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Optimal antenna configuration for non‐cophase equal gain combining diversity using genetic algorithm
Author(s) -
Ngamjaroen Tagsak,
Uthansakul Peerapong,
Uthansakul Monthippa
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25502
Subject(s) - diversity gain , antenna (radio) , maximal ratio combining , realization (probability) , genetic algorithm , fitness function , electronic engineering , algorithm , antenna diversity , signal to noise ratio (imaging) , dimension (graph theory) , constraint (computer aided design) , computer science , wireless , diversity combining , engineering , mathematics , mathematical optimization , telecommunications , fading , statistics , mechanical engineering , decoding methods , pure mathematics
The equal gain combining (EGC) diversity technique is generally known to have a performance close to an optimal maximal ratio combining technique while being less complex for realization.Therefore, the implementation of EGC in practice is of interest. However, the implementation of EGC diversity is cumbersome due to additional circuitry required for making a cophase signal in each branch. As a result, it is interesting to investigate whether non‐cophase EGC diversity is able to provide an acceptable performance while keeping much greater simplicity with only marginally inferior when compared with cophase method. As there is dimension constraint on wireless terminal, the problem of how to configure multiple antennas on such a limited area is of interest. This article studies the performance of non‐cophase EGC diversity through the problem antenna configuration. The genetic algorithm (GA) technique is applied to achieve an optimal solution using the average signal‐to‐noise ratio as a fitness function. The proof of proposed method has been confirmed through simulation as well as measurement results. The investigations reveal that the antenna configuration by using optimization technique provides the best performance on limited space for non‐cophase EGC diversity. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2462–2467, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25502