本文選題：DVB-NGH + 非規(guī)則星座��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著無線通信技術(shù)的高速發(fā)展,數(shù)字移動通信已成為未來通信發(fā)展的主流趨勢,另外,用戶對移動多媒體業(yè)務(wù)需求的急劇增長,使得數(shù)字視頻廣播具有非常廣泛的應(yīng)用前景。目前,基于第二代數(shù)字地面視頻傳輸標(biāo)準(zhǔn)DVB-T2(Digital Video Broadcasting:2nd Generation Terrestrial)的下一代手持終端演進標(biāo)準(zhǔn)DVB-NGH(Digital Video Broadcasting:Next Generation Handheld)已成為業(yè)內(nèi)正在研究的一個熱點。DVB-NGH是第一個引入了MIMO(Multiple Input Multiple Output,多輸入多輸出)天線機制的廣播系統(tǒng),與以往標(biāo)準(zhǔn)相比,DVB-NGH將在網(wǎng)絡(luò)承載能力方面有很大提高。盡管DVB-NGH還未正式標(biāo)準(zhǔn)化,但隨著新技術(shù)的不斷引入以及市場需求的強大驅(qū)動,DVB-NGH必然會對便攜/手持終端的多媒體業(yè)務(wù)起到巨大的推動作用。本文對DVB-NGH系統(tǒng)部分關(guān)鍵技術(shù)進行了詳細(xì)研究,所取得的主要研究成果為:1.在廣泛總結(jié)國內(nèi)外移動多媒體廣播技術(shù)背景和最新進展的前提下,論文詳細(xì)介紹了研究DVB-NGH系統(tǒng)的背景和意義,并著重分析了DVB-NGH規(guī)范計劃引入的一些新的性能增強技術(shù)。主要包括:比特交織編碼調(diào)制、時頻分片技術(shù)、邏輯組幀與未來擴展幀捆綁、物理層信令、單頻網(wǎng)絡(luò)中的本地業(yè)務(wù)插入技術(shù)以及增強的單頻網(wǎng)絡(luò)MISO機制等。除此之外,還簡單介紹了DVB-NGH MIMO規(guī)范所采用的關(guān)鍵技術(shù)及其實現(xiàn)框架。2.研究了DVB-NGH系統(tǒng)中可提高分集增益的非規(guī)則星座和四維旋轉(zhuǎn)星座。非規(guī)則星座主要包括非規(guī)則64-QAM與非規(guī)則256-QAM,其基本原理是使得原有的規(guī)則星座準(zhǔn)高斯化,以期能夠縮小規(guī)則星座容量限與香農(nóng)容量限之間的差距。在AWGN信道下,非規(guī)則64-QAM的平均誤比特率BER(Bit Error Ratio)相比于64-QAM有最大0.5dB的性能提升,非規(guī)則256-QAM相比于256-QAM在不同碼率下具有0.4dB到0.9dB的性能增益。四維旋轉(zhuǎn)是將一個符號在四維尺度上進行拓展,使得符號整體經(jīng)歷深衰落的概率大大降低。本文針對四維旋轉(zhuǎn)提出了一種新的解調(diào)方法,該方法基于MAP(Maximum A Posteriori,最大后驗)算法,并利用聯(lián)合概率求解軟信息。仿真表明,在瑞利衰落信道下,當(dāng)LDPC(Low Density Parity Check,低密度校驗碼)譯碼前誤碼率為10-3時,四維旋轉(zhuǎn)QPSK相比于二維旋轉(zhuǎn)大約有4dB的性能改善,相比于無旋轉(zhuǎn)星座性能提高了大約14dB。LDPC譯碼后的性能在高碼率時能夠提供0.5~0.6dB的增益,在低碼率時幾乎無增益,同時為了避免過多地增加接收端復(fù)雜度,DVB-NGH僅在碼率高于8/15時對QPSK調(diào)制采用四維旋轉(zhuǎn)。3.對本地節(jié)目插入技術(shù)的研究。在分析了DVB-NGH中的兩種本地節(jié)目插入方法——分層本地業(yè)務(wù)插入技術(shù)(H-LSI)和正交本地業(yè)務(wù)插入技術(shù)(O-LSI)的基礎(chǔ)上,本文提出了一種新的本地節(jié)目插入方法,該方法基于協(xié)同Alamouti編碼方案和唯一可分解星座對技術(shù),利用對全局信號進行旋轉(zhuǎn)的方式來插入本地業(yè)務(wù)。接收端采用一種聯(lián)合解調(diào)方法,即在旋轉(zhuǎn)與不旋轉(zhuǎn)兩種情況下對接收信號進行最大似然檢測并比較兩情況下的歐氏距離來估計插入的本地信號。該方法無需增加額外的時間或頻率資源就可以提高信道利用率,尤其在高信噪比條件下,相比于無本地業(yè)務(wù)插入系統(tǒng)其資源利用率提高了0.5bpcu。4.對DVB-NGH MIMO規(guī)范進行了研究。DVB-NGH是第一個引入了MIMO機制的廣播系統(tǒng)。對于DVB-NGH MIMO的實現(xiàn),發(fā)送端主要采用了增強空間復(fù)用技術(shù)加相位跳變技術(shù),接收端可根據(jù)具體要求采取不同的檢測方法。本文簡要介紹了幾種可選的MIMO檢測方法,分析了各個方法的實現(xiàn)復(fù)雜度,并選擇迫零檢測方法與采用相同檢測方法的SISO系統(tǒng)與MISO系統(tǒng)的性能做了相應(yīng)的仿真對比。同時就MIMO預(yù)編碼相關(guān)參數(shù)對性能的影響也做了相應(yīng)仿真。結(jié)果表明,在相同的頻譜利用率條件下,相比于MISO和SISO機制,MIMO能夠提供更高的性能增益。
[Abstract]:With the rapid development of wireless communication technology, digital mobile communication has become the mainstream trend of future communication development. In addition, the rapid growth of users' demand for mobile multimedia services makes digital video broadcasting have a very wide application prospect. At present, the standard DVB-T2 (Digital Video Broadcas) is based on the ground video transmission standard of second algebra words. Ting:2nd Generation Terrestrial) the next generation of handheld terminal evolution standard DVB-NGH (Digital Video Broadcasting:Next Generation Handheld) has become a hot spot in the industry, and.DVB-NGH is the first broadcast system introduced into the antenna mechanism of MIMO (Multiple), multiple input and multiple output (multiple input and multiple output), and the previous standards In contrast, DVB-NGH will greatly improve the capacity of the network. Although DVB-NGH is not formally standardized, with the continuous introduction of new technology and the strong drive of market demand, DVB-NGH will inevitably play a great role in promoting the multimedia services of portable / handheld terminals. This article has made a detailed study of some key technologies of the DVB-NGH system. The main achievements of the research are as follows: 1. the background and significance of the study of DVB-NGH system are introduced in detail, and some new performance enhancement techniques introduced by the DVB-NGH specification plan are analyzed in