1,721,023 research outputs found
A Cooperative Scheme using Iterative Decoding with BCM-Improved Inter-user Links
No full text合作通訊已經被提出來對抗衰減通道造成的影響，在合作通訊中，每個使用在合作的過程中不僅傳送自己的資訊,也傳送其他使用者的資訊。為了高頻寬效率，我們提出一個使用 M ary 的區塊編碼調變的合作方式。一個使用者的編碼器將自己的資訊框和其他使用者的資訊框裡用區塊編調變的方式結合在一起。藉著適當的延遲操作，每個使用者可以更正確的解碼其他使用者的資訊。在接收端，我們使用遞迴式的解碼。在解碼過程中，上一刻封包解碼出的事後機率將會被用來當作此時封包的事前機率。分析與模擬顯我們所提出的方式會有較好的表現尤其是在糟糕的內部使用者連結的條件之。後，我們將提出的方式應用在另一個實用且有趣的合作方式來達成更有效間與時間上的多樣性。Cooperative communication, in which each user in the cooperative process transmits not only its own information but also information of another user, has been proposed to combat the deleterious effects of fading channels. We present a coded cooperative scheme using M-ary modulation for high bandwidth efficiency. Each user’s encoder combines its own information frame and another user’s information frame by using block coded modulation (BCM). With a proper delay operation, each user could decode another user’s information more correctly. Iterative decoding is used at the destination receiver which means the a posteriori probability of the decoding packet last time is used as the a priori probability for decoding the current packet. The analyses and simulations show that our proposed scheme achieves better performance especially under worse inter-user links condition. At last, we apply the proposed scheme to achieve the spatial-time diversity for another practically interesting cooperative scenario.Contentsbstract iist of Tables viist of Figures v INTRODUCTION 1 THE OVERVIEW OF WIRELESS COOPERATIVE COMMUNI-ATION 4.1 Historical Background . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Cooperative Communication System . . . . . . . . . . . . . . . . . . 6.3 Cooperative Signaling Method . . . . . . . . . . . . . . . . . . . . . . 7 THE PERFORMANCE ANALYSIS OF CONVENTIONAL CODEDOOPERATION 17.1 Pairwise Error Probability Analysis . . . . . . . . . . . . . . . . . . . 17.2 Cooperative Case Probabilities Analysis . . . . . . . . . . . . . . . . 20.3 End-to-End Error Analysis . . . . . . . . . . . . . . . . . . . . . . . . 23 THE PROPOSED SCHEME 26.1 BCM Arrangement 8PSK-based for Inter-user link . . . . . . . . . . . 27.1.1 Encoding Process . . . . . . . . . . . . . . . . . . . . . . . . . 27.1.2 Decoding Process . . . . . . . . . . . . . . . . . . . . . . . . . 30.1.3 Theoretic Coding Gain Analysis and Numerical Result . . . . 33.2 BCM Arrangement 16QAM-based for Inter-user link . . . . . . . . . 42.2.1 Encoding Process . . . . . . . . . . . . . . . . . . . . . . . . . 42.2.2 Decoding Process . . . . . . . . . . . . . . . . . . . . . . . . . 43.2.3 Theoretic Coding Gain Analysis and Numerical Result . . . . 44.3 The Proposed Scheme For Another Scenario . . . . . . . . . . . . . . 46.3.1 System Description . . . . . . . . . . . . . . . . . . . . . . . . 46.3.2 Numerical Result . . . . . . . . . . . . . . . . . . . . . . . . . 49 CONCLUSION 51ibliography 5
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
sj-pdf-1-ang-10.1177_00033197221105745 – Supplemental Material for Non-Invasive Liver Fibrosis Scores Are Associated With Contrast-Associated Acute Kidney Injury in Patients Undergoing Elective Percutaneous Coronary Intervention
No full textSupplemental Material, sj-pdf-1-ang-10.1177_00033197221105745 for Non-Invasive Liver Fibrosis Scores Are Associated With Contrast-Associated Acute Kidney Injury in Patients Undergoing Elective Percutaneous Coronary Intervention by Hao-Ming He, Chen He, Zhe-Bin You, Si-Cheng Zhang, Xue-Qin Lin, Man-Qing Luo, Mao-Qing Lin, Li-Wei Zhang, Kai-Yang Lin and Yan-Song Guo in Angiology</p
Supplemental Material - Prognostic Value of Different Versions of the Model for End-Stage Liver Disease Score in Patients Undergoing Percutaneous Coronary Intervention
No full textSupplemental Material for Prognostic Value of Different Versions of the Model for End-Stage Liver Disease Score in Patients Undergoing Percutaneous Coronary Intervention by Hao-ming He, Chen He, Zhe-bin You, Si-cheng Zhang, Xue-qin Lin, Man-qing Luo, Mao-qing Lin, Li-wei Zhang, Kai-yang Lin, and Yan-song Guo in Angiology</p
TzuHusan/MV_Microbiome: Terrestrial Mud volcano microbiome
No full textData, sequence analysis ploting for the microbiome figures included in the paper: [Tzu-Hsuan Tu, Li-Ling Chen, Yi-Ping Chiu, Li-Hung Lin, Li-Wei Wu, Francesco Italiano,
J. Bruce H. Shyu, Seyed Naser Raisossadat, and Pei-Ling Wang: The biogeographic pattern of microbial communities inhabiting terrestrial mud volcanoes across the Eurasian continent
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