传统的DFT信道估计算法复杂度比最小均方误差算法低,并且其性能比最小二乘算法好.但它只消除了循环前缀以外的噪声,对循环前缀以内的噪声并没有进行处理.鉴于该算法的不足,提出了一种混合载波调制下新的阈值DFT信道估计技术,即在循环前缀内设置了阈值,将大于阈值的数据保留,小于阈值的数据置为零,从而抑制循环前缀以内的噪声.仿真结果表明,与传统的DFT信道估计方法相比,提出的算法使循环前缀以内的噪声得到有效抑制,且在不同的调制参数下性能均得到优化.%Traditional DFT channel estimation algorithm has a lower complexity than the minimum mean square error algorithm,and provides a better performance than the least square algorithm.However,traditional DFT-based channel estimator just removes the noise in the channel impulse response (CIR) beyond the length of the cyclic prefix (CP),while the noise within the length of CP is not addressed at all.To overcome the deficiency of this algorithm,new threshold DFT channel estimation with hybrid carrier modulation technique is proposed.The threshold value is set within the cyclic prefix.It will retain the data greater than the threshold value,and set the data less than threshold value to zero.Thus it could suppress the noise within the length of CP.Simulation results demonstrate that the proposed algorithm can effectively suppress the noise within the cyclic prefix.And the performance is optimized under different modulation parameters.
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