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为了保持移动中正交频分复用(OFDM)技术子载波间的正交性,避免载波间的干扰(ICI)引起的系统性能退化,建立了载波频率偏移(CFOs)的步长估计模型,对模型的稳定性、步长参数和CFOs的估计误差等进行研究,并进行了MATLAB仿真。VHDL程序在电路板上运行的实验结果表明:在±3σ估计变化区间内,移动速度为400和800 km/h时,CFOs的误差分别近似为0.010和0.017,符合CFOs估计误差必须精确的在子载波空间1~2%范围内的衡量标准,同时程序在电路板上能够正确执行。
In order to maintain the orthogonality among the subcarriers of Orthogonal Frequency Division Multiplexing (OFDM) and to avoid the degradation of system performance caused by inter-carrier interference (ICI), a step size estimation model of carrier frequency offset (CFOs) , The stability of the model, step parameters and CFOs estimation error are studied, and MATLAB simulation is carried out. The experimental results of VHDL running on the circuit board show that the error of CFOs are approximately 0.010 and 0.017 respectively when the moving speed is 400 and 800 km / h within the range of ± 3σ estimation, which is consistent with the CFOs estimation error must be accurate Carrier space 1 ~ 2% of the range of the standard, at the same time procedures in the circuit board can be correctly implemented.