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投稿时间：2014-04-07 修订日期：2014-09-13
投稿时间：2014-04-07 修订日期：2014-09-13
中文摘要: 针对OFDMA的无线协作多播系统中，由于信道瞬时衰落的影响，不能保证所有多播数据成功传输的问题,从优化系统频域和功率的资源出发，提出在最小化多播传输中断概率时的联合子载波和功率分配优化算法。在子载波分配阶段采用比例协作子载波分配算法，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,有效地利用了有限的功率。仿真结果表明：提出的协作算法的中断概率明显小于传统非协作算法的中断概率；在协作算法中有功率分配算法的中断概率小于没有功率分配算法的中断概率。提出的资源优化算法能很好地克服信道瞬时衰落的影响，保证多播数据的成功传输。
中文关键词: 多播 协作分集 正交频分多址（OFDMA） 资源优化
Abstract:In OFDMA-based wireless cooperative multicast systems,it is impossible to guarantee successful transmission of every data due to instant deep fading. Hence, in order to solve the problem,resource optimization algorithms form frequency and power resource was exploited.A cooperative joint subcarrier and power allocation scheme that minimizes the probability of multicast transmission failure were proposed.Cooperative proportional (CP) subcarrier allocation strategy and iterative power (IP) allocation strategy were proposed to achieve tradeoff between throughput and fairness,and fully utilize the limited power,respectively.Simulation results showed that system performance of the schemes with cooperation is significantly enhanced compared with that without cooperation and the scheme with IP remarkably outperform that without IP.Therefore,the schemes can overcome the effect of instant deep fading,and guarantee the reliable multicast transmission.
文章编号：201400363 中图分类号： 文献标志码：
基金项目: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)
作者简介:
引用文本：
陈雷,王洪玉.无线协作多播系统中基于中断概率的资源优化算法[J].工程科学与技术,2014,46(6):133-138.
Chen Lei,Wang Hongyu.ResourceOptimizationAlgorithmBasedonOutageProbabilityforWirelessCooperative MulticastSystems[J].Advanced Engineering Sciences,2014,46(6):133-138.
引用文本：
陈雷,王洪玉.无线协作多播系统中基于中断概率的资源优化算法[J].工程科学与技术,2014,46(6):133-138.
Chen Lei,Wang Hongyu.ResourceOptimizationAlgorithmBasedonOutageProbabilityforWirelessCooperative MulticastSystems[J].Advanced Engineering Sciences,2014,46(6):133-138.