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 本论文针对基于pn序列的相关特性深入地讨论了mc-cdma移动通信系统的同步捕获技术,对同步捕获的原理和方法作了较为深入的研究,详细分析其捕获方案,推导出它的主要性能指标并进行分析。
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 在论文的第三部分中,研究了多用户多载波频域扩频码片级差分检测方案:从理论上分析了频率选择性衰落信道下该算法的误码率性能,同时进行了仿真验证。
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 首先讨论了软件时钟同步的基本原理与算法;然后进行了网络传输延迟的测量及其概率分布的估计;最后提出了一种基于概率同步算法及基于统计同步算法的融合系统外同步方法及对其有效性进行验证的计算机仿真方法。
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 首先讨论了软件时钟同步的基本原理与算法;然后进行了网络传输延迟的测量及其概率分布的估计;最后提出了一种基于概率同步算法及基于统计同步算法的融合系统外同步方法及对其有效性进行验证的计算机仿真方法。