摘要
提出一种基于数据依赖叠加训练序列的OFDM载波频偏估计方法。叠加训练序列的周期性使其DFT能量间隔分布在特定的频点上,为了减小信息序列对叠加训练序列的影响,引入数据依赖序列使信息序列DFT在这些特定频点上为零,利用这个特性可进行频偏估计,只有得到正确的频偏估计时,这些旋转后的信息序列在这些特定频点的能量才得到最小值。仿真表明,该方法在不降低传输速率的情况下,有着较好的频偏估计性能。
A novel method of carrier frequency offset （CFO） estimation in OFDM system based on minimizing the special frequency domain power of DDST is proposed. The superimposed training s DFT power lies in special frequency bins because it is periodic. In order to decrease the interference between information and the training sequence, a data-dependent sequence is introduced to ensure those DFT bins of information sequence is zero. So this characteristic is used to estimate the CFO. Only using the correct CFO to compensate the received signal, the power of special DFT bins of information sequence can reach the minimum. Simulation results show that this method can accurately estimate the CFO without reducing the transmission rate.
出处
《现代电子技术》
2010年第19期26-28,共3页
Modern Electronics Technique
