Correlation detection in chaos-based spread spectrum communication schemes

Using chaotic signals in spread spectrum communications (SSC) has advantages over traditional approaches. Chaotic signals are non-periodic, wideband, and more difficult to predict, reconstruct, and characterize than periodic carriers, which makes it more difficult to intercept and decode the information modulated upon them. However, many suggested chaos based-communication schemes do not provide processing gain (PG), a key feature of SSC schemes. Here we consider three communication schemes that provide PG. Their performance is studied for discrete time implementations. It is shown that the increase of the spreading factor beyond certain point degrades the performance.