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The problem of joint frequency and direction of arrival (DOA) estimation for multiple narrowband signals is addressed here. Previous work has employed co-prime arrays and co-prime samplers to estimate the frequency and DOA individually. Though this can increase the degrees of freedom (DOFs) in the space or time domain, the drawback lies in that it requires an extra procedure to pair these two kinds...
In this paper, a new beamformer with improved robustness against the small sample size is proposed. This beamformer first employs the modified sparse Bayesian learning (SBL) algorithm to obtain an accurate estimate of the covariance matrix. To further improve the robustness, subspace projection is implemented subsequently. In addition, due to the inherent decorrelation capability of the SBL algorithm,...
Error vector magnitude (EVM) is extensively applied as a measure of wireless communication systems' performance. In this paper, the effects of amplitude and phase errors for satellite digital beam-forming (DBF) multi-beam phased array antenna systems on EVM are investigated. The analytic expression for EVM about array channels' amplitude and phase errors is derived and verified by computer simulation.
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