| 摘要: |
| 针对宽带短波通信正交频分复用（OFDM）系统，提出了一种不需要数据辅助的高效符号定时同步方法。该方法利用OFDM符号中的空载波不传输任何数据这一特性，通过最小化空载波上的数据能量来将符号定时点锁定在安全区域内，从而完成符号定时同步。该方法可以有效对抗多径效应，适用于短波通信系统。最后将该方法与Al-Dweik同步方案在宽带短波信道条件下进行了仿真对比，结果表明该方法有着更精确的符号定时同步性能，并且适用于各种星座图调制。 |
| 关键词: 正交频分复用 短波通信 符号定时同步 多径效应 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(61201177) |
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| A new symbol timing synchronization scheme for OFDM systems in HF communication |
| JIANG Yong,XU Wei-yang |
| () |
| Abstract: |
| An efficient non-data-aided(NDA) symbol timing synchronization approach is proposed for orthogonal frequency division multiplexing(OFDM) systems in wideband shortwave or high frequency(HF) communication. Based on the property that null subcarriers carry no data, this method can lock the timing point into the safe region through minimizing the power of signals in null subcarriers, thus achieving symbol timing synchronization. It can effectively combat the multipath effects which is desirable for HF communication. Simulation results confirm that compared with the Al-Dweik’s scheme, the proposed approach yields a better synchronization performance and is applicable to various signalling constellations over wideband HF communication channels. |
| Key words: orthogonal frequency division multiplexing HF communication symbol timing synchronization multipath effect |
《电讯技术》编辑部 