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研究了基于正交频分多址(OFDMA)无线协作多播系统的资源分配问题,该系统的资源分配中只有用户的平均信道状态信息可用.由于瞬时深衰落的影响,不可能保证每一个多播数据的成功传输,因此为了达到有效可靠的传输,利用协作分集带来的潜在增益,提出了协作的联合子载波和功率分配算法来最小化多播传输的中断概率.由于联合分配问题有很高的计算复杂度,因此提出了次优化的分配算法.在子载波分配阶段提出了比例协作子载波分配算法(CP)来实现吞吐量和公平性的折中.在功率分配阶段采用迭代功率分配算法(IP)来有效地利用有限的功率.仿真结果表明所提出的协作算法的性能明显优于传统的非协作算法.
The problem of resource allocation based on Orthogonal Frequency Division Multiple Access (OFDMA) wireless cooperative multicast system is studied, in which only the average channel state information of users is available for resource allocation, and it is impossible to ensure that each one is more due to the effect of instantaneous deep fading Therefore, in order to achieve effective and reliable transmission, the cooperative subcarriers and power allocation algorithms are proposed to minimize the interruption probability of multicast transmission by utilizing the potential gain brought by cooperative diversity.Because of the problem of joint allocation High computational complexity, a sub-optimal allocation algorithm is proposed.The Proportional Coordinated Subcarrier Allocation (CP) algorithm is proposed in the subcarrier allocation stage to achieve a compromise between throughput and fairness.It uses iterative power allocation in the power allocation phase Algorithm (IP) to effectively utilize the limited power.The simulation results show that the performance of the proposed cooperative algorithm is significantly better than the traditional non-cooperative algorithm.