Chaotic vs Classical Codes for Synchronous TH- UWB Multiple-Access System in IEEE 802.15.4a Multi-path Channel

This paper aims to evaluate the impact of chaotic sequences on the performance of synchronous TH-UWB system when they are used as multiple access keys. We considered the realistic multi-path channel described in the norm IEEE 802.15.4a. Firstly, we will prove the dependence of the performance on the used multiple access codes by expressing the power of multi-user interference with the aid of the Average of Squared Collision Number (ASCN) criteria of the used code set, Then the ASCN of chaotic sequences and the one of classical Gold sequences are computed and compared. The results show that chaotic sequences have better ASCN for some maps. To analyse how this result is reflected on the TH-UWB System performance we simulated the system in multipath channel context and with conventional receiver in the two cases, when chaotic and Gold sequences are used for multiple access. We found that the performances in term of binary error rate are better for some chaotic sequences.