The finite difference depth migration equation in space-frequencydomain can be derived when the radical expression is approximated by continued fraction.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
2
The MIMO-OFDM channel estimation method is researched based on the system design, and a space-frequencydomain optimal pilot-tones design algorithm is presented.
从系统设计角度研究了MIMO-OFDM系统的信道估计方法，提出一种基于空频域的最优导频设计算法。
3
The utilization rate of licensed spectrum is very low in the time domain, frequencydomain and space domain, while the unlicensed band is overcrowded seriously.