Millimeter wave start-up PHAZR has petitioned the FCC for an experimental licence to test its Quadplex technology, which pairs mmWave frequencies on the downlink with sub-6 GHz spectrum for the uplink, something that is supported in the 5G New Radio standards. The company plans to use the 3.5 GHz, 24 GHz, 28 GHz and 39 GHz bands for tests at its facilities in Allen, Texas, over the course of the next two years. PHAZR, which was initially backed by Fibertower, now owned by AT&T, says it is seeing increasing interest in this hybrid approach. CEO Farooq Khan says that implementing the uplink on mmWave is cost-prohibitive because the links need to be close together and will be about 10 times more…