Dynamic single-frequency networks
Dynamic single-frequency networks (DSFN) is a technique of using several transmitter antennas to transfer the same signal (macrodiversity) in orthogonal frequency-division multiplexing cellular networks. DSFN is based on the idea of single frequency networks, which is a group of radio transmitters that send the same signal simultaneously over the same frequency.
Source: Wikipedia — Dynamic single-frequency networks (CC BY-SA 4.0)