摘要
基于块状导频的信道估计方法可以克服OFDM/OQAM(OFDM/Offset QAM)系统所固有的符号间和载波间干扰,从而成为该类系统通用的信道估计方法。该文基于块状导频结构和OFDM/OQAM的系统特点,分析了系统相邻子载波之间的相关性,并在此基础上提出一种改进的信道估计算法,通过计算相邻子载波的相关系数,在频域进行有效的加权运算来降低干扰和噪声对信道估计的影响。分析和仿真结果表明,该算法能够有效地提高传统算法的信道估计精度和系统性能。
Since preamble-based channel estimation method can overcome the intrinsic inter-symbol interference and inter-carrier interference in OFDM/Offset QAM（OFDM/OQAM） system,it becomes the commonly used structure in similar systems.In this paper,according to the pilot structure and the characteristic of OFDM/ OQAM signal,the correlation between the adjacent sub-carriers is analyzed,and in turn an improved channel estimation algorithm is proposed.Through calculating the correlation coefficient between the adjacent subcarriers,weighting operation is carried out in frequency domain to reduce the effect of interference and noise on channel estimation.Analysis and simulation results demonstrate that this algorithm can effectively improve both channel estimation accuracy and system performances of traditional ones.
出处
《电子与信息学报》
EI
CSCD
北大核心
2012年第2期427-432,共6页
Journal of Electronics & Information Technology
基金
东南大学移动通信国家重点实验室开放研究基金(2010D08)
中国瑞典国际科技合作项目(2008DFA11700)
国家部级基金和电子科技大学中央高校基本科研项目(ZYGX2010X003)资助课题
关键词
无线通信
正交频分复用
偏移正交幅度调制
信道估计
子载波相关性
Wireless communication
Orthogonal Frequency Division Multiplex（OFDM）
Offset QAM（OQAM）
Channel estimation
Subcarrier correlation
