摘要: |
本文详细论述了OFDM系统中循环前缀在削弱符号间干扰(ISI)、载波间干扰(ICI)以及在实现时频同步中的应用。在OFDM符号间插入循环前缀,可以减小ISI和ICI,并为实时时频偏移估计提供足够信息,使得系统同步结构简单且工作高效。 |
关键词: OFDM 移动通信 正交多载波调制 循环前缀 偏移估计 时频同步 |
DOI:10.3969/j.issn.1001-893X. |
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Appliation of Cyclic Prefix in OFDM Systems |
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Abstract: |
In this paper, the applications of cyclic prefix in the fields of weakening ISI and ICI and the realization of time-frequency synchronization in OFDM systems are discussed in detail. When the cyclic prefix is inserted into OFDM symbols, the ICI and ISI can be decreased, and the redundancy introduced by cyclic prefix can provide sufficient information for simultaneous estimation of time-frequency offset, thus making the system synchronization simple in structure and efficient in performance. |
Key words: Mobile communication,Orthogonal Frequency-Division Multiplexing(OFDM),Cyclic Prefix(CP),Offset estimation,Time-frequency synchronization |