摘要
针对正交频分复用/时分复用(OFDM/TDM)系统现有导频结构和信道估计算法缺乏对信道快衰落实时跟踪能力的问题,提出一种改进信道估计算法。该算法利用相邻2个时域复用导频序列对信道特性进行估计得到信道传递函数,通过内插处理获得数据符号的信道状态信息,并利用最小均方误差准则的频域均衡算法补偿信道衰落。仿真结果表明,与现有信道估计算法相比,在相同数据传输效率情况下,提出算法不仅能够适用于慢衰落信道,同时对快衰落信道的实时变化有良好的跟踪能力,改善系统性能。
For the shortage of tracking ability against fast fading channel of the existing pilot structures and channel estimation algorithms in OFDM combined with time division multiplexing（OFDM/TDM） system,an improved channel estimation algorithm is proposed.The channel transfer functions are obtained by estimating the channel properties with two adjacent time domain multiplexing（TDM） pilot sequences,while the channel state information of the OFDM/TDM symbols is obtained with interpolation Combined with frequency domain equalization based on minimum mean square error（MMSE-FDE）,the proposed algorithm can significantly compensate the path loss over fast fading channels.Simulation results show that,compared with the existing channel estimation algorithms,the proposed algorithm can achieve better performance,which is not only capable of dealing with slow fading channels,but also has a better tracking ability against fast fading channels with the same data transmission efficiency.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第2期64-68,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(60872038)
中国博士后基金资助项目(20090450787)
重庆市教委科技项目(KJ08A09)
国家'211工程'人才培养计划(S-09102)
