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In this paper, the problem of estimating the parameters of an FIR system from only the fourth-order cumulants of the noisy system output is considered. The FIR system is driven by a symmetric, independent, and identically distributed (i.i.d) non-Gaussian sequence. We propose a new formula called Weighted Overdetermined C(q, k) (WOC(q, k)) by extending the conventional C(q, k) formula. The optimal selection of the weights in WOC(q, k) is performed by using the Genetic Algorithm (GA) optimization method which minimizes a nonlinear error function based on the fourth-order cumulants alone. Simulations are provided to reveal the effectiveness and the superiority of this novel technique over the C(q, k) and other existing techniques. 相似文献
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基于四阶累积量,分析一种新的优化准则,即定向小峰度(OMK:Oriented Minimum Kurtosis)准则,理论分析表明,该准则函数具有全局最小值且极值点满足解相关条件。由此,通过求解该优化问题,能得到一种新的盲多用户接收方案,然后,利用最速下降法,给出盲多用户检测的自适应算法,仿真结果进一步验证了本文的结论。 相似文献
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海洋环境中的声场定位,是水声学研究领域中的一个经典问题,尤其是用于海区警戒来监听敌方潜艇的近场定位问题.以往的近场定位研究,通常使用线列阵模型,利用常规聚焦波束形成方法进行定位处理,不仅出现了“左右舷模糊”问题,而且对信号定位不甚理想.为此提出基于半圆阵的四阶累积量MUSIC近场聚焦波束形成算法.通过仿真比较了多种聚焦波束形成在近场线列阵和圆阵条件下的定位性能,结果表明,半圆阵成功地解决了直线阵列出现的“左右舷模糊”问题,基于四阶累积量的MUSIC近场聚焦波束形成可以达到更为平滑的背景以及较小的旁瓣级,定位性能明显优于基于MVDR算法的聚焦波束形成高分辨率被动定位方法. 相似文献
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介绍了一种改进的四阶蔡氏电路.首先采用理论分析的方法建立了电路的数学模型,然后分别采用数值和模拟两种方法对改进后的电路进行了仿真,得到了混沌现象,最后采用响应-驱动法实现了改进型电路的混沌同步.结果表明:改进型蔡氏电路产生了较原蔡氏电路更为复杂的混沌现象,更适合用于混沌通讯. 相似文献
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《国际计算机数学杂志》2012,89(12):1537-1548
In this article, we report on the block alternating group explicit (BLAGE) iterative method for solving the block symmetric linear system derived from the fourth-order accurate nine-point discretisation of a two-dimensional elliptic equation in cylindrical polar co-ordinates. The error analysis of the BLAGE method is discussed briefly. The performance of this more accurate BLAGE method is compared with the corresponding block successive over relaxation (BSOR) method by considering two test problems, wherein the significance of the role played by two parameters ω1 and ω2 of the BLAGE method becomes evident in providing both convergence and accuracy of the computed solution. 相似文献
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高阶累积量计算优化的仿真研究 总被引:1,自引:0,他引:1
高阶累积量由于计算量大而未得到广泛的应用,所以对其进行计算优化以及算法的简化能更好的发挥其优越性,根据推导的非平稳随机过程四阶累积量精确递推估计公式,从减少四阶累积量估计的计算量,增强四阶累积量的工程实用性出发,给出了四阶累积量近似递推估计定理.只要四阶累积鼍的更新因子满足定理的条件,就能减少计算量,并且使估计的四阶累积量保持抑制高斯噪声的性能,并且根据四阶累积量的优化给出了五阶累计量的优化和仿真.从时域和频域进行了优化仿真,仿真结果证实了估计的有效性. 相似文献
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In this paper, the problem of direction-of-arrival (DOA) estimation for monostatic multiple-input multiple-output (MIMO) radar with gain-phase errors is addressed, by using a sparse DOA estimation algorithm with fourth-order cumulants (FOC) based error matrix estimation. Useful cumulants are designed and extracted to estimate the gain and the phase errors in the transmit array and the receive array, thus a reliable error matrix is obtained. Then the proposed algorithm reduces the gain-phase error matrix to a low dimensional one. Finally, with the updated gain-phase error matrix, the FOC-based reweighted sparse representation framework is introduced to achieve accurate DOA estimation. Thanks to the fourth-order cumulants based gain-phase error matrix estimation, and the reweighted sparse representation framework, the proposed algorithm performs well for both white and colored Gaussian noises, and provides higher angular resolution and better angle estimation performance than reduced-dimension MUSIC (RD-MUSIC), adaptive sparse representation (adaptive-SR) and ESPRIT-based algorithms. Simulation results verify the effectiveness and advantages of the proposed method. 相似文献
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The fourth-order diffusion systems depict the wave and photon propagation in intense laser beams and play an important role in the phase separation in binary mixture. In this paper, by using orthogonal spline collocation (OSC) method in spatial direction and classical L1 approximation in temporal direction, a fully discrete scheme is established for a class of fourth-order fractional reaction–diffusion equations. For the original unknown and auxiliary variable , the full-discrete unconditional stabilities based on a priori analysis are derived by virtue of properties of OSC. Moreover, the convergence rates in -norm for unknown are strictly investigated. At the same time, the optimal error estimates in -norm for unknown and in -norm for variable , are also derived, respectively. For further verifying the theoretical analysis, some numerical examples are provided. 相似文献
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