学术论文

      一种基于DFT变换的多径信道估计改进算法

      An improved algorithm of DFT-based channel estimation on multipath channel

      摘要:
      根据LTE(长期演进)系统下行链路的要求,结合硬件实现的实用性分析传统的信道估计算法,对信道估计中噪声区间不连续的情况、DFT(离散傅里叶变换)运算造成的频谱泄露问题、循环前缀长度内噪声不易消除等提出一种通过频域加窗,对噪声进行估计修正和对循环前缀内的信号进行滤波的方法对算法进行改进.通过对算法进行仿真,结果表明在增加少量算法复杂度上,提高了算法的准确性,提高系统的性能,适合于硬件的实现.
      Abstract:
      According to the requirements of LTE downlink system and the practicability of the traditional channel estimation algorithm combined with hardware implementation,considering non-successive noise interval,spectrum leakage based on DFT algorithm and noise within the cyclic prefix can not be removed accurately,an improved DFT-based estimation algorithm is proposed by data windowing in frequency domain,correcting the estimation of the noise,and filtering the signal within the cyclic prefix.By the simulation of the improved algorithm,the results show that the applicability of hardware implementation,the accuracy of the algorithm and the performance of the system is improved in case of increasing small amount complexity of the algorithm.
      作者: 王景隆 王建新
      Author: WANG Jing-long WANG Jian-xin
      作者单位: 武汉邮电科学研究院,武汉,430074
      刊 名: 信息技术 ISTIC
      年,卷(期): 2017, (3)
      分类号: TN911.23
      在线出版日期: 2017年4月18日