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本文分析了残余频偏对OFDM系统性能的影响,针对OFDM系统中常见的两种频率跟踪算法,比较了它们在加性高斯白噪声信道、SUI- 2和SUI- 5信道环境下的性能。仿真表明,采用计算相位旋转的频率跟踪算法比基于循环前缀的频率跟踪算法的估计精度高。在信道最大多径时延较循环前缀长度小时,两种算法对系统性能影响均较小;在信道最大多径时延接近循环前缀长度时,基于循环前缀的频率跟踪算法的估计误差的标准偏差通常超过子载波间隔的1 %,系统会有明显的信噪比损失
This paper analyzes the impact of residual frequency offsets on the performance of OFDM systems. Two frequency tracking algorithms commonly used in OFDM systems are compared and their performances in additive white Gaussian noise channels, SUI-2 and SUI-5 channels are compared. The simulation shows that the frequency tracking algorithm using phase rotation is more accurate than the frequency tracking algorithm based on cyclic prefix. When the channel maximum multipath delay is smaller than the cyclic prefix length, the impact of the two algorithms on the system performance is small. When the channel maximum multipath delay approaches the cyclic prefix length, the standard deviation of the estimation error of the frequency tracking algorithm based on the cyclic prefix Usually exceeds 1% of the sub-carrier interval, the system will have a significant loss of signal-to-noise ratio