發(fā)布時間：2018-01-22 01:33

  本文關(guān)鍵詞： 長期演進(jìn) 物理下行共享信道 波束賦形 信道估計　出處：《武漢郵電科學(xué)研究院》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文對于TD-LTE系統(tǒng)中波束賦形的相關(guān)技術(shù)進(jìn)行了分析及研究，并給出了相應(yīng)的仿真結(jié)果。 本文首先針對TD-LTE物理層特性，例如無線幀結(jié)構(gòu)，物理層各個信道與參考信號以及OFDM技術(shù)進(jìn)行了概述。因為本文的波束賦形相關(guān)內(nèi)容是在下行共享信道上加以實現(xiàn)的，因此對下行共享信道的關(guān)鍵技術(shù)進(jìn)行了相關(guān)介紹，重點介紹了MIMO的三種方案，分別是發(fā)射分集，空分復(fù)用以及波束賦形。 本文在第四章分別從單用戶波束賦形以及多用戶波束賦形的角度著重分析了波束賦形過程中的相關(guān)技術(shù)，，包括基站側(cè)計算波束賦形權(quán)向量的算法以及在UE側(cè)的相關(guān)檢測算法。 關(guān)于基站側(cè)波束賦形權(quán)向量的獲取方法，重點分析了單用戶波束賦形中現(xiàn)有的獲取波束賦形權(quán)向量的方案，并針對現(xiàn)有方案的缺點提出了一種新的獲取波束賦形權(quán)向量的方法。 關(guān)于UE側(cè)的相關(guān)檢測算法，重點分析了信道估計算法，即在波束賦形方案下用DM-RS作為導(dǎo)頻信號傳輸?shù)那闆r下，如何獲取導(dǎo)頻點處的信道系數(shù)，以及通過各種插值算法獲取整個頻域方向的信道系數(shù)。在頻域插值算法的推導(dǎo)中，針對下行DM-RS的分布在連續(xù)PRB上來看并不是等間隔分布的特點，對頻域插值算法中的DFT變換域插值算法進(jìn)行改進(jìn)，并在第五章仿真結(jié)果分析中對改進(jìn)的算法進(jìn)行了驗證。
[Abstract]:In this paper, the related techniques of beamforming in TD-LTE system are analyzed and studied, and the corresponding simulation results are given. This paper first focuses on the physical layer characteristics of TD-LTE, such as wireless frame structure. The physical layer of each channel and reference signal and OFDM technology are summarized, because the beamforming related content in this paper is implemented on the downlink shared channel. Therefore, the key technologies of the downlink shared channel are introduced, and the three schemes of MIMO, namely transmit diversity, space-division multiplexing and beamforming, are emphatically introduced. In chapter 4th, we analyze the technology of beamforming from the angle of single user beamforming and multiuser beamforming. The algorithm of calculating beamforming weight vector on base station side and correlation detection algorithm on UE side are included. Regarding the method of obtaining the weight vector of the side beam of the base station, the existing scheme of obtaining the weight vector of the beam shape in the single user beamforming is analyzed emphatically. A new method to obtain beamforming weight vector is proposed to overcome the shortcomings of the existing scheme. For the correlation detection algorithm of UE side, the channel estimation algorithm is mainly analyzed, that is, how to obtain the channel coefficient at pilot point when DM-RS is used as pilot signal transmission under beamforming scheme. In the derivation of frequency-domain interpolation algorithm, the distribution of downlink DM-RS on continuous PRB is not equal-interval distribution. The DFT transform domain interpolation algorithm in frequency domain interpolation algorithm is improved, and the improved algorithm is verified in the analysis of simulation results in Chapter 5th.
【學(xué)位授予單位】：武漢郵電科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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相關(guān)期刊論文 前2條

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