Training symbol based coarse timing synchronization in OFDM systems
Training symbol based coarse timing synchronization in OFDM systems
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DOI：
10.1109/twc.2009.080356
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发表时间：
2009-05
影响因子：
10.4
通讯作者：
M. Ruan;Zhenning Shi;M. Reed
中科院分区：
文献类型：
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作者：
M. Ruan;Zhenning Shi;M. Reed
在正交频分复用（OFDM）系统中，可以从每个OFDM突发之前的一个或多个训练符号获取粗略帧定时。现有的文献研究的情况下，只有一个训练符号组成的相同的部分。我们推广的定时同步方法，以利用多个训练符号，只需要段是高度相关的，但不一定相同。我们构建了一系列的组件定时度量，每对高度相关的段，和联合收割机线性组合，以尽量减少虚警概率，同时保持渐近漏检概率到相同的水平，其他技术。下行链路突发中的OFDM数据符号可以具有不同的功率电平以到达不同距离处的用户。我们考虑到这一点，并产生更现实的结果比那些在现有的文献中只考虑了等功率的情况。所提出的方法的性能进行了分析，从IEEE 802.11和IEEE 802.16标准的三种情况下推广。数值结果证实了所提出的方法在各种信道条件下的鲁棒性。
In orthogonal frequency division multiplexing (OFDM) systems, coarse frame timing can be acquired from one or more training symbols preceding every OFDM burst. The existing literature studied the case where there was only one training symbol consisting of identical segments. We generalize the timing synchronization methods to take advantage of multiple training symbols and only require the segments to be highly correlated but not necessarily identical. We construct a series of component timing metrics, one for each pair of the highly correlated segments, and combine them linearly to minimize the false alarm probability while keeping the asymptotic missed detection probability to the same level as other techniques. The OFDM data symbols in a downlink burst can have different power levels to reach the users at different distances. We take that into account and yield more realistic results than those in existing literature which only considered the equal power case. The performance of the proposed method is analyzed in three scenarios generalized from the IEEE 802.11 and IEEE 802.16 standards. Numerical results are presented to confirm the robustness of the proposed method in various channel conditions.