Robust brute force and reduced complexity approaches for timing synchronization in IEEE 802.11a/g WLANs
Robust brute force and reduced complexity approaches for timing synchronization in IEEE 802.11a/g WLANs
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DOI：
10.1109/iwcmc.2013.6583755
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Leila Nasraoui;L. N. Atallah;M. Siala
中科院分区：
文献类型：
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作者：
Leila Nasraoui;L. N. Atallah;M. Siala
本文应用了最近提出的一种有效的技术，已进行有关OFDM系统中的定时同步，IEEE 802.11a/g标准。利用IEEE802.11a/g前导码短训练序列的结构特异性实现时间同步。两个版本的应用技术被认为是：一个单阶段的蛮力的方法，它进行差分相关排他，和两个阶段的复杂性降低的方法，包括粗和细阶段。粗同步采用滑动相关实现，其特点是计算量小，而细同步采用差分相关实现，其特点是计算量大，并带有粗时间估计。在两阶段方法中，滑动相关和差分相关的组合使用，在短时间间隔内进行，结果在整体上降低了复杂性的方法。仿真结果表明，在IEEE 802.11a/g规范下，这两种方法在AWGN和多径信道下都能实现精确的时间同步。此外，两阶段的版本有一个低的计算负荷，这使得它适合于突发IEEE 802.11a/g OFDM系统中的快速符号定时同步。
This paper applies a recently proposed efficient technique that has been conducted regarding timing synchronization in OFDM systems, to the IEEE 802.11a/g standards. The time synchronization is fulfilled using the structure specificity of the short training sequence of IEEE 802.11a/g preamble. Two versions of the applied technique are considered: a single-stage brute force approach, which carries differential correlation exclusively, and a two-stage reduced complexity approach comprising coarse and fine stages. The coarse synchronization is achieved using sliding correlation, characterized by its low computational load, whereas the fine synchronization is realized by differential correlation, characterized by its high computational load and carried around the coarse time estimate. In the two stage approach, the combined use of sliding correlation and differential correlation, carried for short interval, results in an overall reduced complexity approach. Simulation results show that, applied in the IEEE 802.11a/g norm, both of the considered approaches provide accurate time synchronization in the AWGN and multipath channels. Moreover, the two-stage version has a low computational load, which makes it suitable for fast symbol timing synchronization in bursty IEEE 802.11a/g OFDM systems.