基於雙極化天線的混合波束成型多輸入多輸出毫米波通訊系統;Hybrid Beamforming MIMO mmWave Communication Systems Based on Dual-Polarized Antenna

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Title:	基於雙極化天線的混合波束成型多輸入多輸出毫米波通訊系統;Hybrid Beamforming MIMO mmWave Communication Systems Based on Dual-Polarized Antenna
Authors:	曾偉恩;Tseng, Wei-En
Contributors:	通訊工程學系
Keywords:	混合波束成型;多輸入多輸出正交分頻多工;雙極化天線;正交匹配追蹤;連續干擾消除;Hybrid Beamforming;MIMO-OFDM;Dual-Polarized Antenna;OMP;SIC
Date:	2023-08-21
Issue Date:	2023-10-04 15:27:47 (UTC+8)
Publisher:	國立中央大學
Abstract:	毫米波（Millimeter wave，mmWave）是5G（5th generation wireless systems，簡稱5G）無線通訊的重要技術，在高頻傳輸下，擁有更高的資料傳輸速率（Data rate），同時有著更低的延遲，但是在傳輸的過程中，卻有著相當大的損耗，以致於通訊品質大幅下降。為了克服上述的影響，導入了波束成型（Beamforming）技術，來為傳輸過程提供指向性，以降低損耗。在波束成型的架構中，我們需要考量硬體成本、設計的複雜度還有可服務對象的數量，綜合以上考量，我們選擇了混合波束成型（Hybrid Beamforming），以取得在頻譜效率（spectral efficiency）以及成本上的平衡，混合波束成型中，每組射頻鏈（Radio Frequency chain，RF chain）透過移相器（phase shifter）與每根天線連接，為了再更進一步的下降成本，有人提出了子連結（sub-connected）架構，使得每組射頻鏈只連結到對應的子陣列（sub array），來降低硬體成本及設計複雜度，但因為射頻鏈沒有連結到每一根天線，導致頻譜效率有所下降。在本文中，我們採用多路徑三維通道（multi-path three-dimensional（3D）channel）為通道環境，並將擁有水平極化（horizontal polarization）以及垂直極化（vertical polarization）的雙極化天線（dual-polarized antenna）帶入通訊系統中，透過控制交叉極化隔離（cross-polar discrimination，XPD），來增加訊號的集中，以提升增益，並使用連續干擾消除（Successive Interference Cancelation，SIC）算法，計算出預編碼器（precoder）和組合器（combiner）的權重，以計算出其頻譜效率，最後再與全連結架構（fully-connected）下的混合波束成型做比較。;Millimeter wave is an important technology for 5G (5th generation wireless systems, 5G for short) wireless communication. Under highfrequency transmission, it has a higher data transmission rate (Data rate) and a lower delay. However, during the transmission process, However, there is a considerable loss, so that the communication quality is greatly reduced. In order to overcome the impact, we have introduced beamforming technology to provide directivity for the transmission process to reduce loss. In the beamforming architecture, we need to consider hardware cost, design complexity, and the number of service objects. Basedon the above considerations, we chose hybrid beamforming to achieve a balance between spectral efficiency and cost. In hybrid beamforming, each radio frequency chain (RF chain) is connected to each antenna through a phase shifter. In order to further reduce the cost, someone proposed a sub-connected architecture, so that each radio frequency chain is only connected to The corresponding sub-array is used to reduce hardware cost and design complexity, but because the radio frequency chain is not connected to each antenna, the spectral efficiency is reduced. In this paper, we use a multi-path three-dimensional (3D) channel with the dual-polarized antenna which had horizontal polarization and vertical polarization into the communication system, by controlling the cross-polar discrimination (XPD), the concentration of the signal is increased to increase the gain, and the successive interference cancelation (SIC) algorithm is used to calculate the weight of the precoder and combiner to calculate its spectral efficiency, and finally compare it with the hybrid beamforming under the fully-connected architecture.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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