电子学报 ›› 2015, Vol. 43 ›› Issue (1): 160-165.DOI: 10.3969/j.issn.0372-2112.2015.01.025

• 科研通信 • 上一篇    下一篇

单通道高阶调制线性混合信号的频偏估计

杨勇1, 张冬玲1, 彭华1, 涂世龙2   

  1. 1. 解放军信息工程大学信息系统工程学院, 河南 郑州 450002;
    2. 信号盲处理国家重点实验室, 四川 成都 610041
  • 收稿日期:2012-10-31 修回日期:2014-06-22 出版日期:2015-01-25 发布日期:2015-01-25
  • 作者简介:杨勇 男, 1988年生于云南, 现为解放军信息工程大学在读博士研究生.研究方向为盲信号处理, 信道编译码技术等.E-mail:yangyong328@163.com;张冬玲 女, 1976年生于江苏, 副教授, 主要研究方向为盲信号处理, 信道编译码技术等;彭华 男, 1973年生于江西, 教授, 博士生导师, 主要研究方向为软件无线电, 通信信号处理等.
  • 基金资助:

    国防基金(No.9140C860103120C8601);国家自然科学基金(No.61401511)

Frequency Offset Estimation in Single-Channel Linear Mixture of High-Order Modulated Signals

YANG Yong1, ZHANG Dong-ling1, PENG Hua1, TU Shi-long2   

  1. 1. College of Information System Engineering, PLA Information Engineering University, Zhengzhou, Henan 450002, China;
    2. National Key Lab on Blind Signals Processing, Chengdu, Sichuan 610041, China
  • Received:2012-10-31 Revised:2014-06-22 Online:2015-01-25 Published:2015-01-25

摘要:

针对具有固定帧长和固定帧同步序列的单通道高阶调制线性混合信号,当两路信号编码异步时,在已知帧长的条件下提出一种基于最大似然准则的频偏估计算法,并给出了算法的有效频偏估计范围.算法通过求互相关获得目标函数,并利用分级搜索的方法估计频偏.为对算法的性能进行评价,文中同时推导了混合信号频偏估计的克拉美罗界(Cramer-Rao Bound,CRB).仿真结果表明,算法在低Eb/N0下可获得接近CRB的估计性能.此外,算法还适用于功率非对称的混合信号.

关键词: 单通道混合信号, 高阶调制, 频偏估计, 最大似然估计, 克拉美罗界

Abstract:

For single-channel linear mixture of high-order modulated signals which have the fixed frame length and sync code,a frequency offset estimation(FOE) algorithmbased on the maximum likelihood criterion is proposed when the two signals are coded asynchronously,and the effective range of FOE is given.FOE is calculated byoptimising the objective function,which is obtained from cross-correlation computation,and the optimised process is accomplished by utilising hierarchical search.To evaluate the performance of the proposed algorithm,Cramer-Rao Bound (CRB)of mixed-signal FOE is derived.Simulation results show that,the estimation performance of the algorithm can come close to CRB performance with low Eb/N0.The proposed algorithm is also applied to the FOE of a mixed signal whose power is asymmetrical.

Key words: single-channel mixed signals, high-order modulation, frequency offset estimation, maximum likelihood estimation, Cramer-Rao Bound

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