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电子学报  2015 

单通道高阶调制线性混合信号的频偏估计

DOI: 10.3969/j.issn.0372-2112.2015.01.025, PP. 160-165

Keywords: 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

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Abstract:

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-RaoBound,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.

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