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Multiuser MIMO Downlink Beamforming Based on Group Maximum SINR Filtering with Per Stream Power Allocation
No full text
A Unified Framework for Quantum Random Walk Algorithms on General Graphs
No full text在文獻中，有幾個量子演算法已被證明具有優越性超過其相對應之傳統演算法。最近的一個是量子隨機漫步。我們提出一個量子隨機漫步於一般圖形的統一架構。引進單一標籤的概念進入量子隨機漫步演算法。如果單一約束都無法滿足，我們還提供另一種中間量測的方法。我們並以幾個例子說明了所設計的演算法能保持量子干涉性質。In the literature, several quantum computation algorithms have been shown to have superiority over their classical counterparts. The most recent one is quantum random walks. We propose a unified framework for quantum walk algorithms on general graphs. We introduce the concept of unitary labeling into the quantum walk algorithm, and also provide another solution with intermediate measurement if the unitary constraint is not satisfied. We also demonstrate that the designed algorithms maintain the quantum interfering property with a few examples.Chapter 1 Introduction 1
Chapter 2 Preliminaries 4
2.1 Quantum Computation 4
2.1.1 Quantum Bit 5
2.1.2 Quantum Gates 7
2.1.3 Quantum Algorithms 8
2.2 Random Walk 10
Chapter 3 Quantum Random Walk 12
3.1 Quantum Random Walk on a Line 12
3.2 Quantum Random Walk on Higher Dimensions 14
3.3 Quantum Random Walk on General Graph 16
Chapter 4 Quantum Random Walk on General Graphs 19
4.1 Regular Graph 19
4.2 Unitary Labeling 20
4.3 Quantum Walk with Unitary Labeling (QWUL) Algorithm 21
4.4 Edge-coloring 25
4.5 Quantum Walk with Intermediate Measurement (QWIM) Algorithm 28
Chapter 5 Simulation Results 32
5.1 QWUL on a Finite Line 32
5.2 QWIM on a Grid 34
Chapter 6 Conclusion and Future Work 39
References 4
Multiuser MIMO Downlink Beamforming with SINR Constraints
No full text在此一論文中，我們解決了多用戶多輸入多輸出下傳波束成形的問題。發射機是一個多天線的基站廣播給用戶。每個用戶都可以以多重天線接收。我們提出一個具訊號干擾雜訊比和功率分配的聯合收發波束成形下傳多用戶多輸入多輸出系統的解決辦法。波束成形的過濾器是一個利用集團內部合作的最大訊號干擾雜訊比的濾波器。利用它們之間的上傳下傳偶性，所提出的演算法迭代地計算收發波束成形過濾器和功率分配矩陣。In this work we aim to solve the multiuser MIMO downlink
beamforming problem. The transmitter is a multiantenna
base-station broadcasting to users. Each user may have multiple antennas at the receiver. A solution to the joint transmit-receive beamforming and power allocation under SINR constraints in the downlink of multiuser MIMO systems is proposed. The beamforming filter is a maximum SINR filter which exploits the intra-group cooperation. Taking advantage of the uplink-downlink duality property, the proposed algorithm iteratively compute the transmit-receive beamforming filters and the power allocation matrix.1 Introduction 3
1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 PreviousWork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 System Model and Problem Formulation 6
2.1 SystemModel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 ProblemFormulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Maximum SINR Beamforming 11
4 Power Allocation Strategies 14
4.1 Group Power Allocation . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.1 SumPower Constraint . . . . . . . . . . . . . . . . . . . . . . 15
4.1.2 Power Minimization . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Antenna Power Allocation . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 Power Minimization . . . . . . . . . . . . . . . . . . . . . . . 21
4.2.2 SumPower Constraint . . . . . . . . . . . . . . . . . . . . . . 22
5 Simulation Results 26
6 Conclusion 30
Bibliography 3
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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