Techniques for Non-Coherent Detection in Chaos-Based Digital Communication Systems

Theoretically, coherent systems perform better than non-coherent systems, provided that the receiver can faithfully reproduce the same chaotic basis signals sent by the transmitter. However, the main technique that allows the reproduction of chaotic basis signals in the receiver, normally referred to as chaos synchronization, has yet to be proven feasible for low signal-to-noise conditions. Therefore, as the practicality of coherent systems is uncertain, researchers have considered non-coherent techniques for chaos-based communications [Kennedy and Kolumbán (2000a)]. The most widely studied non-coherent chaos-based digital communication system is the differential chaos-shift-keying (DCSK) system, which has been studied to some depth in the previous chapters. In this chapter, we review the basic requirements for non-coherent detection in chaos-based digital communication systems and describe a simple alternative approach for achieving the requirements.