摘要
根据不同发射天线发射的导频移位后应相互正交的原则,运用最小二乘推导出了基于MIMO-OFDM信道估计模型的时域信道估计解。针对该时域信道估计解需要矩阵求逆,运算量大的缺点,研究了基于空时频三维导频符号的设计方法,该方法使得时域信道估计解不需要矩阵求逆,可大大降低信道估计的复杂度,并且可以使信道估计误差最小。仿真结果表明,提出的基于空时频导频的信道估计方法相比传统LS算法和文献算法,MSE和BER性能均有较大的提高。
With regard to the principle that the pilot frequencies transmitted by different transmitting antennas must be orthogonal after being shifted, the time domain channel estimation solution based on the MIMO-OFDM channel estimation model is deduced through Least Square （LS） method. Considering that the time-domain solution involves the inverse operation of matrix, and needs massive amount of calculation, we adopt a three- dimensional pilot frequency based on space domain, time domain and frequency domain, which can reduce the complexity of channel estimation and make the channel estimation error minimum. Simulation result showed that：Compared with the traditional LS algorithm and the document algorithm, the proposed channel estimation method based on space/time/frequency domain pilot frequency has better MSE and BER performances.
出处
《电光与控制》
北大核心
2015年第2期55-58,72,共5页
Electronics Optics & Control
基金
国家自然科学基金(61102120)
