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研究生： 楊凡
Fan Yang
論文名稱： 雲端無線接取網路中基於Wyner-ziv 壓縮之上下行波束成型
On Uplink and Downlink Beamforming Design for Cloud Radio Access Network with Wyner-Ziv Fronthaul Compression
指導教授： 林士駿
Shih-Chun Lin
口試委員: 黃昱智
Yu-Chih Huang
張縱輝
Tsung-Hui Chang
學位類別： 碩士
Master
系所名稱： 電資學院 - 電子工程系
Department of Electronic and Computer Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 34
中文關鍵詞： 波束成型 、前端壓縮 、上下行波束 、全雙工 、半雙工 、雲端無線接取
外文關鍵詞： beamforming, Wyner-Ziv, fronthaul compression, cloud radio access network, uplink, downlink
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  •  上一筆

    • 在本文中，我們考慮在雲端無線接取網路使用有限的前端容量的情境中，包括集中式基頻數位處理和具備全雙工的分散式遠端無線接取點，以及半雙工的上行和下行使用者。在這種情況下，我們希望最小化上行的總功率消耗。由於自干擾和分散式遠端無線接取點間干擾，波束形成設計問題不是凸函數問題，所以我們使用次優的演算法，交替式最佳化，並基於這個演算法，提出了一種新的選擇初值得方式。進一步，我們於前端使用Wyner-Ziv壓縮技術，但是式使用在較簡單的情況下，也就是遠端無線接取點只具備半雙工而不是全雙工，並在這個情況下推導出使用者可達到的傳輸速率，並附上實驗結果。

    In this thesis, we consider a cloud radio access network (CRAN) with finite frouthaul capacity, which includes a centralized baseband (BBU) pool and a set of full duplex (FD) remote radio heads (RRHs) serving a set of half duplex (HD) mobile users. In this situation, we want to minimize the total power of uplink and downlink. Due to the interference such as self-interference and inter-RRH interference, the beamforming design problem is not convex, so we use a suboptimal algorithm based on alternating optimization (AO), and propose a new algorithm by combining two methods to choose a initial variable for the algorithm of minimization problem. Further we consider a per-base-station SIC (successive interference cancellation) scheme that performs Wyner-Ziv compress-and-forward at RRHs, for simplicity, we use it in a half-duplex system model at RRH, and derive achievable rate for users under the finite fronthaul link. Finally, simulation results are presented to demonstrate both of the proposed algorithm and Wyner-Ziv compression.

    Contents 1 Introduction 4 1.1 C-ran architecture . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Full-duplex c-ran and beamforming design . . . . . . . . . . . . . . . 4 1.3 Wyner-Ziv compression . . . . . . . . . . . . . . . . . . .. . . . . . 5 2 Full-duplex cran without Wyner-Ziv 6 2.1 Downlink signal model . . . . . . . . . . . . . . . . . . . .. . . . . 7 2.2 Uplink signal model . . . . . . . . . . . . . . . . . . . . .. . . . . 9 2.3 Problem formulation . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Half-duplex cran with Wyner-Ziv 14 3.1 Uplink signal model . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2 Downlink signal model . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3 Problem formulation . . . . . . . . . . . . . . . . . . . . . . . . . 21 4 Conclusion 23 4.1 Simulation results for FD-cran without Wyner-Ziv . . . . . . . . . . 23 4.2 Simulation results for HD-cran with Wyner-Ziv . . . . . . . . . . . . 24 4.3 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

    References
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    [7] Shahram Shahbazpanahi, Alex B Gershman, Zhi-Quan Luo, and Kon Max Wong. Robust adaptive beamforming for general-rank signal models. IEEE Transactions on Signal Processing, 51(9):2257{2269, 2003.
    [8] Hsuan-Jung Su and E. Geraniotis. Maximum signal-to-noise ratio array processing for space-time coded systems. IEEE Transactions on Communications, 50(9):1419{1422, Sep 2002.
    [9] Zhengyi Ye. "Optimization of fronthaul compression based on the di erence of convex programming algorithm," MS Thesis NTUST 2016.
    [10] L. Zhou and W. Yu. Uplink multicell processing with limited backhaul via per-base-station successive interference cancellation. IEEE Journal on Selected Areas in Communications, 31(10):1981{1993, October 2013.

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