The correlation properties of pn sequence are widely used for synchronization in conventional cdma systems, and corresponding synchronization algorithms are very mature by now, so a new synchronization technique based on the correlating properties of pn sequence is discussed in this paper, in which synchronization may be performed after ofdm deframe and before fft conversion in order to make full use of transmitted cdma signal structure 本論文針對基于pn序列的相關(guān)特性深入地討論了mc-cdma移動通信系統(tǒng)的同步捕獲技術(shù),對同步捕獲的原理和方法作了較為深入的研究,詳細分析其捕獲方案,推導出它的主要性能指標并進行分析。
Meanwhile, the synchronization algorithm in the ds-ss system can be used in 2d-ss system, and good synchronization performance can be obtained, with its algorithm simplified . the third part analyzed the ber performance of mc-ss-cldd in the presence of multi-user interference in time-varying multipath fading channels 在論文的第三部分中,研究了多用戶多載波頻域擴頻碼片級差分檢測方案:從理論上分析了頻率選擇性衰落信道下該算法的誤碼率性能,同時進行了仿真驗證。
Following a review of the general algorithm and theory of clock synchronization, the measurement of network delay is carried out and a kind of modeling method based on log-normal distribution is put forwarded to describe its probabilistic distribution . with this, two clock synchronization methods based on probabilistic synchronization algorithm and statistical synchronization algorithms are proposed, and a new computer simulation method is proposed to test the effectiveness of these two synchronization methods 首先討論了軟件時鐘同步的基本原理與算法;然后進行了網(wǎng)絡(luò)傳輸延遲的測量及其概率分布的估計;最后提出了一種基于概率同步算法及基于統(tǒng)計同步算法的融合系統(tǒng)外同步方法及對其有效性進行驗證的計算機仿真方法。
Following a review of the general algorithm and theory of clock synchronization, the measurement of network delay is carried out and a kind of modeling method based on log-normal distribution is put forwarded to describe its probabilistic distribution . with this, two clock synchronization methods based on probabilistic synchronization algorithm and statistical synchronization algorithms are proposed, and a new computer simulation method is proposed to test the effectiveness of these two synchronization methods 首先討論了軟件時鐘同步的基本原理與算法;然后進行了網(wǎng)絡(luò)傳輸延遲的測量及其概率分布的估計;最后提出了一種基于概率同步算法及基于統(tǒng)計同步算法的融合系統(tǒng)外同步方法及對其有效性進行驗證的計算機仿真方法。