OFDMA系统上行链路频偏的盲估计

Blind estimation of frequency offset for OFDMA uplink

正交频分多址(OFDMA)系统同步问题的难点在于上行链路的频率同步,本文针对OFDMA系统上行链路,利用基于数据重构的music算法来提取接收信号的共轭自相关信息中所包含的用户频偏信息,不需要任何导频信号或训练序列的帮助。通过算法仿真,表明该算法可以有效的抵抗噪声和信号间干扰。

The real challenge of synchronization in OFDMA exists in the OFMDA uplink. For the OFDMA uplink, this paper, a blind estimation algorithm of frequency offset based on the improved music algorithm is presented, which use the conjugate autocorrelation of the received signal, and this blind algorithm can estimate the frequency offset of each user without the help of any pilot or training sequence. The performance of high resolution and immune to the effect of noise and interference is evaluated through the simulation results.