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电子学报  2013 

高阶QAM调制下OFDM的载波与采样频偏联合纠正

DOI: 10.3969/j.issn.0372-2112.2013.03.011, PP. 481-487

Keywords: 高阶调制,正交频分复用,采样频偏,载波频偏,正交幅度调制

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Abstract:

采用高阶QAM(QuadratureAmplitudeModulation)调制的正交频分复用(OFDM,OrthogonalFrequency-DivisionMultiplexing)系统,相对于低阶调制来说,密集的星座点分布更容易受到载波频偏与采样频偏的影响.本文分析了高阶QAMOFDM系统对频率同步精度的要求,提出了一种载波与采样频偏联合纠正的方法,并分别针对时不变多径信道和块衰落多径Rician信道给出了频偏估计的均方误差解析表达式.均方误差的理论分析与计算机仿真结果吻合;误比特率性能仿真表明,频偏纠正后的误比特率性能与无频偏情况比较,差异小于1dB.

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