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Hierarchical Power and Subcarrier Allocation for Multicarrier Two-Layer Chip-Interleaved Multiuser UWB System

A two-layer interleaving scheme is proposed for the downlink transmission of a multicarrier chip-interleaved UWB system. In this scheme data from different users are separated in the frequency-domain while the different data streams for the same user are separated in the interleaver-domain. A joint power and subcarrier allocation algorithm is developed to exploit the multiuser diversity and thereby improve the system performance. It is seen from the simulation studies that the joint power and subcarrier allocation scheme can significantly improve the system performance.