There is rising interest in full duplex technology – which allows radios to transmit and receive simultaneously in the same frequency – to boost spectral efficiency for 5G backhaul and access networks. It effectively doubles spectral efficiency, by using self-interference cancellation (SIC) to reduce the noise of simultaneous transmission. Kumu has attained the highest profile among the start-ups, but others are attracting funds, including GenXComm, which has just closed a Series A round led by FAM Capital Partners, with investments from the UT Horizon Fund and other investors. GenXComm has developed simultaneous self-interference cancellation (S-SIX) technology, which combines full duplex technology, with the ability to allow channels to be stacked next to each other, with no empty spectrum between them.…