The invention discloses a WiMAX fast fading ICI elimination method based on planar extended Calman filtering. This method uses the cycle of short training sequence of WiMAX signal, the signal from the actual part, and the Doppler frequency plane extended Calman filter for WiMAX signal offset is estimated by iterative correction relationship and the real part of the imaginary part of the signal, the use of fast fading and eliminate the interference of ICI to WiMAX system. The method of the invention solves the defects of ICI interference in high speed mobile WiMAX system can not effectively eliminate the existing scheme, but also has high estimation precision, low complexity and no need to estimate the initial phase of signal offset etc..
【技术实现步骤摘要】
【技术保护点】
一种基于平面扩展卡尔曼滤波的WiMAX快衰落ICI消除方法,其特征在于利用WiMAX信号的循环短训练序列,对信号进行虚实部分离,并通过信号的虚部和实部的关系运用平面扩展卡尔曼滤波对WiMAX信号的多普勒频偏进行迭代修正估计,进而消除快衰落ICI对WiMAX系统的干扰,其操作步骤如下: (1)信源信息转变成待传输有效数据:将信源信息进行信源编码、加扰、信道编码、交织、串并S/P转换及调制映射后变成N个子载波上的待传输有效数据X↓[i]; (2)导频插入与数据复用:产F↓[m]为第m个信道抽头的FFT变换系数,W↓[i]为噪声的FFT变换; (7)多普勒频偏估计:利用WiMAX信号的循环短训练序列,对信号进行虚实部分离,并通过信号的虚部和实部的关系运用平面扩展卡尔曼滤波对WiMAX信号的多普勒频偏进行迭代修正估计,对接收信息进行ICI消除,得到数据码元Y′; (8)信道参数估计:对Y′的每个码元进行信道频域参数估计H′,设信道的时域响应为: h(n)=*h↓[i]e↑[j(2π/N)f↓[D↓[i]]Tn]δ(λ-τ↓[i]) 0≤n≤N-1, 其中, ...
【技术特征摘要】
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