cdma2000中基于分形滤波的信道估计方法

第三代移动通信标准cdma2000采用了基于平行连续导频信道辅助的信道估计体制.本文将分形理论引入多径衰落信道的描述,提出了一种利用分形滤波进行最小均方误差意义下信道参数估计的方法.仿真结果表明,本方法不仅对不同运动速度下的信道都能得到比较准确的估计,从而显著地改善Rake接收机的性能,而且可以自适应跟踪信道衰落的快慢变化.研究同时表明,与传统的随机模型相比,新的分形信道模型能更好地刻画多径衰落的行为.

Channel Estimation Based on Fractal Filter for cdma2000

Channel estimation using the parallel pilot channel in cdma2000 systems was investigated.The fractal theory was applied to describe multipath fading channels,and a novel channel estimation scheme using fractal filter in the sense of minimum mean square error (MMSE) was presented.It is demonstrated by computer simulations that the proposed method can estimate the channel parameters more accurately and track the changes of channel conditions self adaptively in both rapid and slow terminal moving cases.The performance of the Rake receiver is improved notably.The results also show that the fractal model can describe multipath fading more effectively compared to the conventional statistical models.