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Objective To investigate the genetic association of miR-146a gene polymorphisms at loci rs2910164 G/C, rs57095329 A/G, and rs6864584 T/C in patients with Kawasaki disease (KD) and coronary artery lesions (CAL). Methods There were 120 patients with KD and 126 healthy subjects in this study. The genotype of loci rs2910164 G/C, rs57095329 A/G, and rs6864584 T/C of miR-146a gene were detected by polymerase...
A method of channel estimation based on training sequences is proposed for MIMO-OFDM systems. Moreover, the criterion is derived by simplified means for optimum training sequences construction. Based on the criterion, two methods are proposed for construction of optimum training sequences. Computer simulations are conducted to evaluate the channel estimation and optimum training sequences construction...
In this paper, a simple subspace based semi-blind channel estimator is developed for precoded OFDM systems. This channel estimator relies on redundant linear preceding. With this proposed channel estimator, the channel identifiability is guaranteed up to one scalar ambiguity, regardless of the channel zero locations and the underlying signal constellations. The ambiguity can be resolved with the known...
Passive radar utilizes transmissions of opportunity to detect targets and estimate targets parameters. This paper systematically presents key techniques that concern the detection of moving targets in FM broadcast-based passive radar via ambiguity function. It addresses the common problems that exist in passive coherent radar, such as system design, interference cancellation and signal processing...
A novel algorithm for precise measurement of RCF (radar carrier frequency) in colored Gaussian noise is proposed. The algorithm involves FFT, non-linear filtering, digital heterodyning, and decimation, phase-based frequency estimation. The algorithm has a reduced threshold relative to the existing methods and performance close to that of maximum likelihood estimation. In addition, the mean-squared...
An improved frequency estimator (CFI-Kay) is proposed. The estimator improves Kay's algorithm by autocorrelation, FFT and interpolation, digital heterodyne, decimation, linear prediction... The estimator has a significantly reduced threshold relative to the existing methods and mean-squared error (MSE) close to that of maximum likelihood estimation (MLE). In addition, the MSE is within 0.2 dB of the...
MIMO-OFDM is a promising technique for broadband communications over mobile wireless channel. In this paper, we investigate the channel estimation problem for MIMO-OFDM systems. We proposed a novel EM (expectation maximization)-based channel estimation method. This proposed method employs the poly-nomial channel model along with the EM-based algorithm and makes a tradeoff between the computational...
MIMO-OFDM is a promising technique for broadband communications over mobile wireless channel. In this paper, we investigate the channel estimation problem for MIMO-OFDM systems. We proposed an EM-based method to implement channel estimation, in which the polynomial channel model was used. The proposed EM-based method partition the problem of estimating a multi-input channel into independent channel...
A new variable-step-size (VSS) LMS algorithm is proposed, and its performance is analyzed. Simulation results indicate that the performance is superior to that of existing VSS algorithm. The proposed algorithm is then applied to multi-path interference (MPI) cancellation in FM broadcast-based passive radar; experiments shows over 40 dB of MPI can be cancelled and a fast convergence rate as well as...
An improved estimator (CFI-Kay) for radar carrier frequency is proposed The estimator is a combination of autocorrelation, FFT and interpolation, digital heterodyne, decimation, linear prediction.'The estimator has a significantly reduced threshold relative to the existing methods and mean- squared error (MSE) close to that of maximum likelihood estimation (MLE). In addition, the MSE is within 0.2...
In passive radar based on illuminators of opportunity, one of the key problems is the suppression of the direct path interference (DPI) from the illuminator. This paper analyzes the DPI and the effect of which on passive radar in practical application, and demonstrates the importance of the suppression of DPI prior to analog to digital converter (ADC), Based on which, a new, efficient, automatic cancellation...
In passive radar based on illuminators of opportunity, one of the key problems is the suppression of the direct path interference (DPI) from the illuminator. This paper analyzes the DPI and the effect of which on passive radar in practical application, and demonstrates the importance of the suppression of DPI prior to analog to digital converter (ADC). Based on which, a new, efficient, automatic cancellation...
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