数字电视广播信道估计算法的改进

Improved Algorithm for Digital Television Channel Estimation

  • 摘要: 对数字电视地面广播国家标准(DTMB)中单载波传输模式的信道估计算法提出一种改进方案。在研究了DTMB单载波传输模式的帧结构、系统接收处理流程的基础上,探讨了现有的基于PN序列滑动互相关的信道估计算法中存在的不足之处;并根据DTMB单载波传输模式帧头PN序列的特殊性对不足之处提出了改进方案。仿真表明,当信噪比大于20 dB时,改进后的算法明显优于未改进的常规算法。

     

    Abstract: In this paper, an improved algorithm is proposed for the single-carrier transport mode channel in digital television terrestrial multimedia broadcasting (DTMB) Standard. Based on the research to the DTMB single-carrier transport mode frame structure and the process of receiving-processing system, the shortage in the current algorithms for the channel estimation on the PN sequence moving correlation is indicated. According to the results of simulation, it is shown that the improved algorithm is better than the common one when the signal to noise ratio (SNR) is greater 20 dB.

     

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