摘要
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.
T he resource allocation issues in OFDM A (orthogonal frequency division multiple access )-based wireless cooperative multicast systems were investigated ,in which only allow average channel state information of users was available at the resource manager .As it is impossible to guarantee suc-cessful transmission of every data due to instant deep fading ,in order to achieve efficient and reliable transmission ,potential advantage was exploited provided by the cooperative diversity ,and a coopera-tive joint subcarrier and power allocation scheme were proposed to minimize the probability of multi-cast transmission failure .This combinable allocation issue has high computational complexity ,so the subcarrier and power were allocated separately .Cooperative proportional (CP) subcarrier allocation strategy was proposed to achieve tradeoff between throughput and fairness and iterative power (IP) allocation strategy was proposed to fully utilize the limited power .Simulation results show that sys-tem performance of the schemes with cooperation is significantly enhanced compared with that without cooperation and the schemes with IP remarkably outperform that without IP .
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第11期63-67,73,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(61172058)
高等学校博士学科点专项科研基金资助项目(20120041110011)
关键词
多播
协作分集
正交频分多址
资源分配
平均信道信息
次优化
multicast
cooperative diversity
OFDMA
resource allocation
average channel state information
suboptimization
