摘要
单载波频域均衡(SC-FDE)系统利用单抽头频域均衡补偿频率选择性衰落。该文提出了一种用于SC-FDE系统的二维最小均方误差(MMSE)信道估计算法。利用信道的时频分离特性,将二维估计简化为频域一维MMSE内插与时域一维MMSE滤波的级联。该算法对基于时域训练序列和基于频域训练序列的SC-FDE系统均适用。仿真表明,所提算法在两种训练序列条件下均优于传统的一维信道估计算法,且其性能与理想信道估计更接近。
Cyclic-prefix-based block processing is adopted in single-carrier frequency equalization（SC-FDE） system,which makes discrete channel estimation and equalization possible.A two-dimensional minimum mean square error（MMSE） channel estimation algorithm was developed for the SC-FDE system in this paper.With separation property of mobile wireless channels,the two-dimensional estimation can be simplified as an MMSE interpolation in the frequency domain cascaded by an MMSE filter in the time domain.The simplified algorithm is suitable to SC-FDE with unique word（UW）,i.e.UW-SC-FDE,as well as with pilot,i.e.Pilot-SC-FDE.Simulation results indicate that the algorithm is much superior to the one-dimensional channel estimation algorithm,for both UW-SC-FDE and Pilot-SC-FDE systems.The performance of the proposed algorithm gets close to that of ideal channel estimation.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第10期1680-1683,1689,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究发展规划项目(2007CB310601)
国家"八六三"高技术项目(2007AA01Z2b3)
清华信息科学与技术国家实验室(筹)资助项目
关键词
单载波频域均衡
二维信道估计
频域导频
single-carrier frequency equalization（SC-FDE）
two-dimensional channel estimation
frequency domain pilot
