关键词: 正交频分复用系统, 载波频率偏移, 频偏跟踪

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 re construction 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.

Key words: OFDM systems, carrier frequency offset, tracking