| 摘要: |
| 提出了一种新的正交频分复用(OFDM)系统定时和频率同步联合算法。该算法仅需要一
个训练符号就可以完成定时和频偏估计，额外开销量小，定时和频率同步的实现均在时域进
行，简化了同步实现的复杂度。由于使用自相关处理，定时同步对频率偏差具有较强的鲁棒
性。与以往的定时同步算法相比，该算法避免了定时平台和多峰值的出现，即使在非常低
的信噪比下，其定时测度都是一个尖脉冲。仿真结果表明，该算法能快速地实现定时和频率
同步。 |
| 关键词: 正交频分复用 定时估计 载波频率偏差估计 |
| DOI： |
|
| 基金项目:国家发改委项目 (CNGI-04-4-2) |
|
| A Novel Joint Estimation Algorithm of Timing and Carrier Frequency Offset |
|
| (Communication Engineering School, Chongqing University, Chongqing 400044, Chi
na;Chongqing Communication College, Chongqing 400035, China) |
| Abstract: |
| A novel joint estimation algorithm of timing and carrier frequency syn
chronization for orthogonal frequency division multiplexing (OFDM) systems is pr
esented. Only one training symbol is used for symbol timing and carrier frequenc
y offset estimation, the overhead is small. Timing synchronization and carrier f
requency synchronization are achieved in time domain, thus the complexity of syn
chronization is reduced. As autocorrelation is used, timing estimation is robust
against carrier frequency offset. Compared with the existing OFDM system timing
synchronization algorithms, the presented algorithm avoids the phenome
non of plateau or multpeak in timing metric. Even for very low singletonoise
ratio(SNR), a peak pulse can be present in timing metric while the presented al
gorithm is used. Simulations show that the algorithm can estimate the timing off
set and frequency offset quickly and exactly. |
| Key words: orthogonal frequency division multiplexing (OFDM) timing estimation carrier fre
quency offset estimation |
