| 摘要: |
| 针对低信噪比短突发通信系统的载波恢复问题，研究了一种基于迭代思想的载波相
位估计算法。该算法首先利用导频进行初始的载波相位估计，然后再利用Turbo译码器输出
的软信息进行载波相位细估计，进而实现有效的载波同步。仿真结果表明，该算法仅利用11
个QPSK导频符号就能校正较大范围的相位偏移，进而达到理想的误比特性能。 |
| 关键词: 突发通信系统 Turbo码 载波同步 最大似然算法 训练序列 低信噪比 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目 (60902039, 61271175)；中央高校
基本科研业务费专项资金资助项目 (K50511010014) |
|
| Carrier synchronization technique based on Turbo iteration at low signal-to-noise ratios |
| XU Lin,WANG Xue-mei |
| () |
| Abstract: |
| To solve the problem of carrier recovery in short burst communication
system under the condition of low signal-to-noise ratio(SNR),an iterative carr
ier phase synchronization algorithm is researched in this paper. Firstly, the algorit
hm utilizes pilot symbols to estimate initial phase value based on maximum likel
ihood algorithm.Secondly, the soft-information of Turbo decoder is used to est
imate fine phase value, and then achieves efficient carrier synchronization. Sim
ulation results indicate that the algorithm can correct a larger range of phase
offset with only 11 QPSK pilot symbols so as to achieve optimal bit error proba
bility performance. |
| Key words: burst communication system Turbo codes carrier synchronization maximum-likelihood algorithm training sequence low SNR |
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