detail. Modulation, time frequency division, logical group frame and future extended frame binding, physical layer signaling, local service insertion in single frequency network and enhanced single frequency network MISO mechanism. Besides, it also briefly introduces the key technologies used by the DVB-NGH MIMO specification and its actual framework.2. to improve diversity and increase in the DVB-NGH system. Non regular constellations and four-dimensional rotation constellations. Irregular constellations mainly include irregular 64-QAM and irregular 256-QAM. The basic principle is to make the original rule constellation quasi Gauss, in order to reduce the gap between the rule constellation capacity limit and the Shannon capacity limit. Under the AWGN channel, the average bit error rate BER (Bit Er) of the irregular 64-QAM (Bit Er) Ror Ratio) has the maximum performance enhancement of 0.5dB compared to 64-QAM, and the irregular 256-QAM has the performance gain of 0.4dB to 0.9dB at different bit rates compared to 256-QAM. The four-dimensional rotation is to extend a symbol on the four-dimensional scale, which greatly reduces the probability of the symbol overall experience deep fading. This paper presents a new kind of new type of rotation for the four-dimensional rotation. The method is based on the MAP (Maximum A Posteriori, maximum posteriori) algorithm, and the joint probability is used to solve soft information. The simulation shows that in the Rayleigh fading channel, when the error rate of the LDPC (Low Density Parity Check, low density parity check code) before the decoding is 10-3, the four-dimensional rotation QPSK has approximately 4dB performance improvement compared to the two-dimensional rotation. Compared with the performance of non rotation constellation, the performance of about 14dB.LDPC decoding can provide 0.5~0.6dB gain at high bit rate, almost no gain at low bit rate, and in order to avoid excessive increase in receiver complexity, DVB-NGH only uses four dimensional rotation.3. for QPSK modulation for local program insertion technology when the bit rate is higher than 8/15. In this paper, based on the analysis of two local program insertion methods in DVB-NGH - layered local service insertion (H-LSI) and orthogonal local service insertion (O-LSI), a new method of local program insertion is proposed. This method is based on a cooperative Alamouti coding scheme and unique decomposable constellation. The local signal is inserted in a way of rotation. The receiver uses a joint demodulation method, that is, the maximum likelihood detection of the received signal in two cases of rotation and non rotation, and the Euclidean distance in the two case to estimate the inserted local signal. This method does not require additional time or frequency resources to be added. Improving the utilization of channel, especially in high signal to noise ratio, compared with the resource utilization of non local service insertion system, 0.5bpcu.4. has improved the DVB-NGH MIMO specification..DVB-NGH is the first broadcast system introducing MIMO mechanism. For the implementation of DVB-NGH MIMO, the sending end mainly uses enhanced space multiplexing technology. The receiver can take different detection methods according to specific requirements. This paper briefly introduces several optional MIMO detection methods, analyzes the complexity of the implementation of each method, and chooses the zero forcing detection method to compare the performance of the SISO system with the MISO system with the same detection method. At the same time, MIMO The effects of precoding parameters on performance are also simulated. The results show that, under the same spectrum utilization conditions, compared with the MISO and SISO mechanisms, MIMO can provide higher performance gain.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN934

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