A startup spun out of Stanford says it has solved an age-old problem in radio communications with a new circuit and algorithm that allow data to be sent and received on the same radio frequency—thus doubling wireless capacity, at least in theory.

The company, Kumu Networks, has demonstrated the feat in a prototype and says it has agreed to run trials of the technology with unspecified major wireless carriers early next year.

The underlying technology, known as full-duplex radio, tackles a problem known as “self-interference.” As radios send and receive signals, the ones they send are billions of times stronger than the ones they receive. Any attempt to receive data on any given frequency is thwarted by the fact that the radio’s receiver is also picking up its own outgoing signal.