移动WiMAX系统同频干扰抑制导频优化设计方法

Pilot Design for Co-channel Interference Suppression in Mobile WiMAX System

针对移动WiMAX系统下行传输,提出了一种抑制同频干扰的导频优化设计方法.将移动WiMAX系统原有时频二维离散分布的导频序列,经过相位旋转后生成新的正交导频序列,然后将该序列插入原有的导频位置.接收端在时域利用正交导频序列的移位正交特性,将干扰与信号信道响应分离,进而抑制同频干扰.仿真和分析表明,该方法具有较低计算复杂度,对移动速度影响较为鲁棒,可有效抑制同频干扰对导频的影响.

A pilot arrangement scheme aiming at suppressing co-channel interference was designed for the downlink of mobile WiMAX system. The new orthogonal pilot sequence is a phase rotated version of the one in WiMAX which is on a time-frequency grid. Since the pilot sequence is circular shift orthogonal, the receiver can separates the interference from the signal in time domain. The theoretical analysis and simulation show that the algorithm is able to effectively mitigate the co-channel interference and improves the performance of channel estimation, also has low complexity and robustness to velocity.