改良式強化學習於太陽能獵取之 多用戶上鏈功率控制研究

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姓名

高懿辰(KAO YI-CHEN) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

改良式強化學習於太陽能獵取之多用戶上鏈功率控制研究
(Novel Reinforcement Learning-based Multiuser Uplink Power Control with Solar Energy Harvesting)

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摘要(中)

能量獵取技術(Energy Harvest)被視為能夠實現延長無線通訊設備使用時效及自我維持工作條件的有效技術，而近些年來物聯網的興起，小規模的無線通訊遽烈增加，由於有限容量電池的限制，小規模無線通訊裝置有著電量消耗及使用時效的問題，而能量獵取技術能夠藉由獵取周遭環境的能源來維持小規模無線通訊裝置使用時效並最佳化功率控制藉此解決有限容量電池造成的消耗及裝置壽命問題。為了最大化無線通訊系統整體傳輸吞吐量，傳統可以使用凸優化、馬可夫決策過程等最佳化方式來進行系統效能的最佳化，但上述方法存在著必須得知未來一段時間的通道增益、能量獵取情況、系統狀態轉移機率才能夠執行最佳化的計算，而強化學習基於與環境的相互探索，能夠藉由多次的疊代優化出最佳的動作價值函數。
本論文採用強化學習(Reinforcement Learning)來最佳化無線通訊系統的行動策略(policy)，藉由使用獵取能量數值、有限容量電池數值及無線通道增益來定義出馬可夫決策過程中的狀態，研究能量獵取無線通訊上鏈系統在多用戶的環境下之功率控制最佳方案，並且在觀察狀態的資訊後，可以得到在電池狀態分量中有著小區段線性相關的關係，藉由加權方式改進傳統強化學習的探索及評估數值使系統效能在複雜度小幅提升的情況下，使基於能量獵取的多用戶無線通訊上鏈系統的傳輸吞吐量有明顯的增加。

摘要(英)

Energy harvesting is regarded as an effective technology that can extend the lifetime of wireless communication applications and self-sustain working conditions. In recent years, the rise of the Internet of Things has led to a rapid increase in small-scale wireless communication. Restrictions, small-scale wireless communication devices have power consumption and use time issues, and energy harvesting technology can maintain the use timeliness of small-scale wireless communication devices by gathering energy from the surrounding environment and optimize power control to solve the problem of limited capacity batteries consumption and device life issues. In order to maximize the overall transmission throughput of the wireless communication system, optimization methods such as convex optimization and Markov decision process can be used to optimize the system performance by power control. However, the above methods rely on the perfect knowledge of the future information of energy harvesting conditions and channel gains control, which makes it difficult to be implemented in real applications. Reinforcement learning can approximate the best action-value function by multiple iterations based on mutual exploration with the environment.
In this thesis, reinforcement learning is used to optimize the action strategy of the wireless communication system. By using the harvested energy value, the limited capacity battery value, and the wireless channel gain to define the state in the Markov decision process, this thesis investigate energy harvesting power control of uplink wireless communication systems in a multi-user environment, and after observing the state of the environment information, it can be obtained that there is a piecewise linear correlation in a battery state component, and the conventional reinforcement learning is improved by weighting the exploration and evaluation values of learning enable the system performance to be slightly increased in the case of a small increase in complexity, which significantly increases the transmission throughput of the multi-user wireless communication uplink system based on energy harvesting.

關鍵字(中)

★ 強化學習
★ 多層感知器
★ 能量獵取
★ 功率控制

關鍵字(英)

★ Reinforcement Learning
★ Deep Neural Networks
★ Energy Harvesting
★ Power Control

論文目次

目錄
摘要 i
Abstract ii
致謝 iv
目錄 v
圖目錄 vii
表目錄 viii
符號說明 ix
第一章緒論 1
1-1研究動機 1
1-2文獻探討 4
1.2.1具能量獵取功能的無線通訊系統 4
1.2.2深度學習與強化學習於無線通訊設計相關應用 5
第二章背景理論介紹 7
2-1能量獵取模型(Energy Harvesting Model) 7
2-2馬可夫決策過程(Markov Decision Processes) 8
2-3強化學習(Reinforcement Learning) 9
2-3-1 Q學習(Q-Learning) 11
2-3-2深度強化學習(Deep Reinforcement Learning) 12
2-4瓦片編碼(Tile Coding) 14
第三章基於強化學習的多用戶無線通訊上鏈系統 15
3-1太陽能獵取數據模型 15
3-2 多用戶系統模型 16
3-2-1多用戶通道容量最佳化問題 17
3-3 強化學習之多用戶功率控制 18
3-4區域加權強化學習方法 22
3-5基於瓦片編碼之多用戶無線功率控制 26
3-6深度強化學習之多用戶功率控制 30
第四章模擬結果 38
4-1 基於強化學習多用戶上鍊功率控制模擬結果 39
第五章結論 45
參考文獻 46

參考文獻

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指導教授

古孟霖(Meng-Lin Ku)

審核日期

2021-1-6

推文