摘要
针对固定波形时间保护间隔MIMO-OFDM系统信号构成的特点,本文提出了一种利用系统中周期出现的两种伪随机序列(PN和pn)相互配合以完成信道估计和跟踪的算法。通过巧妙的设计,固定时间保护间隔之间满足了Alamouti空时码的关系,这给信道估计、跟踪和噪声抑制带来了较大的增益。理论分析和计算机仿真结果表明,在相邻两个OFDM符号的信道特性变化较小环境中,该算法能够很好的对信道状态信息(CSI)进行估计和跟踪,实现MIMO-OFDM系统的信道均衡。
In this paper, according to the structure of signal in MIMO-OFDM System with fixed waveform Time Guard Interval （TGI）, we proposed channel estimation and tracking algorithm, which is based on two kinds of periodic Pseudo-Noise （PN） sequences. By theoretical analysis and computer simulation, it has been shown that this algorithm is effective on channel estimation channel tracking and equalization, when the channel doesn＇ t change fast between two adjacent MIMO-OFDM symbols.
出处
《信号处理》
CSCD
北大核心
2007年第2期293-297,共5页
Journal of Signal Processing
