协作通信中突发短帧信号的直接盲恢复  

Direct Blind Recovery of Short Burst Data Signal in Cooperative Communication Systems

作　　者：李昌[1] 阮秀凯[1] 

机构地区：[1]温州大学物理与电子信息工程学院,温州325035

出　　处：《电子与信息学报》2014年第4期792-796,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61001067;61201426);浙江省重点科技创新团队自主项目(2012R10006-04);浙江省教育厅科研项目(Y201327231)资助课题

摘　　要：为解决中继协作通信系统中突发短帧(SBD)信号的检测问题,该文提出一种基于半正定松驰(SDR)的信号直接盲恢复方法。该方法可在信道状态信息和信号统计量信息缺失情况下直接盲恢复突发短帧数据序列。首先给出了单中继协作通信系统中SBD信号盲检测的数学模型;然后推导了高阶正交幅度调制(QAM)信号的最小二乘估计目标函数,并应用SDR法求解该优化问题,SDR法所得低秩解可有效逼近最优解。最后,仿真结果表明该方法效果良好并具有快速收敛性,所提出的方法为突发短帧信号盲检测提供了一种借鉴思路。A direct blind recovery method based on SemiDefinite Relaxation （SDR） technique is proposed to detect Short Burst Data （SBD） signals in cooperative relay networks. Without channel state information and signal statistics information, SBD sequences can be recovered directly by the proposed method. Firstly, the mathematical model of blind SBD signal detection in cooperative communication systems with one relay is presented. Then, the cost function of least square estimation for high order Quadrature Amplitude Modulation （QAM） signals is formulated. Meantime, SDR technique is introduced to solve the optimization problem, which leads to a low-rank approximate solution toward the optimal one efficiently. Finally, simulation results verify that the proposed method owns good performance and fast convergence rate. Furthermore, all the results imply that the proposed method provides a reference to those cases of SBD signal detection.

关 键 词：协作通信 突发短帧(SBD) 盲恢复 半正定松弛(SDR) 正交幅度调制(QAM) 

分 类 号：TN925[电子电信—通信与信息系统]