Spatial separation is required in a MIMO configuration.
few quesitons people ask most are:
- Does antennas have be vertical seperation?
Answer: The separation can be either Vertical or Horizontal.
- How far the two antennas need to be separated?
Answer:
Spatial separation between antennas is denoted h1 and h2 respectively (in meters). To achieve the optimal perfomrance, the h1 and h2 shall meet following formula:
where D - overall link distance in meters
c - speed of light (300,000,000 meter/sec)
f - link frequency in Hz
- Do we need have same antenna separation in both side of the link?
Answer: From the formula, we know it is not necessary. Customer can have different antenna separateion on each side.
- What if the optical antenna seperation can not be achieved, how it impacts the MIMO perfomrance?
Answer: Following chart shows how sub-optimal antenna separation affects the capacity relative to an optimal installation.
