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In this paper, a modified CORIDC algorithm for computation of arctangent is presented. Unlike the conventional CORDIC algorithm which has constant number of iterations, the proposed algorithm calculates the nearest predefined angle to the input phase at the beginning of every iteration and then rotates by an optimal angle. As it has variable iterations, the novel rotation strategy provides faster...
In order to solve the extra power consumption caused by reducing complexity in cooperative relay networks, an optimized power allocation algorithm is proposed for the efficient incremental selection hybrid decode-amplify forward (ISHDAF) scheme. In the ISHDAF scheme, the transmission efficiency is improved by optimizing the power allocation, which is constrained by constant total power. And the outage...
Wireless localization plays an important role in the internet of things, such as the wireless sensor network and the smart grid. Therefore this paper investigates the time-sum-of-arrival (TSOA) based localization algorithm, where a two-step weighted least-squares algorithm is analytically derived according to the elliptical geometry. Meanwhile, the comparison between the proposed algorithm and the...
In this paper, we derive the Bayes-Optimal estimator based on approximate message passing (AMP) algorithm in massive multiple-input multiple-output (MIMO) systems, which requires statistical channel state information (CSI). According to the analysis of channel model in beam domain, the covariance matrix is derived for CSI acquisition. With the aid of statistical CSI, the convergence of the proposed...
The large-scale multiple-input multiple-output (MIMO) system achieves high spectral efficiency, and its performance is ultimately limited by pilot contamination. Since the channel energy usually concentrates in a significant angle region, some mean-square-error (MSE)-based schedule methods have been proposed to mitigate the contamination, but these methods cannot guarantee the quality of service (QoS)...
The allocating and scheduling of tasks in parallel and distributed systems has been considered to be an NP-Complete problem, which has received much attention. Although plentiful algorithms have been developed to obtain suboptimal solutions, many of them didn't consider the total execution time and load balancing among processors simultaneously. To solve this problem efficiently, this paper presents...
The conventional direction finding method is to digitize the output of each sensor at the Nyquist sampling rate for the system bandwidth and use digital signal processing algorithms such as multiple signals classification (MUSIC) or maximum likelihood estimation (MLE) etc. In this paper, we exploit recent developments in compressed sensing (CS) to efficiently perform the direction finding. If the...
This paper presents a new codeword selection criterion based on the Euclidean distance in the limited feedback unitary precoding systems. Because of the non-uniqueness of singular value decomposition (SVD), various precoding matrices may result in the same performance. We take the rotation and permutation invariance property into the definition of distortion function, then bring forward a new codeword...
This paper studied the application of pattern analysis on steganalysis for binary text images, and proposed a novel steganalysis algorithm based on pattern analysis. The idea of image "pattern" was proposed originally through deep investigating all kinds of information hiding and steganalysis algorithms. Firstly the patterns were divided into three categories according to human visual effect...
Based on the application of DCT (discrete cosine transform) in the image compression, the feasibility of DCT to be used in image feature dimension reduction is analyzed, and the basic principle of the image feature dimension reduction based on DCT is given in this paper. And then, taking the face recognition and the facial expression recognition as the research background, the theoretical analysis...
This paper deals with the actuator fault diagnosis and accommodation problem for the aero space vehicle (ASV). A novel nonlinear robust adaptive observer is developed for estimation of the actuator fault under the Lipschitz condition on the nonlinear part of such systems, which is used to continuously accommodate the control signal, so as to ensure the stability of faulty system. Finally, simulation...
Random noise is inevitable in Raman spectral analysis. It has a negative influence on the accuracy of analysis and detection limit. There are many disadvantages for the present methods of wavelet filtering to spectral signals. We achieved separation noise from signal by using Mexican Hat wavelet filtering combined with the averaging algorithm. This method can be used in both low frequency and high...
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