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A HYBRID OPTIMIZATION METHOD BASED ON DIFFERENTIAL EVOLUTION AND HARMONY SEARCH. INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE AND APPLICATIONS 2014. [DOI: 10.1142/s1469026814500011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The differential evolution (DE) and harmony search (HS) are two well-known nature-inspired computing techniques. Both of them can be applied to effectively cope with nonlinear optimization problems. In this paper, we propose and study a new DE method, DE–HS, by utilizing the fresh individual generation mechanism of the HS. The HS-based approach can enhance the local search capability of the original DE. Optimization of some unconstrained and constrained benchmark problems and a real-world wind generator demonstrate that our DE–HS has an improved convergence property.
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FUZZY POWER COMMAND ENHANCEMENT IN MOBILE COMMUNICATIONS SYSTEMS. INTERNATIONAL JOURNAL OF COMPUTATIONAL INTELLIGENCE AND APPLICATIONS 2001. [DOI: 10.1142/s1469026801000147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this paper, we propose a fuzzy logic-based power command enhancement scheme for the mobile station in the cellular communications systems. By defining necessary linguistic terms of the power commands and corresponding fuzzy inference rules, an Embedded Fuzzy Unit (EFU) is constructed. The role of our EFU is to produce appropriate digital power commands instead of the one-bit discrete commands directly obtained from the base station. Simulations show that the EFU-based mobile station can generate considerably smoother received power at the base station. The transient overshoot and steady channel tracking error are small. Moreover, our method has the advantage of simplicity in both structure and algorithm, and is thus easy for hardware implementation.
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