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This paper presents an enhanced phase-locked loop (PLL) based on the second-order generalized integrator (SOGI) for tracking and restructuring alternating current (AC) signals with unknown amplitude, DC offsets, frequency, phase angle and phase sequence. According to the second-order generalized integrator configured as a quadrature signal generator (SOGI-QSG), amplitudes, DC offsets and the phase...
In the current Internet environment, security incidents occur frequently and the potential safety problems are highlighted. In this case, we propose "Internet trusted identity authentication system". The system changes the previous conventional mode of identity authentication, changes the mode of username/password to the relationship bound between net ID and password rule and replaces the...
To solve the problem that the ant colony algorithm is easy to fall into local optimal solutions in solving the shortest path problem, improvements on the classical ant colony algorithm are provided in three aspects. Firstly, direction guiding is utilized in the initial pheromone concentration to speed up the initial convergence; secondly, the idea of pheromone redistribution is added to the pheromone...
Providing adequate and reliable spectrum resources for unlicensed users in spectrum database-based cognitive radio networks is very challenging, mainly due to the dynamic resource availability induced by the licensed users' activities and radio environment. In this paper, we propose an adaptive spectrum access method based on spectrum database for cognitive radio (CR) networks. While making decision...
This paper presents a novel tag identification mechanism called the Collision Inversion (CI) method, that identifies the transmission tag IDs by their collided bits. Based on the CI method, anti-collision protocols coined the Pure Collision Inversion Protocol (PCIP) and the Segment Collision Inversion Protocol (SCIP) are proposed. Theoretical analysis shows that the identification efficiency of PCIP...
Many real world optimization problems are dynamic optimization problems (DOPs) whose optima change over time. In this paper, we propose new variants of differential evolution (DE) to solve DOPs. A hybrid method that combines population core based multi-population strategy and prediction strategy and new local search scheme is introduced into DE to enhance its performance for solving DOPs. The population...
Multi-sensor was needed while using data fusion technique in wireless sensor networks. A data fusion algorithm of single sensor was proposed in the paper. With recursive least square method in the algorithm, the dynamic model of sensor was built up, and the achievement of data fusion between sensor's measure value and estimate value increased the measure precision. Simulation results show that the...
The Query-by-Humming (QBH) system allows users to retrieve songs by singing/humming. In this paper we propose a phrase-level piecewise linear scaling algorithm for melody match. Musical phrase boundaries are predicted for the query to split it to phrases. The boundaries of melody fragment corresponding to each phrase are allowed for adjusting in a limited scope. The algorithm employs Dynamic Programming...
To achieve a good balance between matching accuracy and computation efficiency is a key challenge for query-by-humming (QBH) system. In this paper, we propose an approach of n-gram based fast match. Our n-gram method uses a robust statistical note transcription as well as error compensation method based on the analysis of frequent transcription errors. The effectiveness of our approach has been evaluated...
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