Capacity Maximization in Multiuser OFDMA -WMN System

This paper presents a novel fair scheme for resource sharing between nodes in OFDMA mesh networks. The problem is to maximize the overall system rate, under each user’s maximal power and minimum rate constraints. To solve the underlying problem, we propose an approach that maximizes system capacity based on available error-free instantaneous estimated channel state information at the transmitter node. Optimal power distribution between different sub channels is computed analytically, and it is shown that equal power allocation among subcarriers is almost near the optimum capacity. In this paper we also showed BER performance of LSE channel estimation by taking different pilot energies and modulation techniques. Keywords— OFDMA, WMN, Pilot signals, Lambert’s W-function.