In this paper, we investigate multi band OFDM based UWB wireless personal area networks (WPANs) over time varying channels. We first improve the efficiency of the data link layer. In order to maximize the link efficiency, we consider an immediate acknowledgement policy with dynamically and optimally selected frame sizes based on channel conditions. We then propose an opportunistic multiple-link-time scheduling algorithm, where the network controller determines the time allocation of individual connections within the IEEE 802.15.3 WPAN superframe structure. This algorithm determines time allocations proportional to the instantaneous efficiencies of operating links. Simulation results show that the proposed access method enhances the overall network performance compared to equal channel access schemes
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.