Energy-efficient resource allocation for multiband UWB communication systems

The emerging ultra-wideband (UWB) system offers a great potential for the design of high-speed short-range communications. However, UWB faces a significant challenge in achieving a low transmit power level, while assuring an adequate system performance. An efficient management of the limited power is thus a key feature to fully exploit the advantages of UWB. In this paper, a cross layer multiuser multiband UWB scheme is proposed to obtain the optimal subband and power allocation strategy. Optimization criteria involve minimization of power consumption under the constraints on the packet error rate, transmission rate, and FCC regulations. To reduce the problem complexity, which is found to be NP hard a computationally inexpensive suboptimal approach is developed. Simulation results under UWB channel model specified in the IEEE 802.15.3a standard show that the proposed algorithm achieves comparable performance to that of the complex optimal full search approach, and it can save up to 61% of transmit power compared to the multiband scheme in the standard proposal.