关键词: 正交频分复用, 组播, 子载波分配, 功率分配

Abstract: The authors propose a resource allocation algorithm for orthogonal frequency division multiplexing (OFDM) system to provide QoS guarantee for multicast and unicast service concurrently. The optimization objective is to maximize the sum rate of the unicast users under the constraints of power and the minimal rate requirements of multicast service, which can be solved by traditional two-step approach. To decrease the complexity, a greedy-based approach is proposed. According to theoretical analysis and simulation results, the performance of the proposed algorithm is close to the two-step approach meanwhile the complexity is effectively decreased. In summary, the proposed algorithm can balance the performance and complexity well and is suitable to be applied to the practical scenario.

Key words: orthogonal frequency division multiplexing (OFDM), multicast, subcarrier allocation, power allocation