Addressing the 4G and 5G backhaul capacity challenge with Air Division Duplexing

Achieving sufficient capacity to meet the forecast backhaul needs over the next few years will be a major challenge. This white paper describes the technique of Air Division Duplexing (ADD), which makes use of MIMO and spatial multiplexing techniques to achieve simultaneous transmission and reception of data on each carrier frequency, and has been shown to achieve full duplex data rates1 in excess of 1 Gb/s in a 28 MHz channel allocation in the microwave bands.