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提出了一种应用在正交频分复用多天线系统的时域导频方案.该方案能获得较高精度的均方估计性能,导频与有用数据无干扰,且计算复杂度低,多天线场景下,信道估计的性能不受传输天线个数的影响.相比最小二乘估计,该方案只需要对接收信号进行简单的线性相关运算,配合特定的系统参数,能获得较大的信噪比增益;相比线性最小均方误差估计,其仅利用了信道长度信息,性能渐近最优,能获得估计性能与复杂度的折中.
A time-domain pilot scheme for OFDM system is proposed, which can obtain the mean-square estimation performance with high accuracy. The pilot and the useful data have no interference, and the computational complexity is low. In the case of antenna, the performance of channel estimation is not influenced by the number of transmitting antennas.Compared with least square estimation, this scheme only needs to perform simple linear correlation operation on the received signal, and can obtain larger signal with specific system parameters Compared with linear minimum mean square error estimation, it only uses the information of channel length, the performance is asymptotically optimal, and the compromise between estimated performance and complexity can be obtained.