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Evaluation of System Effectiveness (SE) plays a significant role in network design, construction, optimization, etc. of Wireless Sensor Networks (WSNs). This paper develops a rational and comprehensive five-layer indicator model which incarnates SE or monomial efficiency of WSNs. Also, we propose a valid evaluation model HFCE with Analytic Hierarchy Process (AHP) and Fuzzy Comprehensive Evaluation...
The determination of the optimal fractional Fourier transform (FrFT) order is a crucial issue for FrFT. This paper introduces a novel algorithm is proposed for the estimation of FrFT order. We use the information of pitches, harmonies and formants in the correlogram of Gammatone filterbanks to get a few candidates of the transform order. The proposed method reduces the computation complexity in the...
This article introduces fractional Fourier transform (FrFT) to speech enhancement, A novel algorithm is proposed for the estimation of FrFT order. The determination of the optimal FrFT order is a crucial issue for FrFT. We use the information of pitches, harmonies and formants in correlogram of Gammatone filterbank to get a few candidates of the transform order. The proposed method reduces the computation...
LEACH (Low Energy Adaptive Clustering Hierarchy) is a clustering-based protocol that utilizes randomized rotation of the cluster-heads to evenly distribute the energy load among the sensor nodes in the network. This classical protocol has been widely used in wireless sensor network (WSN). However, it has the disadvantage of irrationality of electing cluster-head and of unbalanced energy consumption...
Wireless sensor networks (WSNs) currently operate in the unlicensed industrial, scientific and medical (ISM) spectrum band. However, more and more wireless equipments make this band overcrowded. The tremendous growth in the applications of WSNs has posed great challenges for the precious radio electromagnetic spectrum resource. The limited wireless spectrum resource will be the bottleneck for the...
Collaborative simulation is proposed as a technique to support design evaluation with higher fidelity by addressing the interacting phenomena during the development of complex system. To facilitate the collaborative simulation, the High Level Architecture (HLA) was proposed and evolved as a standard with its interface specification, object model template (OMT) and rules. HLA provides a common structural...
A kind of performance evaluation for communication network is presented. In our work, a distributed evaluation system via High Level Architecture (HLA) and a novel quantitative evaluation method are proposed to evaluate communication network on-line. During the weight determination process, a combinative method based on the principle of maximum deviation and subjective estimation is proposed to overcome...
Monitoring grain storage situation is playing a very important role in grain storage safety. Traditional monitor system for grain depots has several drawbacks, such as large cable coverage, more interference and lighting strike, high maintenance cost and so on. To deal with these issues, a novel scheme of the monitor system for grain depots is proposed based on wireless sensor network (WSN). This...
This paper presents a kind of survivability evaluation technique for tactical data link network (TDLN). In our work, a distributed evaluation system via high level architecture (HLA) is provided to evaluate the TDLN online, and a novel quantitative evaluation method based on the principle of maximum deviation and subjective estimation is proposed to overcome the weakness of subjectivity from the method...
Adaptive playout algorithms play a very important role in guaranteeing the QoS (Quality of Service) in VoIP (Voice over IP). The prediction of network delay in adaptive playout algorithms is essentially a time series analysis problem. Currently most delay predition methods are based on parameter estimation. However, the strong parameter assumptions in parameter estimation usually could not correspond...
This paper presents a 3.3kbps Characteristic Waveform Interpolation (CWI) speech coding algorithm based on biorthogonal Wavelet Transform (WT). The amplitude spectral surface of characteristic waveforms is decomposed into a series of reduced time resolution surfaces with B-spline biorthogonal wavelet filter banks. This multi-scale characteristic leads to more efficient quantization by exploiting each...
In this paper, a novel algorithm for searching optimal HARQ methods with constellation rearrangement is proposed. This novel method tries to average the combined reliability of demodulated bits after retransmissions. According to this idea, two constellation rearrangement schemes for 64QAM with restricted retransmission times are presented through the proposed search algorithm, which can well equalize...
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