Zai Yang

  1. Unified framework and algorithm for quantized compressed sensing.

    Authors: Zai Yang, Lihua Xie, Cishen Zhang
    Subjects: Information Theory
    Abstract

    Compressed sensing (CS) studies the recovery of high dimensional signals from
    their low dimensional linear measurements under a sparsity prior. This paper is
    focused on the CS problem with quantized measurements. There have been research
    results dealing with different scenarios including a single/multiple bits per
    measurement, noiseless/noisy environment, and an unsaturated/saturated
    quantizer. While the existing methods are only for one or more specific cases,
    this paper presents a framework to unify all the above mentioned scenarios of
    the quantized CS problem.

  2. On Phase Transition of Compressed Sensing in the Complex Domain.

    Authors: Zai Yang, Lihua Xie, Cishen Zhang
    Subjects: Information Theory
    Abstract

    The phase transition is a performance measure of the sparsity-undersampling
    tradeoff in compressed sensing (CS). This letter reports, for the first time,
    the existence of an exact phase transition for the $\ell_1$ minimization
    approach to the complex valued CS problem. This discovery is not only a
    complementary result to the known phase transition of the real valued CS but
    also shows considerable superiority of the phase transition of complex valued
    CS over that of the real valued CS.

  3. Off-grid Direction of Arrival Estimation Using Sparse Bayesian Inference.

    Authors: Zai Yang, Lihua Xie, Cishen Zhang
    Subjects: Applications
    Abstract

    This paper is focused on solving the narrowband direction of arrival
    estimation problem from a sparse signal reconstruction perspective. Existing
    sparsity-based methods have shown advantages over conventional ones but exhibit
    limitations in practical situations where the true directions are not in the
    sampling grid. A so-called off-grid model is broached to reduce the modeling
    error caused by the off-grid directions.

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