摘要
OFDM具有抗频率选择性衰落、抗符号间干扰强、频谱利用率较高等优点,而被选用在高速无线通信系统中为其核心技术.OFDM系统的可靠信道估计是实现数据高速率传输的关键,针对OFDM信号结构的特点,通过直接分析循环前缀在信道卷积中的作用,利用循环前缀信号构造出一个高阶的循环Toeplitz矩阵,使用DFT运算代替矩阵求逆,大大降低计算复杂度,能快速、可靠的进行信道估计.
In high rate wireless communication system,OFDM is the core technology tor its ability to resist frequency selective fading and ISI. The reliable channel estimation is the key problem to transfer in high rate. After analyzing the OFDM signatstructure and the effect of CP involved in channel convolution, a high order cyclic Toeplitz matrix is constructed, and DFT step is used instead of matrix inversion computation.
出处
《湖南工程学院学报（自然科学版）》
2005年第4期53-55,80,共4页
Journal of Hunan Institute of Engineering(Natural Science Edition)
