基于时频联合估计的短波OFDM的检测算法

阚春荣; 王庭昌

基于时频联合估计的短波OFDM的检测算法

阚春荣^{①;王庭昌},
王庭昌

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出版历程
- 收稿日期: 2003-12-29
- 修回日期: 2004-07-19
- 刊出日期: 2005-06-19

A Detection Algrithm Based on Joint Time and Frequency Offset Estimation for OFDM in HF Communications

Kan Chun-rong^{①;王庭昌},
Wang Ting-chang

摘要

摘要: 针对短波信道的特点,该文提出了一种OFDM同步检测方案。方案采用m序列调制导频符号,利用时频偏移联合估计得到m序列的相关峰来实现同步检测。该文理论分析了方案中判决门限区间的选取。蒙特卡罗仿真表明,该方案在低信噪比(-10dB)下性能良好,有可靠的同步概率和小的虚警概率。
- 正交频分复用（OFDM）; 检测; 低信噪比; 伪随机噪声（PN）序列
Abstract: Against the character of HF channels, this paper presents an OFDM synchronization detection scheme, which uses m sequence to modulate the pilot symbols. Based on joint time and frequency-offset estimation, synchronization detection can be implemented using the correlation peak of the m sequence in low SNR. Theoretical analysis shows the right selection of range for decision threshold. Monte Carlo simulation results show the scheme has good performance with a reliable detection probability and a low false alarm probability under low SNR( - 10dB).

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