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In this paper, a particle swarm optimization (PSO) based audio watermarking scheme is proposed. The watermark is embedded by modifying singular values of the host audio signal with the spread spectrum method. The designed optimization technique employs PSO to search for optimal watermark strength by keeping adapting the fitness values so that the conflicting requirements of robustness and imperceptibility...
In this paper, we propose a fast intra mode decision for high efficiency video coding (HEVC) to reduce its encoding complexity. It proposes an early termination method under its hierarchical structure that uses the intra prediction mode (IPM) of corresponding previous-depth prediction unit (PU) and block size of current-depth transform unit (TU). To reduce even more complexity, the number of candidates...
Multiple-input-multiple-output (MIMO) radar with collocated antennas transmits orthogonal waveforms to allow the received echoes to be used efficiently for range and Doppler estimation. The orthogonality of the transmitted waveforms should hold for both time shifts and frequency shifts. This paper, for the first time, extends two time-frequency hopping coding methods — the Costas Array Coding (CAC)...
This paper extends the neural network based algorithm to the equiripple design of FIR digital differentiators in the weighted least-squares (WLS) sense. The error representation reformulated by the Lyapunov error function reflects the difference between the desired amplitude response and the designed response. The optimal filter coefficients are obtained when the neural network is convergent. Furthermore,...
Semi-supervised clustering uses a small amount of labeled data to aid and bias the clustering of unlabeled data. In this paper the use of labeled data at the initial state, as well as the use of the constraints generated from the labels during the clustering process is explored. We formulate the clustering process as a constrained optimization problem, and propose a novel semi-supervised fuzzy co-clustering...
This paper presents a novel mechanism based on the histograms of packet filtering, which are able to effectively monitor firewall performance in real-time and to predict the patterns of packet filtering in terms of rules order and rule-fields order. Furthermore, the mechanism becomes even more significant when firewall is heavily loaded with burst traffic. A comparison of the proposed approach and...
In this paper we address the problem of two-way communication in multiple peer-to-peer relay networks, with perfectly known channel state information. Herein, multiple terminal transceiver nodes in the network are organized into two groups, and transceivers in each group want to simultaneously conduct bidirectional communications with their respective peers in the other group through the assistance...
Recent advance in integrated circuit design enables the steady development of wireless sensor networks (WSNs) and fast microprocessors are being equipped on senor nodes. Consequently, computational capacity of a sensor node increases, and it allows for the adoption of sophisticated optimization algorithms. This motivates us to investigate the applicability of model predictive control (MPC) in the...
The third generation partnership project (3GPP) long term evolution (LTE) radio standard has adopted a special form of orthogonal frequency division multiplexing (OFDM) method for the uplink of multiple access networks. This method which is called single carrier frequency division multiple access (SC-FDMA) applies a precoding to each user data set in each OFDM symbol to control its peak-to-average...
In this paper, a new method is proposed to optimize the projection matrix, which, unlike the existing approaches, attempts to choose the projection matrix such that the sensing matrix is as close to a tight frame/equiangular tight frame as possible. In the proposed method, there are two important procedures that are used to adjust the Gram matrix of the sensing matrix. The simulation results are presented...
In this paper, an improved image contrast enhancement algorithm extending the existing contrast-tone mapping framework is proposed. The proposed method improves the existing algorithm with new definition of image contrast and novel constraints to the optimization. Experimental results demonstrate that the proposed Improved Optimal Contrast-tone Mapping (IOCTM) algorithm outperforms existing histogram...
Filter banks facilitate an estimation of the power spectral density of broad-band non-stationary signals, an operation required in many cognitive radio systems. The samples at the filter bank output may serve as a basis for an estimation of the input signal energy within any time-frequency (TF) region of interest. In order to achieve a high resolution in both time and frequency, the prototype window...
In a typical processing chain of an image enhancement, an exposure fusion scheme can be used which usually includes smoothing effect which allows prevention of occurrence of seams in the final image. But such step usually comes with a price of losing fine details thereby blurring the final image, which then makes the scheme unable to preserve fine details as good as high dynamic range (HDR) imaging...
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