發(fā)布時間：2018-11-21 17:31

【摘要】：無線通信技術因為其成本較低和使用、部署簡單方便的特點在人們的生活、工作中有了越來越重要的地位。目前普遍使用的無線終端的工作頻段都在微波頻段,主要是2.4G和5G頻段,這些頻段可用帶寬小。相反的,隨著各類無線終端設備數量的大量增加,現(xiàn)有的無線通信網絡的數據傳輸速率無法滿足龐大用戶群體日益增加的高傳輸速率需求,現(xiàn)階段用戶追求的傳輸速率高達多個Gbps。鑒于2.4G和5G頻段頻譜資源的不足,可用帶寬少,因此開發(fā)新的頻段勢在必行,而毫米波段因為具有更大帶寬,正受到越來越多的關注。毫米波因為其頻譜特性,在傳播過程中有很大的損耗,因此需要使用波束成形技術,將復用增益、分集增益、天線增益、陣列增益以及干擾消除等進行結合,進一步增加通信鏈路的容量。在IEEE802.11ad等毫米波通信系統(tǒng)中,普遍采用了混合波束賦形技術,即通過陣列天線波束成形而獲得的天線增益和陣列增益,有效補償毫米波頻段過大的路徑損耗和穿透損耗,將數字波束成形和模擬波束成形進行級聯(lián),進一步充分利用其復用增益和分集增益。論文重點圍繞IEEE802.11ad標準的波束訓練流程,詳細地說明了毫米波通信系統(tǒng)中所采用的扇區(qū)級掃描和波束優(yōu)化過程,并分析了每個階段中收發(fā)端的天線波束狀態(tài)。然后對IEEE802.11ad進行了鏈路級仿真,搭建了仿真平臺,并給出了仿真曲線進行校準。針對混合波束賦形接收端反饋開銷過大的問題,論文給了一種適用于IEEE802.11ad波束成形訓練反饋設計方案,以有效滿足毫米波通信系統(tǒng)波束賦形訓練要求。在毫米波無線通信系統(tǒng)中很容易配置使用更多天線單元,而天線數量的增多意味著仍然使用傳統(tǒng)的數字波束成形技術在成本和復雜度上變得無法接受。論文圍繞低復雜度的部分連接架構,研究了射頻鏈路數與能效和譜效的關系,重點研究在保證增益的前提下最優(yōu)的射頻鏈路數。論文首先分析了部分連接架構下,能效、譜效和射頻鏈路數之間的關系,然后證明了在考慮鏈路器件功率的前提下,存在一個最佳功率點,也就是綠點(Green Point)。其次分析了給定譜效的條件下,鏈路數對能效的影響,分析表明,當譜效確定時,存在一個最優(yōu)的射頻鏈路數,可以使系統(tǒng)獲得最佳的能效。最后分析了最優(yōu)能效和射頻鏈路數的關系。論文分析結果表明,當射頻鏈路數和每個子陣列天線數不相關時,最優(yōu)能效隨著射頻鏈路數單調遞增。
[Abstract]:Wireless communication technology has become more and more important in people's life and work because of its low cost and convenient deployment. At present, the widely used wireless terminals are in the microwave frequency band, mainly 2.4G and 5G band, these band available bandwidth is small. On the contrary, with the large increase in the number of wireless terminal devices, the data transmission rate of the existing wireless communication network can not meet the increasing demand for high transmission rate by a large number of users. At this stage, the rate of transmission pursued by users is as high as multiple Gbps.. In view of the shortage of spectrum resources in 2.4G and 5G bands and the less available bandwidth, it is imperative to develop new frequency bands, while millimeter band is attracting more and more attention because of its larger bandwidth. Millimeter wave has great loss in the propagation process because of its spectrum characteristic, so it is necessary to use beamforming technology to combine multiplexing gain, diversity gain, antenna gain, array gain and interference cancellation, etc. Further increase the capacity of communication links. In IEEE802.11ad and other millimeter-wave communication systems, hybrid beamforming technology is widely used, that is, antenna gain and array gain obtained by array antenna beamforming can effectively compensate the excessive path loss and penetration loss in millimeter wave band. Digital beamforming and analog beamforming are cascaded to make full use of their multiplexing and diversity gains. Focusing on the beam training flow of IEEE802.11ad standard, the sector-level scanning and beam optimization process used in millimeter-wave communication system are described in detail, and the antenna beam state at the transceiver in each phase is analyzed. Then the link level simulation of IEEE802.11ad is carried out, the simulation platform is built, and the simulation curve is given to calibrate. In order to solve the problem that the feedback overhead of hybrid beamforming receiver is too large, this paper presents a design scheme for IEEE802.11ad beamforming training feedback, which can effectively meet the requirements of beamforming training in millimeter wave communication systems. It is easy to configure more antenna elements in millimeter-wave wireless communication systems, and the increase in the number of antennas means that the traditional digital beamforming technology is not acceptable in cost and complexity. In this paper, the relationship between the number of RF links, energy efficiency and spectral efficiency is studied, and the optimal number of RF links is studied under the premise of guaranteed gain. This paper first analyzes the relationship between energy efficiency, spectral effect and the number of RF links under partial connection architecture, and then proves that there exists an optimal power point, that is, Green Point (Green Point)., under the premise of considering the power of link devices. Secondly, the influence of the number of links on energy efficiency is analyzed under the given spectral effect. The analysis shows that there is an optimal number of RF links when the spectral effect is determined, which can make the system obtain the best energy efficiency. Finally, the relationship between the optimal energy efficiency and the number of RF links is analyzed. The results show that the optimal energy efficiency increases monotonously with the number of RF links when the number of RF links is not correlated with the number of antennas per sub-array.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN928

【參考文獻】

相關期刊論文 前7條

1 張福恒;;均勻直線式天線陣方向圖分析[J];海南師范大學學報(自然科學版);2011年04期

2 張健;劉元安;謝剛;毛峻嶺;劉芳;;低復雜度的多用戶MIMO下行鏈路塊對角化算法[J];電子科技大學學報;2011年05期

3 許銳鋒;關建新;;多天線系統(tǒng)中的波束形成原理辨析[J];艦船電子工程;2011年09期

4 席紅旗;孔國利;;均勻直線陣天線的分析[J];水利電力機械;2006年04期

5 林華芳,徐明遠;均勻直線陣的波束形成[J];信息技術;2003年05期

6 馬靜,史小衛(wèi);智能天線波束形成原理與實現(xiàn)[J];電信快報;2002年07期

7 桑懷勝,李崢嶸;智能天線的原理、自適應波束形成算法的研究進展與應用[J];國防科技大學學報;2001年06期

，

本文編號：2347715