摘要
在通信信道性能优化的研究中,信道估计是协作通信系统获得分集增益,提高系统数据传输性能的关键。为抑制噪声对无线信道的影响,提高信道估计精度,针对传统的离散傅里叶变换信道估计算法滤噪效果不够理想的问题,提出一种改进的离散傅里叶变换阈值滤噪信道估计算法,通过将LS信道估计的时域冲击响应限制在循环前缀长度内,并通过设置改进的阈值门限最大限度地滤除LS信道时域响应在循环前缀长度内的噪声,显著提高了信道估计精度。仿真结果表明:和现有的DFT阈值滤噪信道估计算法相比,在复杂度基本不变的前提下,改进算法可进一步改善协作通信系统的整体信道估计性能。
Channel estimation is crucial to obtain diversity gain and enhance the data transmission performance in cooperative communication system. In order to suppress the influence of noise in the wireless channel and to solve the insufficient ideal noise filtering in the traditional DFT channel estimation algorithm, an improved DFT channel esti- mation algorithm with threshold noise filtering is proposed. The algorithm significantly increases the estimation accu- racy through restricting the channel response estimated by LS to the length of GI and setting the improved threshold to maximumly suppress the noise in the length of GI. Simulation results show that, compared with the existing DFT threshold noise filtering algorithm, the improved algorithm can further improve the whole channel estimation perform- ance of cooperative communication system in condition of retaining the complexity.
出处
《计算机仿真》
CSCD
北大核心
2015年第8期217-220,270,共5页
Computer Simulation
基金
国家自然科学基金资助项目(61101167)
河南科技大学博士科研启动基金资助项目(09001409)
河南省科技攻关计划项目(112102210431)
