本文選題：高速長(zhǎng)距離傳輸 + 相干光正交頻分復(fù)用��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：面對(duì)如今高速和長(zhǎng)距離的傳輸要求,相干光正交頻分復(fù)用(CO-OFDM)系統(tǒng)提供了一系列的解決方案。CO-OFDM的保護(hù)間隔(CP)可抑制光纖色散效應(yīng)引起的OFDM符號(hào)間干擾(ISI),但CP開(kāi)銷的增大會(huì)降低CO-OFDM頻譜利用率。通過(guò)在接收端插入一種重疊頻域均衡(OFDE)算法來(lái)補(bǔ)償色散,可以減小保護(hù)間隔、提高頻譜利用率,這種方案稱為減小保護(hù)間隔OFDM(RGI-OFDM),但這種重疊頻域均衡(OFDE)算法的復(fù)雜度很大。本文提出一種能有效平衡CO-OFDM頻譜利用率和RGI-OFDM系統(tǒng)復(fù)雜度間關(guān)系的新型方案,它是基于多相濾波器組的多子帶復(fù)用OFDM(SBD-OFDM)系統(tǒng)。該系統(tǒng)利用多相濾波器組將接收信號(hào)劃分成多個(gè)平行的子帶信號(hào),使得每個(gè)子帶信號(hào)具有速率低且頻譜相對(duì)平坦的特性,因此SBD-OFDM不需要額外的色散補(bǔ)償模塊,從而既能降低CP開(kāi)銷,又可以節(jié)省不必要的系統(tǒng)復(fù)雜度。本文研究的主要研究成果為以下兩個(gè)方面:一方面,基于多相濾波器組的多子帶復(fù)用系統(tǒng)設(shè)計(jì)。該系統(tǒng)主要由三個(gè)部分組成,子帶劃分、多子帶信號(hào)處理和多子帶信號(hào)合成接收。依據(jù)多相濾波器組的特性,將輸入信號(hào)劃分成M個(gè)相等帶寬的子帶,然后對(duì)M個(gè)子帶信號(hào)進(jìn)行簡(jiǎn)要的處理,得到M個(gè)平行的頻域子帶信號(hào),經(jīng)過(guò)合成后回復(fù)到傳統(tǒng)CO-OFDM所能接收的階段。整個(gè)方案的設(shè)計(jì)要點(diǎn)包括濾波器組的選擇、子帶數(shù)目M的判定、子帶信號(hào)FFT窗口的同步方法等等。另一方面,多子帶復(fù)用系統(tǒng)的實(shí)驗(yàn)驗(yàn)證。設(shè)計(jì)完成后,搭建實(shí)驗(yàn)來(lái)驗(yàn)證該系統(tǒng)的性能。首先,搭建一個(gè)傳統(tǒng)相干光正交頻分復(fù)用系統(tǒng),減小發(fā)送端CP,得到系統(tǒng)性能劣化的傳輸結(jié)果。分別將重疊頻域均衡算法(OFDE)和多子帶復(fù)用應(yīng)用到該系統(tǒng)的接收端,測(cè)試和對(duì)比CO-OFDM、RGI-OFDM和SBD-OFDM三個(gè)系統(tǒng)的傳輸性能和系統(tǒng)復(fù)雜度。由實(shí)驗(yàn)證明,本文提出的基于多相濾波器組的SBD-OFDM是一個(gè)高效的傳輸方案,只需要很低的系統(tǒng)復(fù)雜度就能實(shí)現(xiàn)同樣良好的傳輸性能。
[Abstract]:In the face of today's high-speed and long-distance transmission requirements, Coherent optical orthogonal frequency division multiplexing (CO-OFDM) system provides a series of solutions. The protection interval of CO-OFDM can suppress the inter-symbol interference caused by fiber dispersion, but the increase of CP overhead will reduce the spectrum efficiency of CO-OFDM. By inserting an overlapping frequency domain equalization (OFDE) algorithm into the receiver to compensate for dispersion, the protection interval can be reduced and the spectral efficiency can be improved. This scheme is called reducing the protection interval OFDMU RGI-OFDM, but the complexity of this overlapping frequency domain equalization algorithm is very large. In this paper, a novel scheme is proposed to effectively balance the relationship between the spectral efficiency of CO-OFDM and the complexity of RGI-OFDM systems. It is a multi-subband multiplexed OFDMS-OFDM system based on polyphase filter banks. The system uses polyphase filter banks to divide the received signals into a plurality of parallel sub-band signals, so that each sub-band signal has the characteristics of low rate and relatively flat spectrum, so SBD-OFDM does not require additional dispersion compensation modules. It can reduce CP overhead and save unnecessary system complexity. The main research results of this paper are as follows: one is the design of polysubband multiplexing system based on polyphase filter banks. The system consists of three parts, sub-band division, multi-sub-band signal processing and multi-sub-band signal synthesis reception. According to the characteristics of the polyphase filter bank, the input signal is divided into M sub-bands with equal bandwidth, then M sub-band signals are processed briefly, and M parallel frequency domain sub-band signals are obtained. After synthesis, it is returned to the stage which can be received by traditional CO-OFDM. The main design points of the scheme include the selection of filter banks, the determination of the number of sub-bands M, the synchronization method of FFT window of sub-band signals, and so on. On the other hand, the experimental verification of multi-subband multiplexing system. After the design is finished, an experiment is built to verify the performance of the system. Firstly, a traditional coherent optical orthogonal frequency division multiplexing system is built to reduce the CPS of the transmitter and obtain the transmission results of the system performance degradation. The overlapping frequency-domain equalization algorithm (OFDE) and multi-subband multiplexing (MBS) are applied to the receiver of the system. The transmission performance and system complexity of CO-OFDM RGI-OFDM and SBD-OFDM are tested and compared. Experimental results show that the proposed SBD-OFDM scheme based on polyphase filter banks is an efficient transmission scheme and can achieve the same good transmission performance with very low system complexity.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN713;TN929.11
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本文編號(hào)：1999509