空间分集
空间分集（英语：space diversity）也叫天线分集（英语：antenna diversity），是一种在发射端或（和）接收端安装多根不同位置的天线的分集技术。若这些天线的距离足够大，则电磁波受到衰落的影响就相互独立。
一个详细的空间分集的分集改善系数计算公式：
![I_{sd} =[1-exp(-3.34 \times 10^{-4} \times S^{0.87} \times f^{-0.12} \times d^{0.48} \times (\frac{P_t}{100})^{-1.04})] \times 10^{\frac{F-V}{10}}](/uploads/202412/21/5d1028d0f6f4fbdde5af1a0d04c440813136.png)
其中 
为站距（km），
为无分集时衰落深度（dB），
为工作频率（GHz），
，
和 
为两个空间分集天线的增益（dB），
为衰落因子，
为分集接收天线间的垂直距离（m）。
Antenna diversity
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英语百科
Antenna diversity 空间分集
Antenna diversity, also known as space diversity or spatial diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link. Often, especially in urban and indoor environments, there is no clear line-of-sight (LOS) between transmitter and receiver. Instead the signal is reflected along multiple paths before finally being received. Each of these bounces can introduce phase shifts, time delays, attenuations, and distortions that can destructively interfere with one another at the aperture of the receiving antenna.
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