Each such “bounce” can introduce phase shis, me delays, aenuaons, and even distorons that can
destrucvely interfere with one another at the aperture of the receiving antenna. Antenna diversity is
especially eecve at migang these mul‐path situaons.
This is because mulple antennas aord a receiver several recordings of the same signal. Each antenna will
be exposed to a dierent interference environment. Thus, if one antenna is undergoing a deep fade, it is
likely that another has a sucient signal. Collecvely such a system can provide a robust link.
Antenna diversity requires antenna separaon which is possible by using a dual‐polarizaon antenna or by
two spaally separated antennas.
Use Diversity instead of Spaal Mulplexing in the following situaons:
• When the system cannot operate in Spaal Mulplexing Mode
• When one of the receivers has high interference compared to the second receiver (i.e. the system is
“unbalanced”)
• When you achieve higher capacity in Diversity Mode than in Spaal Mulplexing Mode
• When high robustness is of importance and the capacity of Diversity Mode is sucient (up to 25 Mbps
full duplex)
B.3.2 Single Antennas at Both Sites
By selecng a single antenna at the HBS and SU, the ODUs operate with a single radio that is connected to
the ANT 1 connector. The second radio is automacally shut down.
B.3.3 Single at One Site, Dual Antennas at the Other
In this mode one of the sites uses the ODU with a single antenna while the other site uses the ODU with a
dual antenna.
The advantages in this mode in comparison to using a single antenna in both sites are doubled total Tx
Power and addional polarizaon and/or space diversity (depending on the polarizaon of installed
antennas).
The air rates used in this mode are same as when using single antennas in both sites. Table 8 summarizes
the situaon: (SM =Spaal Mulplexing)
Table 8: Spaal Mulplexing ‐ Diversity sengs
To Next Page
Loading...
Need help?
General
