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Search Symbol (Half-width) Description of Search Symbols
Space "AND" indicates the intertwining of key terms used in a search
Double Quotation Marks ("") ( " " ) Double quotation marks indicate the beginning and end of a phrase, and the search will only include terms that appear in the same order of those within the quotations. Example: "image process" : " image process "
? Indicates a variable letter. Entering two ? will indicate two variable letters, and so on. Example: "Appl?", search results will yield apple, apply… e , appl y … ( (often used to English word searches) )
* Indicates an unlimited number of variable letters to follow, from 1~n. Example: Enter "appl*", search results will yield apple, apples, apply, applied, application…(often used in English word searches) e , appl es , appl y , appl ied , appl ication … ( (often used to English word searches) )

Boolean logic combinations of key words is a skill used to expand or refine search parameters.
(1) AND (1) AND: Refines search parameters
(2) OR (2) OR: Expands search parameters (3) NOT: Excludes irrelevant parameters


DOI stands for Digital Object Identifier ( D igital O bject I dentifier ) ,
and is the unique identifier for objects on the internet. It can be used to create persistent link and to cite articles.

Using DOI as a persistent link

To create a persistent link, add「」 「 」 before a DOI.
For instance, if the DOI of an article is 10.5297/ser.1201.002 , you can link persistently to the article by entering the following link in your browser: 10.5297/ser.1201.002
The DOI link will always direct you to the most updated article page no matter how the publisher changes the document's position, avoiding errors when engaging in important research.

Cite a document with DOI

When citing references, you should also cite the DOI if the article has one. If your citation guideline does not include DOIs, you may cite the DOI link.

DOIs allow accurate citations, improve academic contents connections, and allow users to gain better experience across different platforms. Currently, there are more than 70 million DOIs registered for academic contents. If you want to understand more about DOI, please visit airiti DOI ) 。

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Reference ( 6 ) 〈TOP〉
  1. [1] C. D Chung, “Differentially amplitude and phase-encoded QAM for the correlated Rayleigh-fading channel with diversity reception.” IEEE Trans. Commun., vol. 45 no.3, pp. 309-321,Mar 1997
  2. [2] W. J. Weber, “Differential encoding for multiple amplitude and phase shift keying systems.” IEEE Trans. Commun., vol. COM-26,, pp385-394, Mar 1978.
  3. [3] Y. C. Chow, A. R. Nix, and J. P. McGeehan, “Analysis of 16-APSK modulation in AWGN and Rayleigh fading channel,” Electron. Lett., vol. 28, pp. 1608–1610, Aug. 1992
  4. [4] M. S. Alouini and M. K. Simon, “Postdetection switched combining-a simple diversity scheme with improved BER performance,” IEEE Trans. Commun., vol. 51, pp. 1591-1602, Sept 2003
  5. [6] Yunxia Chen Tellambura, C, “Distribution functions of selection combiner output in equally correlated Rayleigh, Rician, and Nakagami-m fading channels,” IEEE Trans. Commun., vol. 52, pp. 1591-1602, Nov 2004
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