Constrained resource allocation for OFDMA wireless mesh networks with limited feedback

Adaptive resource allocation has been shown to provide performance gain for OFDMA wireless mesh networks (WMNs) with full channel state information (CSI) at mesh router (MR) and mesh clients (MCs). However, full CSI at MR is rarely possible due to limited feedback resource and feedback delay. In this paper, we present more practical resource allocation strategies for OFDMA WMNs where the MR has only limited channel information in terms of average channel gain or channel distribution information (CDI). The merits of the well known Lagrange dual approach and the Lambert-W function are combined to find the optimal allocation. By using the Lambert-W function, the optimal resource allocation is expressed in closed form and can quickly be determined without resorting to complex algorithms since a number of popular mathematical softwares, including Matlabs, contain the Lambert-W function as an optimization component. Simulation results are provided to compare the performance of the proposed schemes with other allocation schemes.