Spectrum allocation optimization scheme for heterogeneous multiuser UWB systems

In this paper, we investigate a new multiuser cross-layer approach for the resource allocation in the high rate ultra-wideband (UWB) systems. This cross-layer scheme is based on an optimization problem defined for the multiuser resource allocation. The new approach consists in combining information provided by the PHY and MAC layers in order to achieve an efficient and low-complexity sub-band allocation under quality of service (QoS) requirements. PHY level is responsible for providing the channel quality of each user by exploiting the effective SINR method, while the MAC level is in charge of classifying the existing users in order to differentiate between two major classes: hard-QoS and soft-QoS. The new low-complexity scheme performance is close to that of the optimal solution and it outperforms the single-user solution adopted by the multi-band UWB systems.