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研究了天线分集OFDM系统的高速无线数据传输特点,通过计算信道冲击响应与参考信号的相关函数,提出了一种增强型的信道估计方法。理论分析与计算机仿真表明,该方法能够有效地降低加性噪声对信道估计的影响,提高信道估计精度。在采用QPSK调制的一发四收的接收分集OFDM系统中,该增强型的信道估计方法的性能明显好于最小二乘信道估计和基于DFT的信道估计。
The characteristics of high speed wireless data transmission in antenna diversity OFDM system are studied. An enhanced channel estimation method is proposed by calculating the correlation function between channel impulse response and reference signal. Theoretical analysis and computer simulation show that this method can effectively reduce the influence of additive noise on channel estimation and improve the channel estimation accuracy. The performance of the enhanced channel estimation method is significantly better than the least-squares channel estimation and DFT-based channel estimation in a one-to-four receive diversity OFDM system employing QPSK modulation.