The finite difference depth migration equation in space-frequency domain 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。

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The MIMO-OFDM channel estimation method is researched based on the system design, and a space-frequency domain 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。

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The utilization rate of licensed spectrum is very low in the time domain, frequency domain and space domain, while the unlicensed band is overcrowded seriously.

大部分授权频段在时域、频域和空间域的利用率很低，而公共频段出现了严重的频谱拥挤。

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