Chaos-Based Digital Communication Systems: Operating Principles, Analysis Methods, and Performance Evaluation
Multi-user detection for DS-CDMA communications
IEEE Communications Magazine
| Hi-index | 0.00 |
Remarkable research efforts have been invested in recent years on the chaotic communications schemes. In this paper we propose a modulation technique based on QAM-4 (Quadrature Amplitude Modulation). The data is split into I and Q channels. Each channel is spread by chaotic sequences generated over a fixed time interval by a specific digital chaotic system. There are two principal advantages of introducing the chaos in a communication scheme. The first is that it allows signals to be transmitted in a secure way, so that the signal could be perceived as a noise for a potential intruder. Secondly, the spread-spectrum characteristics of the signal improve the noise rejection propreties. A new coherent receiver structure is presented to synchronize each channel. Simulation results are presented to show the effectiveness of the proposed scheme.