Characterized by their wideband, impulse-like autocorrelation and low cross-correlation properties, chaotic signals useful spread-spectrum signals for carrying digital information. It makes use of a very wide bandwidth signal to carry information at relatively low data rates, and have advantages such as low probability of interception, resistance to jamming, multiple-access capability and mitigation to multipath effect, which is very important in wireless scenarios. In recent years, much effort has been put on investigating systems with multi-access capability, which is a key feature of spread-spectrum communication system. In addition, the effectiveness of multiuser detection techniques, its main purpose is to reduce interference between users and hence improve the performance, evaluated in the context of multiple-access digital communications system.