论文部分内容阅读
针对传统的多播策略中,系统吞吐量受限于多播组中最差用户的信道增益的问题,提出一种基于减少反馈策略和联合编码策略下的多播资源分配算法.采用分层编码与里所(RS)码的联合编码策略,进行数据的分层和补偿丢失的数据包.对传输的不同层的数据采用不同的反馈策略来降低上行反馈负载,并且将资源分配问题建模为最优化问题,为了减轻计算复杂度,又提出了次优化的能保证多播组服务质量的比例公平子载波分配算法与注水功率分配算法(WF-Q).为进一步降低复杂度,采用新的增加固定功率的分配算法(IFP-Q).仿真结果表明,提出的反馈策略明显减少了上行反馈负载,并且联合的编码策略能进一步提高系统性能.
Aiming at the problem that the system throughput is limited by the channel gain of the worst user in the multicast group in the traditional multicast strategy, a multicast resource allocation algorithm based on feedback reduction strategy and joint coding strategy is proposed. And joint (RS) code coding strategy, data stratification and compensation for lost data packets on the different layers of data transmission using different feedback strategies to reduce the uplink feedback load, and the resource allocation problem is modeled as In order to reduce the computational complexity, a sub-optimal proportional fair subcarrier allocation algorithm and water injection power allocation algorithm (WF-Q) that can guarantee the QoS of multicast groups are proposed. To further reduce the complexity, a new (IFP-Q) is added.The simulation results show that the proposed feedback strategy significantly reduces the uplink feedback load, and the joint encoding strategy can further improve the system performance.