17 research outputs found
Dictionary Learning for Blind One Bit Compressed Sensing
This letter proposes a dictionary learning algorithm for blind one bit
compressed sensing. In the blind one bit compressed sensing framework, the
original signal to be reconstructed from one bit linear random measurements is
sparse in an unknown domain. In this context, the multiplication of measurement
matrix \Ab and sparse domain matrix , \ie \Db=\Ab\Phi, should be
learned. Hence, we use dictionary learning to train this matrix. Towards that
end, an appropriate continuous convex cost function is suggested for one bit
compressed sensing and a simple steepest-descent method is exploited to learn
the rows of the matrix \Db. Experimental results show the effectiveness of
the proposed algorithm against the case of no dictionary learning, specially
with increasing the number of training signals and the number of sign
measurements.Comment: 5 pages, 3 figure
Bayesian Hypothesis Testing for Block Sparse Signal Recovery
This letter presents a novel Block Bayesian Hypothesis Testing Algorithm
(Block-BHTA) for reconstructing block sparse signals with unknown block
structures. The Block-BHTA comprises the detection and recovery of the
supports, and the estimation of the amplitudes of the block sparse signal. The
support detection and recovery is performed using a Bayesian hypothesis
testing. Then, based on the detected and reconstructed supports, the nonzero
amplitudes are estimated by linear MMSE. The effectiveness of Block-BHTA is
demonstrated by numerical experiments.Comment: 5 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1412.231
Proportionate Adaptive Graph Signal Recovery
This paper generalizes the proportionate-type adaptive algorithm to the graph
signal processing and proposes two proportionate-type adaptive graph signal
recovery algorithms. The gain matrix of the proportionate algorithm leads to
faster convergence than least mean squares (LMS) algorithm. In this paper, the
gain matrix is obtained in a closed-form by minimizing the gradient of the
mean-square deviation (GMSD). The first algorithm is the Proportionate-type
Graph LMS (Pt-GLMS) algorithm which simply uses a gain matrix in the recursion
process of the LMS algorithm and accelerates the convergence of the Pt-GLMS
algorithm compared to the LMS algorithm. The second algorithm is the
Proportionate-type Graph Extended LMS (Pt-GELMS) algorithm, which uses the
previous signal vectors alongside the signal of the current iteration. The
Pt-GELMS algorithm utilizes two gain matrices to control the effect of the
signal of the previous iterations. The stability analyses of the algorithms are
also provided. Simulation results demonstrate the efficacy of the two proposed
proportionate-type LMS algorithms
Block-sparse impulsive noise reduction in OFDM systems - a novel iterative bayesian approach
Using a novel block iterative Bayesian algorithm (Block-IBA), this paper presents a new impulsive noise reduction method for OFDM systems. The method utilizes the guard band null subcarriers and data subcarriers for the impulsive noise estimation and cancellation. Unlike some other general OFDM transceivers which use time-domain interleaving (TDI) to cancel impulsive noise, we design a specific receiver for bursty impulsive noise channels that removes the delay due to TDI and saves memory space. The Block-IBA first estimates the variance and the transition matrix of Markov chain model for the impulsive noise. It then iteratively estimates the amplitudes and positions of the block-sparse impulsive noise using the steepest-ascent based expectation-maximization (EM), and optimally selects the nonzero elements of the block-sparse impulsive noise by adaptive thresholding. Numerical experiments show that the proposed receiver outperforms existing receivers under the block-sparse impulsive noise environment