【摘要】：研究了光正交頻分復(fù)用(optical orthogonal frequency division multiplexing,OOFDM)系統(tǒng)中采樣時(shí)鐘同步問題,提出了一種基于訓(xùn)練序列互相關(guān)特性的易于硬件實(shí)現(xiàn)的采樣時(shí)鐘頻偏估計(jì)算法.算法的主要思想是對(duì)接收到的訓(xùn)練序列與本地已知訓(xùn)練序列作互相關(guān),利用該相關(guān)值周期性變化一次產(chǎn)生一個(gè)采樣點(diǎn)數(shù)差的特性,由少量加法器和一個(gè)除法器得到采樣時(shí)鐘頻率偏差(sampling clock frequency offset,SCFO)值.通過在一個(gè)強(qiáng)度調(diào)制直接檢測(cè)的光正交頻分復(fù)用(intensity-modulation and direct-detection-OFDM,IMDD-OFDM)系統(tǒng)上的實(shí)驗(yàn),驗(yàn)證了該算法具有較好的準(zhǔn)確度和抗噪性能.
[Abstract]:The problem of sampling clock synchronization in optical orthogonal frequency division multiplexing (OOFDM) (optical orthogonal frequency division multiplexing system is studied. A sampling clock frequency offset estimation algorithm based on the cross-correlation property of training sequence is proposed, which is easy to implement in hardware. The main idea of the algorithm is to correlate the received training sequence with the local known training sequence, and make use of the characteristic of the periodic variation of the correlation value to produce a sampling point difference at a time. The sampling clock frequency deviation (sampling clock frequency off set SCFO) is obtained from a few adder and a divider. Experiments on a intensity-modulation and direct-detection-OFDM IMDD-OFDM system for direct detection of intensity modulation show that the proposed algorithm has good accuracy and anti-noise performance.
【作者單位】： 上海大學(xué)特種光纖與光接入網(wǎng)省部共建重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61132004,61275073,61420106011) 上海市科委重點(diǎn)資助項(xiàng)目(13JC1402600,14511100100)
【分類號(hào)】：TN915.63

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