Subcarrier and bit allocation for real-time services in multiuser OFDM systems

We consider the problem of resource allocation (in terms of subcarrier, bit and corresponding power) for QoS provisioning to real-time services in multiuser OFDM systems. A novel dynamic subcarrier and bit allocation algorithm is proposed for real-time services in multiuser OFDM systems. The proposed algorithm takes advantage of the instantaneous channel gain in subcarrier and bit allocation properly without relying on the nonlinear optimization technique, which is usually used in subcarrier and bit allocation when the instantaneous channel gain is considered. Therefore it avoids the corresponding computational complexity of the nonlinear optimization. The performance of the proposed algorithm is compared to other existing algorithms.