LoS MIMO in Full Outdoor Microwave Radio

Starting from a basic 1+0 unprotected system, frequently adopted in mobile network tails with low capacity traffic, the “first level” upgrade is historically represented by the Hot-Stand-By (1+1) configuration: in this case, the 1+0 link is protected against failure by a second transceiver that is normally powered on but with the transmit signal switched off. In case of failure of the main link, the protecting one is able to operate in less than one second, typically. Two transceivers per site are necessary with two antennas, or more commonly with one single antenna connected through a passive hybrid, balanced or unbalanced. This last case allows for a low system gain loss when the main RT is in operation, requiring a “revertive” behavior after failure removing.