New radio can transmit and receive on same frequency simultaneously

MIT Technology Review : When radio communication systems were first developed, it was found that if a device used the same frequency for transmission and reception, the signal going out would overwhelm the signal coming in. One solution was simply to transmit and receive on separate frequencies, but that takes up twice the frequency spectrum. Another solution has been to rapidly alternate between transmitting and receiving on the same frequency, but that reduces the device’s efficiency. Now a new startup spun out of Stanford University, Kumu Networks, may have created the first device that can effectively transmit and receive on the same frequency. Kumu’s circuit uses an algorithm to predict the interference the transmitter will create, and then it transmits a second signal to cancel out the interference, which allows for unhindered reception. The technology could double current wireless capacity.