發(fā)布時(shí)間：2018-05-11 07:50

  本文選題：LTE + OFDM�。� 參考：《南京郵電大學(xué)》2017年碩士論文

【摘要】：第三代合作伙伴計(jì)劃3GPP(The 3rd Generation Partnershi Project)為了與全球微波互聯(lián)接入技術(shù)(WiMAX:Worldwide Interoperability for Microwave Access)競(jìng)爭(zhēng),提出并開(kāi)發(fā)了LTE(Long Term Evolution)。LTE并沒(méi)有被國(guó)際電聯(lián)承認(rèn)為4G標(biāo)注,可以將其看作是3G向4G的一個(gè)過(guò)渡,通常稱(chēng)之為3.9G。LTE兩大核心技術(shù)為OFDM/OFDMA(Orthogonal Frequency Division Multiple Access)和MIMO(Multiple-Input Multiple-Output),和3G網(wǎng)絡(luò)結(jié)構(gòu)相比,LTE網(wǎng)絡(luò)主要由基站(eNode B:Evolved Node B)和接入網(wǎng)關(guān)(AGW:Access Gateway)構(gòu)成,取消了無(wú)線網(wǎng)絡(luò)控制器(RNC:Radio Network Controller)實(shí)現(xiàn)了網(wǎng)絡(luò)結(jié)構(gòu)扁平化,降低了數(shù)據(jù)中轉(zhuǎn)帶來(lái)的時(shí)延;取消了了電路轉(zhuǎn)化,完成了固網(wǎng)和移動(dòng)網(wǎng)絡(luò)的融合,靈活支持多元化網(wǎng)絡(luò)幅度,網(wǎng)絡(luò)了網(wǎng)絡(luò)的全I(xiàn)P、系統(tǒng)容量得到提高,用戶的傳輸速率以及覆蓋范圍得到增大,運(yùn)營(yíng)成本能有效地降低。LTE的設(shè)計(jì)目的為使用20MHz的帶寬,是在20MHz帶寬下,數(shù)據(jù)上行速度達(dá)50Mbps(發(fā)射天線數(shù)目為1)和數(shù)據(jù)下行達(dá)100Mbps(接收天線數(shù)目為2)的峰值。和3G相比,LTE以其快速響應(yīng)和高速傳輸?shù)膬?yōu)勢(shì),能滿足高清視頻在線播放,文件快速傳輸?shù)葞缀跻磺杏脩魧?duì)無(wú)線服務(wù)的需求,而達(dá)到這一點(diǎn)與其關(guān)鍵技術(shù):正交頻分復(fù)用技術(shù)(OFDM)以及多天線技術(shù)(MIMO)密切相關(guān)的。本文著重研究了空時(shí)編碼技術(shù)中的D-BLAST編碼方式,并將其進(jìn)行改進(jìn),保證在較小的延遲的前提下實(shí)現(xiàn)滿發(fā)射矩陣占用率,并將改進(jìn)的編碼與主流編碼技術(shù)一齊運(yùn)用于收發(fā)不對(duì)等的天線陣列中,分析天線使用策略,從分集增益、復(fù)用增益、信噪比-誤碼率這三個(gè)指標(biāo)去評(píng)價(jià)其性能表現(xiàn)。結(jié)果表明:對(duì)D-BLAST的改進(jìn)在特定情況下利大于弊;增加接收天線獲得的性能收益往往比增加發(fā)射天線來(lái)的大。
[Abstract]:In order to compete with the global microwave interconnection technology WiMax: Worldwide Interoperability for Microwave Access), the third-generation partnership, 3GPP(The 3rd Generation Partnershi Project), has proposed and developed a LTE(Long Term Evolution).LTE that is not recognized by ITU as 4G tagging, and can be seen as a transition from 3G to 4G. Compared with 3G network structure, LTE network is mainly composed of base station eNode B:Evolved Node B) and access gateway AGW: access gateway. The cancellation of wireless network controller RNC: radio Network controller has flat network structure. It reduces the delay caused by data transfer, cancels the circuit conversion, completes the fusion of fixed network and mobile network, supports the range of multiple networks flexibly, and improves the system capacity by the full IPP of the network. The user's transmission rate and coverage are increased, and the operating cost can be effectively reduced. The purpose of the design is to use the bandwidth of 20MHz, which is based on the 20MHz bandwidth. The data uplink speed is 50 Mbpss (the number of transmitting antennas is 1) and the data downlink is 100 Mbpss (the number of receiving antennas is 2). Compared with 3G, LTE has the advantages of fast response and high speed transmission, which can meet the needs of almost all users for wireless services, such as on-line video playback and file fast transmission, etc. To achieve this is closely related to its key technologies: OFDM (orthogonal Frequency Division Multiplexing) and MIMOM (multiple antennas). This paper focuses on the D-BLAST coding method in space-time coding technology, and improves it to ensure the full transmission matrix occupancy rate under the condition of small delay. The improved coding and the mainstream coding techniques are applied to the antenna array with unequal transceiver and receiver, and the performance of the antenna is evaluated from the diversity gain, multiplexing gain, SNR and bit error rate (SNR). The results show that the improvement of D-BLAST is more beneficial than the disadvantage under certain circumstances, and the performance benefit of increasing the receiving antenna is often greater than that of increasing the transmitting antenna.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN919.3

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