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In this paper, we investigate the use of a cross-layer allocation mechanismfor the high-rate ultra-wideband (UWB) systems. The aim of this paper istwofold. First, through the cross-layer approach that provides a new servicedifferentiation approach to the fully distributed UWB systems, we supporttraffic with quality of service (QoS) guarantee in a multi-user context.Second, we exploit the effective SINR method that represents thecharacteristics of multiple sub-carrier SINRs in the multi-band WiMediasolution proposed for UWB systems, in order to provide the channel stateinformation needed for the multi-user sub-band allocation. This new approachimproves the system performance and optimizes the spectrum utilization with alow cost data exchange between the different users while guaranteeing therequired QoS. In addition, this new approach solves the problem of thecohabitation of more than three users in the same WiMedia channel.

Cross-layer Resource Allocation Scheme for Multi-band High Rate UWB Systems