數(shù)字電視單頻網(wǎng)技術(shù)研究

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摘 要

數(shù)字電視技術(shù)是近20年來發(fā)展最快的技術(shù)之一。我國的數(shù)字電視產(chǎn)業(yè)正在迅速發(fā)展，數(shù)字電視地面廣播呼聲日高，數(shù)字電視取代模擬電視的時(shí)代已經(jīng)到來。所謂數(shù)字電視就是將模擬電視信號(hào)經(jīng)取樣、量化和編碼后轉(zhuǎn)換成二進(jìn)制數(shù)表示的數(shù)字信號(hào)，然后進(jìn)行各種處理，如編碼、調(diào)制、傳輸、存儲(chǔ)等。數(shù)字電視之所以會(huì)大規(guī)模的流行，并逐步取代模擬電視，是因?yàn)樵诋?dāng)今許多的城市及周邊地區(qū)，容易受到眾多高層建筑物多徑干擾的影響，使接收效果惡化，如果想靠增加發(fā)射機(jī)的功率和天線的高度來解決此問題將是很不經(jīng)濟(jì)的、也是不現(xiàn)實(shí)的。而單頻網(wǎng)就是相鄰發(fā)射臺(tái)用同一個(gè)頻道發(fā)送同一個(gè)節(jié)目，這樣就很好地解決了接收問題。單頻網(wǎng)的優(yōu)點(diǎn)是：（1）節(jié)省頻率資源；（2）覆蓋范圍大。它是通過采用類似于蜂窩網(wǎng)的方式，以增加覆蓋范圍。
論文在查閱了大量有關(guān)文獻(xiàn)資料的基礎(chǔ)上，針對當(dāng)前數(shù)字電視的發(fā)展情況以及單頻網(wǎng)技術(shù)的發(fā)展，做了一定的研究，并對其進(jìn)行了仿真分析。論文中對MATLAB仿真環(huán)境方面的知識(shí)進(jìn)行了簡單介紹。

關(guān)鍵詞：數(shù)字電視，地面廣播傳輸標(biāo)準(zhǔn)，單頻網(wǎng)

ABSTRACT

The technology of the digital TV is one of the technology with the fastest developing speed in the past 20 years. The digital TV Industry of our country is developing rapidly, Broadcast in digital television ground voice loudly, the era of replacing the analogue TV of the digital TV has already come. The so-called digital TV changes the anolog TV signals into the digital signal that a binary number show through taking a sample, quantizing and encoding, then go on various kinds of treatment, code for instance , modulate , transmit , store. The prevalence that the digital TV will be extensive , and replace the analogue TV progressively , because in nowadays a lot of cities and surrounding area, easy to influence by the fact that it is interfered directly that there are many numerous high level buildings, make reception worsen, is it is it increase power and height of aerial of transmitter solve problem this very uneconomical , unrealistic too to lean against to want. And the network is that the adjoint launching stand sends the same program with the same channel frequently only, well solve the problem of receiving like this. The advantage of the network is frequently only: (1) Save frequency resources; (2)The coverage is big. It is by way of adopting and is similar to the honeycomb network, in order to increase the coverage.
The thesis is directed against the development of the present digital TV and development of the technology of the network frequently only on the basis of consulting generously and about documents and materials, have done certain research, and has carried on emulation analysis to it. Have carried on the simple introduction to MATLAB artificial environment knowledge in the thesis.
Key words：Digital TV; DVB-T; SFN

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