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针对无线多播系统中传输速率受限于多播组中最差用户信道容量的问题,提出一种组内资源分配算法.在考虑用户之间不同速率需求的前提下,对多播组内用户进行子载波分配和功率分配,来最大化多播系统归一化速率.子载波分配算法利用每个子载波上多播用户之间的多用户分集,将子载波分配给该子载波上性能较好的多个用户.功率分配算法采用基于梯度的功率分配方式对各子载波上所分配的功率做局部优化,进一步提高多播系统的传输速率.仿真结果表明,与传统多播组内资源分配方案相比,显著提升多播系统的归一化速率.
Aiming at the problem that the transmission rate in wireless multicast system is restricted to the worst channel capacity in multicast group, an intra-group resource allocation algorithm is proposed.Under the premise of different rate requirements among users, Subcarrier allocation and power allocation to maximize the normalized rate of the multicast system.The subcarrier allocation algorithm uses the multiuser diversity between multicast users on each subcarrier to allocate subcarriers to the subcarriers for better performance Of the number of users.Power allocation algorithm using gradient-based power distribution to each subcarrier to allocate power locally optimized to further improve the multicast system transmission rate.The simulation results show that with the traditional multicast group resource allocation scheme Compared to significantly improve the multicast system normalized rate.