【摘要】 提出了一种基于单训练符号的用于多输入多输出-正交频分复用(MIMO OFDM)系统的时频同步算法。该算法利用移相脉冲码的自相关特性构造用于同步和大数频偏估计的训练序列,并通过引入逆向搜索窗以及门限的概念,解决了多径衰落信道中第1径不是最强径时,滞后的FFT窗定时导致的符号间干扰影响系统性能的问题。仿真结果表明,本算法不仅时频率估计精度高、频偏估计范围大,而且具有较快的同步收敛速度。更多还原

【Abstract】 A robust and efficient scheme based on only one training symbol for frame/symbol timing and carrier frequency synchronization in multiple-input multiple-output(MIMO)orthogonal frequency division multiplexing(OFDM)systems is proposed.The timing synchronization and integral frequency offset are accomplished by using the good correlation properties of training sequence constituted by phase shift pulse codes.Moreover,search window and threshold are introduced to solve the problem of timing synchronization with error away from cyclic prefix in multi-path fading channel where the first path is not the strongest one.Computer simulations show that the proposed method offers reliable timing and frequency accuracy,very wide frequency acquisition range and achieves faster synchronization convergence.更多还原