In this paper, a modified version of the Classical Lagrange Multiplier method is developed for convex quadratic optimization problems. The method, which is evolved from the first order derivative test for optimality o...In this paper, a modified version of the Classical Lagrange Multiplier method is developed for convex quadratic optimization problems. The method, which is evolved from the first order derivative test for optimality of the Lagrangian function with respect to the primary variables of the problem, decomposes the solution process into two independent ones, in which the primary variables are solved for independently, and then the secondary variables, which are the Lagrange multipliers, are solved for, afterward. This is an innovation that leads to solving independently two simpler systems of equations involving the primary variables only, on one hand, and the secondary ones on the other. Solutions obtained for small sized problems (as preliminary test of the method) demonstrate that the new method is generally effective in producing the required solutions.展开更多
协作通信技术可以有效获取空间分集,并进一步改善系统的性能。为最小化多中继解码转发(decode-and-forward,DF)协作通信系统的总功率,同时满足系统要求的数据传输速率,提出了一种基于Lagrange算法的中继选择和功率分配的联合优化方案。...协作通信技术可以有效获取空间分集,并进一步改善系统的性能。为最小化多中继解码转发(decode-and-forward,DF)协作通信系统的总功率,同时满足系统要求的数据传输速率,提出了一种基于Lagrange算法的中继选择和功率分配的联合优化方案。首先根据信源与中继的瞬时信道状态信息(channel state information,CSI)使信源的发送功率最小化,然后选择出最大的可解码中继集合,再利用Lagrange算法对中继功率进行优化,根据得到的信源和中继的功率分配,选择出最佳中继集合,达到最小化系统总功率的目的。仿真结果表明,相对于直传方案和机会中继(opportunistic relay selection,ORS)方案,本研究中总功率消耗明显减少。展开更多
针对LMS(Least Mean Square)阵列信号波束成形器延时精度低和结构复杂的缺点,提出了一种基于Lagrange插值的非整数延时滤波器算法。其本质是采用频域近似的原则,设计出一种小数延时滤波器,可以将数字信号直接延时小数倍采样周期,在精确...针对LMS(Least Mean Square)阵列信号波束成形器延时精度低和结构复杂的缺点,提出了一种基于Lagrange插值的非整数延时滤波器算法。其本质是采用频域近似的原则,设计出一种小数延时滤波器,可以将数字信号直接延时小数倍采样周期,在精确延时专题中具有广泛用途。仿真实验表明,该滤波器可满足阵列信号波束成形中的各种延时精度要求。展开更多
文摘In this paper, a modified version of the Classical Lagrange Multiplier method is developed for convex quadratic optimization problems. The method, which is evolved from the first order derivative test for optimality of the Lagrangian function with respect to the primary variables of the problem, decomposes the solution process into two independent ones, in which the primary variables are solved for independently, and then the secondary variables, which are the Lagrange multipliers, are solved for, afterward. This is an innovation that leads to solving independently two simpler systems of equations involving the primary variables only, on one hand, and the secondary ones on the other. Solutions obtained for small sized problems (as preliminary test of the method) demonstrate that the new method is generally effective in producing the required solutions.
文摘协作通信技术可以有效获取空间分集,并进一步改善系统的性能。为最小化多中继解码转发(decode-and-forward,DF)协作通信系统的总功率,同时满足系统要求的数据传输速率,提出了一种基于Lagrange算法的中继选择和功率分配的联合优化方案。首先根据信源与中继的瞬时信道状态信息(channel state information,CSI)使信源的发送功率最小化,然后选择出最大的可解码中继集合,再利用Lagrange算法对中继功率进行优化,根据得到的信源和中继的功率分配,选择出最佳中继集合,达到最小化系统总功率的目的。仿真结果表明,相对于直传方案和机会中继(opportunistic relay selection,ORS)方案,本研究中总功率消耗明显减少。
文摘针对LMS(Least Mean Square)阵列信号波束成形器延时精度低和结构复杂的缺点,提出了一种基于Lagrange插值的非整数延时滤波器算法。其本质是采用频域近似的原则,设计出一种小数延时滤波器,可以将数字信号直接延时小数倍采样周期,在精确延时专题中具有广泛用途。仿真实验表明,该滤波器可满足阵列信号波束成形中的各种延时精度要求。