摘要
基于相关编码正交频分复用(OFDM)系统,提出了一种新的数据辅助载波频偏估计技术,利用相关编码OFDM系统的频域幅度特性估计载波频率偏移,增大了频偏估计的跟踪范围,同时采用改进的迭代估计剩余频偏方法,消除载波间干扰对频偏估计的影响,提高了估计精度.仿真结果表明,与传统的基于数据辅助频偏估计技术相比,该技术的跟踪估计范围增大为(-1,1),且在较高信噪比的估计均方误差明显降低.
A new data-aided carrier frequency offset (CFO) estimation algorithm was proposed for orthogonal frequency division multiplexing (OFDM) systems. The algorithm estimates CFO by exploiting the characteristics of correlative coded OFDM systems in the frequency domain, which increases the tracking range of CFO. Meanwhile, CFO estimation error caused by intercarrier interference is removed by using an improved iterative residual CFO estimation method. Simulation results show that the algorithm outperforms traditional data-aided estimation algorithms, the tracking range is increased to (-1, 1) and the variance of CFO estimate is visibly improved at higher signal to noise ratios.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2005年第4期429-432,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(90207012).
关键词
正交频分复用
载波频率偏移
载波间干扰
Carrier communication
Computer simulation
Frequency domain analysis
Monte Carlo methods
Parameter estimation
Signal to noise ratio
