Two start-ups which have been promising fundamentally new approaches to network performance have announced progress on their designs. Five-year-old Kumu Networks has announced a chip to support its implementation of full-duplex technology, which allows a radio to transmit and receive signals on the same frequency at the same time, doubling capacity. And Artemis Networks is targeting 600 MHz white spaces to drive its pCell, which claims to boost spectral efficiency by creating a personal cell of coverage around a user, dynamically and on-demand. Kumu’s chip is still in the early design phase and is expected to tape out at the end of this year. It could help the company convince the market that full-duplex – which is also being pursued…