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In LTE-A (Long Term Evolution-Advanced) network deployed with higher order MIMO (Multiple Input Multiple Output), CRS (Common Reference Signal) is substituted by CSI-RS (Channel State Information Reference Signal) aiming for detecting channel more efficiently. But LTE (Long Term Evolution) legacy UEs (User Equipment) cannot distinguish CSI-RS from data which may deteriorate the LTE UEs' demodulation...
Bat algorithm is a novel swarm intelligent algorithm inspired by the echolocation behavior of bats. However, the exploitation capability is not well for some multi-model problems. In this paper, a new parameter, inertia weight is introduced to improve the local search capability. In this new variant, the inertia weight is used to control the influence of the inertia of previous velocity for each bat...
In this paper, we discuss the consensus of discrete-time multi-agent system. Based on the network topology, consensus protocol in discrete-time with dynamic step-size is designed. Conventional algorithms need man made step-size generally, having a great non-natural impact. The new algorithm employs a self-adaptive dynamic step-size based on the network topology, with little non-natural factor, and...
This paper presents an image processing technique to assist hypochromatopsia people with better viewing experience. We propose an image enhancement approach, called color reprint, based on a linear transformation with color space calculation to adjust the color presentation. By rearranging the color gamut, our method can help hypochromatopsia people distinguish the difference among the colors they...
This paper introduces a novel heuristic search and optimization algorithm in order to find the maximum/minimum values of mathematical functions, by mimicking a certain community behavior seen in human beings. The intense search procedure in selected search areas followed by soldiers/policemen while capturing convicts/terrorists is followed here. Initial results obtained for some benchmark functions...
Intermittently Connected Mobile Networks (ICMNs) are sparse wireless networks where most of the time an end-to-end path does not exist from source to destination. These networks are characterized by opportunistic connectivity, long and variable delay, asymmetric data rate and high error rate. Hence, they can be appropriately modeled as Delay-Tolerant Networks (DTNs). In this paper, the performance...
The object tracking by using single feature is possible to generate errors and easy to lose the target if the illumination and object size scale are changed. We propose a particle-filter-object-tracking algorithm. The proposed algorithm is based on a covariance region descriptor (CRD). The CRD can fuse different features of a targeted object region while handling various complex backgrounds. Hence,...
Consider two remote nodes having binary sequences $X$ and $Y$ , respectively. $Y$ is an edited version of ${X}$ , where the editing involves random deletions, insertions, and substitutions, possibly in bursts. The goal is for the node with $Y$ to reconstruct $X$ with minimal exchange of information over a noiseless link. The communication is measured in terms of both the total number of...
This paper proposed a novel algorithm to analyze the evolution of regional collaborative innovation systems from the complex network perspective. At first, we illustrate the structure of collaborative networks, which contains several elements. And we found out the system could be regarded as a complex network. As to the evolution algorithm we proposed, in order to match the actual situation, each...
This paper proposes an RFID benchmark and simulator in order to evaluate anti-collision algorithms. The proposed suite was specially developed to the MAC layer evaluation since to our knowledge there is no standard on RFID anti-collision simulator software. Although some simulators for RFID networks have been proposed, none of them are designed to the MAC layer performance evaluation. This paper,...
Dynamic nature of distributed architecture is a major challenge to avail the benefits of distributed computing. An effective solution to deal with this dynamic nature is to implement a self-adaptive mechanism to sustain the distributed architecture. Self-adaptive systems can autonomously modify their behavior at run-time in response to changes in their environment. This capability may be included...
In this paper, a new two-dimensional (2D) Tent cascade-Logistic map (2D-TCLM) is introduced. Analysis results demonstrate that it has complex chaotic behaviors. Using 2DTCLM, a new image encryption algorithm is also proposed. Simulation results and security analysis show that it can encrypt different kinds of digital images into unrecognized random-like images with a high security level.
Orthogonal frequency division multiple access (OFDMA) has been widely used for multiple access in broadband wireless network. However, a major drawback of OFDMA signals is the high peak-to-average power ratio (PAPR). Tone reservation (TR) is a well known method using reserved subcarriers to design a peak-cancelling signal for lower PAPR of transmit OFDMA signals. In this paper, we propose an improved...
In this paper, the improved operation algorithm for parallel 3-phase PWM converter for renewable energy systems is proposed. The proposed algorithm has a higher performance at the light load condition to use 2-phase operation mode on same load conditions with parallel 3-phase PWM converter. To verify the performance of algorithm, theoretical analysis of efficiency is progressed for obtaining the efficient...
Sphere Decoding (SD) algorithm was proposed to effectively find the Maximum Likelihood (ML) solution. However, the computational complexity of SD is still too high when SNR is low or the dimension of the problem is large. In this paper, we propose three improved schemes based on contraction factor to reduce the complexity of sphere decoding. In the proposed schemes, a factor was introduced for speeding...
Energy efficiency is an active research area in WSNs technology. There is an extensive research work going towards this direction and existing mechanisms fail to address the problem completely due to its limited specificity. This work focuses on the idea of enhancing the network lifetime on the basis of cluster-heads (CHs) remaining energy levels. Thus, instead of changing CHs at every round for dynamic...
Aiming at classic Mean Shift based on tracking algorithm can not track target when the speed changed, the paper proposed an improved algorithm based on corrected background weighted histogram(CBWH), the algorithm used two iterations on target, first time used mean shift to iterate and calculated the similarity coefficient, second iteration used twice the current frame center minus the previous frame...
In order to solve the problem of poor localization accuracy of DV-Hop algorithm, an improved DV-Hop algorithm is proposed in this paper. The proposed algorithm is based on RSSI technology to modify the hop count between nodes. The concept of basic signal strength of node which will be used to modify hop count is proposed in this paper. The hop coefficient and hopsize coefficient are set up to modify...
For the low accuracy of the spectrum sensing of the single node, this paper discusses several popular cooperative spectrum sensing technology. It also proposes a clustering double threshold cooperative spectrum sensing algorithm does two threshold detection based on the double threshold cooperative spectrum sensing algorithm. This algorithm applies or data fusion rule to realize the combination of...
We study theoretical and practical aspects of five of the most well-known self-stabilizing dining philosophers algorithms. We theoretically prove that three of them are incorrect. For practical evaluation, we simulate all algorithms and evaluate their fault-tolerance, latency and throughput of critical section access. We present a new combined algorithm that achieves the best throughput of the two...
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