Experimental Verification of the Performance of Chaos‐Based Asynchronous DS‐CDMA Systems

Recent theoretical investigations concern the application of chaos to DS‐CDMA system. The optimum spreading sequences have been analytically characterized to find that they can be generated with negligible approximation by a discrete‐time chaotic system. The adoption of these chaos‐based spreading sequences can be theoretically anticipated to produce a zero‐cost average 15% increase in the number of allocable users or a 15% increase in the signal‐to‐interference ratio controlling the communication quality. We here confirm theoretical predictions by building a DSP‐based prototype system comprising 7 transmitters and a receiver matched with one of the transmitters. It is worthwhile to be noticed, that, although still preliminary, these are the first presented experimental results confirming that the adoption of chaos‐based techniques allows to improve the performance of a communication system with respect to currently adopted techniques.