重庆邮电大学学报（自然科学版）2017，Vol.29Issue(5)：611-617,7.DOI:10.3979/j.issn.1673-825X.2017.05.006
基于分数时延信道模型的低复杂度信道估计方法
Low complexity channel estimation method based on fractional delay channel model
摘要
Abstract
Due to the inherent sparse feature of the wireless channel in multi-carrier system,compressed sensing techniques are applied in the channel estimation of the OFDM system to improve spectrum utilization.However,the conventional timedomain sampling method causes the imprecision to the channel recovery dictionary,which can't accurately reflect the characteristics of the transmission channel path.To solve this problem,a multipath sparse fractional delay channel model is used to simulate the OFDM wireless multipath channel.In addition,a time-domain oversampling based generalized orthogonal matching pursuit (GOMP) algorithm at the receiver is exploited to improve the estimation accuracy and keep a relatively low computational complexity which is increased due to the time-domain oversampling.Simulation results demonstrate that the time-domain oversampling can effectively detect the fractional delay.In contrast to the conventional OMP algorithm,the GOMP algorithm reduces the computational complexity by 80％.Hence,it verifies the reliability and the validity of the proposed method in this paper.关键词
压缩感知/匹配追踪/分数时延/过采样Key words
compressed sensing/matching pursuit/fractional delay/oversampling分类
信息技术与安全科学引用本文复制引用
马子骥,彭强,周冰航,李元良,唐涛..基于分数时延信道模型的低复杂度信道估计方法[J].重庆邮电大学学报（自然科学版）,2017,29(5):611-617,7.基金项目
中央国有资本经营预算项目([2013]470号) （[2013]470号）
中央高校基本科研项目(2014-004) （2014-004）
国家自然科学基金(61540012) （61540012）
中国博士后科研基金(2014M562100) （2014M562100）
湖南省科技计划重点项目(2015JC3053) （2015JC3053）
教育部产学合作协同育人项目(201601004010)The Central State-Owned Capital Management and Budget Project ([2013] 470) （201601004010）
The Fundamental Research Funds for the Central Universities (2014-004) （2014-004）
The National Nature Science Foundation of China (61540012) （61540012）
The National Doctoral Fund of China (2014M562100) （2014M562100）
The Hunan Provincial Science and Technology Department Funds (2015JC3053) （2015JC3053）
The Ministry of Education Cooperative Education Project(201601004010) （201601004010）
