| 摘要: |
| 针对数字电视地面多媒体广播（DTMB）接收机中多数传统载波恢
复算法估计范围较小，且没有考虑定时误差的影响，提出了一种粗偏调整结合扫频的低复杂
度载波恢复算法。该算法兼容不同的发送制式以降低接收端的实现复杂度。为了保证估计性
能，算法先利用PN的时域特性进行粗频偏调整，然后用变步长扫频估计剩余大频偏。理论分
析和计算机仿真表明：所提算法抗噪声、多径的能力较强，且对定时估计误差不敏感。 |
| 关键词: DTMB 载波恢复 扫频 |
| DOI： |
|
| 基金项目: |
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| A New Multi-mode Carrier Recovery Scheme for DTMB Receivers |
| SONG Hong-mei |
| (School of Communication Engineering, Nanjing Institute of Technology, Nanjing 2
11167,China) |
| Abstract: |
| For DTMB(Digital Television Terrestrial Multimedia Broadcasting) receivers, conv
entional carrier recovery algorithms may have limited estimation ability and hav
e not taken into account the impact of timing error. A low-complexity algorithm
combining coarse frequency offset adjusting and sweeping frequency is proposed,
which is compatible with different transmission modes to reduce the complexi
ty. To improve the performance, coarse frequency offset adjusting based on the t
ime-domain property of PN is adopted before a variable-step sweeping frequency i
s used to estimate the residual frequency offset. Both theoretical analysis and
computer simulation results show that the proposed algorithm is robust to noise,
multipath and timing error. |
| Key words: digital television terrestrial multimedia broadcasting
(DTMB) carrier recovery sweeping frequency |
《电讯技术》编辑部 