CAJ | 학술논문

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。
위해결중계협작통신계통중돌발단정(SBD)신호적검측문제，해문제출일충기우반정정송치(SDR)적신호직접맹회복방법。해방법가재신도상태신식화신호통계량신식결실정황하직접맹회복돌발단정수거서렬。수선급출료단중계협작통신계통중SBD신호맹검측적수학모형；연후추도료고계정교폭도조제(QAM)신호적최소이승고계목표함수，병응용SDR법구해해우화문제，SDR법소득저질해가유효핍근최우해。최후，방진결과표명해방법효과량호병구유쾌속수렴성，소제출적방법위돌발단정신호맹검측제공료일충차감사로。
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.