Dynamic radio resource allocation and optimization for OFDMA cellular networks

This paper considered multiuser orthogonal frequency multiple access (OFDMA) scheme, which has been proposed as the transmission technique for 4th Generation (4G) cellular network. An optimum and dynamic radio resource (subcarrier and power) allocation scheme is proposed for OFDMA multiuser system. The proposed algorithm has considered a structured degree of flexibility among the services that can be provided from the network. The performance of the algorithm is evaluated through computer simulation, by applying it to multipath frequency selective fading channel with different number of users, SNR and channels conditions. The goal is to dynamically assign subcarrier and power while minimizing the total transmitted power under the constraint of guaranteed QoS to the users. The results shows that it outperform Static OFDM subcarrier and power allocation scheme achieves 3 dB SNR gain for a bit error rate of 10-2. Notable amount of reduction in system capacity outage probability has been observed, while exploiting the proposed dynamic algorithm compared with the existing algorithm due to its more flexible nature in resource allocation.