| 摘要: |
| 基于数字地面电视广播(Digital Terrestrial Televisi
on Broa
dcasting，DTTB)同频直放站的回波干扰抑制，提出了一种变步长块LMS(Variable Step-siz
e Block Normalized Least Mean Square，VSSBNLMS)自适应算法。此算法的目的是为了提
高传统回波干扰抑制的自适应算法的收敛速度和降低计算复杂度。其将输入信号分为长度相
等的块，在每一个数据块内，权值向量只更新一次，有效地降低了计算复杂度。〖JP2〗另
外，该算
法通过输出误差控制更新步长的变化，与传统的归一化LMS (NLMS)和块LMS (BLMS)算法相比
，提高了收敛速度。仿真结果表明，该算法具有良好的收敛速度和回波干扰抑制性能。 |
| 关键词: 数字地面电视广播；同频直放站；回波干扰抑制 自适应滤波 变步长LMS算法 |
| DOI： |
|
| 基金项目: |
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| An improved adaptive feedback interference cancellation algorithm for digital on-channel repeaters |
| WANG Fei |
| () |
| Abstract: |
| A variable step-size block normalized least mean square (VSSBNLMS) algorithm is
derived to cancel the feedback interference in a Digital On-Channel Repeater (DO
CR) for the Digital Terrestrial Television Broadcasting (DTTB) networks. Its pur
pose is to improve the conventional adaptive algorithm′s convergence speed and
decrease the computational complexity for the feedback interference cancellation
. By dividing the input signal into blocks with the same length and updating the
tap weights once per every block, the computational complexity can be decreased
effectively. Furthermore, variable step-size is applied to increase the converg
ence speed. Compared with the NLMS and BLMS algorithms, VSSBNLMS algorithm achie
ves more rapid convergence. Simulations illustrate the computational complexity
is reduced and the echo interference cancellation performance is satisfying. |
| Key words: DTTB co-channel repeater echo inte
rference cancellation adaptive filtering VSSBNLMS algorithm |
《电讯技术》编辑部 