【摘要】 对多径信道下的一种基于时域接收信号重构的正交频分复用系统频偏跟踪算法的跟踪范围进行了进一步的研究,发现这种算法的跟踪范围不是固定不变的.分析表明,影响时域接收信号重构准确性和跟踪范围的主要因素是判决误差,而子载波调制方式、子载波数目以及加性高斯白噪声和信道估计误差都对判决误差有影响,因而也都影响到跟踪范围.通过仿真,得出了子载波的调制方式和子载波的数目是影响频偏跟踪范围的主要因素的结论,并确定了子载波使用二进制调相和16QAM调制的情况下对应于不同子载波数目的频偏跟踪范围.更多还原

【Abstract】 The tracking range of a carrier frequency offset (CFO) tracking algorithm for orthogonal frequency division multiplexing (OFDM) systems based on time-domain received signal reconstruction was investigated deeply. It is found that the tracking range of this algorithm is not fixed. Analyses show the decision error is the main factor that affects the time-domain signal reconstruction accuracy and the tracking range, while the decision error is affected by subcarrier modulation scheme, subcarrier number, additive white Gaussin noise and channel estimate error, so dose the tracking range. We find that subcarrier modulation scheme and subcarrier number are main factors that affect the tracking range. The tracking range at different carrier numbers applying BPSK and 16QAM modulation scheme respectively on subcarriers are determined by simulation.更多还原