本文選題：有源天線LTE系統(tǒng) + 波束賦型��； 參考：《北京郵電大學》2014年碩士論文

【摘要】：近年來移動通信技術(shù)發(fā)展迅猛,電信運營商之間的網(wǎng)絡(luò)服務(wù)質(zhì)量競爭越來越激烈,當前基站天線的性能將無法滿足未來移動通信網(wǎng)絡(luò)的需求。有源天線作為新興集成化天線的代表,一方面可以實現(xiàn)靈活變化的網(wǎng)絡(luò)覆蓋,另一方面可以利用天線設(shè)備有源集成的優(yōu)勢,消除射頻電纜以及鏈路質(zhì)量下降引起的損耗,系統(tǒng)用戶峰值傳輸速率和整個站點的數(shù)據(jù)傳輸能力將得到有效地提升。LTE作為新一代的通信系統(tǒng),具有廣闊的發(fā)展前景。本文就針對有源天線在LTE中的應(yīng)用展開研究。 第一,提取波束賦型LMS算法作為基礎(chǔ)研究點。由于傳統(tǒng)的LMS算法步長固定,不能根據(jù)誤差的變化而改變,其后學者提出了一種變步長LMS算法,可以根據(jù)誤差來改變步長,實現(xiàn)了步長值的動態(tài)變化,但是其在低信噪比條件下誤差收斂性能欠佳,因此本文在其基礎(chǔ)上進行改進,使用誤差函數(shù)的相關(guān)值作為步長變化因子的DS-LMS算法,實現(xiàn)在低信噪比條件下具有較好的誤差收斂性能,同時保證其在高信噪比下的性能。然后使用一種多行多列天線陣列方案,根據(jù)改進的DS-LMS算法得到天線陣列增益值表,用于有源天線在LTE中仿真。 第二,使用仿真對有源天線在LTE中的應(yīng)用進行分析。由于維也納大學仿真平臺在天線模型、網(wǎng)絡(luò)拓撲等模塊不具有有源天線系統(tǒng)仿真的適用性,因此根據(jù)本文的仿真場景需求進行模塊添加和改進。主要工作是使用仿真方法,當用戶均勻分布時,對有源天線在LTE系統(tǒng)中的下傾角進行優(yōu)化選擇,對其性能表現(xiàn)進行分析評估,得到系統(tǒng)最優(yōu)遠近下傾角。然后使用單主瓣波束場景作為基準系統(tǒng)與使用最優(yōu)遠近傾角的有源天線系統(tǒng)進行對比分析,并仿真不同用戶位置分布條件下二者的性能差異,最后得出有源天線在LTE系統(tǒng)中具有廣泛適用性的結(jié)論。
[Abstract]:With the rapid development of mobile communication technology in recent years, the network service quality competition between telecom operators is becoming more and more fierce. The performance of the base station antenna will not meet the needs of the future mobile communication network. Active antenna, as the representative of the newly integrated antenna, can be realized with flexible network coverage on the one hand, and on the other hand it can benefit. With the advantage of active integration of antenna devices, the loss caused by radio frequency cable and link quality decline is eliminated. The peak transmission rate of the system users and the data transmission ability of the whole site will be effectively promoted as a new generation of communication system, which has broad prospects for development. This paper is aimed at the application of active antenna in LTE. Research.
First, the beamforming LMS algorithm is used as the basic research point. Since the traditional LMS algorithm is fixed and can not be changed according to the variation of the error, a variable step size LMS algorithm is proposed by the scholar, which can change the step length according to the error and realize the dynamic change of the step size. But the error convergence performance under the low SNR condition is not good. Therefore, this paper improves on the basis of it, uses the correlation value of the error function as the DS-LMS algorithm of the step length change factor, and achieves better error convergence performance under the low SNR condition and ensures its performance under high signal to noise ratio. Then, a multi row multi column antenna array scheme is used, according to the improved DS-LMS algorithm. The antenna array gain value table is obtained for active antenna simulation in LTE.
Second, use simulation to analyze the application of active antenna in LTE. Because of the simulation platform of University of Vienna, the module of antenna, network topology and other modules do not have the applicability of the active antenna system simulation, so the module is added and improved according to the requirements of the simulation scene in this paper. The main work is to use the simulation method, when the user is uniform. In the distribution, the down tilt angle of the active antenna in the LTE system is optimized. The performance of the active antenna is analyzed and evaluated, and the optimal remote and near dip angle is obtained. Then the single main lobe beam scene is used as the reference system to compare the active antenna system using the optimal and near dip angle, and the conditions of different user location distribution are simulated. Finally, the conclusion is drawn that the active antenna has wide applicability in the LTE system. Two.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5;TN820

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