Performance Research of Multiuser Interference in Chaotic UWB System

Ultra-broadband system uses extremely short pulse transmission information, occupies extremely wide bandwidth, and has very low power spectral density. Because of its low power consumption, low interception rate, and the characteristics of good benefit against multi path fading, UWB system is especially suitable for short-distance wireless communication. To a great extent, the development of ultra wide band system depends on the effective multiple access technology, mainly to solve how to let more users share limited spectrum resources. The maximum system capacity is achieved by reasonably allocating and using the given spectrum. In this paper, we mainly study the multiple access technology of direct sequence spread spectrum UWB system based on digital chaotic sequence, and compare it with the real random sequence direct sequence spread spectrum ultra wide band system. The simulation results show that the DS-WWB system with digital chaotic sequence spread spectrum multi-access distribution is close to the actual random sequence system in terms of user capacity and bit error rate (BER). The real random sequence cannot be copied, and the digital chaotic sequence is easy to be produced and copied, so it has stronger physical realizability.