基于特征空間的相干干擾抑制技術(shù)
coherent interference suppression with eigenspace-based beamformer
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摘要: 該文把多線性約束和特征空間技術(shù)相結(jié)合,提出了基于特征空間的多約束最小方差波束形成器(EM-CMVB),該波束形成器可以有效抑制相干干擾。EMCMVB是利用估計(jì)得到的相干干擾方向和陣列信號(hào)相關(guān)矩陣特征分解來得到修改的信號(hào)子空間,再把多約束最小方差波束形成器(MCMVB)的權(quán)矢量向修改的信號(hào)子空間投影來得出新的權(quán)矢量。經(jīng)分析表明,EMCMVB的性能優(yōu)于MCMVB的性能。最后,給出了計(jì)算機(jī)仿真結(jié)果,證實(shí)了EMCMVB的優(yōu)越性。
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關(guān)鍵詞:
- 自適應(yīng)波束形成; 陣列信號(hào); 特征空間; 相干干擾
Abstract: The eigenspace-based multiple constrained minimum variance beamformer (EMCMVB) is presented here, which combines the multiple constrained minimum variance beamformer (MCMBV) with the eigenspace-based beamformer. Coherent interference can be suppressed by the EMCMVB efficiently. The EMCMVB first gets the modified signal subspace by using the estimated arrival angles of coherent interferers and the eigenstructure of the correlation matrix, and then projects the MCMVB weight vector onto the modified signal subspace. The theoretical analysis indicates that the EMCMVB outperforms the MCMVB. Computer simulation results are also presented and demonstrate the merits of the EMCMVB. -
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