关键词: 多播, 资源分配, 多用户分集, 最优化, 最大最小问题

Abstract:

The system capacity of conventional multicast transmission in wireless system is limited by the worst user in the multicast group. A resource allocation algorithm for multicast system is proposed to overcome the capacity limitation by exploiting the multiuser diversity. Each subcarrier is allocated to some users with good channel state information. Due to the nonconvex property of the power allocation, power allocation based on gradient is adopted to optimize the power allocation locally. Simulation shows that the transmission rate is significantly improved by using our proposed algorithms, when compared to the traditional multicast transmission scheme.

Key words: multicast, resource allocation, multiuser diversity, optimization, max-min