本文選題：單頻網(wǎng) + 云傳輸�。� 參考：《清華大學(xué)學(xué)報(bào)(自然科學(xué)版)》2014年04期

【摘要】：在寬帶地面數(shù)字廣播領(lǐng)域,單頻網(wǎng)(single frequency network,SFN)由于具有更高的頻譜效率而逐漸替代多頻網(wǎng)(multi-frequency network,MFN)成為實(shí)際系統(tǒng)布網(wǎng)的首選。但隨著移動(dòng)業(yè)務(wù)的增長(zhǎng)、城市樓宇環(huán)境的日趨復(fù)雜,傳統(tǒng)SFN內(nèi)容單一、交疊區(qū)域信號(hào)衰減劇烈的弊端也限制著它的進(jìn)一步應(yīng)用。新近提出的云傳輸SFN由于簡(jiǎn)單的組網(wǎng)規(guī)范、靈活的傳輸體制以及更高的頻率復(fù)用率而引起廣泛的重視。云傳輸網(wǎng)絡(luò)負(fù)的信號(hào)接收門限保證了兩基站重疊區(qū)域強(qiáng)回波信道下系統(tǒng)的性能。該文針對(duì)云傳輸體制部署時(shí)面臨的多基站重疊的挑戰(zhàn),提出一種基于Walsh序列擴(kuò)頻的編碼方案,并分析了交疊區(qū)域以及疊加多業(yè)務(wù)后的系統(tǒng)性能,仿真表明:該方案在抗多徑和多業(yè)務(wù)傳輸方面符合云傳輸廣播網(wǎng)的組網(wǎng)要求,并有實(shí)現(xiàn)簡(jiǎn)單、兼容性好的特點(diǎn),可同時(shí)滿足下一代數(shù)字廣播網(wǎng)高清傳輸與支持移動(dòng)的需求,具有良好的應(yīng)用前景。
[Abstract]:In the field of broadband terrestrial digital broadcasting, single frequency network SFN (single frequency network) has gradually replaced multi-frequency network (MFN) as the first choice for practical system because of its higher spectral efficiency. However, with the growth of mobile services and the increasingly complex environment of urban buildings, the traditional SFN content is single and the overlapping region signal is decaying sharply, which also limits its further application. Recently proposed cloud transmission SFN has attracted wide attention due to its simple networking specification flexible transmission system and higher frequency reuse rate. The negative threshold of signal reception in cloud transmission networks ensures the performance of the system in strong echo channels where two base stations overlap. Aiming at the challenge of multi-base station overlap when cloud transmission system is deployed, this paper proposes a coding scheme based on Walsh sequence spread spectrum, and analyzes the system performance of overlapped region and superimposed multi-service. Simulation results show that the scheme meets the network requirements of cloud transmission network in anti-multipath and multi-service transmission, and has the characteristics of simple implementation and good compatibility. It can meet the needs of high-definition transmission and mobile support of the next generation digital broadcasting network. It has good application prospect.
【作者單位】： 清華大學(xué)電子工程系清華信息科學(xué)與技術(shù)國家實(shí)驗(yàn)室 北京數(shù)字電視國家工程實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(61271266) 國家“八六三”高技術(shù)項(xiàng)目(2012AA011704)
【分類號(hào)】：TN934.3

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8 李一兵,樓U，

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