基于特征空间的线性约束最小方差波束形成器
Eigenspace-Based Linearly Constrained Minimum Variance Beamformer
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摘要: 该文把线性约束和特征空间技术相结合,提出了基于特征空间的线性约束最小方差波束形成器(ELCMVB),该波束形成器是把线性约束最小方差波束形成器(LCMVB)的预定约束方向导向矢量向信号子空间投影,再结合线性约束用LCMVB来得到权矢量。经分析表明,ELCMVB的性能优于GEIB的性能。与GEIB相比,ELCMVB不用计算修改的信号子空间,避免了因计算修改信号子空间而容易造成的计算不稳定性,且其波束形成性能基本上不受零点约束位置的影响。最后,给出了计算机仿真结果,并证实了ELCMVB的优越性。Abstract: By combining the Linearly Constrained Minimum Variance Beamformer(LCMVB) with the eigenspace-based beam former, this pnper presents the Eigenspace-based Linearly Constrained Minimum Variance Beamformer{ELCMVB). The ELCMVB first projects the presumed steering vector of the LCMVB onto the signal subspace, then gets the weight vector by using the LCMV and the projected steering vector. The theoretical analysis indicates that the ELCMVB outperforms the Generalized Eigenspace-based Beamlbrmer(GEIB).Compared to the GEIB, the ELCMVB removes the computation of the modified signal subspace and overcomes the numerical instability. Null constraints hardly affect the performance of the ELCMVB. Computer simulation results are also presented and demonstrate the merits of the ELCMVB.
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