Robust early-late gate system for symbol timing recovery in MIMO-OFDM systems
Robust early-late gate system for symbol timing recovery in MIMO-OFDM systems
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DOI：
10.1109/wimob.2011.6085366
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
S. Younis;A. Al-Dweik;C. Tsimenidis;B. Sharif;A. Hazmi
中科院分区：
文献类型：
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作者：
S. Younis;A. Al-Dweik;C. Tsimenidis;B. Sharif;A. Hazmi
针对正交空时分组编码（OSTBC）多输入多输出（MIMO）正交频分复用（OFDM）常模星座系统，提出了一种鲁棒定时恢复方案。在该系统中，通过最小化一个STC块中相邻子载波之间的功率差或在连续STC块中具有相似索引的子载波之间的功率差来实现符号定时。所提出的技术是完全盲的，因为它不需要任何关于信道状态或传输数据的先验信息。利用早-晚门（ELG）结构有效地实现了所提出的定时恢复方案。通过蒙特卡罗仿真，评估了该系统在不同频率选择性条件下的衰落信道上的性能。仿真结果表明，即使在严重的频率选择性衰落信道中，该技术也能提供准确的符号时序，显著优于其他时序指标。
This paper presents a robust timing recovery scheme for orthogonal space-time block coding (OSTBC) multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with constant modulus constellation. In the proposed system, the symbol timing is achieved either by minimizing the power difference between adjacent subcarriers in one STC block or between subcarriers with similar indices in consecutive STC blocks. The proposed technique is totally blind because it does not require any prior information about the channel state or the transmitted data. The early-late gate (ELG) configuration is utilized to realize the proposed timing recovery scheme efficiently. Monte Carlo simulations are used to assess the performance of the two realizations of the proposed system over fading channels with different frequency-selectivity conditions. Simulation results demonstrated the superiority of the proposed technique to provide accurate symbol timing even in severe frequency-selective fading channels which remarkably outperforms other timing metrics.