【摘要】：在移動(dòng)互聯(lián)網(wǎng)時(shí)代的今天,用戶(hù)對(duì)通信技術(shù)的各方面要求越來(lái)越高。長(zhǎng)期演進(jìn)計(jì)劃((long term evolution,LTE)作為擁有高傳輸速率、高傳輸質(zhì)量和移動(dòng)性能的通信手段,成為了移動(dòng)通信系統(tǒng)中倍受關(guān)注的研究熱點(diǎn)。隨著高速鐵路的發(fā)展,其對(duì)在高移動(dòng)速度下的通信要求更為苛刻。然而,LTE系統(tǒng)下行的正交頻分多址(orthogonal frequency division multiplexing access,OFDMA)技術(shù)與上行的單頻載波多址(single-carrier frequency-division multiple access,SC-FDMA)技術(shù)在高速度移動(dòng)環(huán)境下對(duì)頻率偏差表現(xiàn)得更為敏感,多普勒頻移也更加明顯。這使得LTE面臨著巨大的挑戰(zhàn)。本文從TDD-LTE的多普勒頻移對(duì)抗入手,重點(diǎn)研究TDD-LTE系統(tǒng)在高速鐵路環(huán)境下的相關(guān)技術(shù)。首先,對(duì)LTE系統(tǒng)的構(gòu)架、接口、物理層及核心技術(shù)OFDM進(jìn)行概述,同時(shí)對(duì)通信信道以及高鐵通信的特殊環(huán)境及信道進(jìn)行介紹,并對(duì)LTE上行、下行相關(guān)理論進(jìn)行初步討論。然后,重點(diǎn)研究下行鏈路在小區(qū)終端射頻單元(Radio Remote Unit,RRU)切換時(shí)產(chǎn)生的多普勒突跳,以及上行鏈路在多個(gè)用戶(hù)條件下的子載波干擾與用戶(hù)間干擾。進(jìn)而,針對(duì)TDD-LTE系統(tǒng)提出了有效解決下行多普勒突跳的方案及算法。同時(shí),研究并比較了多種上行鏈路抗用戶(hù)間干擾算法,給出了接近沒(méi)有用戶(hù)間干擾的理想解決辦法。最后,利用本文算法在京津高鐵案例TD-LTE覆蓋區(qū)專(zhuān)線試驗(yàn)區(qū)與非試驗(yàn)區(qū)進(jìn)行實(shí)驗(yàn),并根據(jù)對(duì)比數(shù)據(jù)得出結(jié)論,以此說(shuō)明本文討論的相關(guān)優(yōu)化算法以及解決方案在實(shí)際應(yīng)用中的意義。
[Abstract]:In the era of mobile Internet, users have higher and higher requirements for all aspects of communication technology. Long-term evolution plan (long term evolution,LTE), as a means of communication with high transmission rate, high transmission quality and mobile performance, has become a hot research topic in mobile communication systems. With the development of high-speed railway, the communication requirements at high mobile speed are more stringent. However, the orthogonal frequency division multiple access (orthogonal frequency division multiplexing access,OFDMA) technology and uplink single frequency carrier multiple access (single-carrier frequency-division multiple access,SC-FDMA) technology in LTE system are more sensitive to frequency deviation and Doppler shift in high speed mobile environment. This makes LTE face great challenges. Starting with the Doppler shift confrontation of TDD-LTE, this paper focuses on the related technologies of TDD-LTE system in high-speed railway environment. Firstly, the architecture, interface, physical layer and core technology OFDM of LTE system are summarized. At the same time, the communication channel and the special environment and channel of high-speed rail communication are introduced, and the related theories of uplink and downlink of LTE are discussed. Then, the Doppler jump caused by downlink switching of cell terminal radio frequency unit (Radio Remote Unit,RRU), as well as the subcarrier interference and inter-user interference of uplink under multiple user conditions are studied. Furthermore, an effective scheme and algorithm to solve the downlink Doppler jump for TDD-LTE system is proposed. At the same time, a variety of uplink anti-inter-user interference algorithms are studied and compared, and an ideal solution is given, which is close to no inter-user interference. Finally, the algorithm is used to carry out experiments in the special line test area and non-test area of TD-LTE coverage area of Beijing-Tianjin high-speed railway case, and the conclusion is drawn according to the comparative data, so as to illustrate the significance of the relevant optimization algorithm discussed in this paper and the solution in practical application.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN929.5

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