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中南大学学报(自然科学版)

Journal of Central South University

第44卷    第9期    总第229期    2013年9月

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文章编号:1672-7207(2013)09-3707-06
一种快速收敛的航空信道载波恢复判决反馈盲均衡算法
陈强,杨霄鹏,达新宇,欧阳超

(空军工程大学 信息与导航学院,陕西 西安,710077)

摘 要: 通过研究超指数迭代判决反馈盲均衡结构有效克服多径效应影响。针对航空信道存在快速时变的多普勒特性,在判决反馈均衡器中引入数字锁相环,实现对载波相位旋转的纠正。利用归一化思想,构造新的快速收敛的误差函数,提出一种带二阶数字锁相环快速收敛载波恢复修正的超指数迭代判决反馈盲均衡算法。仿真结果表明:在低空宽带航空信道环境中,新算法可以很好地对旋转相位进行跟综和补偿,提高载波恢复性能,降低误码率,与常规的盲均衡算法相比,在收敛速度、稳健性和抗干扰能力等方面优势明显。

 

关键字: 航空通信;超指数;判决反馈;盲均衡;数字锁相环

A fast super-exponential iteration decision feedback blind equalization algorithm for carrier recovery of aeronautical channel
CHEN Qiang, YANG Xiaopeng, DA Xinyu, OUYANG Chao

Institute of Information and Navigation, Air Force Engineering University, Xi’an 710077, China

Abstract:A blind equalizer based on super-exponential iterative decision feedback structure was studied to efficiently combat the effects of multipath fading. For the time-varying Doppler aeronautical channels, a digital phase-locked loop was introduced in decision feedback equalization to correct the carrier phase rotation. A new fast convergence error function was constructed based on the idea of normalization and a fast carrier recovery modified blind equalization algorithm of super-exponential iterative decision feedback with second order digital phase-locked loop (FCRMSEI-DFE-DPLL2) was proposed. The simulation results show that the proposed algorithm may not only track and compensate phase rotation, but also improve the carrier recovery ability and reduce the bit error rate. The new algorithm has better advantage of convergence speed, robustness and anti-interference ability compared with several other blind equalization algorithms.

 

Key words: aeronautical communication; super-exponential; decision feedback; blind equalization; digital phase-locked loop

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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