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MIMO干扰信道下低复杂度的分布式干扰对齐算法 被引量:3
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作者 朱政宇 王忠勇 +2 位作者 高向川 段琳琳 王行业 《信号处理》 CSCD 北大核心 2013年第3期400-404,共5页
干扰对齐技术可以有效地提高干扰信道容量和抑制干扰,其问题归结为求得闭式解。传统的干扰对齐方案根据信道的互易性,采用迭代的方法(分布式)来逼近闭式解,但带来了较大的计算开销。本文在K用户MIMO干扰信道系统中提出一种低复杂度的分... 干扰对齐技术可以有效地提高干扰信道容量和抑制干扰,其问题归结为求得闭式解。传统的干扰对齐方案根据信道的互易性,采用迭代的方法(分布式)来逼近闭式解,但带来了较大的计算开销。本文在K用户MIMO干扰信道系统中提出一种低复杂度的分布式干扰对齐算法,通过对用户K的干扰协方差矩阵进行排序QR分解算法,该分解算法是基于修正的Gram-Schmidt方法,选出酉矩阵Q最后的dk列作为用户近似的干扰抑制滤波矩阵,和传统分布式干扰对齐方案相比,在基本保持系统容量和迭代收敛速度的同时,系统的复杂度明显降低。仿真结果验证了算法的有效性。 展开更多
关键词 MIMO干扰信道 分布式 干扰对齐 排序QR分解 修正的Gram—Schmidt方法
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STATIC REGIME IMAGING OF LOCATIONS OF CERTAIN 3D ELECTROMAGNETIC IMPERFECTIONS FROM A BOUNDARY PERTURBATION FORMULA
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作者 Seraphin M. Mefire 《Journal of Computational Mathematics》 SCIE CSCD 2014年第4期412-441,共30页
We are concerned, in a static regime, with a three-dimensional bounded domain of certain an imaging approach of the locations in electromagnetic imperfections. This approach is related to Electrical Impedance Tomograp... We are concerned, in a static regime, with a three-dimensional bounded domain of certain an imaging approach of the locations in electromagnetic imperfections. This approach is related to Electrical Impedance Tomography and makes use of a new perturbation formula in the electric fields. We present two localization procedures, from a Current Pro- jection method that deals with the single imperfection context and an inverse Fourier process that is devoted to multiple imperfections configurations. These procedures extend those that were described in our previous work, since operating for a broader class of settings. Namely, the localization is additionally performed for certain purely electric imperfections, as established from numerical simulations. 展开更多
关键词 Inverse problems Maxwell equations Electric fields INHOMOGENEITIES Elec-trical lmpedanee Tomography Current Projection method FFT Numerical boundarymeasurements Random noise Edge elements Least square systems Incomplete modifiedgram-schmidt preconditioning.
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