| 研究課題/領域番号 |
25289113
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| 研究機関 | 北陸先端科学技術大学院大学 |
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研究代表者 |
KHOIRUL Anwar 北陸先端科学技術大学院大学, 情報科学研究科, 助教 (20535372)
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| 研究分担者 |
松本 正 北陸先端科学技術大学院大学, 情報科学研究科, 教授 (40452114)
楫 勇一 奈良先端科学技術大学院大学, 情報科学研究科, 准教授 (70263431)
KURKOSKI Brian 北陸先端科学技術大学院大学, 情報科学研究科, 准教授 (80444123)
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| 研究期間 (年度) |
2013-04-01 – 2016-03-31
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| キーワード | 情報通信工学 / 情報理論 / 無線通信 / 符号理論 |
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| 研究実績の概要 |
In this second year, we achieved very significant results on the research of STAR-CODE. We already reached some of our goals to create efficient communications concept for multiterminal networks where the user make data exchange, the applications of which is very important in the future, e.g., disaster area communications, 5G systems and beyond with devices more than 50 billions.
We invent three basic concepts.Some of them have been presented in international conference in Europe and some are going to be presented in June 2015.Our new inventions are:
(1). Theoretical bounds: The bounds is the first time derived based on the EXIT chart analysis. (2). We found practical coding schemes for achieving the bound in (1). (3). We found how to exploit the correlations so that the power can be minimized while the space diversity is achievable. Correlation is achieved from two ways:
(a) via direct links, because some users may receive signal directly from others, and (b) from the repetition coding scheme, since the user transmit several time the same message to make decoding is possible via different time slots. We finally make the network structure to be seen as a coding structure.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
This second year is the results of the hard works in first year. In the first year, we had difficulties on theoretical basis because it is new topic. There are no literature about how to solve data exchange of huge number of users via multiway relays. There are some, but they are very trivial which is considering only three users.
This year we are very happy because we finally succeeded in building the theoretical basis for STAR-CODE. We connected the network-on-the graph to the code-on-the graph, where the traffic can be defined flexibly. We also have good publications in high rank international level.
Our practical coding schemes also works with hundreds and thousands of users. I think this is a very big achievements for our team this year.
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| 今後の研究の推進方策 |
Based on the document of our project proposal, WP for the rest of the year are:
WP5: Optimization, WP5.1: Labelling and decoding, WP5.2: Rate Allocations --> optimal rate for each user, WP5.3: Power allocations --> less power consumption
We are now under the correct direction and plans. We already found the theoretical bounds, however, the practical coding schemes requires optimization. We have tools for optimization:
(1) EXIT chart analysis: This EXIT chart is based on erasure probability, where from the matching of EXIT curves (between the slot nodes and user nodes), we can obtain the best degree distribution.
(2) Maximum Distance Separable (MDS) codes: With MDS we can more flexibly change the curve of the user node. This optimization is performed by using genetic algorithm.
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| 次年度使用額が生じた理由 |
This year we postponed the steering committee from March 2015 to June 2015.
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| 次年度使用額の使用計画 |
We will use the budget for: 1. Steering Committee Meeting, June 2015, 2. Paying salary for project worker (2 persons), 3. IEEE ICC International conference in London, UK, June 2015.
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