基於扎德奧夫-朱序列之混合式波束合成系統時域通道估測技術;Time-Domain Channel Estimation Based on Zadoff-Chu Sequence for Hybrid Beamforming Systems

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Title:	基於扎德奧夫-朱序列之混合式波束合成系統時域通道估測技術;Time-Domain Channel Estimation Based on Zadoff-Chu Sequence for Hybrid Beamforming Systems
Authors:	蔡駿全;Tsay, Jiunn-Chyuan
Contributors:	電機工程學系
Keywords:	混合式波束合成系統;通道估測;扎德奧夫-朱序列;Hybrid beamforming system;Channel estimation;Zadoff-Chu Sequence
Date:	2021-09-16
Issue Date:	2021-12-07 13:16:06 (UTC+8)
Publisher:	國立中央大學
Abstract:	在本論文中，我們在MiWEBA (Millimeter-wave Evolution for Backhaul and Access) 的通道模型上利用扎德奧夫-朱序列(Zadoff-Chu)與離散傅立葉矩陣所建立的碼簿，在時域上實現混合式波束合成寬頻通訊系統中的通道估測。MiWEBA通道模型適用於57-66GHz並建構基於毫米波通道脈衝響應之表現，即為部分強通道(strong rays)(D-rays)與數量相當之相應的弱隨機通道(weak random rays)(R-rays)之疊加。大量天線被使用於新世代通訊系統中用以提升收發站頻譜效率，而通過控制收發站之相移器(Phase shifter)便可形成波束合成(beamforming)用以指向特定角度使得訊雜比能夠提高，而混合式波束合成即是結合了類比相移器與數位前編碼，藉以減少全數位前編碼器在基頻的運算量。我們提出的演算法將利用扎德奧夫-朱序列之自相關特性與互相關特性，辨別出混合式波束合成中使用之接收端、發送端射頻鏈編號與碼簿中所對應角度之碼字，並利用查表法經過第一次、第二次削除以移除互相關特性，最後以殘留之候選矩陣用以進行混合式波束合成寬頻通訊系統之通道估測。在殘留之候選矩陣中，峰值之碼字可以對應路徑的發射角與入射角度，峰值之複數值與延遲位置即為通道路徑之脈衝響應與延遲我們希望藉由此演算法的嘗試，系統的模擬與分析，為日後實際建構硬體時有參考依據。;This thesis presents a time-domain channel estimation method based on Zadoff-Chu Sequence and DFT codebook for millimeter wave hybrid beamforming systems. The MiWEBA channel model is used which describes mmWave channel im-pulse response as a superposition of a few strong rays (D-rays) and a number of rela-tively weak random rays (R-rays) in 57-66GHz. Massive antennas are gradually adopted to increase spectral efficiency in advanced wireless communication systems. Hybrid beamforming techniques combining analog phase shifter and digital precoder can reduce the complexity of fully-digital precoder. The channel estimation needs to estimation angle of arrival, angle of departure, path delay and path gain in massive MIMO hybrid beamforming systems. Our proposed algorithm uses Zadoff-Chu Se-quence, which has zero autocorrelation and excellent cross-correlation properties, to distinguish the beam patterns associated with the RF chains. The interference can be eliminated by the known cross-correlation with a look-up table. The peak positions of the correlation after interference cancellation then provide the information about the magnitude and delay of the channel impulse response. The simulation results verify the design.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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