system is superior to other digital communication system, because it has characteristics such as non-periodic, wide-band, nonpredictability, easy implementation and sensitive initial condition. However, chaos communication system increases the number of transmitted symbols by spreading and transmitting information bits according to characteristic of chaos maps. So the research that improves data transmission speed is necessary for chaos communication system. If many antennas are applied to chaos communication system, the capacity of data is proportional to the number of antenna.so it is good way applying multiple-input and multiple-output (MIMO) to the chaos communication system. In this paper, we propose the correlation delay shift keying (CDSK) using 2´2 MIMO technique and evaluate BER performance over Rayleigh MIMO fading channel. Lastly we evaluate BER performance applying the boss map with 2x2 MIMO using MIMO detection algorithm such as zero forcing (ZF) and minimum mean square error (MMSE).

Adaptive blind equalization for a MIMO chaotic communication system

“…Its value is computed from the estimated signals within the window. The weight of the cross-correlation term in (19) was set to 2, although it can be made variable.…”

“…Therefore, an adaptive equalizer must be built. The cost function given in (19) is the basis to derive the proposed adaptive MIMO blind equalization algorithm. The steepest descent (SD) method will be exploited to update the MIMO equalizer coefficients because of its simplicity [25].…”

“…However, a SISO model is assumed for the channel in most works [12][13][14][15][16][17]. For the MIMO channel case, there are only a few nonblind algorithms developed by using training sequences [18,19]. In previous studies [18,20], a trellis diagram is substituted for a multiuser communication system.…”

“…Then the maximum likelihood estimates of the transmitted signals are obtained by the Viterbi algorithm. Correlation delay shift keying (CDSK) using the 2 × 2 MIMO technique to increase the capacity of data is proposed [19]. Two distinct statespace models are combined with a dual unscented Kalman filter for MIMO systems [21].…”